/* ==========================================================================
   Portfolio styles
   Design system grounded in Apple Human Interface Guidelines principles:
   semantic color tokens, light/dark appearance, scalable type, generous
   spacing, and accessibility (contrast, focus, reduced motion).
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Typography scale (fluid, rem-based so it scales with user preferences) */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-3xl: 3rem;
  --text-4xl: 4rem;

  --leading-tight: 1.1;
  --leading-snug: 1.3;
  --leading-normal: 1.6;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 5rem;

  /* Radii & motion */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --dur: 0.35s;

  /* Layout */
  --content-max: 1080px;
  --content-pad: clamp(1.25rem, 5vw, 2.5rem);
  --header-h: 64px;
}

/* Light appearance (default) */
:root {
  color-scheme: light;

  /* Semantic background levels */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-tertiary: #fbfbfd;

  /* Foreground labels */
  --label-primary: #1d1d1f;
  --label-secondary: #424245;
  --label-tertiary: #6e6e73;
  --label-quaternary: #86868b;

  /* Accent */
  --accent: #0066cc;
  --accent-hover: #0077e6;
  --accent-contrast: #ffffff;

  --separator: rgba(0, 0, 0, 0.1);
  --separator-opaque: #d2d2d7;

  --shadow-color: rgba(0, 0, 0, 0.12);
  --link: #0066cc;
  --link-hover: #0051a8;

  --focus-ring: #0066cc;
}

/* Dark appearance — adapts automatically via prefers-color-scheme */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #161617;
    --label-primary: #f5f5f7;
    --label-secondary: #d1d1d6;
    --label-tertiary: #a1a1a6;
    --label-quaternary: #86868b;
    --accent: #2997ff;
    --accent-hover: #4da3ff;
    --accent-contrast: #000000;
    --separator: rgba(255, 255, 255, 0.18);
    --separator-opaque: #38383a;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --link: #2997ff;
    --link-hover: #4da3ff;
    --focus-ring: #2997ff;
  }
}

/* ---------- Base / reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  color: var(--label-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ==========================================================================
   Homepage ambient background
   A subtle, CSS-only animated aurora behind the content. Two soft radial
   gradients drift slowly; they are GPU-composited (transform/opacity only),
   sit behind all content, and pause under prefers-reduced-motion.
   ========================================================================== */
.home {
  position: relative;
}

.home::before,
.home::after {
  content: "";
  position: fixed;
  z-index: 0;
  pointer-events: none;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}

.home::before {
  top: -20vmax;
  left: -15vmax;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 45%, transparent), transparent 70%);
  animation: home-aurora-a 26s ease-in-out infinite alternate;
}

.home::after {
  bottom: -25vmax;
  right: -20vmax;
  background: radial-gradient(circle, color-mix(in srgb, #5856d6 40%, transparent), transparent 70%);
  animation: home-aurora-b 32s ease-in-out infinite alternate;
}

@keyframes home-aurora-a {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(6vmax, 4vmax) scale(1.15); }
}

@keyframes home-aurora-b {
  0%   { transform: translate(0, 0) scale(1.1); }
  100% { transform: translate(-5vmax, -3vmax) scale(1); }
}

/* Content layers above the background */
.home #main,
.home .site-header,
.home .site-footer {
  position: relative;
  z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
  .home::before,
  .home::after {
    animation: none;
  }
}

h1, h2, h3 {
  margin: 0;
  line-height: var(--leading-tight);
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
}

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

/* Accessible focus indicator (WCAG 2.4.7 / HIG accessibility) */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Screen-reader-only utility */
.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 */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100%;
  z-index: 200;
  padding: var(--space-3) var(--space-5);
  background: var(--bg-primary);
  color: var(--label-primary);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 16px var(--shadow-color);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ---------- Header / navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background-color: color-mix(in srgb, var(--bg-primary) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--separator);
}

.nav {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-pad);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--label-primary);
  font-weight: 600;
  font-size: var(--text-md);
}

.nav__brand:hover {
  color: var(--label-primary);
}

.nav__brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #5856d6);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--label-secondary);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav__link:hover {
  color: var(--label-primary);
  background-color: var(--bg-tertiary);
}

/* Current page / section indicator */
.nav__link.is-active,
.nav__link[aria-current="page"] {
  color: var(--label-primary);
  background-color: var(--bg-tertiary);
  font-weight: 600;
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
}

.nav__toggle-icon,
.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--label-primary);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav__toggle-icon {
  position: relative;
  margin: 0 auto;
}

.nav__toggle-icon::before {
  position: absolute;
  top: -6px;
  left: 0;
}

.nav__toggle-icon::after {
  position: absolute;
  top: 6px;
  left: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon {
  background: transparent;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::before {
  transform: translateY(6px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- Layout helpers ---------- */
.section {
  padding: var(--space-12) 0;
}

.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-pad);
}

.section__inner--narrow {
  max-width: 720px;
}

.section--tint {
  background-color: var(--bg-secondary);
}

.eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.section__intro {
  font-size: var(--text-lg);
  color: var(--label-secondary);
  max-width: 60ch;
  margin-bottom: var(--space-4);
}

.section__more {
  margin: 0 0 var(--space-8);
  font-size: var(--text-sm);
}

.section__more a {
  font-weight: 600;
  color: var(--link);
}

.section__more a:hover {
  color: var(--link-hover);
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-md);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.button--primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.button--primary:hover {
  background: var(--accent-hover);
  color: var(--accent-contrast);
  transform: translateY(-1px);
}

.button--secondary {
  background: var(--bg-tertiary);
  color: var(--label-primary);
  border: 1px solid var(--separator-opaque);
}

.button--secondary:hover {
  color: var(--label-primary);
  transform: translateY(-1px);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--space-12) * 2);
  padding-bottom: var(--space-12);
}

.hero__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-pad);
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}

.hero__role {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-5);
}

.hero__lede {
  font-size: var(--text-lg);
  color: var(--label-secondary);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: var(--space-8);
}

.about__text p + p {
  margin-top: var(--space-4);
}

.about__text p {
  font-size: var(--text-lg);
  color: var(--label-secondary);
  max-width: 60ch;
}

.about__facts {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.about__facts li {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.about__fact-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
}

/* ---------- Work / cards ---------- */
.work__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px var(--shadow-color);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px var(--shadow-color);
}

.card__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-tertiary);
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-6);
}

.card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.card__tag {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.card__venue {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--label-tertiary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-snug);
}

.card__text {
  font-size: var(--text-sm);
  color: var(--label-secondary);
  flex: 1;
  margin-bottom: var(--space-5);
}

.card__link {
  align-self: flex-start;
  font-weight: 600;
  color: var(--link);
}

.card__link:hover {
  color: var(--link-hover);
}

.card__links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: auto;
}

.card__links .card__link {
  margin-top: 0;
}

/* ---------- Contact ---------- */
.contact__email {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
  max-width: 480px;
}

.contact__label {
  flex: 0 0 auto;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
}

.contact__value {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--label-primary);
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}

.contact__email-at {
  color: var(--label-tertiary);
  font-weight: 500;
  font-size: 0.85em;
  padding: 0 var(--space-1);
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--separator);
  height: var(--header-h);
  display: flex;
  align-items: center;
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-pad);
  font-size: var(--text-sm);
  color: var(--label-tertiary);
}

/* ==========================================================================
   Sub-pages (work.html, experience.html)
   ========================================================================== */

/* Page banner: compact hero shared by sub-pages */
.page-hero {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--separator);
  padding: var(--space-10) 0;
}

.page-hero__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-pad);
}

.page-hero__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.page-hero__lede {
  font-size: var(--text-lg);
  color: var(--label-secondary);
  max-width: 58ch;
  margin: 0;
}

/* Publication / work list */
.pub {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-10) var(--content-pad);
}

.pub + .pub {
  padding-top: var(--space-8);
}

.pub__heading {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-5);
}

.pub__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.pub__item {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
}

.pub__thumb {
  flex: 0 0 auto;
  width: 92px;
  height: 92px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-tertiary);
  border: 1px solid var(--separator);
}

.pub__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Uniform placeholder for publications without an available cover */
.pub__thumb--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border: 1px solid var(--separator);
  color: var(--label-tertiary);
}

.pub__thumb-icon {
  width: 36px;
  height: 36px;
}

.pub__body {
  min-width: 0;
  flex: 1 1 auto;
}

.pub__title {
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.pub__authors,
.pub__venue {
  font-size: var(--text-sm);
  color: var(--label-secondary);
}

.pub__venue {
  margin-bottom: var(--space-2);
}

.pub__meta {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
}

.pub__link {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
}

@media (max-width: 480px) {
  .pub__item {
    flex-wrap: wrap;
    gap: var(--space-4);
  }

  .pub__thumb {
    width: 64px;
    height: 64px;
  }

  .pub__thumb-icon {
    width: 28px;
    height: 28px;
  }
}

/* Experience timeline */
.timeline {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-10) var(--content-pad);
}

.timeline + .timeline {
  padding-top: var(--space-8);
}

.timeline__heading {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.timeline__list {
  display: flex;
  flex-direction: column;
}

.timeline__item {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
  padding: 0 0 var(--space-6) var(--space-6);
  border-left: 1px solid var(--separator-opaque);
  margin-left: var(--space-2);
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-full);
  background: var(--accent);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__content {
  min-width: 0;
  flex: 1 1 auto;
}

/* Institution logo at the right of each timeline row */
.timeline__logo {
  flex: 0 0 auto;
  width: 72px;
  height: 48px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--separator);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-1);
  margin-top: var(--space-1);
}

.timeline__logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.timeline__period {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.timeline__role {
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.timeline__org {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--label-secondary);
  margin-bottom: var(--space-2);
}

.timeline__details {
  font-size: var(--text-sm);
  color: var(--label-secondary);
  margin: 0;
}

.timeline__details li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-1);
}

.timeline__details li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--label-tertiary);
}

/* Card-grid sections (Skills, Languages, Certificates) — not a timeline */
.cards {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-10) var(--content-pad);
}

.cards + .cards {
  padding-top: var(--space-8);
}

.cards__heading {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.cards__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

.card-chip {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
}

.card-chip__title {
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.card-chip__details {
  font-size: var(--text-sm);
  color: var(--label-secondary);
  margin: 0;
  line-height: var(--leading-snug);
}

/* Language cards: thumbnail + body */
.card-chip--lang {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.card-chip__thumb {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--separator);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  line-height: 1;
}

.card-chip__body {
  min-width: 0;
}

.card-chip--lang .card-chip__title {
  margin-bottom: var(--space-1);
}

/* Organization cards (Activities): wide logo thumbnail */
.card-chip--org {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.card-chip--org .card-chip__thumb {
  width: 72px;
  height: 48px;
  padding: var(--space-1);
}

.card-chip--org .card-chip__thumb--dark {
  background: #1c1c1e;
  border-color: rgba(255, 255, 255, 0.14);
}

.card-chip--org .card-chip__thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-chip--org .card-chip__title {
  margin-bottom: var(--space-1);
}

/* Skill proficiency indicator (segmented) */
.skill-level {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.skill-level__segs {
  display: flex;
  gap: var(--space-1);
}

.skill-level__seg {
  width: 18px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--separator-opaque);
}

.skill-level__seg.is-on {
  background: var(--accent);
}

.skill-level__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
}

/* Music / recent uploads */
.music {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-10) var(--content-pad);
}

.music__intro {
  font-size: var(--text-lg);
  color: var(--label-secondary);
  max-width: 60ch;
  margin-bottom: var(--space-8);
}

.music__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Compact home-page variant of the music list */
.music__home {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 680px;
}

.music__item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--dur) var(--ease);
}

.music__item:hover {
  background: var(--bg-tertiary);
}

.music__thumb {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.music__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.music__meta {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  min-width: 0;
}

.music__date {
  flex: 0 0 auto;
  width: 6.5rem;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
  font-variant-numeric: tabular-nums;
}

.music__name {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--label-primary);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.music__name:hover {
  color: var(--link);
}

.music__footer {
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--label-secondary);
}

.music__footer a {
  font-weight: 600;
}

/* Platform / account cards */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.platform {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.platform__name {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.platform__handle {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.platform__stats {
  display: flex;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.platform__desc {
  font-size: var(--text-sm);
  color: var(--label-secondary);
  margin: 0 0 var(--space-4);
}

.platform__link {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
}

.platform__stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.platform__stat-value {
  font-size: var(--text-xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.platform__stat-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-tertiary);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .work__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about__grid {
    grid-template-columns: 1fr;
  }

  .hero__title {
    font-size: var(--text-3xl);
  }

  .platform-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .timeline__item {
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .timeline__logo {
    width: 56px;
    height: 40px;
  }

  .timeline__content {
    width: 100%;
  }

  .music__item {
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
  }

  .music__meta {
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-3);
    min-width: 0;
  }

  .music__date {
    width: 100%;
  }

  .music__name {
    white-space: normal;
  }
}

@media (max-width: 680px) {
  :root {
    --text-4xl: 2.5rem;
    --text-3xl: 2rem;
  }

  .section {
    padding: var(--space-8) 0;
  }

  .hero {
    padding-top: var(--space-10);
  }

  .work__grid {
    grid-template-columns: 1fr;
  }

  /* Mobile nav */
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) var(--content-pad) var(--space-4);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--separator);
    box-shadow: 0 12px 30px var(--shadow-color);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
      visibility var(--dur);
  }

  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav__menu li a {
    display: block;
    padding: var(--space-4) var(--space-2);
    font-size: var(--text-lg);
    border-bottom: 1px solid var(--separator);
    border-radius: 0;
  }

  .nav__menu li a.is-active,
  .nav__menu li a[aria-current="page"] {
    background-color: transparent;
    color: var(--link);
    font-weight: 600;
  }
}

/* ---------- Reduced motion (HIG: respect accessibility setting) ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}