:root {
    --ink: #08090c;
    --ink-soft: #11141a;
    --paper: #f7f4ec;
    --paper-soft: #e8e1d4;
    --line: rgba(255, 255, 255, 0.16);
    --line-dark: rgba(8, 9, 12, 0.14);
    --muted: rgba(247, 244, 236, 0.72);
    --muted-dark: #626761;
    --cyan: #48d8ff;
    --lime: #a7ef5c;
    --rose: #ff5d7d;
    --amber: #f0b84a;
    --max: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--paper);
    background: var(--ink);
    font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    line-height: 1.6;
    letter-spacing: 0;
}

img,
video {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
}

.skip-link {
    position: fixed;
    left: 1rem;
    top: -4rem;
    z-index: 100;
    padding: 0.7rem 1rem;
    color: var(--ink);
    background: var(--lime);
    border-radius: 4px;
}

.skip-link:focus {
    top: 1rem;
}

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem max(1.25rem, calc((100vw - var(--max)) / 2));
    color: var(--paper);
    background: rgba(8, 9, 12, 0.42);
    border-bottom: 1px solid transparent;
    backdrop-filter: blur(18px);
    transition: background 180ms ease, border-color 180ms ease;
}

.site-header.is-scrolled {
    background: rgba(8, 9, 12, 0.9);
    border-color: var(--line);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 1.05rem;
    min-width: 0;
}

.brand-mark {
    width: 6.8rem;
    height: 4.7rem;
    object-fit: contain;
    flex: 0 0 auto;
    filter: invert(1);
}

.brand-name {
    font-size: 1.38rem;
    line-height: 1;
    font-weight: 900;
    white-space: nowrap;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1.35rem;
    font-size: 0.94rem;
    color: rgba(247, 244, 236, 0.86);
}

.site-nav a {
    padding: 0.3rem 0;
    border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    color: var(--paper);
    border-color: var(--lime);
}

.nav-toggle {
    display: none;
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--line);
    border-radius: 4px;
    color: var(--paper);
    background: rgba(255, 255, 255, 0.04);
}

.nav-toggle span {
    display: block;
    width: 1.15rem;
    height: 1px;
    margin: 0.32rem auto;
    background: currentColor;
}

.hero {
    position: relative;
    min-height: 82vh;
    display: grid;
    align-items: end;
    overflow: hidden;
    isolation: isolate;
    padding: 8.5rem max(1.25rem, calc((100vw - var(--max)) / 2)) 5.5rem;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -3;
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.54), rgba(8, 9, 12, 0.26)),
        url("../../pics/classroom-002-coding-workshop.png") center / cover no-repeat;
    transform: scale(1.02);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: -2;
    background:
        linear-gradient(180deg, rgba(8, 9, 12, 0.46), rgba(8, 9, 12, 0.12) 42%, rgba(8, 9, 12, 0.86)),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 96px);
}

.hero-content {
    max-width: 780px;
}

.eyebrow,
.section-kicker {
    margin: 0 0 0.8rem;
    color: var(--lime);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    max-width: 9ch;
    font-size: 4.75rem;
    line-height: 0.96;
    font-weight: 900;
}

.hero-copy {
    max-width: 720px;
    margin: 1.35rem 0 0;
    color: rgba(247, 244, 236, 0.86);
    font-size: 1.18rem;
}

.hero-actions,
.footer-links,
.contact-channels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.hero-actions {
    margin-top: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    min-height: 2.9rem;
    padding: 0.78rem 1.05rem;
    border: 1px solid transparent;
    border-radius: 4px;
    font-weight: 800;
    line-height: 1.2;
    cursor: pointer;
    transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.btn svg,
.contact-channels svg {
    width: 1.05rem;
    height: 1.05rem;
    flex: 0 0 auto;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-1px);
}

.btn-primary {
    color: var(--ink);
    background: var(--lime);
    border-color: var(--lime);
}

.btn-secondary {
    color: var(--paper);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.24);
}

.hero-strip {
    position: absolute;
    left: max(1.25rem, calc((100vw - var(--max)) / 2));
    right: max(1.25rem, calc((100vw - var(--max)) / 2));
    bottom: 1.25rem;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
    background: rgba(8, 9, 12, 0.38);
    backdrop-filter: blur(14px);
}

.hero-strip span {
    min-height: 3rem;
    display: grid;
    place-items: center;
    padding: 0.5rem;
    border-right: 1px solid var(--line);
    font-size: 0.82rem;
    color: rgba(247, 244, 236, 0.84);
    text-align: center;
}

.section {
    padding: 6rem max(1.25rem, calc((100vw - var(--max)) / 2));
}

.section-inner {
    max-width: var(--max);
    margin: 0 auto;
}

.intro-band,
.trust-band {
    color: var(--ink);
    background: var(--paper);
}

.intro-grid,
.stack-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 4rem;
    align-items: start;
}

.intro-grid h2,
.section-heading h2,
.method-copy h2,
.stack-grid h2,
.contact-copy h2 {
    margin: 0;
    font-size: 2.35rem;
    line-height: 1.15;
}

.intro-copy {
    color: #353832;
    font-size: 1.05rem;
}

.intro-copy p,
.stack-list p {
    margin: 0 0 1rem;
}

.section-heading {
    display: grid;
    grid-template-columns: minmax(0, 0.74fr) minmax(16rem, 0.26fr);
    align-items: end;
    gap: 2rem;
    margin-bottom: 2rem;
}

.programs {
    background: #0c0f14;
}

.program-grid {
    display: grid;
    gap: 1rem;
}

.program-card {
    display: grid;
    grid-template-columns: minmax(18rem, 0.92fr) minmax(0, 1.08fr);
    min-height: 26rem;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.program-media {
    min-height: 24rem;
}

.program-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.program-body {
    padding: 2rem;
}

.program-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    color: var(--muted);
    font-size: 0.82rem;
    text-transform: uppercase;
}

.program-topline span {
    color: var(--cyan);
    font-weight: 900;
}

.program-body h3 {
    margin: 1rem 0 0.8rem;
    font-size: 2rem;
    line-height: 1.18;
}

.program-body p {
    margin: 0;
    color: var(--muted);
}

.program-body ul {
    display: grid;
    gap: 0.7rem;
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

.program-body li {
    position: relative;
    padding-left: 1.1rem;
    color: rgba(247, 244, 236, 0.82);
}

.program-body li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 0.42rem;
    height: 0.42rem;
    background: var(--lime);
}

.method-band {
    background: #15120f;
}

.method-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: 3rem;
}

.method-copy p:last-child {
    color: var(--muted);
    font-size: 1.05rem;
}

.method-steps {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.method-steps article {
    min-height: 13rem;
    padding: 1.4rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.method-steps span {
    display: inline-grid;
    place-items: center;
    width: 2.1rem;
    height: 2.1rem;
    margin-bottom: 1.4rem;
    color: var(--ink);
    background: var(--amber);
    border-radius: 4px;
    font-weight: 900;
}

.method-steps h3,
.video-card h3 {
    margin: 0 0 0.55rem;
    font-size: 1.2rem;
}

.method-steps p,
.video-card p {
    margin: 0;
    color: var(--muted);
}

.project-gallery {
    color: var(--ink);
    background: #f1eee5;
}

.project-gallery .section-kicker,
.intro-band .section-kicker,
.trust-band .section-kicker {
    color: #2f6a46;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.gallery-grid figure {
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: white;
}

.gallery-grid img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.gallery-grid figcaption {
    min-height: 3.4rem;
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    color: #242620;
    font-weight: 800;
}

.video-band {
    background: #090a0d;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.video-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #11141a;
}

.video-card video {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: #000;
}

.video-card h3 {
    padding: 1rem;
}

.stack-list {
    color: #353832;
    font-size: 1.04rem;
}

.contact-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.76)),
        url("../../pics/roblox-010-lua-course-logo.png") center / cover no-repeat;
}

.contact-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.84fr) minmax(20rem, 1fr);
    gap: 3rem;
    align-items: start;
}

.contact-copy p {
    color: var(--muted);
    font-size: 1.05rem;
}

.contact-channels {
    margin-top: 1.5rem;
}

.contact-channels a,
.contact-channels span {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(247, 244, 236, 0.86);
}

.lead-form {
    display: grid;
    gap: 1rem;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(8, 9, 12, 0.74);
    backdrop-filter: blur(18px);
}

.form-row {
    display: grid;
    gap: 0.42rem;
}

.two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
    color: rgba(247, 244, 236, 0.82);
    font-size: 0.88rem;
    font-weight: 800;
}

input,
select,
textarea {
    width: 100%;
    min-height: 2.9rem;
    color: var(--paper);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    padding: 0.72rem 0.8rem;
    outline: none;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--lime);
}

select option {
    color: var(--ink);
}

.honeypot {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
}

.consent {
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
    color: var(--muted);
    font-weight: 500;
}

.consent input {
    width: 1rem;
    min-height: 1rem;
    margin-top: 0.28rem;
    accent-color: var(--lime);
}

.form-submit {
    width: 100%;
}

.form-status {
    min-height: 1.5rem;
    margin: 0;
    color: var(--lime);
}

.form-status.is-error {
    color: var(--rose);
}

.site-footer {
    padding: 2.2rem max(1.25rem, calc((100vw - var(--max)) / 2));
    color: rgba(247, 244, 236, 0.74);
    background: #06070a;
    border-top: 1px solid var(--line);
}

.footer-inner {
    max-width: var(--max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 2rem;
    align-items: center;
}

.footer-logo {
    width: 5.4rem;
    height: auto;
    filter: invert(1);
}

.footer-inner p {
    margin: 0.35rem 0 0;
}

.footer-links {
    justify-content: center;
}

.footer-links a:hover {
    color: var(--paper);
}

.copyright {
    text-align: right;
}

.lesson-page :not(pre) > code {
    padding: 0.08rem 0.32rem;
    color: var(--cyan);
    background: rgba(72, 216, 255, 0.11);
    border: 1px solid rgba(72, 216, 255, 0.18);
    border-radius: 4px;
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
    font-size: 0.94em;
}

.lesson-page pre {
    margin: 0;
    overflow: auto;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    background: #07090d;
}

.lesson-page pre code {
    display: block;
    min-width: max-content;
    padding: 1rem;
    color: rgba(247, 244, 236, 0.92);
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
    font-size: 0.9rem;
    line-height: 1.58;
}

.cookie-consent {
    position: fixed;
    right: max(1rem, calc((100vw - var(--max)) / 2));
    bottom: 1rem;
    left: auto;
    z-index: 90;
    display: none;
    width: min(27rem, calc(100vw - 2rem));
    color: var(--ink);
}

.cookie-consent.is-visible {
    display: block;
}

.cookie-card {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.85rem;
    padding: 1rem;
    background: rgba(255, 250, 239, 0.98);
    border: 1px solid rgba(8, 9, 12, 0.14);
    border-radius: 8px;
    box-shadow: 0 1.1rem 2.6rem rgba(8, 9, 12, 0.2);
    backdrop-filter: blur(14px);
}

.cookie-card .section-kicker {
    margin-bottom: 0.2rem;
    color: #0f7a55;
}

.cookie-copy h2 {
    margin: 0 0 0.45rem;
    font-size: 1.32rem;
    line-height: 1.22;
}

.cookie-copy p {
    margin: 0;
    color: #4d514b;
    font-size: 0.94rem;
    line-height: 1.58;
}

.cookie-copy a {
    display: inline-flex;
    margin-top: 0.65rem;
    color: #0f7a55;
    font-weight: 800;
    border-bottom: 1px solid rgba(15, 122, 85, 0.42);
}

.cookie-options {
    display: grid;
    gap: 0.45rem;
}

.cookie-option {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.65rem;
    align-items: flex-start;
    padding: 0.62rem;
    background: rgba(8, 9, 12, 0.035);
    border: 1px solid rgba(8, 9, 12, 0.11);
    border-radius: 6px;
}

.cookie-option input {
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.18rem;
    accent-color: var(--lime);
}

.cookie-option strong,
.cookie-option small {
    display: block;
}

.cookie-option strong {
    font-size: 0.95rem;
}

.cookie-option small {
    margin-top: 0.16rem;
    color: #676c64;
    line-height: 1.45;
}

.cookie-option.is-required {
    background: rgba(72, 216, 255, 0.12);
    border-color: rgba(22, 125, 157, 0.24);
}

.cookie-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.45rem;
}

.cookie-button,
.cookie-settings-button {
    min-height: 2.55rem;
    padding: 0.62rem 0.72rem;
    color: var(--ink);
    font-weight: 900;
    font-size: 0.9rem;
    border: 1px solid rgba(8, 9, 12, 0.18);
    border-radius: 6px;
    background: rgba(8, 9, 12, 0.055);
    cursor: pointer;
}

.cookie-button:hover,
.cookie-button:focus-visible,
.cookie-settings-button:hover,
.cookie-settings-button:focus-visible {
    border-color: var(--lime);
    outline: none;
}

.cookie-button.primary {
    color: var(--ink);
    background: var(--lime);
    border-color: var(--lime);
}

.cookie-button.secondary {
    color: var(--ink);
    background: var(--amber);
    border-color: var(--amber);
}

.cookie-button.ghost {
    background: rgba(8, 9, 12, 0.08);
}

.cookie-settings-button {
    position: fixed;
    right: max(1rem, calc((100vw - var(--max)) / 2));
    bottom: 1rem;
    z-index: 89;
    display: none;
    color: var(--ink);
    background: var(--paper);
    border-color: rgba(8, 9, 12, 0.22);
    box-shadow: 0 0.8rem 2rem rgba(0, 0, 0, 0.24);
}

.cookie-settings-button.is-visible {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.privacy-main {
    padding-top: 7.5rem;
    background:
        radial-gradient(circle at 15% 0%, rgba(167, 239, 92, 0.1), transparent 32rem),
        var(--ink);
}

.privacy-shell {
    width: min(var(--max), calc(100vw - 2.5rem));
    margin: 0 auto;
    padding: 3rem 0 5rem;
}

.privacy-hero {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(16rem, 0.55fr);
    gap: 2rem;
    align-items: end;
    margin-bottom: 2rem;
}

.privacy-hero h1 {
    margin: 0.2rem 0 1rem;
    font-size: clamp(2.6rem, 6vw, 5.8rem);
    line-height: 0.95;
}

.privacy-hero p,
.privacy-panel p,
.privacy-panel li {
    color: rgba(247, 244, 236, 0.74);
}

.privacy-badge {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 8px;
}

.privacy-badge strong,
.privacy-badge span {
    display: block;
}

.privacy-badge span {
    margin-top: 0.3rem;
    color: var(--muted);
}

.privacy-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.privacy-panel {
    padding: 1.2rem;
    background: rgba(255, 255, 255, 0.055);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
}

.privacy-panel.wide {
    grid-column: 1 / -1;
}

.privacy-panel h2 {
    margin: 0 0 0.7rem;
    font-size: 1.35rem;
}

.privacy-panel p,
.privacy-panel ul {
    margin: 0;
}

.privacy-panel ul {
    padding-left: 1.2rem;
}

.privacy-panel li + li {
    margin-top: 0.45rem;
}

.lesson-hero {
    position: relative;
    min-height: 82vh;
    display: grid;
    align-items: end;
    overflow: hidden;
    isolation: isolate;
    padding: 8.5rem max(1.25rem, calc((100vw - var(--max)) / 2)) 5.5rem;
}

.lesson-hero-bg {
    position: absolute;
    inset: 0;
    z-index: -3;
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-pointer-003-pointer-address.png") center / cover no-repeat;
    transform: scale(1.02);
}

.lesson-hero-content {
    max-width: 790px;
}

.lesson-hero h1 {
    margin: 0;
    max-width: 9ch;
    font-size: 4.6rem;
    line-height: 0.96;
    font-weight: 900;
}

.lesson-strip span {
    min-width: 0;
}

.lesson-two-col,
.lesson-split,
.code-showcase,
.mnemonic-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3rem;
    align-items: center;
}

.lesson-two-col h2,
.lesson-copy h2,
.flow-section h2,
.modify-section h2,
.coins-section h2,
.mnemonic-layout h2,
.summary-panel h2,
.practice-section h2,
.mistake-section h2 {
    margin: 0;
    font-size: 2.35rem;
    line-height: 1.15;
}

.lesson-intro,
.modify-section,
.practice-section {
    color: var(--ink);
    background: var(--paper);
}

.lesson-intro .section-kicker,
.modify-section .section-kicker,
.practice-section .section-kicker {
    color: #2f6a46;
}

.lesson-intro p,
.modify-section p {
    color: #353832;
    font-size: 1.05rem;
}

.lesson-intro :not(pre) > code,
.modify-section :not(pre) > code,
.practice-section :not(pre) > code {
    color: #006a84;
    background: #e3f8fb;
    border-color: #a9dfe8;
}

.lesson-intro .level-table,
.modify-section .level-table,
.practice-section .level-table {
    color: var(--ink);
}

.lesson-intro .level-table span,
.modify-section .level-table span,
.practice-section .level-table span {
    color: #28342f;
}

.lesson-intro pre {
    max-width: 18rem;
    margin: 1.4rem 0;
}

.memory-board {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    max-width: 34rem;
    margin-top: 1.4rem;
}

.memory-box,
.memory-address {
    min-height: 8rem;
    display: grid;
    align-content: center;
    gap: 0.35rem;
    padding: 1rem;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #fff;
}

.memory-box strong,
.memory-address strong {
    font-size: 2.2rem;
    line-height: 1;
}

.memory-label,
.memory-address span {
    color: var(--muted-dark);
    font-size: 0.82rem;
    font-weight: 800;
}

.value-box {
    color: var(--ink);
    background: #dff6c7;
}

.memory-address {
    grid-column: 1 / -1;
    color: var(--paper);
    background: var(--ink-soft);
}

.memory-address strong {
    color: var(--cyan);
    font-size: 1.6rem;
}

.lesson-figure {
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.lesson-figure img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.lesson-figure figcaption {
    min-height: 3.5rem;
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    color: rgba(247, 244, 236, 0.84);
    font-weight: 800;
}

.lesson-inline-figure,
.lesson-wide-figure {
    margin: 1.4rem 0 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.lesson-inline-figure img,
.lesson-wide-figure img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.lesson-intro .lesson-inline-figure,
.modify-section .lesson-inline-figure,
.practice-section .lesson-inline-figure {
    border-color: var(--line-dark);
}

.lesson-wide-figure {
    margin-bottom: 1rem;
}

.lesson-code-band,
.pointer-basics,
.coins-section {
    background: #0c0f14;
}

.lesson-copy p {
    color: var(--muted);
    font-size: 1.05rem;
}

.code-panel {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.code-panel-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    min-height: 3.2rem;
    padding: 0.8rem 1rem;
    color: rgba(247, 244, 236, 0.88);
    border-bottom: 1px solid var(--line);
    font-weight: 900;
}

.code-panel-title svg {
    width: 1.05rem;
    height: 1.05rem;
    color: var(--lime);
}

.terminal-output {
    display: grid;
    gap: 0.3rem;
    padding: 0.95rem 1rem;
    color: #bdfc7a;
    background: #050609;
    border-top: 1px solid var(--line);
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
    font-size: 0.92rem;
}

.terminal-output span::before {
    content: "> ";
    color: rgba(247, 244, 236, 0.42);
}

.pointer-grid,
.practice-grid,
.mistake-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.pointer-card,
.practice-card,
.mistake-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.pointer-card {
    min-height: 14rem;
    padding: 1.3rem;
}

.pointer-card svg,
.mistake-card svg,
.flow-note svg {
    width: 1.35rem;
    height: 1.35rem;
    color: var(--lime);
}

.pointer-card h3 {
    margin: 1.1rem 0 0.7rem;
    font-size: 1.25rem;
}

.pointer-card p {
    margin: 0;
    color: var(--muted);
}

.code-showcase {
    margin-top: 1rem;
}

.flow-section,
.mnemonic-section,
.mistake-section {
    background: #15120f;
}

.pointer-flow {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1.2rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.pointer-flow li {
    position: relative;
    min-height: 12rem;
    display: grid;
    align-content: start;
    gap: 0.6rem;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.pointer-flow li:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -1.25rem;
    width: 1.25rem;
    height: 2px;
    background: var(--lime);
}

.pointer-flow li:not(:last-child)::before {
    content: "";
    position: absolute;
    top: calc(50% - 0.27rem);
    right: -1.32rem;
    width: 0.52rem;
    height: 0.52rem;
    border-top: 2px solid var(--lime);
    border-right: 2px solid var(--lime);
    transform: rotate(45deg);
}

.pointer-flow span {
    width: fit-content;
    padding: 0.22rem 0.5rem;
    color: var(--ink);
    background: var(--amber);
    border-radius: 4px;
    font-size: 0.76rem;
    font-weight: 900;
}

.pointer-flow strong {
    font-size: 1.08rem;
    line-height: 1.25;
}

.pointer-flow code {
    width: fit-content;
}

.flow-note {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
    margin-top: 1.4rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.flow-note p {
    margin: 0;
    color: var(--muted);
}

.compare-table {
    display: grid;
    max-width: 26rem;
    margin-top: 1.5rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
}

.compare-table div {
    display: grid;
    grid-template-columns: 0.75fr 1fr;
}

.compare-table div + div {
    border-top: 1px solid var(--line);
}

.compare-table strong,
.compare-table span {
    padding: 0.9rem 1rem;
}

.compare-table strong {
    background: rgba(255, 255, 255, 0.05);
}

.compare-table span {
    color: var(--muted);
}

.score-change {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.8rem;
    align-items: center;
    margin-top: 1.5rem;
}

.score-change div {
    min-height: 7rem;
    display: grid;
    align-content: center;
    gap: 0.35rem;
    padding: 1rem;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #fff;
}

.score-change div:last-child {
    background: #dff6c7;
}

.score-change span {
    color: var(--muted-dark);
    font-size: 0.82rem;
    font-weight: 800;
}

.score-change strong {
    font-size: 1.45rem;
    line-height: 1.15;
}

.score-change svg {
    width: 1.4rem;
    height: 1.4rem;
    color: #2f6a46;
}

.mnemonic-layout {
    align-items: start;
}

.mnemonic-grid {
    display: grid;
    grid-template-columns: 0.8fr 0.8fr 1.4fr;
    gap: 1rem;
}

.mnemonic-grid article {
    min-height: 12rem;
    display: grid;
    align-content: center;
    gap: 0.7rem;
    padding: 1.4rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.mnemonic-grid strong {
    color: var(--lime);
    font-size: 4rem;
    line-height: 1;
}

.mnemonic-grid span {
    color: rgba(247, 244, 236, 0.86);
    font-size: 1.05rem;
    font-weight: 800;
}

.mnemonic-grid code {
    width: fit-content;
    font-size: 1.1rem;
}

.practice-card {
    display: grid;
    gap: 1rem;
    padding: 1.2rem;
    color: var(--paper);
}

.practice-card:first-child {
    grid-column: span 1;
}

.practice-card:last-child {
    grid-column: span 2;
}

.practice-card > span {
    width: fit-content;
    padding: 0.22rem 0.5rem;
    color: var(--ink);
    background: var(--lime);
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 900;
}

.practice-card h3,
.mistake-card h3 {
    margin: 0;
    font-size: 1.16rem;
    line-height: 1.28;
}

.answer-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--ink);
    background: #dff6c7;
    border-radius: 8px;
    font-weight: 900;
}

.mistake-card {
    display: grid;
    align-content: start;
    gap: 1rem;
    padding: 1.2rem;
}

.mistake-card.is-danger svg {
    color: var(--rose);
}

.mistake-card p {
    margin: 0;
    color: var(--muted);
}

.summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-pointer-004-dereference-value.png") center / cover no-repeat;
}

.summary-panel {
    max-width: 880px;
    padding: 2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(8, 9, 12, 0.74);
    backdrop-filter: blur(18px);
}

.summary-lines {
    display: grid;
    gap: 0.7rem;
    margin: 1.5rem 0;
}

.summary-lines code {
    width: fit-content;
    font-size: 1.08rem;
}

.summary-meaning {
    display: grid;
    gap: 0.7rem;
    margin-bottom: 1.6rem;
}

.summary-meaning p {
    margin: 0;
    color: var(--muted);
}

.cpp-pointer-mid-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-pointer-mid-001-function-addone.png") center / cover no-repeat;
}

.cpp-pointer-mid-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-pointer-mid-008-double-pointer.png") center / cover no-repeat;
}

.cpp-pointer-adv-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-pointer-adv-001-memory-map.png") center / cover no-repeat;
}

.cpp-pointer-adv-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-pointer-adv-010-object-pointer-modern.png") center / cover no-repeat;
}

.cpp-oop-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-oop-001-class-object-map.svg") center / cover no-repeat;
}

.cpp-oop-page .lesson-hero h1 {
    max-width: min(100%, 13em);
}

.cpp-oop-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-oop-002-oop-mindmap.svg") center / cover no-repeat;
}

.cpp-oop-inherit-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-oop-inherit-001-family-map.svg") center / cover no-repeat;
}

.cpp-oop-inherit-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-oop-inherit-002-mindmap.svg") center / cover no-repeat;
}

.cpp-oop-poly-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-oop-poly-001-virtual-dispatch.svg") center / cover no-repeat;
}

.cpp-oop-poly-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-oop-poly-002-mindmap.svg") center / cover no-repeat;
}

.cpp-oop-project-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-oop-project-001-rpg-system.svg") center / cover no-repeat;
}

.cpp-oop-project-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-oop-project-002-mindmap.svg") center / cover no-repeat;
}

.cpp-oop-page .lesson-figure img,
.cpp-oop-page .lesson-inline-figure img,
.cpp-oop-page .lesson-wide-figure img {
    object-fit: contain;
    background: #08090c;
}

.cpp-hub-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.56), rgba(8, 9, 12, 0.24)),
        url("../../pics/c++/cpp-pointer-adv-001-memory-map.png") center / cover no-repeat;
}

.cpp-hub-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.72)),
        url("../../pics/c++/cpp-pointer-mid-004-pointer-arithmetic.png") center / cover no-repeat;
}

.cpp-course-grid {
    display: grid;
    gap: 1rem;
}

.cpp-course-grid .program-body {
    display: grid;
    align-content: start;
}

.cpp-hub-page .cpp-course-grid .program-media img[src*="cpp-oop"] {
    object-fit: contain;
    background: #08090c;
}

.cpp-course-grid .btn {
    width: fit-content;
    margin-top: 1.5rem;
}

.ai-course-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.92), rgba(8, 9, 12, 0.58), rgba(8, 9, 12, 0.18)),
        url("../../pics/ai/ai-001-ai-lab-illustration.svg") center / cover no-repeat;
}

.ai-course-page .lesson-hero h1 {
    max-width: min(100%, 12em);
}

.ai-course-page .summary-section {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.74)),
        url("../../pics/ai/ai-002-ai-learning-mindmap.svg") center / cover no-repeat;
}

.ai-course-page .lesson-figure img,
.ai-course-page .lesson-wide-figure img {
    object-fit: contain;
    background: #08090c;
}

.ai-course-page .lesson-figure figcaption {
    min-height: 4.4rem;
}

.ai-lesson-page .lesson-hero-bg {
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.62), rgba(8, 9, 12, 0.2)),
        var(--ai-lesson-image) center / cover no-repeat;
}

.ai-lesson-page .lesson-hero h1 {
    max-width: min(100%, 13em);
}

.ai-lesson-page .lesson-figure img {
    object-fit: cover;
    background: #08090c;
}

.ai-lesson-link {
    width: fit-content;
}

.ai-phase-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.ai-phase-grid article {
    min-height: 10.5rem;
    display: grid;
    align-content: start;
    gap: 0.55rem;
    padding: 1.05rem;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
}

.ai-phase-grid span {
    width: fit-content;
    padding: 0.24rem 0.55rem;
    color: var(--ink);
    background: var(--lime);
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 900;
}

.ai-phase-grid h3 {
    margin: 0;
    font-size: 1.18rem;
}

.ai-phase-grid p {
    margin: 0;
    color: #353832;
    font-size: 0.96rem;
}

.ai-five-flow {
    margin-top: 1.3rem;
}

.ai-lesson-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.ai-lesson-card {
    min-width: 0;
    display: grid;
    align-content: start;
    gap: 1rem;
    padding: 1.25rem;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
}

.ai-lesson-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.ai-lesson-topline span,
.ai-lesson-topline strong {
    display: inline-flex;
    align-items: center;
    min-height: 2rem;
    padding: 0.24rem 0.6rem;
    border-radius: 4px;
    font-size: 0.82rem;
    line-height: 1;
    font-weight: 900;
}

.ai-lesson-topline span {
    color: var(--ink);
    background: var(--amber);
}

.ai-lesson-topline strong {
    color: var(--paper);
    background: var(--ink-soft);
}

.ai-lesson-art {
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #08090c;
}

.ai-lesson-art img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.ai-lesson-card h3 {
    margin: 0;
    font-size: 1.65rem;
    line-height: 1.18;
}

.ai-lesson-card p {
    margin: 0;
    color: #353832;
}

.ai-learn-box {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.7rem;
    align-items: start;
    padding: 0.9rem;
    border: 1px solid #b9d9ce;
    border-radius: 8px;
    background: #edf8f2;
}

.ai-learn-box svg {
    width: 1.15rem;
    height: 1.15rem;
    margin-top: 0.15rem;
    color: #006a84;
}

.ai-learn-box span {
    color: #18382d;
    font-weight: 800;
}

.ai-lesson-card ul {
    display: grid;
    gap: 0.42rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.ai-lesson-card li {
    position: relative;
    padding-left: 1.05rem;
    color: #353832;
    font-weight: 700;
}

.ai-lesson-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 0.42rem;
    height: 0.42rem;
    border-radius: 50%;
    background: #006a84;
}

.ai-lesson-details {
    overflow: hidden;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #f7f4ec;
}

.ai-lesson-details summary {
    cursor: pointer;
    padding: 0.85rem 1rem;
    color: var(--paper);
    background: var(--ink-soft);
    font-weight: 900;
}

.ai-detail-block {
    display: grid;
    gap: 0.55rem;
    padding: 1rem;
    border-top: 1px solid var(--line-dark);
}

.ai-detail-block h4 {
    margin: 0;
    color: var(--ink);
    font-size: 1rem;
}

.ai-detail-block pre {
    max-height: 24rem;
    margin: 0;
    overflow: auto;
    color: #eaf3ee;
    background: #08090c;
    border: 1px solid rgba(8, 9, 12, 0.22);
    border-radius: 8px;
}

.ai-detail-block code {
    white-space: pre;
}

.ai-rich-block {
    background: #fffaf0;
}

.ai-detail-list {
    display: grid;
    gap: 0.48rem;
    margin: 0;
    padding-left: 1.25rem;
    color: #353832;
}

.ai-detail-list li {
    padding-left: 0.15rem;
    font-weight: 700;
}

.ai-detail-list li::marker {
    color: #006a84;
    font-weight: 900;
}

.ai-output-note {
    padding: 0.85rem;
    border: 1px solid #b9d9ce;
    border-radius: 8px;
    background: #edf8f2;
    color: #18382d;
    font-weight: 800;
}

.ai-concept-grid,
.ai-practice-layout {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.ai-concept-grid article,
.ai-practice-panel {
    min-height: 14rem;
    display: grid;
    align-content: start;
    gap: 0.75rem;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.ai-concept-grid svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--lime);
}

.ai-concept-grid h3,
.ai-practice-panel h3 {
    margin: 0;
    font-size: 1.25rem;
}

.ai-concept-grid p,
.ai-practice-panel p {
    margin: 0;
    color: var(--muted);
}

.ai-practice-layout {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.ai-practice-panel {
    color: var(--ink);
    background: #fff;
    border-color: var(--line-dark);
}

.ai-practice-panel h3 {
    color: var(--ink);
}

.ai-practice-panel p,
.ai-practice-panel li {
    color: #353832;
    font-weight: 700;
}

.ai-practice-panel ul {
    display: grid;
    gap: 0.45rem;
    margin: 0;
    padding-left: 1.2rem;
}

.compact-table {
    max-width: 20rem;
}

.copy-vs-address,
.rule-pair,
.quiz-grid,
.level-table,
.runtime-layers,
.best-grid {
    display: grid;
    gap: 1rem;
}

.runtime-layers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 1rem;
}

.runtime-layers article {
    min-height: 12rem;
    display: grid;
    align-content: start;
    gap: 0.6rem;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.runtime-layers span {
    width: fit-content;
    padding: 0.22rem 0.5rem;
    color: var(--ink);
    background: var(--lime);
    border-radius: 4px;
    font-size: 0.76rem;
    font-weight: 900;
}

.runtime-layers strong {
    color: var(--paper);
    font-size: 1.35rem;
}

.runtime-layers p {
    margin: 0;
    color: var(--muted);
}

.copy-vs-address {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1.5rem;
}

.copy-vs-address article,
.rule-pair article,
.array-equations article,
.nullptr-card {
    display: grid;
    gap: 0.7rem;
    padding: 1.1rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.copy-vs-address span,
.heap-block span,
.nullptr-card span,
.memory-node span {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 800;
}

.copy-vs-address strong,
.heap-block strong,
.nullptr-card strong,
.memory-node strong {
    font-size: 1.35rem;
    line-height: 1.1;
}

.copy-vs-address svg,
.rule-pair svg,
.array-equations svg,
.heap-diagram svg,
.nullptr-card svg {
    width: 1.3rem;
    height: 1.3rem;
    color: var(--lime);
}

.copy-vs-address p {
    margin: 0;
    color: var(--muted);
}

.six-flow {
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.memory-link-diagram,
.heap-diagram,
.double-pointer-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 1rem;
    align-items: center;
}

.memory-link-diagram,
.heap-diagram {
    min-height: 100%;
}

.memory-node,
.heap-block {
    min-height: 13rem;
    display: grid;
    align-content: center;
    gap: 0.55rem;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.memory-node strong,
.heap-block strong {
    color: var(--lime);
    font-size: 3rem;
}

.memory-node em,
.heap-block em {
    color: var(--cyan);
    font-style: normal;
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
}

.pointer-node strong {
    color: var(--cyan);
}

.memory-link-diagram > svg {
    width: 1.6rem;
    height: 1.6rem;
    color: var(--lime);
}

.swap-diagram {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.8rem;
    align-items: center;
    margin-top: 1.5rem;
}

.swap-diagram div {
    min-height: 6.4rem;
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 0.2rem;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #fff;
}

.swap-diagram div:nth-of-type(n+3) {
    background: #dff6c7;
}

.swap-diagram span {
    color: var(--muted-dark);
    font-weight: 900;
}

.swap-diagram strong {
    font-size: 2.2rem;
    line-height: 1;
}

.swap-diagram svg {
    width: 1.35rem;
    height: 1.35rem;
    color: #2f6a46;
}

.array-memory {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.7rem;
    margin-bottom: 1rem;
}

.array-memory div {
    min-height: 8.5rem;
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 0.35rem;
    padding: 0.9rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.array-memory span {
    color: var(--cyan);
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
    font-size: 0.9rem;
}

.array-memory strong {
    color: var(--lime);
    font-size: 2rem;
}

.array-memory em {
    color: var(--muted);
    font-style: normal;
    font-size: 0.82rem;
}

.array-equations {
    display: grid;
    gap: 0.8rem;
}

.array-equations article,
.rule-pair article {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
}

.array-equations code,
.rule-pair code {
    justify-self: start;
}

.mnemonic-layout p {
    color: var(--muted);
    font-size: 1.05rem;
}

.heap-block.active {
    background: rgba(167, 239, 92, 0.12);
}

.heap-diagram > svg {
    width: 1.6rem;
    height: 1.6rem;
    color: var(--lime);
}

.rule-pair {
    margin-top: 1.5rem;
}

.rule-pair article {
    color: var(--paper);
    background: #10151d;
}

.nullptr-card {
    max-width: 22rem;
    margin-top: 1.5rem;
    justify-items: start;
}

.nullptr-card svg {
    color: var(--rose);
}

.readonly-card svg {
    color: var(--lime);
}

.double-pointer-layout {
    grid-template-columns: minmax(16rem, 0.8fr) minmax(0, 1.2fr);
}

.pointer-chain {
    display: grid;
    justify-items: center;
    gap: 0.8rem;
}

.pointer-chain div {
    width: min(100%, 17rem);
    min-height: 6.5rem;
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 0.35rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.pointer-chain span {
    color: var(--muted);
    font-weight: 900;
}

.pointer-chain strong {
    color: var(--lime);
    font-size: 1.6rem;
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
}

.pointer-chain svg {
    width: 1.3rem;
    height: 1.3rem;
    color: var(--lime);
}

.quiz-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.quiz-grid .practice-card {
    grid-column: auto;
}

.best-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.best-grid .pointer-card {
    min-height: 11rem;
}

.best-grid .pointer-card:nth-child(odd) svg {
    color: var(--rose);
}

.best-grid code {
    width: fit-content;
    max-width: 100%;
    overflow-wrap: anywhere;
}

.level-table {
    margin: 1.5rem 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.level-table div {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
}

.level-table div + div {
    border-top: 1px solid var(--line);
}

.level-table strong,
.level-table span {
    padding: 0.85rem 1rem;
}

.level-table strong {
    color: rgba(247, 244, 236, 0.92);
}

.level-table span {
    color: var(--lime);
    background: rgba(255, 255, 255, 0.045);
    font-family: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
}

.lesson-intro .level-table {
    border-color: rgba(47, 106, 70, 0.2);
    background: rgba(255, 255, 255, 0.36);
}

.lesson-intro .level-table div + div {
    border-top-color: rgba(47, 106, 70, 0.16);
}

.lesson-intro .level-table strong {
    color: #173b2a;
    background: rgba(47, 106, 70, 0.08);
}

.lesson-intro .level-table span {
    color: #175a35;
    background: rgba(47, 106, 70, 0.06);
    font-weight: 800;
}

.cpp-hub-page .lesson-intro .level-table span {
    color: #0f4a2c;
    background: #e4eadc;
    text-shadow: none;
}

.cpp-hub-page .lesson-intro .section-kicker {
    color: #0f5a36;
}

.card-detail-link {
    width: fit-content;
    margin-top: 1.4rem;
}

.bloodmoon-hero {
    position: relative;
    min-height: 82vh;
    display: grid;
    align-items: end;
    overflow: hidden;
    isolation: isolate;
    padding: 8.5rem max(1.25rem, calc((100vw - var(--max)) / 2)) 5.5rem;
}

.bloodmoon-hero-bg {
    position: absolute;
    inset: 0;
    z-index: -3;
    background:
        linear-gradient(90deg, rgba(8, 9, 12, 0.94), rgba(8, 9, 12, 0.58), rgba(8, 9, 12, 0.2)),
        url("../../pics/minecraft-069-bloodmoon-reaper-hero.png") center / cover no-repeat;
    transform: scale(1.02);
}

.bloodmoon-hero-content {
    max-width: 820px;
}

.bloodmoon-hero h1 {
    margin: 0;
    max-width: 8ch;
    font-size: 4.6rem;
    line-height: 0.96;
    font-weight: 900;
}

.bloodmoon-overview {
    color: var(--ink);
    background: var(--paper);
}

.bloodmoon-overview .section-kicker,
.bloodmoon-lore .section-kicker,
.bloodmoon-course-area .section-kicker,
.bloodmoon-summary .section-kicker {
    color: #2f6a46;
}

.bloodmoon-overview-grid,
.bloodmoon-lore-layout,
.bloodmoon-split,
.bloodmoon-video-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 3rem;
    align-items: center;
}

.bloodmoon-overview h2,
.bloodmoon-lore h2,
.bloodmoon-split h2,
.bloodmoon-video-layout h2 {
    margin: 0;
    font-size: 2.35rem;
    line-height: 1.15;
}

.bloodmoon-overview p,
.bloodmoon-split p,
.bloodmoon-video-layout p {
    color: #353832;
    font-size: 1.05rem;
}

.bloodmoon-figure img {
    aspect-ratio: 16 / 9;
}

.bloodmoon-lore {
    color: var(--paper);
    background: #10151d;
}

.bloodmoon-lore .section-kicker {
    color: var(--rose);
}

.bloodmoon-lore-layout {
    align-items: start;
}

.bloodmoon-lore-side {
    display: grid;
    gap: 1rem;
}

.bloodmoon-lore-card {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(255, 93, 125, 0.14), rgba(72, 216, 255, 0.05)), #0c0f14;
    border: 1px solid rgba(247, 244, 236, 0.14);
    border-left: 4px solid var(--rose);
    border-radius: 8px;
}

.bloodmoon-lore-card h3 {
    margin: 0 0 0.8rem;
    font-size: 1.35rem;
}

.bloodmoon-lore-card p {
    margin: 0;
    color: rgba(247, 244, 236, 0.82);
    font-size: 1.05rem;
}

.bloodmoon-lore-card p + p {
    margin-top: 0.9rem;
}

.bloodmoon-lore-note {
    color: #ffd5dc;
    font-weight: 900;
}

.bloodmoon-lore-image,
.bloodmoon-reference-panel figure {
    margin: 0;
    overflow: hidden;
    background: #08090c;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.bloodmoon-lore-image img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    object-position: center 38%;
}

.bloodmoon-lore-image figcaption {
    padding: 0.85rem 1rem;
    color: rgba(247, 244, 236, 0.82);
    border-top: 1px solid var(--line);
    font-weight: 800;
}

.bloodmoon-course-area,
.bloodmoon-summary {
    color: var(--ink);
    background: #f1eee5;
}

.bloodmoon-module-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.bloodmoon-module-grid article {
    min-height: 15rem;
    padding: 1.35rem;
    color: var(--paper);
    background: #10151d;
    border: 1px solid rgba(8, 9, 12, 0.16);
    border-radius: 8px;
}

.bloodmoon-module-grid span {
    color: var(--cyan);
    font-size: 0.82rem;
    font-weight: 900;
}

.bloodmoon-module-grid h3,
.bloodmoon-spec-grid h3 {
    margin: 0.8rem 0 0.55rem;
    font-size: 1.25rem;
}

.bloodmoon-module-grid p {
    margin: 0;
    color: rgba(247, 244, 236, 0.78);
}

.diagram-figure {
    margin: 1.2rem 0 0;
    overflow: hidden;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    background: #10151d;
}

.diagram-figure img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.diagram-figure figcaption {
    min-height: 3.4rem;
    display: flex;
    align-items: center;
    padding: 0.85rem 1rem;
    color: rgba(247, 244, 236, 0.84);
    border-top: 1px solid var(--line);
    font-weight: 800;
}

.bloodmoon-lesson-flow {
    background: #15120f;
}

.bloodmoon-lesson-flow .bloodmoon-split p {
    color: var(--muted);
}

.bloodmoon-steps {
    display: grid;
    gap: 0.8rem;
    margin: 1.4rem 0 0;
    padding: 0;
    list-style: none;
}

.bloodmoon-steps li {
    padding: 0.9rem 1rem;
    color: rgba(247, 244, 236, 0.86);
    background: rgba(255, 255, 255, 0.055);
    border: 1px solid var(--line);
    border-radius: 8px;
}

.bloodmoon-steps strong {
    color: var(--lime);
}

.bloodmoon-work-area {
    background: #0c0f14;
}

.bloodmoon-reference-panel {
    display: grid;
    grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1fr);
    gap: 1.2rem;
    align-items: stretch;
    margin-bottom: 1rem;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(255, 93, 125, 0.12), rgba(72, 216, 255, 0.04)), #10151d;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.bloodmoon-reference-panel figure {
    height: 30rem;
    min-height: 22rem;
}

.bloodmoon-reference-panel img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
}

.bloodmoon-reference-panel > div {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0.4rem 0.4rem 0.4rem 0;
}

.bloodmoon-reference-panel .section-kicker {
    color: var(--rose);
}

.bloodmoon-reference-panel h3 {
    margin: 0;
    max-width: 13ch;
    font-size: 2rem;
    line-height: 1.15;
}

.bloodmoon-reference-panel p:last-child {
    max-width: 56rem;
    margin: 1rem 0 0;
    color: var(--muted);
    font-size: 1.05rem;
}

.bloodmoon-spec-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.bloodmoon-spec-grid article {
    min-height: 17rem;
    padding: 1.35rem;
    background: #10151d;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.bloodmoon-spec-grid p {
    margin: 0;
    color: var(--muted);
}

.bloodmoon-spec-grid dl {
    display: grid;
    gap: 0.65rem;
    margin: 1rem 0 0;
}

.bloodmoon-spec-grid dl div {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
    gap: 0.8rem;
    align-items: center;
    padding-bottom: 0.65rem;
    border-bottom: 1px solid var(--line);
}

.bloodmoon-spec-grid dt {
    color: var(--muted);
    font-weight: 800;
}

.bloodmoon-spec-grid dd {
    margin: 0;
    color: var(--lime);
    font-weight: 900;
}

.skill-table {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #10151d;
}

.skill-table div {
    display: grid;
    grid-template-columns: minmax(9rem, 0.24fr) minmax(0, 0.76fr);
}

.skill-table div + div {
    border-top: 1px solid var(--line);
}

.skill-table strong,
.skill-table span {
    padding: 0.95rem 1rem;
}

.skill-table strong {
    color: var(--rose);
}

.skill-table span {
    color: rgba(247, 244, 236, 0.82);
    background: rgba(255, 255, 255, 0.035);
}

.bloodmoon-video-section {
    color: var(--ink);
    background: var(--paper);
}

.bloodmoon-video-section .section-kicker {
    color: #2f6a46;
}

.bloodmoon-video-card {
    background: #10151d;
}

.bloodmoon-video-card video {
    aspect-ratio: 16 / 9;
}

.bloodmoon-summary .summary-panel p {
    color: #353832;
    font-size: 1.05rem;
}

@media (max-width: 920px) {
    .site-nav {
        position: fixed;
        left: 1rem;
        right: 1rem;
        top: 4.6rem;
        display: none;
        grid-template-columns: 1fr;
        gap: 0;
        padding: 0.7rem;
        background: rgba(8, 9, 12, 0.96);
        border: 1px solid var(--line);
        border-radius: 8px;
    }

    .site-nav.is-open {
        display: grid;
    }

    .site-nav a {
        padding: 0.82rem;
    }

    .nav-toggle {
        display: block;
    }

    .hero {
        min-height: 80vh;
        padding-top: 7rem;
        padding-bottom: 7.5rem;
    }

    .hero h1 {
        font-size: 3.1rem;
    }

    .hero-copy {
        font-size: 1.02rem;
    }

    .hero-strip {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .intro-grid,
    .stack-grid,
    .method-layout,
    .contact-layout,
    .section-heading,
    .program-card,
    .lesson-two-col,
    .lesson-split,
    .code-showcase,
    .mnemonic-layout,
    .bloodmoon-overview-grid,
    .bloodmoon-lore-layout,
    .bloodmoon-reference-panel,
    .bloodmoon-split,
    .bloodmoon-video-layout {
        grid-template-columns: 1fr;
    }

    .bloodmoon-reference-panel > div {
        padding: 0.2rem 0 0;
    }

    .bloodmoon-reference-panel h3 {
        max-width: none;
    }

    .lesson-hero {
        min-height: 80vh;
        padding-top: 7rem;
        padding-bottom: 7.5rem;
    }

    .lesson-hero h1 {
        font-size: 3.1rem;
    }

    .bloodmoon-hero {
        min-height: 80vh;
        padding-top: 7rem;
        padding-bottom: 7.5rem;
    }

    .bloodmoon-hero h1 {
        font-size: 3.1rem;
    }

    .program-card {
        min-height: 0;
    }

    .program-media {
        min-height: 18rem;
    }

    .gallery-grid,
    .video-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .bloodmoon-module-grid,
    .bloodmoon-spec-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .pointer-grid,
    .mistake-grid,
    .mnemonic-grid,
    .copy-vs-address,
    .memory-link-diagram,
    .heap-diagram,
    .double-pointer-layout {
        grid-template-columns: 1fr;
    }

    .practice-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .quiz-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .runtime-layers,
    .best-grid,
    .ai-concept-grid,
    .ai-practice-layout {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .six-flow {
        grid-template-columns: 1fr;
    }

    .memory-link-diagram > svg,
    .heap-diagram > svg {
        justify-self: center;
        transform: rotate(90deg);
    }

    .array-memory {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .practice-card:first-child,
    .practice-card:last-child {
        grid-column: auto;
    }

    .pointer-flow {
        grid-template-columns: 1fr;
    }

    .pointer-flow li {
        min-height: 0;
    }

    .pointer-flow li:not(:last-child)::after {
        top: auto;
        right: auto;
        bottom: -1.2rem;
        left: 50%;
        width: 2px;
        height: 1.2rem;
    }

    .pointer-flow li:not(:last-child)::before {
        top: auto;
        right: auto;
        bottom: -1.32rem;
        left: calc(50% - 0.27rem);
        transform: rotate(135deg);
    }

    .footer-inner {
        grid-template-columns: 1fr;
        text-align: left;
    }

    .footer-links {
        justify-content: flex-start;
    }

    .copyright {
        text-align: left;
    }
}

@media (max-width: 620px) {
    .cookie-consent {
        inset: auto 0.75rem 0.75rem;
    }

    .cookie-card {
        grid-template-columns: 1fr;
        max-height: calc(100vh - 1.5rem);
        overflow: auto;
        padding: 0.85rem;
    }

    .cookie-actions {
        grid-template-columns: 1fr;
    }

    .cookie-settings-button {
        right: 0.75rem;
        bottom: 0.75rem;
    }

    .privacy-main {
        padding-top: 6.5rem;
    }

    .privacy-shell {
        width: min(100% - 2rem, var(--max));
        padding-top: 2rem;
    }

    .privacy-hero,
    .privacy-grid {
        grid-template-columns: 1fr;
    }

    .privacy-hero h1 {
        font-size: 2.45rem;
    }

    .site-header {
        padding: 0.85rem 1rem;
    }

    .brand-mark {
        width: 5.2rem;
        height: 3.6rem;
    }

    .brand-name {
        font-size: 1.08rem;
    }

    .hero {
        min-height: 78vh;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .lesson-hero {
        min-height: 78vh;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .lesson-hero h1 {
        font-size: 2.5rem;
    }

    .bloodmoon-hero {
        min-height: 78vh;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .bloodmoon-hero h1 {
        font-size: 2.5rem;
    }

    .hero-actions {
        display: grid;
        grid-template-columns: 1fr;
        max-width: 19rem;
    }

    .hero-strip {
        left: 1rem;
        right: 1rem;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .bloodmoon-lore-image img {
        aspect-ratio: 4 / 3;
    }

    .bloodmoon-reference-panel {
        padding: 0.8rem;
    }

    .bloodmoon-reference-panel figure {
        height: 24rem;
        min-height: 20rem;
    }

    .bloodmoon-reference-panel h3 {
        font-size: 1.5rem;
    }

    .section {
        padding: 4rem 1rem;
    }

    .intro-grid,
    .stack-grid,
    .method-layout,
    .contact-layout {
        gap: 2rem;
    }

    .intro-grid h2,
    .section-heading h2,
    .method-copy h2,
    .stack-grid h2,
    .contact-copy h2,
    .lesson-two-col h2,
    .lesson-copy h2,
    .flow-section h2,
    .modify-section h2,
    .coins-section h2,
    .mnemonic-layout h2,
    .summary-panel h2,
    .practice-section h2,
    .mistake-section h2,
    .bloodmoon-overview h2,
    .bloodmoon-lore h2,
    .bloodmoon-split h2,
    .bloodmoon-video-layout h2 {
        font-size: 1.78rem;
    }

    .lesson-two-col,
    .lesson-split,
    .code-showcase,
    .mnemonic-layout {
        gap: 2rem;
    }

    .memory-board,
    .score-change,
    .practice-grid,
    .quiz-grid,
    .array-memory,
    .swap-diagram,
    .runtime-layers,
    .best-grid {
        grid-template-columns: 1fr;
    }

    .score-change svg,
    .swap-diagram svg {
        justify-self: center;
        transform: rotate(90deg);
    }

    .copy-vs-address article,
    .memory-node,
    .heap-block,
    .array-memory div {
        min-height: 0;
    }

    .array-equations article,
    .rule-pair article,
    .level-table div {
        grid-template-columns: 1fr;
    }

    .array-equations svg,
    .rule-pair svg {
        transform: rotate(90deg);
    }

    .summary-panel {
        padding: 1.2rem;
    }

    .program-body {
        padding: 1.2rem;
    }

    .program-body h3 {
        font-size: 1.55rem;
    }

    .method-steps,
    .gallery-grid,
    .video-grid,
    .two-col,
    .bloodmoon-module-grid,
    .bloodmoon-spec-grid,
    .skill-table div,
    .bloodmoon-spec-grid dl div {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 920px) {
    .ai-lesson-grid {
        grid-template-columns: 1fr;
    }

    .ai-lesson-card {
        padding: 1.1rem;
    }

    .ai-detail-block pre {
        max-height: 20rem;
    }
}

@media (max-width: 620px) {
    .ai-phase-grid {
        grid-template-columns: 1fr;
    }

    .ai-lesson-card h3 {
        font-size: 1.38rem;
    }

    .ai-lesson-topline {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.5rem;
    }

    .ai-detail-block {
        padding: 0.85rem;
    }

    .ai-detail-block pre {
        font-size: 0.82rem;
    }

    .ai-concept-grid,
    .ai-practice-layout {
        grid-template-columns: 1fr;
    }
}