/* ==========================================================================
   Gao Chenkai — Chenkai Space Design System
   Editorial · Minimal · Warm Humanist · Built in Public
   Aligned with kryptongao.github.io
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root {
    /* Surface & ink */
    --bg:            #FAFAF7;   /* warm off-white / alabaster */
    --bg-2:          #F3F1EA;   /* alt section cream */
    --surface:       #FFFFFF;
    --surface-soft:  #F6F4EE;
    --text:          #14161A;   /* near-charcoal */
    --text-2:        #3C3F46;   /* body text */
    --muted:         #6B6F76;   /* secondary copy */
    --faint:         #9AA0A8;   /* captions & borders */
    --line:          #E6E2D9;   /* warm hairline */
    --line-strong:   #D6D1C6;

    /* Accent — refined teal (kin to GitHub green & Anthropic aesthetic) */
    --accent:        #2E8F86;
    --accent-hover:  #24766E;
    --accent-2:      #D7765A;   /* warm terracotta / clay, used for numerals & kickers */
    --accent-soft:   rgba(46, 143, 134, 0.08);
    --accent-line:   rgba(46, 143, 134, 0.22);

    /* Links */
    --link:          #2E8F86;
    --link-hover:    #24766E;

    /* Typography */
    --font-serif: "Lora", Georgia, "Times New Roman", "Songti SC", serif;
    --font-sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    --font-mono:  ui-monospace, SFMono-Regular, Menlo, "SF Mono", monospace;

    /* Spacing scale */
    --space-1:  4px;
    --space-2:  8px;
    --space-3:  12px;
    --space-4:  16px;
    --space-5:  24px;
    --space-6:  32px;
    --space-7:  48px;
    --space-8:  64px;
    --space-9:  96px;
    --space-10: 128px;

    /* Radius */
    --radius-sm: 6px;
    --radius:    10px;
    --radius-lg: 18px;
    --radius-xl: 28px;
    --radius-pill: 999px;

    /* Shadows — restrained & layered */
    --shadow-sm: 0 1px 2px rgb(20 22 26 / 0.04);
    --shadow-md: 0 6px 24px -10px rgb(20 22 26 / 0.12);
    --shadow-lg: 0 24px 60px -24px rgb(20 22 26 / 0.16);

    /* Layout */
    --shell:        min(calc(100% - 48px), 1120px);
    --shell-narrow: min(calc(100% - 48px), 860px);
    --masthead-h:   64px;

    /* Motion */
    --ease:     cubic-bezier(0.22, 1, 0.36, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --dur-fast: 0.18s;
    --dur:      0.32s;
    --dur-slow: 0.6s;
}

html[data-theme="dark"] {
    --bg:            #0E1014;   /* obsidian deep dark */
    --bg-2:          #14171D;   /* alt panel dark */
    --surface:       #181C23;
    --surface-soft:  #14171D;
    --text:          #ECEAE4;
    --text-2:        #C0BDB6;
    --muted:         #8A8E96;
    --faint:         #5C616B;
    --line:          #262A32;
    --line-strong:   #333943;

    --accent:        #4FB0A4;
    --accent-hover:  #6BC4B8;
    --accent-2:      #E8917A;
    --accent-soft:   rgba(79, 176, 164, 0.10);
    --accent-line:   rgba(79, 176, 164, 0.28);

    --link:          #4FB0A4;
    --link-hover:    #6BC4B8;

    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
    --shadow-md: 0 6px 24px -10px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 24px 60px -24px rgb(0 0 0 / 0.6);
}

/* --------------------------------------------------------------------------
   2. Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--masthead-h) + 20px);
    -webkit-text-size-adjust: 100%;
}

body {
    min-width: 320px;
    min-height: 100vh;
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    letter-spacing: -0.01em;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
    overflow-x: hidden;
}

a {
    color: var(--link);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color var(--dur-fast) ease;
}
a:hover { color: var(--link-hover); }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

img { max-width: 100%; height: auto; display: block; }

::selection { background: var(--accent-soft); color: var(--text); }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

/* --------------------------------------------------------------------------
   3. Icon sprite & utility
   -------------------------------------------------------------------------- */
.icon-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

.icon {
    width: 1em;
    height: 1em;
    flex: 0 0 auto;
    fill: currentColor;
}

.sr-only,
.visually-hidden {
    position: absolute;
    width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
    position: fixed; top: 12px; left: 12px; z-index: 200;
    padding: 10px 18px; background: var(--text); color: var(--bg);
    font-size: 13px; font-weight: 600; border-radius: var(--radius-sm);
    transform: translateY(-64px);
    transition: transform var(--dur-fast) var(--ease);
}
.skip-link:focus-visible { transform: none; }

/* --------------------------------------------------------------------------
   4. Layout shells
   -------------------------------------------------------------------------- */
.shell {
    width: var(--shell);
    max-width: 100%;
    margin: 0 auto;
}

.shell-narrow {
    width: var(--shell-narrow);
    max-width: 100%;
    margin: 0 auto;
}

/* --------------------------------------------------------------------------
   5. Masthead + navigation
   -------------------------------------------------------------------------- */
.masthead {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--line);
    background: var(--bg);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    flex: 0 0 auto;
    transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.masthead-inner {
    width: var(--shell);
    max-width: 100%;
    margin: 0 auto;
}

.site-nav {
    min-height: var(--masthead-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

/* Wordmark */
.wordmark {
    display: inline-flex;
    align-items: baseline;
    gap: 7px;
    padding: 4px 2px;
    color: var(--text);
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
    line-height: 1;
}
.wordmark:hover { color: var(--text); }
.wordmark b { color: var(--accent); font-weight: 700; }
.wordmark span {
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: stretch;
    min-height: var(--masthead-h);
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-links a {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-height: var(--masthead-h);
    padding: 0 16px;
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--dur-fast) ease;
}
.nav-links a:hover,
.nav-links a.is-active { color: var(--text); }
.nav-links a.is-active { font-weight: 600; }

.nav-links a::after {
    position: absolute;
    right: 16px;
    bottom: 14px;
    left: 16px;
    height: 2px;
    background: var(--accent);
    content: "";
    opacity: 0;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform var(--dur) var(--ease), opacity var(--dur-fast) ease;
}
.nav-links a:hover::after,
.nav-links a.is-active::after { opacity: 1; transform: scaleX(1); }

.nav-links .icon { width: 14px; height: 14px; color: var(--faint); }

.control-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Lang Switcher (Pill Switch) */
.lang-switch {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--surface);
    padding: 2px;
    gap: 2px;
}
.lang-switch button {
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--muted);
    transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease;
}
.lang-switch button[aria-pressed="true"] {
    background: var(--accent);
    color: #FFFFFF;
}
.lang-switch button:hover:not([aria-pressed="true"]) {
    color: var(--text);
}

.control-btn,
.nav-toggle {
    display: inline-flex;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--muted);
    cursor: pointer;
    transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease, background-color var(--dur-fast) ease, transform var(--dur-fast) ease;
}
.control-btn:hover,
.nav-toggle:hover { border-color: var(--line-strong); color: var(--text); }
.control-btn:active { transform: scale(0.94); }
.nav-toggle { display: none; }

/* Scroll progress bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 100%;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: 0 0;
    z-index: 60;
    pointer-events: none;
    transition: transform 0.1s linear;
}

/* --------------------------------------------------------------------------
   6. Typography primitives
   -------------------------------------------------------------------------- */
.kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 var(--space-4);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}
.kicker::before {
    content: "";
    width: 24px;
    height: 1px;
    background: var(--accent);
}

.eyebrow {
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.display {
    margin: 0;
    color: var(--text);
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.lead {
    margin: 0;
    color: var(--text-2);
    font-family: var(--font-serif);
    font-size: clamp(1.15rem, 2vw, 1.4rem);
    line-height: 1.6;
    font-weight: 400;
    letter-spacing: -0.005em;
}

.lede {
    margin: 0;
    color: var(--text-2);
    font-size: 1.06rem;
    line-height: 1.75;
    max-width: 62ch;
}

.serif { font-family: var(--font-serif); }
.mono  { font-family: var(--font-mono); }

/* --------------------------------------------------------------------------
   7. Section primitives (numbered, divided, editorial)
   -------------------------------------------------------------------------- */
.section {
    padding: var(--space-9) 0;
    border-top: 1px solid var(--line);
}
.section:first-of-type { border-top: 0; }
.section--alt { background: var(--bg-2); }
.section--tight { padding: var(--space-8) 0; }

.section-head {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    gap: var(--space-6);
    align-items: baseline;
    margin-bottom: var(--space-7);
}

.section-index {
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}
.section-index b { color: var(--accent-2); font-weight: 600; }

.section-title {
    margin: 0;
    color: var(--text);
    font-family: var(--font-serif);
    font-size: clamp(1.6rem, 3.2vw, 2.3rem);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-sub {
    margin: var(--space-3) 0 0;
    color: var(--muted);
    font-size: 0.98rem;
    line-height: 1.65;
    max-width: 60ch;
}

/* --------------------------------------------------------------------------
   8. Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 13px 24px;
    border: 1px solid var(--text);
    border-radius: var(--radius-pill);
    background: var(--text);
    color: var(--bg);
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: -0.005em;
    text-decoration: none;
    cursor: pointer;
    transition: transform var(--dur-fast) var(--ease), background-color var(--dur-fast) ease, color var(--dur-fast) ease, border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.btn:hover {
    color: var(--bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.btn:active { transform: translateY(0); }

.btn .arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .arrow { transform: translate(3px, -3px); }

.btn--ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--line-strong);
}
.btn--ghost:hover {
    color: var(--text);
    border-color: var(--text);
    background: var(--surface-soft);
    box-shadow: var(--shadow-sm);
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   9. Hero
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    padding: clamp(72px, 13vh, 130px) 0 var(--space-9);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, var(--line) 1px, transparent 1px),
        linear-gradient(to bottom, var(--line) 1px, transparent 1px);
    background-size: 64px 64px;
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 75%);
    mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 75%);
    opacity: 0.55;
}

.hero-glow {
    position: absolute;
    top: -20%;
    left: 50%;
    width: 70vw;
    height: 70vw;
    max-width: 900px;
    max-height: 900px;
    transform: translateX(-50%);
    background: radial-gradient(circle, var(--accent-soft) 0%, transparent 60%);
    filter: blur(20px);
}

.hero-inner {
    position: relative;
    z-index: 2;
    width: var(--shell);
    max-width: 100%;
    margin: 0 auto;
}

.hero-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}
.hero-top .eyebrow { white-space: nowrap; }

.hero-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
}
.hero-status::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 0 var(--accent-line);
    animation: pulse 2.4s var(--ease) infinite;
}

.hero-name {
    font-size: clamp(2.8rem, 8.5vw, 5.8rem);
    letter-spacing: -0.04em;
    line-height: 1.02;
}
.hero-name em {
    font-style: italic;
    color: var(--accent);
    font-weight: 500;
}

.hero-line {
    margin: var(--space-5) 0 0;
    font-size: clamp(1.2rem, 2.4vw, 1.6rem);
    line-height: 1.45;
    max-width: 28ch;
    color: var(--text-2);
}

.hero-sub {
    margin: var(--space-5) 0 0;
    color: var(--muted);
    font-size: 1.02rem;
    line-height: 1.7;
    max-width: 54ch;
}

.hero-actions {
    margin-top: var(--space-7);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-7);
    margin-top: var(--space-8);
    padding-top: var(--space-5);
    border-top: 1px solid var(--line);
}
.hero-meta-item { min-width: 0; }
.hero-meta-item .eyebrow { display: block; margin-bottom: 4px; }
.hero-meta-item p { margin: 0; color: var(--text-2); font-size: 0.95rem; line-height: 1.5; }
.hero-meta-item a { color: var(--text-2); text-decoration: none; border-bottom: 1px solid var(--line-strong); }
.hero-meta-item a:hover { color: var(--accent); border-color: var(--accent); }

/* Hero decorative floating profile card */
.hero-card {
    position: absolute;
    top: 16%;
    right: -2%;
    width: clamp(230px, 27vw, 340px);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    padding: var(--space-5);
    z-index: 1;
    transform: rotate(3deg);
    opacity: 0;
    animation: hero-card-in 0.8s var(--ease) 0.3s forwards;
    transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) ease, border-color var(--dur-fast) ease;
}
.hero-card:hover {
    transform: rotate(1deg) translateY(-4px);
    box-shadow: 0 30px 70px -20px rgb(0 0 0 / 0.22);
    border-color: var(--accent-line);
}
.hero-card-head { display: flex; align-items: center; gap: 12px; margin-bottom: var(--space-4); }
.hero-card-avatar {
    width: 44px; height: 44px; border-radius: 50%;
    object-fit: cover; border: 1px solid var(--line);
}
.hero-card-name { font-family: var(--font-serif); font-weight: 600; font-size: 1rem; color: var(--text); line-height: 1.2; }
.hero-card-role { color: var(--muted); font-size: 0.78rem; }
.hero-card-notes { display: flex; flex-direction: column; gap: var(--space-3); }
.hero-card-note { display: flex; gap: 10px; align-items: flex-start; }
.hero-card-note i { width: 4px; height: 18px; border-radius: 2px; flex: 0 0 auto; margin-top: 2px; }
.hero-card-note:nth-child(1) i { background: var(--accent-2); }
.hero-card-note:nth-child(2) i { background: var(--accent); }
.hero-card-note:nth-child(3) i { background: #E3B56B; }
.hero-card-note b { display: block; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; color: var(--text); }
.hero-card-note span { color: var(--muted); font-size: 0.82rem; line-height: 1.45; }

@keyframes hero-card-in {
    from { opacity: 0; transform: rotate(3deg) translateY(24px); }
    to   { opacity: 1; transform: rotate(3deg) translateY(0); }
}

/* --------------------------------------------------------------------------
   10. Selected Work (Editorial magazine project list)
   -------------------------------------------------------------------------- */
.work-list {
    display: flex;
    flex-direction: column;
}

.work-item {
    display: grid;
    grid-template-columns: 56px minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-6);
    padding: var(--space-7) 0;
    border-top: 1px solid var(--line);
    transition: background-color var(--dur) var(--ease);
}
.work-item:first-child { border-top: 0; }

.work-num {
    color: var(--accent-2);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    padding-top: 6px;
}

.work-body { min-width: 0; }
.work-name {
    margin: 0 0 var(--space-2);
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 2.6vw, 1.85rem);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}
.work-name a { color: var(--text); text-decoration: none; }
.work-name a:hover { color: var(--accent); }

.work-desc {
    margin: 0 0 var(--space-4);
    color: var(--text-2);
    font-size: 0.98rem;
    line-height: 1.7;
    max-width: 52ch;
}

.work-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: var(--space-4);
}

.tag {
    padding: 4px 10px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-pill);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    background: var(--surface);
}

.work-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--accent);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
}
.work-link .arrow { transition: transform var(--dur) var(--ease); }
.work-link:hover .arrow { transform: translate(3px, -3px); }

.work-media {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    overflow: hidden;
    aspect-ratio: 16 / 10;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}
.work-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--dur-slow) var(--ease);
}
.work-item:hover .work-media img { transform: scale(1.04); }

.work-media.media-contain {
    background: var(--surface-soft);
}
.work-media.media-contain img {
    width: 60%;
    height: auto;
    max-height: 80%;
    object-fit: contain;
}

/* --------------------------------------------------------------------------
   11. Stats grid
   -------------------------------------------------------------------------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.stat-item {
    padding: var(--space-4) var(--space-5);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) ease;
}
.stat-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent-line);
}
.stat-item strong {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent);
    line-height: 1.1;
}
.stat-item span {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   12. About & Principles
   -------------------------------------------------------------------------- */
.about-block {
    display: grid;
    grid-template-columns: 80px minmax(0, 1fr);
    gap: var(--space-5);
    padding: var(--space-6) 0;
    border-top: 1px solid var(--line);
}
.about-block:first-of-type { border-top: 0; }

.about-block-num {
    color: var(--accent-2);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    padding-top: 8px;
}

.about-block h3 {
    margin: 0 0 var(--space-3);
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.2vw, 1.55rem);
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.015em;
    color: var(--text);
}

.readme-copy {
    margin: 0;
    color: var(--text-2);
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.8;
}
.readme-copy + .readme-copy { margin-top: var(--space-3); }

.readme-list {
    margin: 0;
    padding-left: 1.4rem;
    color: var(--text-2);
    font-family: var(--font-serif);
    font-size: 1.04rem;
    line-height: 1.8;
}
.readme-list li + li { margin-top: 10px; }
.readme-list li::marker { color: var(--accent); font-weight: 700; }
.readme-list strong { color: var(--text); font-weight: 600; }

/* --------------------------------------------------------------------------
   13. Capabilities / Skills Grid
   -------------------------------------------------------------------------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
}

.skill-card {
    padding: var(--space-5);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.skill-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-line);
    box-shadow: var(--shadow-sm);
}

.skill-num {
    color: var(--accent-2);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
}

.skill-card h3 {
    margin: 0;
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
}

.skill-card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
    line-height: 1.6;
}

.skills-tags-bar {
    margin-top: var(--space-6);
    padding: var(--space-4) var(--space-5);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-soft);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.6;
    letter-spacing: 0.04em;
    text-align: center;
}

/* --------------------------------------------------------------------------
   14. Principle Quote Callout
   -------------------------------------------------------------------------- */
.quote-card {
    margin: 0;
    padding: var(--space-7) var(--space-6);
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}

.quote-lines {
    margin: 0;
    color: var(--text);
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 2.8vw, 2.2rem);
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.02em;
}
.quote-lines em {
    font-style: italic;
    color: var(--accent);
}

/* --------------------------------------------------------------------------
   15. Contact Grid
   -------------------------------------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.contact-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-5);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    text-decoration: none;
    color: var(--text);
    transition: border-color var(--dur-fast) ease, transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) ease;
}
.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.contact-card .icon { width: 20px; height: 20px; color: var(--accent); }
.contact-card-label { color: var(--faint); font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; }
.contact-card-value { color: var(--text); font-size: 0.98rem; font-weight: 600; word-break: break-all; }

/* --------------------------------------------------------------------------
   16. Footer
   -------------------------------------------------------------------------- */
.footer {
    margin-top: auto;
    flex: 0 0 auto;
    padding: var(--space-8) 0 var(--space-6);
    border-top: 1px solid var(--line);
    background: var(--bg-2);
    color: var(--muted);
}

.footer-inner {
    width: var(--shell);
    max-width: 100%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: var(--space-7);
    align-items: start;
}

.footer-brand { max-width: 44ch; }
.footer-brand p { margin: var(--space-2) 0 0; font-size: 0.92rem; line-height: 1.6; color: var(--muted); }
.footer-brand .wordmark { font-size: 1.15rem; }

.footer-nav-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
}

.footer-col h5 {
    margin: 0 0 var(--space-3);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.footer-col ul {
    margin: 0; padding: 0; list-style: none;
    display: flex; flex-direction: column; gap: 8px;
}

.footer-col a {
    color: var(--muted);
    font-size: 0.88rem;
    text-decoration: none;
    transition: color var(--dur-fast) ease;
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
    width: var(--shell);
    max-width: 100%;
    margin: var(--space-7) auto 0;
    padding-top: var(--space-4);
    border-top: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.04em;
}
.footer-bottom p { margin: 0; }
.footer-bottom a { color: var(--muted); text-decoration: none; }
.footer-bottom a:hover { color: var(--accent); }

/* --------------------------------------------------------------------------
   17. Motion — reveals, animations, parallax
   -------------------------------------------------------------------------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
    will-change: opacity, transform;
}
[data-reveal].is-revealed { opacity: 1; transform: translateY(0); }

[data-reveal-stagger] > * {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
[data-reveal-stagger].is-revealed > * { opacity: 1; transform: translateY(0); }

@keyframes page-fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes masthead-enter {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
    0%   { box-shadow: 0 0 0 0 var(--accent-line); }
    70%  { box-shadow: 0 0 0 8px transparent; }
    100% { box-shadow: 0 0 0 0 transparent; }
}

body { animation: page-fade-in 0.4s var(--ease) both; }
.masthead { animation: masthead-enter 0.3s var(--ease) both; }

[data-parallax] { will-change: transform; }

/* --------------------------------------------------------------------------
   18. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
    .hero-card { display: none; }
    .work-item { grid-template-columns: 40px minmax(0, 1fr); }
    .work-media { grid-column: 1 / -1; margin-top: var(--space-2); aspect-ratio: 16 / 10; }
    .section-head { grid-template-columns: 1fr; gap: var(--space-2); }
    .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
    :root {
        --shell: min(calc(100% - 36px), 680px);
        --shell-narrow: min(calc(100% - 36px), 680px);
    }

    .site-nav { position: relative; }
    .nav-toggle { display: inline-flex; }

    .nav-links {
        position: absolute;
        top: var(--masthead-h); right: 0; left: 0;
        display: none;
        min-height: 0;
        flex-direction: column;
        border: 1px solid var(--line);
        border-top: 0;
        background: var(--bg);
        box-shadow: var(--shadow-md);
    }
    .nav-links.is-open { display: flex; }
    .nav-links li + li { border-top: 1px solid var(--line); }
    .nav-links a { width: 100%; min-height: 48px; padding: 0 var(--space-4); }
    .nav-links a.is-active::after { right: var(--space-4); bottom: 0; left: var(--space-4); }
    .control-buttons { margin-left: auto; }

    .hero { padding: clamp(56px, 12vh, 96px) 0 var(--space-8); }
    .hero-top { margin-bottom: var(--space-7); }
    .hero-meta { gap: var(--space-3) var(--space-5); }

    .work-item { grid-template-columns: 1fr; gap: var(--space-3); padding: var(--space-6) 0; }
    .work-num { padding-top: 0; }

    .about-block { grid-template-columns: 1fr; gap: var(--space-2); }
    .about-block-num { padding-top: 0; }

    .skills-grid { grid-template-columns: 1fr; }
    .footer-nav-grid { grid-template-columns: 1fr; gap: var(--space-5); }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 430px) {
    :root {
        --shell: min(calc(100% - 28px), 560px);
        --shell-narrow: min(calc(100% - 28px), 560px);
    }
    .hero-name { font-size: clamp(2.4rem, 13vw, 3.6rem); }
    .stats-grid { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   19. Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation: none !important;
        transition-duration: 0.01ms !important;
    }
    [data-reveal],
    [data-reveal-stagger] > * { opacity: 1 !important; transform: none !important; }
    .hero-card { opacity: 1 !important; }
}