/* ==========================================================================
   IM AL IMRAN S — style.css  (v2)
   Same hand-coded, framework-free design system as before, expanded with:
   article/reading-experience components, blog listing, author card, share
   popup, TOC, code blocks, callouts, lightbox, and legal/404 page styles.

   1.  Design tokens          8.  Glass panels & window-chrome cards
   2.  Reset & base           9.  Hero
   3.  Typography            10.  Section-specific (social, cards, filters…)
   4.  Layout utilities       11.  Blog listing & post-reading experience
   5.  Accessibility helpers  12.  Footer
   6.  Header & navigation    13.  Animations & motion
   7.  Buttons & forms        14.  Responsive / reduced-motion / print
   ========================================================================== */

/* ---------- 1. Design tokens ------------------------------------------- */
:root {
  --ink: #0b0f17;
  --ink-raised: #111726;
  --surface: #131a2b;
  --surface-2: #1a2237;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text-primary: #f3f4f7;
  --text-secondary: #9aa3b5;
  --text-tertiary: #6b7386;

  --signal: #5b5ef4;
  --signal-strong: #7375ff;
  --pulse: #22c3a6;
  --spark: #f2a93b;
  --danger: #f26161;

  --gradient-signal: linear-gradient(135deg, var(--signal) 0%, var(--pulse) 100%);
  --gradient-warm: linear-gradient(135deg, var(--spark) 0%, #ef7a5f 100%);
  --gradient-mesh: radial-gradient(circle at 15% 20%, rgba(91, 94, 244, 0.25), transparent 45%),
                    radial-gradient(circle at 85% 15%, rgba(34, 195, 166, 0.2), transparent 40%),
                    radial-gradient(circle at 50% 90%, rgba(242, 169, 59, 0.12), transparent 45%);

  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.45);
  --glow-signal: 0 0 0 1px rgba(91, 94, 244, 0.4), 0 8px 24px rgba(91, 94, 244, 0.25);

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-full: 999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 150ms;
  --t-med: 280ms;
  --t-slow: 500ms;

  --container-w: 1180px;
  --header-h: 76px;
  --progress-h: 3px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6.5rem;

  color-scheme: dark;
}

[data-theme="light"] {
  --ink: #f7f7f4;
  --ink-raised: #ffffff;
  --surface: #ffffff;
  --surface-2: #f0f1f5;
  --border: rgba(15, 23, 42, 0.09);
  --border-strong: rgba(15, 23, 42, 0.16);
  --text-primary: #12172a;
  --text-secondary: #565d6d;
  --text-tertiary: #7a8092;
  --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
  color-scheme: light;
}

/* ---------- 2. Reset & base --------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + var(--progress-h) + 16px); }
body {
  background: var(--ink);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--t-med) var(--ease), color var(--t-med) var(--ease);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; height: auto; }
svg { display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; background: none; border: none; }
button { cursor: pointer; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--signal-strong); outline-offset: 3px; border-radius: var(--r-sm); }
[inert] { display: none; }

/* ---------- 3. Typography ------------------------------------------------ */
h1, h2, h3, h4 { font-weight: 800; line-height: 1.15; letter-spacing: -0.03em; color: var(--text-primary); }
h1 { font-size: clamp(2.3rem, 4.5vw + 1rem, 4rem); letter-spacing: -0.04em; }
h2 { font-size: clamp(1.8rem, 3vw + 1rem, 2.6rem); }
h3 { font-size: clamp(1.25rem, 1.5vw + 1rem, 1.5rem); }
h4 { font-size: 1.05rem; letter-spacing: -0.01em; }
p { color: var(--text-secondary); }
.lede { font-size: clamp(1.05rem, 1vw + 0.9rem, 1.25rem); color: var(--text-secondary); max-width: 60ch; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;
  color: var(--pulse); letter-spacing: 0.01em; margin-bottom: var(--space-2);
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--pulse);
  box-shadow: 0 0 0 3px rgba(34, 195, 166, 0.18); flex-shrink: 0;
}
.mono { font-family: var(--font-mono); }
.section-head { max-width: 640px; margin-bottom: var(--space-4); }
.section-head p { margin-top: var(--space-2); }
.gradient-text { background: var(--gradient-signal); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 4. Layout ----------------------------------------------------- */
.container { width: 100%; max-width: var(--container-w); margin-inline: auto; padding-inline: var(--space-3); }
.container-narrow { max-width: 760px; }
main { display: block; }
section { padding-block: var(--space-6); }
.section-alt { background: var(--ink-raised); border-block: 1px solid var(--border); }
.grid { display: grid; gap: var(--space-3); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.flex { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.stack { display: flex; flex-direction: column; }
.gap-1 { gap: var(--space-1); } .gap-2 { gap: var(--space-2); } .gap-3 { gap: var(--space-3); }

.breadcrumb { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-tertiary); padding-top: var(--space-3); display: flex; flex-wrap: wrap; align-items: center; }
.breadcrumb a { color: var(--text-secondary); transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover, .breadcrumb a:focus-visible { color: var(--pulse); }
.breadcrumb .sep { margin-inline: 0.5em; color: var(--text-tertiary); }
.breadcrumb [aria-current="page"] { color: var(--text-secondary); }

/* ---------- 5. Accessibility helpers -------------------------------------- */
.sr-only { 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: absolute; top: -60px; left: var(--space-2); z-index: 1000;
  background: var(--signal); color: #fff; padding: 0.75em 1.25em; border-radius: var(--r-sm);
  font-weight: 600; transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: var(--space-2); }

/* ---------- 6. Header & navigation ---------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(11, 15, 23, 0.7); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-med) var(--ease), background var(--t-med) var(--ease);
}
[data-theme="light"] .site-header { background: rgba(247, 247, 244, 0.75); }
.site-header.is-scrolled { border-bottom-color: var(--border); }
/* When a reading-progress bar is present, push the header down so it doesn't overlap */
.has-progress .site-header { top: var(--progress-h); }

.header-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.brand { display: flex; align-items: center; gap: 0.6em; font-weight: 800; font-size: 1.05rem; letter-spacing: -0.01em; }
.brand-mark {
  width: 34px; height: 34px; border-radius: var(--r-sm); background: var(--gradient-signal);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.brand-mark svg { width: 18px; height: 18px; }
.brand-name { font-family: var(--font-mono); font-size: 0.95rem; }

.main-nav ul { display: flex; gap: var(--space-4); }
.nav-link { position: relative; font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); padding-block: 0.4em; transition: color var(--t-fast) var(--ease); }
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 100%; height: 2px;
  background: var(--gradient-signal); transform: scaleX(0); transform-origin: left; transition: transform var(--t-fast) var(--ease);
}
.nav-link:hover, .nav-link:focus-visible { color: var(--text-primary); }
.nav-link:hover::after, .nav-link:focus-visible::after, .nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--text-primary); }

.header-actions { display: flex; align-items: center; gap: var(--space-1); }
.icon-btn { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: var(--r-sm); color: var(--text-secondary); transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease); }
.icon-btn:hover, .icon-btn:focus-visible { background: var(--surface-2); color: var(--text-primary); }
.icon-btn svg { width: 20px; height: 20px; }
.nav-toggle { display: none; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }
#icon-sun, [data-theme="light"] #icon-moon { display: none; }
[data-theme="light"] #icon-sun { display: block; }

.mobile-nav-panel { display: none; }

/* Reading progress bar — fixed strip above the sticky header */
.reading-progress-track {
  position: fixed; top: 0; left: 0; right: 0; height: var(--progress-h);
  background: var(--surface-2); z-index: 101;
}
.reading-progress-bar { height: 100%; width: 0%; background: var(--gradient-signal); transition: width 80ms linear; }

/* ---------- 7. Buttons & form controls ------------------------------------ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5em; padding: 0.85em 1.6em; border-radius: var(--r-full); font-weight: 600; font-size: 0.95rem; white-space: nowrap; transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease); }
.btn-primary { background: var(--gradient-signal); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover, .btn-primary:focus-visible { transform: translateY(-2px); box-shadow: var(--glow-signal); }
.btn-ghost { background: var(--surface); border: 1px solid var(--border-strong); color: var(--text-primary); }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--signal-strong); transform: translateY(-2px); }
.btn-sm { padding: 0.6em 1.2em; font-size: 0.85rem; }
.btn svg { width: 16px; height: 16px; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none !important; }

.field { display: flex; flex-direction: column; gap: 0.5em; margin-bottom: var(--space-3); }
.field label { font-size: 0.88rem; font-weight: 600; color: var(--text-primary); }
.field .req { color: var(--spark); }
.field input, .field textarea { background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-md); padding: 0.85em 1em; font-size: 0.95rem; color: var(--text-primary); transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease); }
.field input::placeholder, .field textarea::placeholder { color: var(--text-tertiary); }
.field input:focus, .field textarea:focus { border-color: var(--signal); box-shadow: 0 0 0 4px rgba(91,94,244,0.15); outline: none; }
.field textarea { resize: vertical; min-height: 140px; }
.field-error { font-size: 0.82rem; color: var(--danger); min-height: 1.2em; }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: var(--danger); }
.form-status { border-radius: var(--r-md); padding: 1em 1.2em; font-size: 0.9rem; margin-top: var(--space-2); }
.form-status[data-state="success"] { background: rgba(34,195,166,0.12); border: 1px solid rgba(34,195,166,0.35); color: var(--pulse); }
.form-status[data-state="error"] { background: rgba(242,97,97,0.1); border: 1px solid rgba(242,97,97,0.35); color: var(--danger); }
.form-status[hidden] { display: none; }

/* ---------- 8. Glass panels & window-chrome cards -------------------------- */
.glass { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); box-shadow: var(--shadow-md); }
.win { border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--surface); overflow: hidden; transition: transform var(--t-med) var(--ease), border-color var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease); }
.win:hover, .win:focus-within { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow-lg); }
.win-bar { display: flex; align-items: center; gap: var(--space-2); padding: 0.7em 1em; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.win-dots { display: flex; gap: 6px; flex-shrink: 0; }
.win-dots span { width: 9px; height: 9px; border-radius: 50%; opacity: 0.85; }
.win-dots span:nth-child(1) { background: var(--spark); }
.win-dots span:nth-child(2) { background: var(--pulse); }
.win-dots span:nth-child(3) { background: var(--signal); }
.win-path { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-tertiary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.win-body { padding: var(--space-3); }

/* ---------- 9. Hero -------------------------------------------------------- */
.hero { position: relative; padding-top: clamp(var(--space-5), 8vw, 7rem); padding-bottom: var(--space-6); overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: -10% -10% auto -10%; height: 140%; background: var(--gradient-mesh); animation: drift 18s ease-in-out infinite alternate; pointer-events: none; z-index: 0; }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: var(--space-5); align-items: center; }
.hero-stats { display: flex; gap: var(--space-4); margin-top: var(--space-4); padding-top: var(--space-3); border-top: 1px solid var(--border); }
.hero-stat .num { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 700; color: var(--text-primary); display: block; }
.hero-stat .label { font-size: 0.78rem; color: var(--text-tertiary); }
.hero-role { font-family: var(--font-mono); font-size: clamp(1rem, 1.4vw + 0.6rem, 1.3rem); color: var(--pulse); margin-block: var(--space-2) var(--space-3); min-height: 1.6em; }
.hero-role .cursor { display: inline-block; width: 0.55em; background: var(--pulse); margin-left: 2px; animation: blink 1s steps(1) infinite; }
.hero-actions { display: flex; gap: var(--space-2); margin-top: var(--space-4); flex-wrap: wrap; }
.hero-social { display: flex; gap: 0.6em; margin-top: var(--space-4); }
.hero-visual { position: relative; justify-self: center; width: 100%; max-width: 340px; }
.avatar-frame .win-body { padding: var(--space-4) var(--space-3) var(--space-3); display: flex; flex-direction: column; align-items: center; text-align: center; gap: 0.75em; }
.avatar-img { width: 160px; height: 160px; border-radius: 50%; object-fit: cover; border: 3px solid var(--border-strong); aspect-ratio: 1/1; }
.avatar-name { font-weight: 700; }
.avatar-role { font-size: 0.85rem; color: var(--text-tertiary); }
.avatar-badge { position: absolute; bottom: -14px; right: -14px; background: var(--gradient-warm); color: #1a1204; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; padding: 0.5em 0.9em; border-radius: var(--r-full); box-shadow: var(--shadow-md); transform: rotate(-4deg); }

/* ---------- 10. Section-specific -------------------------------------------- */
.social-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-2); }
.social-card { display: flex; flex-direction: column; align-items: center; gap: 0.6em; padding: var(--space-3) var(--space-2); border-radius: var(--r-md); border: 1px solid var(--border); background: var(--surface); text-align: center; transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease); }
.social-card:hover, .social-card:focus-visible { transform: translateY(-5px) scale(1.03); border-color: var(--signal-strong); background: var(--surface-2); }
.social-card .icon-wrap { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--surface-2); color: var(--text-primary); transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease); }
.social-card:hover .icon-wrap { background: var(--gradient-signal); color: #fff; }
.social-card .icon-wrap svg { width: 20px; height: 20px; }
.social-card .platform { font-size: 0.82rem; font-weight: 600; }
.social-card .handle { font-size: 0.72rem; color: var(--text-tertiary); font-family: var(--font-mono); }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.project-card .win-body, .post-card .win-body { display: flex; flex-direction: column; gap: 0.75em; height: 100%; }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.4em; margin-top: 0.25em; }
.tag { font-family: var(--font-mono); font-size: 0.72rem; padding: 0.3em 0.7em; border-radius: var(--r-full); background: var(--surface-2); color: var(--text-secondary); border: 1px solid var(--border); transition: all var(--t-fast) var(--ease); }
a.tag:hover, a.tag:focus-visible { border-color: var(--signal-strong); color: var(--text-primary); }
.card-cta { margin-top: auto; padding-top: 0.75em; display: flex; gap: 0.6em; }
.card-cta a, .card-cta span { font-size: 0.85rem; font-weight: 600; color: var(--signal-strong); display: inline-flex; align-items: center; gap: 0.3em; }
.card-cta svg { width: 14px; height: 14px; }
.view-all { display: flex; justify-content: center; margin-top: var(--space-4); }

.filter-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-4); }
.filter-chips { display: flex; flex-wrap: wrap; gap: 0.5em; }
.chip { padding: 0.55em 1.1em; border-radius: var(--r-full); border: 1px solid var(--border-strong); background: var(--surface); font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); transition: all var(--t-fast) var(--ease); }
.chip[aria-pressed="true"] { background: var(--gradient-signal); border-color: transparent; color: #fff; }
.chip:hover { border-color: var(--signal-strong); }
.search-wrap { position: relative; min-width: 240px; flex: 1; max-width: 320px; }
.search-wrap svg { position: absolute; left: 1em; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--text-tertiary); pointer-events: none; }
.search-wrap input { width: 100%; padding-left: 2.6em; background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-full); padding-block: 0.7em; padding-right: 1em; font-size: 0.9rem; color: var(--text-primary); }
.search-wrap input:focus { border-color: var(--signal); outline: none; }
.empty-state { text-align: center; padding: var(--space-5) var(--space-2); color: var(--text-tertiary); display: none; }
.empty-state.is-visible { display: block; }

.timeline { position: relative; padding-left: var(--space-4); border-left: 2px solid var(--border); }
.timeline-item { position: relative; padding-bottom: var(--space-4); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before { content: ""; position: absolute; left: calc(-1 * var(--space-4) - 6px); top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--ink); border: 2px solid var(--pulse); }
.timeline-date { font-family: var(--font-mono); font-size: 0.78rem; color: var(--pulse); margin-bottom: 0.3em; display: block; }

.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
.skill-group h3 { font-size: 1rem; margin-bottom: var(--space-2); font-family: var(--font-mono); color: var(--text-primary); }
.skill-pills { display: flex; flex-wrap: wrap; gap: 0.5em; }
.skill-pill { padding: 0.5em 1em; border-radius: var(--r-sm); background: var(--surface); border: 1px solid var(--border); font-size: 0.85rem; font-weight: 500; }

.mv-grid { grid-template-columns: repeat(2, 1fr); }
.mv-card { padding: var(--space-4); }
.mv-card .icon-wrap { width: 48px; height: 48px; border-radius: var(--r-md); background: var(--gradient-signal); display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-2); }
.mv-card .icon-wrap svg { width: 22px; height: 22px; color: #fff; }

.faq-item { border-bottom: 1px solid var(--border); padding-block: var(--space-2); }
.faq-item summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); font-weight: 600; padding-block: 0.4em; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .chev { width: 18px; height: 18px; color: var(--text-tertiary); transition: transform var(--t-fast) var(--ease); flex-shrink: 0; }
.faq-item[open] summary .chev { transform: rotate(45deg); }
.faq-item p { margin-top: 0.6em; }

.contact-grid { grid-template-columns: 1.1fr 0.9fr; align-items: start; }
.contact-info-card { padding: var(--space-4); }
.copy-email-row { display: flex; align-items: center; gap: 0.6em; margin-top: var(--space-2); flex-wrap: wrap; }
.copy-email-row .email-text { font-family: var(--font-mono); font-size: 0.95rem; color: var(--text-primary); }
.copy-toast { font-size: 0.78rem; color: var(--pulse); opacity: 0; transition: opacity var(--t-fast) var(--ease); }
.copy-toast.is-visible { opacity: 1; }
.location-row { display: flex; align-items: center; gap: 0.6em; margin-top: var(--space-3); color: var(--text-secondary); font-size: 0.92rem; }
.location-row svg { width: 18px; height: 18px; color: var(--pulse); flex-shrink: 0; }
.contact-social-row { display: flex; gap: 0.6em; margin-top: var(--space-3); flex-wrap: wrap; }
.contact-social-row a { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--surface-2); border: 1px solid var(--border); transition: all var(--t-fast) var(--ease); }
.contact-social-row a:hover { background: var(--gradient-signal); transform: translateY(-3px); }
.contact-social-row svg { width: 18px; height: 18px; }

.cta-band { border-radius: var(--r-lg); background: var(--gradient-signal); padding: var(--space-5) var(--space-4); text-align: center; position: relative; overflow: hidden; }
.cta-band h2, .cta-band p { color: #fff; }
.cta-band p { color: rgba(255,255,255,0.85); max-width: 50ch; margin-inline: auto; }
.cta-band .btn-ghost { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.3); color: #fff; }
.cta-band .btn-ghost:hover { border-color: #fff; }

/* ---------- 11. Blog listing & post-reading experience --------------------- */
.blog-hero-grid { grid-template-columns: 1fr; gap: var(--space-2); }
.blog-listing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.blog-card-image { aspect-ratio: 16/9; overflow: hidden; }
.blog-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-med) var(--ease); }
.win:hover .blog-card-image img { transform: scale(1.05); }
.blog-card-meta { display: flex; gap: 0.75em; align-items: center; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); flex-wrap: wrap; }
.category-badge { display: inline-flex; align-items: center; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; color: var(--pulse); background: rgba(34,195,166,0.1); border: 1px solid rgba(34,195,166,0.3); padding: 0.3em 0.8em; border-radius: var(--r-full); text-transform: uppercase; letter-spacing: 0.03em; }

/* Post header */
.post-header { max-width: 760px; }
.post-header h1 { margin-top: var(--space-2); }
.post-header .lede { margin-top: var(--space-2); }

.author-card { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-4); padding: var(--space-2) var(--space-3); border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--surface); flex-wrap: wrap; }
.author-card-link { display: flex; align-items: center; gap: 0.8em; }
.author-avatar { width: 52px; height: 52px; border-radius: 50%; object-fit: cover; flex-shrink: 0; border: 2px solid var(--border-strong); transition: transform var(--t-fast) var(--ease); }
.author-card-link:hover .author-avatar { transform: scale(1.06); }
.author-name { font-weight: 700; transition: color var(--t-fast) var(--ease); }
.author-card-link:hover .author-name { color: var(--pulse); }
.author-meta { display: flex; flex-wrap: wrap; gap: 0.5em 1em; font-size: 0.78rem; color: var(--text-tertiary); margin-top: 0.2em; }
.author-card .share-btn { margin-left: auto; }

/* Featured image */
.featured-image { border-radius: var(--r-lg); overflow: hidden; margin-block: var(--space-4); border: 1px solid var(--border); }
.featured-image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }

/* Post body layout: TOC sidebar + article */
.post-layout { grid-template-columns: 220px 1fr; gap: var(--space-5); align-items: start; }
.toc-wrap { position: sticky; top: calc(var(--header-h) + var(--progress-h) + var(--space-3)); }
.toc-wrap h2 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-tertiary); font-family: var(--font-mono); margin-bottom: var(--space-2); font-weight: 700; }
.toc-list { border-left: 2px solid var(--border); }
.toc-list li { margin: 0; }
.toc-list a { display: block; padding: 0.4em 0 0.4em 1em; font-size: 0.85rem; color: var(--text-tertiary); border-left: 2px solid transparent; margin-left: -2px; transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease); }
.toc-list li.toc-sub a { padding-left: 2em; font-size: 0.8rem; }
.toc-list a:hover, .toc-list a:focus-visible { color: var(--text-primary); }
.toc-list a.is-active { color: var(--pulse); border-left-color: var(--pulse); font-weight: 600; }

/* Article typography */
.article-content { max-width: 720px; }
.article-content > * + * { margin-top: 1.15em; }
.article-content h2 { margin-top: 2em; scroll-margin-top: calc(var(--header-h) + var(--progress-h) + 20px); }
.article-content h3 { margin-top: 1.6em; scroll-margin-top: calc(var(--header-h) + var(--progress-h) + 20px); }
.article-content p, .article-content li { color: var(--text-secondary); font-size: 1.05rem; }
.article-content ul, .article-content ol { padding-left: 1.4em; }
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content a:not(.tag) { color: var(--signal-strong); text-decoration: underline; text-underline-offset: 2px; }
.article-content strong { color: var(--text-primary); }
.article-content img { border-radius: var(--r-md); cursor: zoom-in; }

blockquote { border-left: 4px solid var(--signal-strong); padding: 0.4em 1.3em; font-style: italic; color: var(--text-primary); font-size: 1.1rem; background: var(--surface); border-radius: 0 var(--r-md) var(--r-md) 0; }
blockquote cite { display: block; margin-top: 0.5em; font-style: normal; font-size: 0.82rem; color: var(--text-tertiary); }

.callout { display: flex; gap: 0.8em; padding: 1em 1.2em; border-radius: var(--r-md); border: 1px solid var(--border); background: var(--surface); border-left: 4px solid var(--signal); }
.callout svg { width: 22px; height: 22px; flex-shrink: 0; margin-top: 0.1em; color: var(--signal-strong); }
.callout p { margin: 0 !important; color: var(--text-secondary); font-size: 0.98rem; }
.callout strong { display: block; color: var(--text-primary); margin-bottom: 0.2em; }
.callout-tip { border-left-color: var(--pulse); }
.callout-tip svg { color: var(--pulse); }
.callout-warning { border-left-color: var(--spark); }
.callout-warning svg { color: var(--spark); }

/* Code blocks */
.code-block { border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--border); background: #0d1220; }
.code-block-header { display: flex; align-items: center; justify-content: space-between; padding: 0.6em 1em; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.code-block-header span { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-tertiary); }
.copy-code-btn { display: flex; align-items: center; gap: 0.4em; font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); padding: 0.3em 0.7em; border-radius: var(--r-sm); transition: all var(--t-fast) var(--ease); }
.copy-code-btn:hover { background: var(--surface); color: var(--text-primary); }
.copy-code-btn svg { width: 14px; height: 14px; }
.code-block pre { padding: 1.1em 1.2em; overflow-x: auto; }
.code-block code { font-family: var(--font-mono); font-size: 0.88rem; color: #d7dee9; line-height: 1.6; }

/* Responsive tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-md); }
.article-content table { width: 100%; border-collapse: collapse; min-width: 480px; font-size: 0.92rem; }
.article-content th, .article-content td { padding: 0.75em 1em; text-align: left; border-bottom: 1px solid var(--border); }
.article-content th { background: var(--surface-2); font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--text-tertiary); }
.article-content tr:last-child td { border-bottom: none; }

/* Tags, prev/next, related */
.post-tags { display: flex; flex-wrap: wrap; gap: 0.5em; margin-top: var(--space-4); }
.prev-next-grid { grid-template-columns: 1fr 1fr; margin-top: var(--space-5); }
.prev-next-card { padding: var(--space-3); display: flex; flex-direction: column; gap: 0.4em; }
.prev-next-card .direction { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); display: flex; align-items: center; gap: 0.3em; }
.prev-next-card.next { text-align: right; }
.prev-next-card.next .direction { justify-content: flex-end; }
.prev-next-card h3 { font-size: 1rem; }

.related-grid { margin-top: var(--space-3); }

.author-bio { display: flex; gap: var(--space-3); align-items: flex-start; padding: var(--space-4); flex-wrap: wrap; }
.author-bio .author-avatar { width: 76px; height: 76px; }
.author-bio-content { flex: 1; min-width: 220px; }
.author-bio-content h3 { margin-bottom: 0.3em; }
.author-bio-social { display: flex; gap: 0.5em; margin-top: var(--space-2); }
.author-bio-social a { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--surface-2); border: 1px solid var(--border); transition: all var(--t-fast) var(--ease); }
.author-bio-social a:hover { background: var(--gradient-signal); transform: translateY(-2px); }
.author-bio-social svg { width: 16px; height: 16px; }

/* Share button + popup */
.share-btn { display: inline-flex; align-items: center; gap: 0.5em; padding: 0.6em 1.1em; border-radius: var(--r-full); background: var(--surface-2); border: 1px solid var(--border-strong); font-size: 0.85rem; font-weight: 600; transition: all var(--t-fast) var(--ease); }
.share-btn:hover { border-color: var(--signal-strong); }
.share-btn svg { width: 16px; height: 16px; }

.share-popup-backdrop { position: fixed; inset: 0; background: rgba(5,7,12,0.6); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); z-index: 200; display: flex; align-items: flex-end; justify-content: center; opacity: 0; pointer-events: none; transition: opacity var(--t-med) var(--ease); }
.share-popup-backdrop.is-open { opacity: 1; pointer-events: auto; }
@media (min-width: 640px) { .share-popup-backdrop { align-items: center; } }
.share-popup { background: var(--ink-raised); border: 1px solid var(--border-strong); border-radius: var(--r-lg) var(--r-lg) 0 0; padding: var(--space-3); width: 100%; max-width: 420px; transform: translateY(30px); transition: transform var(--t-med) var(--ease); box-shadow: var(--shadow-lg); }
@media (min-width: 640px) { .share-popup { border-radius: var(--r-lg); } }
.share-popup-backdrop.is-open .share-popup { transform: translateY(0); }
.share-popup-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-2); }
.share-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6em; margin-top: var(--space-2); }
.share-option { display: flex; flex-direction: column; align-items: center; gap: 0.5em; padding: var(--space-2) 0.5em; border-radius: var(--r-md); background: var(--surface); border: 1px solid var(--border); font-size: 0.78rem; font-weight: 600; transition: all var(--t-fast) var(--ease); }
.share-option:hover { border-color: var(--signal-strong); transform: translateY(-2px); }
.share-option .icon-wrap { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--surface-2); }
.share-option svg { width: 18px; height: 18px; }
.share-copy-row { display: flex; gap: 0.5em; margin-top: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--border); }
.share-copy-row input { flex: 1; background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-sm); padding: 0.6em 0.8em; font-size: 0.8rem; font-family: var(--font-mono); color: var(--text-secondary); }

/* Lightbox */
.lightbox-backdrop { position: fixed; inset: 0; background: rgba(5,7,12,0.92); z-index: 300; display: flex; align-items: center; justify-content: center; padding: var(--space-3); opacity: 0; pointer-events: none; transition: opacity var(--t-med) var(--ease); }
.lightbox-backdrop.is-open { opacity: 1; pointer-events: auto; }
.lightbox-backdrop img { max-width: 100%; max-height: 88vh; border-radius: var(--r-md); box-shadow: var(--shadow-lg); }
.lightbox-close { position: absolute; top: var(--space-3); right: var(--space-3); width: 44px; height: 44px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center; color: #fff; }
.lightbox-close svg { width: 20px; height: 20px; }

/* Legal pages (privacy/terms) reuse .article-content typography */
.legal-updated { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-tertiary); margin-top: var(--space-1); }

/* 404 page */
.error-page { min-height: 60vh; display: flex; align-items: center; justify-content: center; text-align: center; }
.error-code { font-family: var(--font-mono); font-size: clamp(4rem, 12vw, 8rem); font-weight: 800; background: var(--gradient-signal); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1; }
.error-terminal { display: inline-block; margin-top: var(--space-2); padding: 0.6em 1.2em; border-radius: var(--r-sm); background: var(--surface); border: 1px solid var(--border); font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-secondary); }

/* ---------- 12. Footer ------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--border); padding-block: var(--space-5) var(--space-4); background: var(--ink-raised); }
.footer-inner { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: var(--space-4); }
.footer-brand p { margin-top: var(--space-2); max-width: 32ch; font-size: 0.9rem; }
.footer-heading { font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-tertiary); margin-bottom: var(--space-2); }
.footer-links a { display: block; padding-block: 0.4em; color: var(--text-secondary); font-size: 0.92rem; transition: color var(--t-fast) var(--ease); }
.footer-links a:hover, .footer-links a:focus-visible { color: var(--pulse); }
.footer-social { display: flex; gap: 0.6em; flex-wrap: wrap; }
.footer-social a { width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--surface); border: 1px solid var(--border); transition: all var(--t-fast) var(--ease); }
.footer-social a:hover { background: var(--gradient-signal); transform: translateY(-3px); }
.footer-social svg { width: 16px; height: 16px; }
.footer-bottom { margin-top: var(--space-5); padding-top: var(--space-3); border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-2); font-size: 0.85rem; color: var(--text-tertiary); }
.footer-bottom .mono { font-size: 0.8rem; }
.footer-legal-links { display: flex; gap: 1em; }
.footer-legal-links a:hover { color: var(--pulse); }

.back-to-top { position: fixed; right: var(--space-3); bottom: var(--space-3); width: 46px; height: 46px; border-radius: 50%; background: var(--gradient-signal); color: #fff; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(10px); transition: all var(--t-med) var(--ease); z-index: 90; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }
.back-to-top svg { width: 20px; height: 20px; }

/* ---------- 13. Animations & motion ---------------------------------------- */
@keyframes drift { 0% { transform: translate(0,0) rotate(0deg); } 100% { transform: translate(2%,3%) rotate(3deg); } }
@keyframes blink { 0%, 45% { opacity: 1; } 50%, 95% { opacity: 0; } 100% { opacity: 1; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.hero-stagger > * { animation: fadeUp var(--t-slow) var(--ease) both; }
.hero-stagger > *:nth-child(1) { animation-delay: 0.05s; }
.hero-stagger > *:nth-child(2) { animation-delay: 0.12s; }
.hero-stagger > *:nth-child(3) { animation-delay: 0.19s; }
.hero-stagger > *:nth-child(4) { animation-delay: 0.26s; }
.hero-stagger > *:nth-child(5) { animation-delay: 0.33s; }

/* ---------- 14. Responsive -------------------------------------------------- */
@media (max-width: 1024px) {
  .card-grid, .blog-listing-grid { grid-template-columns: repeat(2, 1fr); }
  .social-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .post-layout { grid-template-columns: 1fr; }
  .toc-wrap { position: static; margin-bottom: var(--space-3); }
  .toc-list { columns: 2; }
}
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 220px; }
  .avatar-img { width: 120px; height: 120px; }
  .contact-grid { grid-template-columns: 1fr; }
  .mv-grid, .skills-grid { grid-template-columns: 1fr; }
  .prev-next-grid { grid-template-columns: 1fr; }
  .prev-next-card.next { text-align: left; }
  .prev-next-card.next .direction { justify-content: flex-start; }
}
@media (max-width: 720px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav-panel { display: block; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--ink-raised); border-bottom: 1px solid var(--border); max-height: 0; overflow: hidden; transition: max-height var(--t-med) var(--ease); }
  .mobile-nav-panel.is-open { max-height: 400px; }
  .mobile-nav-panel ul { padding: var(--space-2) var(--space-3) var(--space-3); }
  .mobile-nav-panel a { display: block; padding: 0.9em 0.2em; font-weight: 600; border-bottom: 1px solid var(--border); }
  .mobile-nav-panel a[aria-current="page"] { color: var(--pulse); }
  .card-grid, .blog-listing-grid { grid-template-columns: 1fr; }
  .social-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-3); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  section { padding-block: var(--space-5); }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .search-wrap { max-width: none; }
  .toc-list { columns: 1; }
  .author-card .share-btn { margin-left: 0; width: 100%; justify-content: center; }
}
@media (max-width: 480px) {
  .container { padding-inline: var(--space-2); }
  h1 { letter-spacing: -0.03em; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-social { flex-wrap: wrap; }
  .share-options { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- Reduced motion & print ------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .hero::before { animation: none; }
  .hero-role .cursor { animation: none; opacity: 1; }
}
@media print {
  .site-header, .back-to-top, .mobile-nav-panel, .hero::before, .cta-band, form, .reading-progress-track, .toc-wrap, .share-btn { display: none; }
  body { background: #fff; color: #000; }
}