/* ==========================================================================
   Rohit Swami — portfolio
   Design tokens → base → layout → components → sections → responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */

:root {
  /* Light palette (default, defined on bare :root) */
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f6f7f9;
  --surface-hover: #f0f2f5;
  --border: #e4e7ec;
  --border-strong: #d0d5dd;

  --fg: #0f1218;
  --fg-muted: #525b6b;
  --fg-subtle: #7a8394;

  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-fg: #ffffff;
  --accent-2: #0891b2;

  --grad: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --grad-text: linear-gradient(120deg, #4f46e5 0%, #0891b2 100%);

  --ring: color-mix(in srgb, var(--accent) 40%, transparent);
  --glow: radial-gradient(60% 60% at 50% 0%, color-mix(in srgb, var(--accent) 14%, transparent) 0%, transparent 100%);

  --shadow-sm: 0 1px 2px rgb(16 24 40 / 0.05);
  --shadow-md: 0 4px 12px -2px rgb(16 24 40 / 0.08), 0 2px 4px -2px rgb(16 24 40 / 0.04);
  --shadow-lg: 0 16px 32px -8px rgb(16 24 40 / 0.12), 0 4px 8px -4px rgb(16 24 40 / 0.06);

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Scale */
  --step--1: clamp(0.8rem, 0.77rem + 0.15vw, 0.875rem);
  --step-0: clamp(0.95rem, 0.92rem + 0.16vw, 1.0625rem);
  --step-1: clamp(1.15rem, 1.08rem + 0.35vw, 1.375rem);
  --step-2: clamp(1.45rem, 1.32rem + 0.65vw, 1.9rem);
  --step-3: clamp(1.85rem, 1.6rem + 1.25vw, 2.75rem);
  --step-4: clamp(2.4rem, 1.9rem + 2.5vw, 4.25rem);

  /* Space & shape */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4rem, 9vw, 7.5rem);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-full: 999px;
  --maxw: 1120px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.45s;

  color-scheme: light;
}

/* Dark — system preference, unless the user forced light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0c11;
    --bg-alt: #0f1218;
    --surface: #12161f;
    --surface-2: #171c26;
    --surface-hover: #1c222e;
    --border: #232a37;
    --border-strong: #333c4d;

    --fg: #e8ecf4;
    --fg-muted: #9aa4b6;
    --fg-subtle: #6f7a8d;

    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --accent-soft: #1a1f36;
    --accent-fg: #0a0c11;
    --accent-2: #22d3ee;

    --grad: linear-gradient(135deg, #818cf8 0%, #22d3ee 100%);
    --grad-text: linear-gradient(120deg, #a5b4fc 0%, #67e8f9 100%);

    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
    --shadow-md: 0 4px 12px -2px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 16px 40px -8px rgb(0 0 0 / 0.6), 0 4px 8px -4px rgb(0 0 0 / 0.4);

    color-scheme: dark;
  }
}

/* Dark — explicit toggle wins in both directions */
:root[data-theme="dark"] {
  --bg: #0a0c11;
  --bg-alt: #0f1218;
  --surface: #12161f;
  --surface-2: #171c26;
  --surface-hover: #1c222e;
  --border: #232a37;
  --border-strong: #333c4d;

  --fg: #e8ecf4;
  --fg-muted: #9aa4b6;
  --fg-subtle: #6f7a8d;

  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --accent-soft: #1a1f36;
  --accent-fg: #0a0c11;
  --accent-2: #22d3ee;

  --grad: linear-gradient(135deg, #818cf8 0%, #22d3ee 100%);
  --grad-text: linear-gradient(120deg, #a5b4fc 0%, #67e8f9 100%);

  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 12px -2px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 16px 40px -8px rgb(0 0 0 / 0.6), 0 4px 8px -4px rgb(0 0 0 / 0.4);

  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   2. Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.022em;
  font-weight: 700;
  text-wrap: balance;
}

p { margin: 0 0 1em; text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
a:hover { color: var(--accent-hover); }

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

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

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background: color-mix(in srgb, var(--accent) 25%, transparent);
  color: var(--fg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 0 0 var(--radius) 0;
  font-weight: 600;
}
.skip-link:focus {
  left: 0;
  color: var(--accent-fg);
}

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

/* --------------------------------------------------------------------------
   3. Layout primitives
   -------------------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
  position: relative;
}
.section--alt { background: var(--bg-alt); }

.section-head {
  margin-bottom: clamp(2rem, 4vw, 3.25rem);
  max-width: 46rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.85rem;
}
.eyebrow::before {
  content: "";
  width: 1.75rem;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}

.section-title { font-size: var(--step-3); }

.section-sub {
  margin-top: 0.85rem;
  color: var(--fg-muted);
  font-size: var(--step-1);
  line-height: 1.55;
  font-weight: 400;
}

/* --------------------------------------------------------------------------
   4. Buttons, chips, tags
   -------------------------------------------------------------------------- */

.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--fg);
  --btn-bd: var(--border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.7rem 1.3rem;
  border: 1px solid var(--btn-bd);
  border-radius: var(--radius-full);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--btn-fg);
}
.btn:active { transform: translateY(0); }

.btn--primary {
  --btn-bg: var(--accent);
  --btn-fg: var(--accent-fg);
  --btn-bd: transparent;
}
.btn--primary:hover { --btn-bg: var(--accent-hover); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-bd: var(--border-strong);
}
.btn--ghost:hover { background: var(--surface-hover); }

.btn svg { width: 1.05em; height: 1.05em; flex: none; }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface-2);
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.5;
  white-space: nowrap;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

/* --------------------------------------------------------------------------
   5. Header / nav
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.site-header.is-stuck {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--fg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-right: auto;
}
.brand:hover { color: var(--fg); }

.brand__mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 9px;
  background: var(--grad);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav__link {
  position: relative;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  font-size: var(--step--1);
  font-weight: 500;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.nav__link:hover { color: var(--fg); background: var(--surface-hover); }
.nav__link.is-active { color: var(--fg); font-weight: 600; }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0.8rem;
  right: 0.8rem;
  bottom: 0.1rem;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
}

.nav__tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--fg-muted);
  cursor: pointer;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}
.icon-btn:hover {
  color: var(--fg);
  background: var(--surface-hover);
  border-color: var(--border-strong);
}
.icon-btn svg { width: 1.1rem; height: 1.1rem; }

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.nav__toggle { display: none; }

/* Mobile drawer */
@media (max-width: 860px) {
  .nav__toggle { display: grid; }
  .nav__resume { display: none; }

  .nav__links {
    position: fixed;
    inset: 4.25rem 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    padding: 1rem var(--gutter) 1.5rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s;
  }
  .nav__links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav__link { padding: 0.75rem 0.85rem; font-size: 1rem; }
  .nav__link.is-active::after { display: none; }
}

/* --------------------------------------------------------------------------
   6. Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem) clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 130%;
  background: var(--glow);
  pointer-events: none;
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(70% 55% at 50% 30%, #000 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(70% 55% at 50% 30%, #000 0%, transparent 100%);
  opacity: 0.45;
  pointer-events: none;
  z-index: -1;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.35rem 0.9rem 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--fg-muted);
}

.badge__dot {
  position: relative;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #22c55e;
  flex: none;
}
.badge__dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: inherit;
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0% { transform: scale(1); opacity: 0.7; }
  70%, 100% { transform: scale(2.6); opacity: 0; }
}

.hero__title {
  margin-top: 1.4rem;
  font-size: var(--step-4);
  letter-spacing: -0.035em;
}

.hero__role {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: -0.025em;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  margin-top: 1.4rem;
  max-width: 34rem;
  font-size: var(--step-1);
  color: var(--fg-muted);
  line-height: 1.6;
}
.hero__lede strong { color: var(--fg); font-weight: 600; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.socials {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.75rem;
}
.socials .icon-btn { border-radius: var(--radius-full); }

/* Portrait */
.hero__aside {
  position: relative;
  justify-self: center;
  width: min(100%, 22rem);
}

.portrait {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-2);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 1 / 1;
}
.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}
.portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad);
  opacity: 0.1;
  mix-blend-mode: overlay;
}

.portrait-frame::before {
  content: "";
  position: absolute;
  inset: -1.25rem;
  border-radius: calc(var(--radius-lg) + 1rem);
  background: var(--grad);
  opacity: 0.16;
  filter: blur(2.5rem);
  z-index: -1;
}
.portrait-frame { position: relative; }

.hero__card {
  position: absolute;
  right: -0.5rem;
  bottom: -1.25rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}
.hero__card img {
  width: 2rem;
  height: 2rem;
  border-radius: 7px;
  object-fit: contain;
  background: #fff;
  padding: 2px;
}
.hero__card-label {
  font-size: 0.7rem;
  color: var(--fg-subtle);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
}
.hero__card-value { font-size: var(--step--1); font-weight: 600; line-height: 1.3; }

/* Stats strip */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(3rem, 6vw, 5rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--border);
  overflow: hidden;
}

.stat {
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  background: var(--surface);
  transition: background-color 0.25s var(--ease);
}
.stat:hover { background: var(--surface-hover); }

.stat__value {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__label {
  margin-top: 0.3rem;
  font-size: var(--step--1);
  color: var(--fg-muted);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   7. Cards
   -------------------------------------------------------------------------- */

.card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    border-color 0.28s var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   8. About
   -------------------------------------------------------------------------- */

.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.prose p { color: var(--fg-muted); font-size: var(--step-0); }
.prose strong { color: var(--fg); font-weight: 600; }

.info-card {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.info-list { display: grid; gap: 0.9rem; }
.info-list > div {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  font-size: var(--step--1);
}
.info-list dt {
  color: var(--fg-subtle);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.7rem;
  font-weight: 600;
}
.info-list dd { margin: 0; color: var(--fg); font-weight: 500; overflow-wrap: anywhere; }

.skills { margin-top: clamp(2.5rem, 5vw, 3.5rem); display: grid; gap: 1.5rem; }

.skill-group__title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.85rem;
}
.skill-group__title svg { width: 1rem; height: 1rem; color: var(--accent); }

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   9. Experience timeline
   -------------------------------------------------------------------------- */

.timeline {
  position: relative;
  display: grid;
  gap: 1.25rem;
}

.xp {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.35rem, 3vw, 2rem);
}

.xp__when {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: flex-start;
}

.xp__period {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--fg-muted);
  line-height: 1.4;
}
.xp__period b { display: block; color: var(--fg); font-weight: 600; }

.xp__logo {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  padding: 5px;
  object-fit: contain;
}

.xp__role {
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.xp__org {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.3rem;
  font-size: var(--step--1);
  color: var(--fg-muted);
}
.xp__org a { font-weight: 600; }
.xp__sep { color: var(--border-strong); }

.xp__points {
  margin-top: 1.1rem;
  display: grid;
  gap: 0.7rem;
}
.xp__points li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--fg-muted);
  font-size: var(--step--1);
  line-height: 1.65;
}
.xp__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grad);
}
.xp__points strong { color: var(--fg); font-weight: 600; }

.xp__tags { margin-top: 1.1rem; }

.xp--current { border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.xp--current::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  bottom: 1.35rem;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--grad);
}

/* --------------------------------------------------------------------------
   10. Projects
   -------------------------------------------------------------------------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter {
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface);
  color: var(--fg-muted);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}
.filter:hover { color: var(--fg); border-color: var(--border-strong); }
.filter[aria-pressed="true"] {
  background: var(--accent);
  border-color: transparent;
  color: var(--accent-fg);
  font-weight: 600;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: 1.25rem;
}

.project {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  appearance: none;
}
.project[hidden] { display: none; }

.project__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.project__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}
.project:hover .project__media img { transform: scale(1.045); }

.project__cat {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.6rem;
  padding: 1.15rem 1.25rem 1.35rem;
}

.project__title {
  font-size: var(--step-1);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.project__desc {
  color: var(--fg-muted);
  font-size: var(--step--1);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  line-clamp: 3;
  overflow: hidden;
}

.project__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding-top: 0.9rem;
}

.project__date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-subtle);
}

.project__more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--accent);
}
.project__more svg { width: 0.9em; height: 0.9em; transition: transform 0.25s var(--ease); }
.project:hover .project__more svg { transform: translateX(3px); }

.project__detail { display: none; }

/* Archive */
.archive {
  margin-top: 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  overflow: hidden;
}

.archive > summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.1rem 1.35rem;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--step-0);
  list-style: none;
  user-select: none;
  transition: background-color 0.2s var(--ease);
}
.archive > summary::-webkit-details-marker { display: none; }
.archive > summary:hover { background: var(--surface-hover); }

.archive__chevron {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--fg-subtle);
  transition: transform 0.28s var(--ease);
  flex: none;
}
.archive[open] .archive__chevron { transform: rotate(180deg); }

.archive__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--fg-subtle);
}

.archive__body {
  padding: 0.35rem 0.75rem 0.9rem;
  border-top: 1px solid var(--border);
}

.arch-item {
  display: grid;
  grid-template-columns: 4.25rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  width: 100%;
  padding: 0.85rem 0.7rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.2s var(--ease);
}
.arch-item + .arch-item { box-shadow: inset 0 1px 0 var(--border); }
.arch-item:hover { background: var(--surface-hover); }
.arch-item[hidden] { display: none; }

.arch-item__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-subtle);
}
.arch-item__name { font-weight: 600; font-size: var(--step--1); }
.arch-item__meta { font-size: 0.75rem; color: var(--fg-muted); margin-top: 0.15rem; }
.arch-item__icon { width: 1rem; height: 1rem; color: var(--fg-subtle); flex: none; }

.empty-state {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--fg-subtle);
  font-size: var(--step--1);
}

/* --------------------------------------------------------------------------
   11. Modal
   -------------------------------------------------------------------------- */

.modal {
  width: min(46rem, calc(100vw - 2rem));
  max-height: min(85vh, 50rem);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--fg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.modal::backdrop {
  background: rgb(6 8 12 / 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal[open] { animation: modal-in 0.3s var(--ease); }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

.modal__close {
  position: absolute;
  right: 0.85rem;
  top: 0.85rem;
  z-index: 2;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal__scroll {
  max-height: min(85vh, 50rem);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.modal__hero {
  aspect-ratio: 16 / 7;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.modal__hero img { width: 100%; height: 100%; object-fit: cover; }

.modal__body { padding: clamp(1.4rem, 3vw, 2rem); }

.modal__title {
  font-size: var(--step-2);
  letter-spacing: -0.03em;
}

.modal__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  gap: 0.9rem 1.5rem;
  margin: 1.4rem 0;
  padding: 1.1rem 0;
  border-block: 1px solid var(--border);
}
.modal__meta dt {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-subtle);
  margin-bottom: 0.2rem;
}
.modal__meta dd { margin: 0; font-size: var(--step--1); overflow-wrap: anywhere; }

.modal__points { display: grid; gap: 0.7rem; margin-top: 1rem; }
.modal__points li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--fg-muted);
  font-size: var(--step--1);
  line-height: 1.65;
}
.modal__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grad);
}
.modal__points strong, .modal p strong { color: var(--fg); font-weight: 600; }

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.75rem;
}

/* --------------------------------------------------------------------------
   12. Publications / education / certifications
   -------------------------------------------------------------------------- */

.pub-list { display: grid; gap: 1rem; }

.pub {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1.15rem;
  padding: 1.35rem 1.5rem;
}

.pub__num {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.15rem;
}

.pub__title {
  font-size: var(--step-1);
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--fg);
}
a.pub__title:hover { color: var(--accent); }

.pub__where { margin-top: 0.4rem; color: var(--fg-muted); font-size: var(--step--1); }

.pub__ids {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
  align-items: center;
}

.pub__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: var(--step--1);
  font-weight: 600;
}
.pub__link svg { width: 0.85em; height: 0.85em; }

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.edu-list { display: grid; gap: 1rem; }

.edu {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1.1rem;
  align-items: center;
  padding: 1.15rem 1.35rem;
}
.edu__logo {
  width: 3rem;
  height: 3rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  padding: 5px;
  object-fit: contain;
}
.edu__title { font-size: var(--step-0); font-weight: 650; letter-spacing: -0.015em; }
.edu__meta {
  margin-top: 0.2rem;
  font-size: var(--step--1);
  color: var(--fg-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.edu__period {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-subtle);
}

.award { position: relative; }
.award__badge {
  position: absolute;
  right: 1rem;
  top: 1rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--grad);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   13. Contact + footer
   -------------------------------------------------------------------------- */

.contact-panel {
  position: relative;
  padding: clamp(2rem, 5vw, 3.5rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.contact-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
}

.contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.contact-links { display: grid; gap: 0.75rem; margin-top: 1.75rem; }

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--fg);
  font-weight: 500;
  font-size: var(--step--1);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease),
    background-color 0.22s var(--ease);
}
.contact-link:hover {
  transform: translateX(4px);
  border-color: var(--border-strong);
  background: var(--surface-hover);
  color: var(--fg);
}
.contact-link svg:first-child { width: 1.15rem; height: 1.15rem; color: var(--accent); flex: none; }
.contact-link__arrow { width: 0.95rem; height: 0.95rem; margin-left: auto; color: var(--fg-subtle); flex: none; }

.qr-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  text-align: center;
  justify-self: center;
  max-width: 15rem;
}
.qr-card img {
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 0.5rem;
  width: 100%;
}
.qr-card p { margin: 0.85rem 0 0; font-size: var(--step--1); color: var(--fg-muted); }

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2.25rem;
  background: var(--bg-alt);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: var(--step--1);
  color: var(--fg-muted);
}
.footer__socials { display: flex; gap: 0.4rem; }
.footer__heart { color: #ef4444; }

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 90;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-full);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0.28s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

/* --------------------------------------------------------------------------
   14. Motion
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   15. Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__aside { order: -1; width: min(100%, 17rem); justify-self: start; }
  .hero__card { right: auto; left: 60%; }
  .about__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
  .qr-card { justify-self: start; }
}

@media (max-width: 760px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp { grid-template-columns: 1fr; }
  .xp__when { flex-direction: row; align-items: center; gap: 0.85rem; }
  .xp__logo { order: -1; }
  .pub { grid-template-columns: 1fr; gap: 0.5rem; }
  .pub__num { padding-top: 0; }
  .arch-item { grid-template-columns: minmax(0, 1fr) auto; }
  .arch-item__year { display: none; }
  .modal__hero { aspect-ratio: 16 / 9; }
}

@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr; }
  .hero__card { position: static; margin-top: 1rem; }
}