/* ==========================================================================
   X-Following-Gallery — design system

   This file is a *system*, not a bag of values: every size, space, duration and
   curve comes from a scale defined once in :root. If you find yourself writing a
   raw px value in a component rule, add a token instead — the reason the first
   version looked generic was 59 distinct ad-hoc px values and no vertical rhythm.

   Colour is authored in OKLCH (Baseline since 2023, no fallback needed). Unlike
   HSL, OKLCH lightness is perceptually uniform, so equal L-steps read as equal
   steps — which is exactly what makes an elevation ramp look intentional rather
   than mushy. Neutrals carry a faint blue tint (chroma ~0.008 at hue 250);
   pure-gray next to colour reads cheap.
   ========================================================================== */

/* ---------- Tokens: dark (default) ---------- */
:root, [data-theme="oled"] {
  /* --- surface ramp: the void plus 3 elevation steps ---
     A true #000 void leaves nothing to darken, so depth collapses into
     "flat cards on black". Starting the void just off black with a clear
     ≥0.05 L step per level is what makes cards sit *above* the page. */
  --bg-app:         oklch(0.155 0.008 258);
  --surface-1:      oklch(0.215 0.010 258);   /* resting card            */
  --surface-2:      oklch(0.268 0.012 258);   /* hover / raised          */
  --surface-3:      oklch(0.320 0.014 258);   /* modal / popover         */
  --surface-chip:   oklch(0.30 0.012 258 / 0.7);
  --surface-sunken: oklch(0.135 0.007 258);   /* wells: search, selects  */

  /* --- ink --- */
  --text-main:      oklch(0.975 0.004 258);
  --text-secondary: oklch(0.790 0.012 258);
  --text-muted:     oklch(0.700 0.014 258);   /* ≥4.5:1 even on surface-3 (modal) */
  --text-inverse:   oklch(0.16 0.01 258);

  /* --- accents (authored, explicit hover/press — no relative-colour syntax,
         which is newer than OKLCH itself and not needed here) --- */
  --accent:         oklch(0.745 0.135 237);
  --accent-hover:   oklch(0.815 0.130 237);
  --accent-press:   oklch(0.680 0.135 237);
  --accent-subtle:  oklch(0.745 0.135 237 / 0.14);
  --accent-ring:    oklch(0.745 0.135 237 / 0.55);

  --gold:           oklch(0.800 0.150 78);
  --gold-subtle:    oklch(0.800 0.150 78 / 0.15);
  --spark:          oklch(0.740 0.190 350);
  --spark-subtle:   oklch(0.740 0.190 350 / 0.15);
  --verified:       oklch(0.685 0.150 240);
  --success:        oklch(0.760 0.150 160);
  --danger:         oklch(0.700 0.180 20);
  --danger-subtle:  oklch(0.700 0.180 20 / 0.15);

  /* --- hairlines --- */
  --line:           oklch(1 0 0 / 0.09);
  --line-strong:    oklch(1 0 0 / 0.17);
  --line-focus:     oklch(1 0 0 / 0.28);
  /* the 1px lit top edge — the single cheapest "real material" cue */
  --edge-highlight: inset 0 1px 0 oklch(1 0 0 / 0.07);

  /* --- elevation: layered + tinted, never one big black blur ---
     Offsets double per layer and blur tracks the offset; per-layer alpha drops.
     Tinted toward the background hue rather than pure black, which desaturates. */
  --sh-1:
    0 1px 2px oklch(0.12 0.02 258 / 0.34),
    0 3px 6px oklch(0.12 0.02 258 / 0.28);
  --sh-2:
    0 2px 4px oklch(0.12 0.02 258 / 0.36),
    0 6px 12px oklch(0.12 0.02 258 / 0.30),
    0 14px 24px oklch(0.12 0.02 258 / 0.26);
  --sh-3:
    0 4px 8px oklch(0.10 0.02 258 / 0.40),
    0 12px 24px oklch(0.10 0.02 258 / 0.34),
    0 28px 48px oklch(0.10 0.02 258 / 0.30);

  /* --- type: fluid where it should scale, fixed where it should not ---
     Endpoints are rem so 200% zoom still works (WCAG 1.4.4); the max is ≥2×
     the min. 11px micro-labels stay fixed — they must not scale down. */
  --fs-hero:    clamp(1.9rem,  1.1rem + 3.4vw, 3.5rem);
  --fs-h2:      clamp(1.45rem, 1.15rem + 1.4vw, 2.1rem);
  --fs-metric:  clamp(1.35rem, 1.2rem + 0.6vw, 1.7rem);
  --fs-card:    clamp(1rem,    0.97rem + 0.2vw, 1.09rem);
  --fs-body:    clamp(0.9375rem, 0.9rem + 0.14vw, 1.0625rem);
  --fs-sm:      clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
  --fs-micro:   0.6875rem;                     /* 11px — fixed on purpose */
  --fs-tiny:    0.75rem;                       /* 12px — fixed */

  --lh-display: 1.06;
  --lh-tight:   1.2;
  --lh-body:    1.55;
  --lh-flat:    1;

  /* tracking scales inversely with size: negative for display, positive for caps */
  --tk-display: -0.032em;
  --tk-h2:      -0.02em;
  --tk-card:    -0.011em;
  --tk-caps:     0.2em;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* --- space scale (4px base) — replaces ad-hoc px in components --- */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;   --sp-3: 0.75rem;  --sp-4: 1rem;
  --sp-5: 1.25rem;  --sp-6: 1.5rem;   --sp-8: 2rem;     --sp-10: 2.5rem;
  --sp-12: 3rem;    --sp-16: 4rem;

  /* --- radii --- */
  --r-xs: 6px;  --r-sm: 9px;  --r-md: 14px;  --r-lg: 20px;  --r-xl: 28px;
  --r-full: 9999px;

  /* --- motion: Material 3 curves + a duration scale --- */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out:    cubic-bezier(0.65, 0, 0.35, 1);
  --ease-emph-dec:  cubic-bezier(0.05, 0.7, 0.1, 1);
  --ease-emph-acc:  cubic-bezier(0.3, 0, 0.8, 0.15);
  --dur-1: 100ms;  --dur-2: 170ms;  --dur-3: 240ms;  --dur-4: 420ms;  --dur-5: 720ms;

  --star-opacity: 0.5;
  --banner-scrim: linear-gradient(180deg, transparent 42%, var(--surface-1));
  --grain-opacity: 0.028;
  color-scheme: dark;
}

/* ---------- Tokens: light ---------- */
[data-theme="light"] {
  --bg-app:         oklch(0.968 0.006 85);
  --surface-1:      oklch(1 0 0);
  --surface-2:      oklch(0.985 0.006 85);
  --surface-3:      oklch(1 0 0);
  --surface-chip:   oklch(0.55 0.02 85 / 0.09);
  --surface-sunken: oklch(0.955 0.008 85);

  --text-main:      oklch(0.26 0.018 265);
  --text-secondary: oklch(0.455 0.016 265);
  --text-muted:     oklch(0.540 0.014 265);   /* AA on white and on sunken wells */
  --text-inverse:   oklch(0.99 0.003 85);

  --accent:         oklch(0.515 0.145 240);   /* AA on white (5.4:1) and sunken wells */
  --accent-hover:   oklch(0.460 0.145 240);
  --accent-press:   oklch(0.415 0.140 240);
  --accent-subtle:  oklch(0.515 0.145 240 / 0.12);
  --accent-ring:    oklch(0.515 0.145 240 / 0.42);

  --gold:           oklch(0.60 0.140 70);
  --gold-subtle:    oklch(0.60 0.140 70 / 0.13);
  --spark:          oklch(0.58 0.190 350);
  --spark-subtle:   oklch(0.58 0.190 350 / 0.13);
  --verified:       oklch(0.55 0.155 245);
  --success:        oklch(0.53 0.140 160);
  --danger:         oklch(0.52 0.190 20);
  --danger-subtle:  oklch(0.52 0.190 20 / 0.12);

  --line:           oklch(0.30 0.02 265 / 0.12);
  --line-strong:    oklch(0.30 0.02 265 / 0.2);
  --line-focus:     oklch(0.30 0.02 265 / 0.32);
  --edge-highlight: inset 0 1px 0 oklch(1 0 0 / 0.9);

  --sh-1:
    0 1px 2px oklch(0.45 0.03 70 / 0.16),
    0 3px 6px oklch(0.45 0.03 70 / 0.12);
  --sh-2:
    0 2px 4px oklch(0.45 0.03 70 / 0.16),
    0 6px 12px oklch(0.45 0.03 70 / 0.13),
    0 14px 24px oklch(0.45 0.03 70 / 0.10);
  --sh-3:
    0 4px 8px oklch(0.42 0.03 70 / 0.18),
    0 12px 24px oklch(0.42 0.03 70 / 0.15),
    0 28px 48px oklch(0.42 0.03 70 / 0.12);

  --star-opacity: 0;
  --banner-scrim: linear-gradient(180deg, transparent 42%, var(--surface-1));
  --grain-opacity: 0.016;
  color-scheme: light;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scrollbar-gutter: stable; }
body {
  margin: 0;
  background: var(--bg-app);
  color: var(--text-main);
  font: 400 var(--fs-body) / var(--lh-body) var(--font-sans);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  scrollbar-color: color-mix(in oklab, var(--text-muted) 55%, transparent) transparent;
  scrollbar-width: thin;
}
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3 { line-height: var(--lh-tight); letter-spacing: var(--tk-h2); text-wrap: balance; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }

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

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

/* Film grain over the whole page. Keeps large dark fields from banding and adds
   a tactile quality that flat fills lack. Fixed + no pointer events so it never
   repaints on scroll; 0.03 max — higher reads as TV static, which is the tell
   that makes grain look cheap rather than expensive. */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 9998; pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Single ambient wash behind the page rather than per-card glows (per-card
   halos read as 2020-era). Interpolating in oklab avoids the muddy midpoint. */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(70% 46% at 50% -6%, var(--accent-subtle), transparent 68%),
    radial-gradient(48% 34% at 88% 4%, var(--spark-subtle), transparent 72%);
}

#stars {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: var(--star-opacity); transition: opacity var(--dur-4) var(--ease-out-quart);
}

/* ==========================================================================
   Type helpers
   ========================================================================== */
.eyebrow {
  font: 700 var(--fs-micro) / var(--lh-flat) var(--font-mono);
  letter-spacing: var(--tk-caps);
  text-transform: uppercase;
  color: var(--gold);
}
.tnum { font-variant-numeric: tabular-nums; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-app);
  border-bottom: 1px solid var(--line);
  padding: var(--sp-3) clamp(var(--sp-4), 2vw, var(--sp-8));
}
/* Glass is kept to the header alone: it is the one place translucency earns its
   keep (content scrolls beneath it). Everywhere else it hurt readability. */
@supports (backdrop-filter: blur(1px)) {
  .site-header {
    background: color-mix(in oklab, var(--bg-app) 78%, transparent);
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
  }
}
.header-inner {
  display: grid; grid-template-columns: 1fr minmax(0, 30rem) 1fr;
  align-items: center; gap: var(--sp-5); max-width: 1480px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: var(--sp-3); min-width: 0; }
.brand-logo { border-radius: var(--r-sm); }
.brand-text h1 {
  font-size: 1.1875rem; font-weight: 700;
  letter-spacing: var(--tk-card); line-height: 1.15;
}
.brand-sub {
  font: 500 var(--fs-micro) / var(--lh-flat) var(--font-mono);
  color: var(--text-muted); letter-spacing: 0.02em;
}

.header-search { position: relative; }
.header-search input {
  width: 100%;
  padding: 0.68rem 2.6rem 0.68rem 1rem;
  background: var(--surface-sunken);
  border: 1px solid var(--line);
  border-radius: var(--r-full);
  color: var(--text-main);
  transition: border-color var(--dur-2) var(--ease-out-quart),
              box-shadow var(--dur-2) var(--ease-out-quart);
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}
.header-search kbd {
  position: absolute; right: 0.7rem; top: 50%; transform: translateY(-50%);
  font: 600 var(--fs-micro) var(--font-mono); color: var(--text-muted);
  background: var(--surface-chip); padding: 0.18rem 0.4rem; border-radius: var(--r-xs);
}

.header-right { display: flex; align-items: center; gap: var(--sp-2); justify-content: flex-end; }

/* Buttons -------------------------------------------------------------- */
.btn-primary {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 0.6rem 1.1rem; border-radius: var(--r-full);
  background: var(--accent); color: var(--text-inverse);
  font-weight: 700; font-size: var(--fs-sm);
  transition: background var(--dur-2) var(--ease-out-quart),
              transform var(--dur-1) var(--ease-out-quart);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-primary:active { background: var(--accent-press); transform: translateY(0); }
/* Icon buttons carry a real glyph, not an emoji: emoji render per-OS and read
   amateur next to the SVG icons elsewhere in the chrome. */
.btn-ico { width: 1.05em; height: 1.05em; flex: none; }

.btn-outline {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 0.5rem 1rem; border-radius: var(--r-full);
  border: 1px solid var(--line-strong); color: var(--text-secondary);
  font-weight: 600; font-size: var(--fs-sm);
  transition: border-color var(--dur-2) var(--ease-out-quart),
              color var(--dur-2) var(--ease-out-quart),
              background var(--dur-2) var(--ease-out-quart);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }

.btn-ghost {
  padding: 0.45rem 0.75rem; border-radius: var(--r-full);
  color: var(--text-secondary); font-weight: 600; font-size: var(--fs-sm);
  transition: background var(--dur-2) var(--ease-out-quart), color var(--dur-2) var(--ease-out-quart);
}
.btn-ghost:hover { background: var(--surface-chip); color: var(--text-main); }

.icon-btn {
  display: grid; place-items: center; width: 2.5rem; height: 2.5rem;
  border-radius: var(--r-full); border: 1px solid var(--line);
  color: var(--text-secondary);
  transition: border-color var(--dur-2) var(--ease-out-quart),
              color var(--dur-2) var(--ease-out-quart),
              background var(--dur-2) var(--ease-out-quart);
}
.icon-btn:hover { border-color: var(--line-strong); color: var(--text-main); background: var(--surface-chip); }
[data-theme="oled"] .icon-moon, [data-theme="light"] .icon-sun { display: none; }

/* ==========================================================================
   Hero
   ========================================================================== */
main {
  position: relative; z-index: 1;
  max-width: 1480px; margin: 0 auto;
  padding: 0 clamp(var(--sp-4), 2vw, var(--sp-8)) var(--sp-16);
}
.hero { padding: var(--sp-12) 0 var(--sp-8); max-width: 54rem; }
.hero .eyebrow { margin-bottom: var(--sp-4); }
.hero-title {
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: var(--lh-display);
  letter-spacing: var(--tk-display);
}
.hero-tagline { margin-top: var(--sp-3); color: var(--text-secondary); font-size: var(--fs-body); max-width: 60ch; text-wrap: pretty; }
.curator { margin-top: var(--sp-4); font-size: var(--fs-sm); color: var(--text-muted); }

.metrics { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-6); }
.metric {
  display: flex; flex-direction: column; gap: 2px;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-md);
  background: var(--surface-1);
  border: 1px solid var(--line);
  box-shadow: var(--edge-highlight), var(--sh-1);
  min-width: 6.5rem;
}
.metric-value {
  font-size: var(--fs-metric); font-weight: 800;
  letter-spacing: -0.02em; font-variant-numeric: tabular-nums;
}
.metric-label { font-size: var(--fs-micro); color: var(--text-muted); letter-spacing: 0.05em; }

/* ==========================================================================
   Spotlight (今日精选)
   ========================================================================== */
.spotlight {
  position: relative; display: flex; align-items: center; gap: var(--sp-5);
  margin: var(--sp-1) 0 var(--sp-8);
  padding: var(--sp-6);
  border-radius: var(--r-lg);
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  box-shadow: var(--edge-highlight), var(--sh-2);
  overflow: hidden;
}
.spotlight-banner {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0.2; z-index: 0; pointer-events: none;
}
.spotlight::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: var(--banner-scrim); pointer-events: none; opacity: 0.6;
}
.spotlight > *:not(.spotlight-banner) { position: relative; z-index: 2; }
.spotlight-thumb img {
  width: 5.25rem; height: 5.25rem; border-radius: var(--r-full);
  object-fit: cover; border: 2px solid var(--line-strong);
  background: var(--surface-chip);
  box-shadow: var(--sh-2);
}
.spotlight-body { flex: 1; min-width: 0; }
.spotlight-eyebrow { display: flex; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-2); }
.spark {
  font: 700 var(--fs-micro) var(--font-mono);
  letter-spacing: 0.14em; color: var(--spark); text-transform: uppercase;
}
.spotlight-name { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em; }
.spotlight-bio {
  margin-top: var(--sp-2); color: var(--text-secondary);
  font-size: var(--fs-sm); max-width: 70ch; text-wrap: pretty;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.spotlight-actions { display: flex; gap: var(--sp-2); margin-top: var(--sp-4); }

/* ==========================================================================
   Filters
   ========================================================================== */
.filter-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-4); flex-wrap: wrap; padding: var(--sp-2) 0;
}
.pills { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.f-pill {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 0.44rem 0.9rem; border-radius: var(--r-full);
  background: var(--surface-1); border: 1px solid var(--line);
  color: var(--text-secondary); font-size: var(--fs-sm); font-weight: 600;
  transition: border-color var(--dur-2) var(--ease-out-quart),
              color var(--dur-2) var(--ease-out-quart),
              background var(--dur-2) var(--ease-out-quart);
}
.f-pill:hover { border-color: var(--line-strong); color: var(--text-main); }
.f-pill.active {
  background: var(--accent-subtle); border-color: var(--accent);
  color: var(--accent);
}
.f-pill[data-key="tomb"].active {
  background: var(--danger-subtle); border-color: var(--danger); color: var(--danger);
}
.pill-badge {
  font: 600 var(--fs-micro) var(--font-mono);
  padding: 0.06rem 0.38rem; border-radius: var(--r-full);
  background: var(--surface-chip); color: inherit;
  font-variant-numeric: tabular-nums;
}

.view-switch {
  display: flex; gap: 3px; padding: 3px;
  border-radius: var(--r-full);
  background: var(--surface-sunken); border: 1px solid var(--line);
}
.view-switch button {
  width: 2.125rem; height: 1.75rem; border-radius: var(--r-full);
  color: var(--text-muted); font-size: var(--fs-sm);
  transition: background var(--dur-2) var(--ease-out-quart), color var(--dur-2) var(--ease-out-quart);
}
.view-switch button:hover { color: var(--text-main); }
.view-switch button.active { background: var(--accent-subtle); color: var(--accent); }

.meta-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-4); padding: var(--sp-4) 2px var(--sp-5);
}
.result-count {
  font: 500 var(--fs-sm) var(--font-mono);
  color: var(--text-muted); font-variant-numeric: tabular-nums;
}
.sort-wrap select {
  appearance: none;
  padding: 0.5rem 2.1rem 0.5rem 0.9rem;
  border-radius: var(--r-full);
  background: var(--surface-sunken) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23808a99' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 0.85rem center;
  border: 1px solid var(--line);
  font-size: var(--fs-sm); font-weight: 600; color: var(--text-secondary);
  transition: border-color var(--dur-2) var(--ease-out-quart);
}
.sort-wrap select:hover { border-color: var(--line-strong); }

/* ==========================================================================
   Wall / masonry
   ========================================================================== */
.wall { transition: opacity var(--dur-3) var(--ease-out-quart); }
.wall[data-view="grid"]    { display: flex; align-items: flex-start; gap: var(--sp-5); }
.wall[data-view="compact"] { display: flex; align-items: flex-start; gap: var(--sp-4); }
.wall[data-view="list"]    { display: flex; flex-direction: column; gap: var(--sp-3); max-width: 60rem; }
.masonry-column { display: flex; flex-direction: column; gap: var(--sp-5); flex: 1; min-width: 0; }
.wall[data-view="compact"] .masonry-column { gap: var(--sp-4); }

/* ==========================================================================
   Card
   ========================================================================== */
.card {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-1);
  border: 1px solid var(--line);
  box-shadow: var(--edge-highlight), var(--sh-1);
  /* transform only — animating a layered box-shadow is expensive, and only the
     hovered card transitions anyway. Snappier curve than before: 170ms reads
     more premium than 220ms. */
  transition: transform var(--dur-2) var(--ease-out-quart),
              border-color var(--dur-2) var(--ease-out-quart),
              box-shadow var(--dur-2) var(--ease-out-quart);
  isolation: isolate;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--edge-highlight), var(--sh-2);
}
.card:focus-visible { border-color: var(--accent); outline-offset: 3px; }

.card-banner { position: relative; aspect-ratio: 3 / 1; background: var(--surface-chip); overflow: hidden; }
.card-banner img { width: 100%; height: 100%; object-fit: cover; }
.card-banner::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 38%, var(--surface-1));
}
/* banner brightening on hover is a quieter "alive" cue than a glow */
.card-banner img { transition: transform var(--dur-4) var(--ease-out-quart); animation: img-in var(--dur-5) ease both; }
.card:hover .card-banner img { transform: scale(1.03); }

.card-avatar-wrap { position: absolute; left: var(--sp-5); bottom: -1.6rem; z-index: 3; }
.card-avatar {
  width: 4.75rem; height: 4.75rem; border-radius: var(--r-full);
  object-fit: cover; background: var(--surface-chip);
  border: 3px solid var(--surface-1);
  box-shadow: var(--sh-1);
  animation: img-in var(--dur-5) ease both;
}
.verified-badge {
  position: absolute; right: -2px; bottom: -2px;
  width: 1.375rem; height: 1.375rem; border-radius: var(--r-full);
  background: var(--verified); border: 2.5px solid var(--surface-1);
  display: grid; place-items: center; color: #fff;
}
.verified-badge svg { width: 0.75rem; height: 0.75rem; }

.card-body { position: relative; z-index: 2; padding: 2.1rem var(--sp-5) var(--sp-4); }
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--sp-2); }
.card-name {
  font-size: var(--fs-card); font-weight: 700; letter-spacing: var(--tk-card);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.card-handle { font: 500 var(--fs-tiny) var(--font-mono); color: var(--text-muted); white-space: nowrap; }
.card-meta { display: flex; align-items: center; gap: var(--sp-2); margin-top: var(--sp-1); }
.card-influence-pill {
  font: 700 var(--fs-micro) var(--font-mono);
  padding: 0.18rem 0.6rem; border-radius: var(--r-full);
  background: var(--surface-chip); color: var(--text-secondary);
}
.card-influence-pill[data-tier="top"]   { background: var(--gold-subtle); color: var(--gold); }
.card-influence-pill[data-tier="known"] { background: var(--accent-subtle); color: var(--accent); }
.followers {
  font: 600 var(--fs-tiny) var(--font-mono);
  color: var(--text-secondary); font-variant-numeric: tabular-nums;
}
.card-bio {
  margin-top: var(--sp-2); font-size: var(--fs-sm);
  color: var(--text-secondary); line-height: 1.5; text-wrap: pretty;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 2.9em;
}
.card-tags { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-2); }
.card-tag {
  font: 500 var(--fs-micro) var(--font-mono); color: var(--accent);
  padding: 0.18rem 0.5rem; border-radius: var(--r-xs);
  background: var(--accent-subtle);
  max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.card-foot {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-2);
  margin-top: var(--sp-3); padding-top: var(--sp-3);
  border-top: 1px solid var(--line);
  font: 500 var(--fs-micro) var(--font-mono); color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.card-cta {
  color: var(--accent); font-weight: 700;
  font-family: var(--font-sans); font-size: var(--fs-tiny);
}
.card-cta .arrow { display: inline-block; transition: transform var(--dur-2) var(--ease-out-quart); }
.card:hover .card-cta .arrow { transform: translateX(3px); }

/* Compact view */
.wall[data-view="compact"] .card-avatar { width: 3.5rem; height: 3.5rem; }
.wall[data-view="compact"] .card-avatar-wrap { bottom: -1.35rem; left: var(--sp-3); }
.wall[data-view="compact"] .card-body { padding: 1.8rem var(--sp-3) var(--sp-3); }
.wall[data-view="compact"] .card-name { font-size: 0.94rem; }
.wall[data-view="compact"] .card-bio { font-size: var(--fs-micro); }
.wall[data-view="compact"] .card-foot { margin-top: var(--sp-2); padding-top: var(--sp-2); }

/* List view */
.wall[data-view="list"] .card { display: flex; align-items: center; gap: var(--sp-4); padding: var(--sp-4) var(--sp-5); }
.wall[data-view="list"] .card-banner { display: none; }
.wall[data-view="list"] .card-avatar-wrap { position: static; }
.wall[data-view="list"] .card-avatar { width: 3.5rem; height: 3.5rem; border-width: 2px; }
.wall[data-view="list"] .card-body { padding: 0; flex: 1; }
.wall[data-view="list"] .card-bio { -webkit-line-clamp: 1; min-height: 0; margin-top: var(--sp-1); }
.wall[data-view="list"] .card-foot { border-top: 0; margin-top: 0; padding-top: var(--sp-1); }

/* Tombstone (赛博坟场) — desaturated, not hidden */
.card[data-dead="1"] { filter: grayscale(0.62); border-color: var(--danger-subtle); }
.card[data-dead="1"] .card-banner img { opacity: 0.5; }
.card[data-dead="1"] .card-name { color: var(--danger); }
.card[data-dead="1"]:hover { filter: grayscale(0.25); }
.dead-tag {
  position: absolute; top: var(--sp-3); right: var(--sp-3); z-index: 4;
  font: 700 var(--fs-micro) var(--font-mono); letter-spacing: 0.08em;
  padding: 0.22rem 0.55rem; border-radius: var(--r-xs);
  background: color-mix(in oklab, var(--bg-app) 72%, transparent);
  color: var(--danger); border: 1px solid var(--danger);
  backdrop-filter: blur(6px);
}

/* ==========================================================================
   Skeleton (replaces the forever-spinner on a full-grid load)
   ========================================================================== */
.skeleton-card {
  border-radius: var(--r-lg);
  background: var(--surface-1);
  border: 1px solid var(--line);
  overflow: hidden;
}
.sk-banner { aspect-ratio: 3 / 1; }
.sk-avatar {
  width: 4.75rem; height: 4.75rem; border-radius: var(--r-full);
  margin: -1.6rem 0 0 var(--sp-5); border: 3px solid var(--surface-1);
  position: relative; z-index: 2;
}
.sk-body { padding: var(--sp-3) var(--sp-5) var(--sp-5); display: grid; gap: var(--sp-2); }
.sk-line { height: 0.6rem; border-radius: var(--r-xs); }
.sk-line.w-40 { width: 40%; } .sk-line.w-70 { width: 70%; } .sk-line.w-90 { width: 90%; }
.sk-banner, .sk-avatar, .sk-line {
  background: linear-gradient(100deg,
    var(--surface-chip) 30%,
    color-mix(in oklab, var(--surface-chip) 60%, var(--surface-2)) 50%,
    var(--surface-chip) 70%);
  background-size: 220% 100%;
}
.sentinel { display: grid; place-items: center; padding: var(--sp-8) 0; min-height: 3.75rem; }
.sentinel[hidden] { display: none; }
.spinner {
  width: 1.6rem; height: 1.6rem; border-radius: var(--r-full);
  border: 2.5px solid var(--line); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
/* Images fade in via CSS, not a JS load class: a data: URI (the demo dataset)
   can be complete before a load listener is attached, which would strand the
   image at opacity 0. An animation has no such failure mode. */
@keyframes img-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes shimmer { from { background-position: 220% 0 } to { background-position: -20% 0 } }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: 0.55 } }

.empty { text-align: center; padding: var(--sp-16) var(--sp-5); color: var(--text-secondary); display: grid; gap: var(--sp-3); justify-items: center; }
.empty-ico { width: 3rem; height: 3rem; color: var(--text-muted); opacity: 0.6; }
.empty strong { font-size: 1.125rem; color: var(--text-main); }
.empty .btn-outline { margin-top: var(--sp-2); }

/* ==========================================================================
   Modal
   ========================================================================== */
.modal { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: var(--sp-5); }
.modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: color-mix(in oklab, var(--bg-app) 66%, transparent);
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px) saturate(120%);
  animation: fade var(--dur-3) var(--ease-out-quart);
}
@keyframes fade { from { opacity: 0 } }
.modal-card {
  position: relative; width: min(35rem, 100%); max-height: 88vh; overflow: auto;
  overscroll-behavior: contain;
  background: var(--surface-3);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  box-shadow: var(--edge-highlight), var(--sh-3);
  animation: pop var(--dur-4) var(--ease-out-back);
  scrollbar-color: color-mix(in oklab, var(--text-muted) 55%, transparent) transparent;
  scrollbar-width: thin;
}
@keyframes pop { from { opacity: 0; transform: translateY(16px) scale(0.975) } }
.modal-close {
  position: absolute; top: var(--sp-3); right: var(--sp-3); z-index: 4;
  width: 2.125rem; height: 2.125rem; border-radius: var(--r-full);
  background: color-mix(in oklab, var(--bg-app) 55%, transparent);
  color: var(--text-main); backdrop-filter: blur(8px);
  transition: background var(--dur-2) var(--ease-out-quart);
}
.modal-close:hover { background: var(--surface-chip); }
.modal-hero { position: relative; aspect-ratio: 3 / 1; background: var(--surface-chip); overflow: hidden; }
.modal-hero img { width: 100%; height: 100%; object-fit: cover; }
.modal-hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, var(--surface-3));
}
.modal-pad { padding: 0 var(--sp-6) var(--sp-6); }
.modal-avatar {
  width: 5.75rem; height: 5.75rem; border-radius: var(--r-full); object-fit: cover;
  margin-top: -2.9rem; border: 4px solid var(--surface-3);
  position: relative; z-index: 2; background: var(--surface-chip);
  box-shadow: var(--sh-1);
}
.modal-name { margin-top: var(--sp-3); font-size: 1.4rem; font-weight: 800; letter-spacing: -0.022em; }
.modal-handle { font: 500 var(--fs-sm) var(--font-mono); color: var(--text-muted); }
.modal-bio { margin-top: var(--sp-3); color: var(--text-secondary); font-size: var(--fs-sm); white-space: pre-wrap; text-wrap: pretty; }
.modal-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-2); margin-top: var(--sp-4); }
.modal-cell {
  padding: var(--sp-3) var(--sp-4); border-radius: var(--r-md);
  background: var(--surface-1); border: 1px solid var(--line);
}
.modal-cell span { display: block; font-size: var(--fs-micro); color: var(--text-muted); }
.modal-cell b { font-size: 1.05rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.modal-actions { display: flex; gap: var(--sp-2); margin-top: var(--sp-4); }
.modal-links { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-3); }

/* ---------- Timeline (时光档案) ---------- */
.timeline { margin-top: var(--sp-5); border-top: 1px solid var(--line); padding-top: var(--sp-4); }
.timeline-title {
  display: flex; align-items: baseline; gap: var(--sp-2);
  font-size: var(--fs-sm); font-weight: 700; letter-spacing: 0.02em;
  color: var(--text-secondary); margin: 0 0 var(--sp-3);
}
.timeline-count { font: 500 var(--fs-micro) var(--font-mono); color: var(--text-muted); }
.timeline-list { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline-item {
  display: grid; grid-template-columns: 4.75rem 0.9rem 1fr; align-items: start; gap: var(--sp-2);
  padding: 0.32rem 0; position: relative; font-size: var(--fs-tiny);
}
.timeline-item:not(:last-child) .timeline-dot::after {
  content: ""; position: absolute; left: 50%; top: 0.85rem; bottom: -0.32rem;
  width: 1px; transform: translateX(-50%); background: var(--line);
}
.timeline-time { font: 500 var(--fs-micro) var(--font-mono); color: var(--text-muted); padding-top: 1px; font-variant-numeric: tabular-nums; }
.timeline-dot {
  position: relative; width: 0.55rem; height: 0.55rem; margin-top: 0.26rem;
  border-radius: var(--r-full); background: var(--text-muted); justify-self: center;
}
.timeline-item[data-event="added"]    .timeline-dot { background: var(--success); }
.timeline-item[data-event="archived"] .timeline-dot { background: var(--danger); }
.timeline-item[data-event="restored"] .timeline-dot { background: var(--accent); }
.timeline-item[data-event="updated"]  .timeline-dot { background: var(--gold); }
.timeline-body { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.timeline-label { font-weight: 700; color: var(--text-main); }
.timeline-detail { color: var(--text-secondary); }

/* ==========================================================================
   Footer / to-top
   ========================================================================== */
.site-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--line);
  padding: var(--sp-8) clamp(var(--sp-4), 2vw, var(--sp-8));
  text-align: center; color: var(--text-muted); font-size: var(--fs-sm);
}
.footer-meta { margin-top: var(--sp-2); font: 500 var(--fs-micro) var(--font-mono); font-variant-numeric: tabular-nums; }
.to-top {
  position: fixed; right: var(--sp-5); bottom: var(--sp-5); z-index: 90;
  width: 2.875rem; height: 2.875rem; border-radius: var(--r-full);
  background: var(--surface-3); border: 1px solid var(--line-strong);
  color: var(--text-main); font-size: 1.1rem;
  box-shadow: var(--edge-highlight), var(--sh-2);
  transition: transform var(--dur-2) var(--ease-out-quart),
              border-color var(--dur-2) var(--ease-out-quart);
}
.to-top:hover { transform: translateY(-3px); border-color: var(--accent); }

/* ==========================================================================
   Card entrance (first screenful only; appended cards fade without stagger)
   ========================================================================== */
@keyframes card-in {
  from { opacity: 0; transform: translateY(14px) }
  to   { opacity: 1; transform: none }
}
.card.enter {
  animation: card-in var(--dur-4) var(--ease-out-expo) both;
  /* stagger 45ms, capped at 9 steps so late cards are not seconds behind */
  animation-delay: calc(min(var(--i, 0), 9) * 45ms);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1280px) { .header-inner { grid-template-columns: 1fr minmax(0, 22rem) 1fr; } }
@media (max-width: 1024px) { .hero { padding-top: var(--sp-10); } }
@media (max-width: 768px) {
  .site-header { padding: var(--sp-2) var(--sp-4); }
  .header-inner { grid-template-columns: auto 1fr; gap: var(--sp-3); }
  .brand-sub, .header-search kbd { display: none; }
  .header-right { grid-column: 2; }
  .btn-label { display: none; }
  main { padding: 0 var(--sp-4) var(--sp-12); }
  .spotlight { flex-direction: column; align-items: flex-start; }
  .metrics { display: grid; grid-template-columns: repeat(3, 1fr); }
  .metric { min-width: 0; padding: var(--sp-2) var(--sp-3); }
}
@media (max-width: 640px) {
  .wall[data-view="grid"], .masonry-column { gap: var(--sp-3); }
  .card-body { padding: 1.9rem var(--sp-3) var(--sp-3); }
  .card-avatar-wrap { left: var(--sp-3); }
  .card-avatar { width: 4rem; height: 4rem; }
}
@media (hover: none) {
  /* hover-only affordances are invisible on touch */
  .card:hover { transform: none; }
}

/* ==========================================================================
   Reduced motion — REPLACE motion, don't merely shorten it.
   (The previous rule clamped durations to .01ms with !important, which is not
   what the preference asks for: large motion should become non-motion, not
   become instant.)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .card.enter { animation: fade-only var(--dur-3) ease both; animation-delay: 0ms; }
  .card:hover { transform: none; }
  .card:hover .card-banner img { transform: none; }
  .card:hover .card-cta .arrow { transform: none; }
  .modal-card { animation: fade-only var(--dur-3) ease both; }
  .sk-banner, .sk-avatar, .sk-line { animation: pulse 2.4s ease-in-out infinite; background: var(--surface-chip); }
  .spinner { animation: none; border-top-color: var(--accent); }
  #stars { display: none; }
}
@keyframes fade-only { from { opacity: 0 } to { opacity: 1 } }

/* Animations for shimmer/pulse only run when motion is welcome */
@media (prefers-reduced-motion: no-preference) {
  .sk-banner, .sk-avatar, .sk-line { animation: shimmer 1.6s linear infinite; }
}