/* ============================================================
   Bagus Arya Dwipangga — Portfolio
   Data-editorial · zinc neutrals + emerald accent
   Theming: [data-theme] tokens · motion: transform/opacity only
   ============================================================ */

:root {
  --font-sans: 'Space Grotesk', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --nav-h: 68px;
  --radius-card: 14px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme='light'] {
  color-scheme: light;
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #18181b;
  --muted: #55555e;
  --faint: #6f6f78;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --accent: #047857;
  --accent-contrast: #ecfdf5;
  --accent-soft: rgba(4, 120, 87, 0.09);
  --btn-bg: #18181b;
  --btn-text: #fafafa;
  --grid-line: rgba(24, 24, 27, 0.05);
  --shadow: 0 1px 2px rgba(24, 24, 27, 0.04), 0 12px 32px -16px rgba(24, 24, 27, 0.14);
  --scrim: rgba(250, 250, 250, 0.84);
}

[data-theme='dark'] {
  color-scheme: dark;
  --bg: #0c0c0e;
  --surface: #141417;
  --text: #f4f4f5;
  --muted: #a1a1aa;
  --faint: #909098;
  --border: #27272b;
  --border-strong: #3a3a40;
  --accent: #34d399;
  --accent-contrast: #06281d;
  --accent-soft: rgba(52, 211, 153, 0.1);
  --btn-bg: #f4f4f5;
  --btn-text: #131316;
  --grid-line: rgba(255, 255, 255, 0.05);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -16px rgba(0, 0, 0, 0.55);
  --scrim: rgba(12, 12, 14, 0.82);
}

/* ---------- Base ---------- */

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

html {
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

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

svg {
  display: inline-block;
  vertical-align: middle;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

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

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

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

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
}

.container {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 44px);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-200%);
}

.skip-link:focus-visible {
  transform: none;
}

.accent-text {
  color: var(--accent);
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: var(--bg);
  background: var(--scrim);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 100%;
}

.wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.wm-dot {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-inline: auto;
}

.nav-links a {
  position: relative;
  padding: 8px 14px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a.active {
  color: var(--text);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  transition: color 0.15s ease, border-color 0.15s ease, transform 0.15s var(--ease-out);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.theme-toggle:active {
  transform: scale(0.94);
}

[data-theme='light'] .icon-sun { display: none; }
[data-theme='dark'] .icon-moon { display: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: transform 0.15s var(--ease-out), background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn svg {
  width: 17px;
  height: 17px;
  transition: transform 0.2s var(--ease-out);
}

.btn-primary:hover svg {
  transform: translateY(2px);
}

.btn-primary {
  background: var(--btn-bg);
  color: var(--btn-text);
}

.btn-secondary {
  border: 1px solid var(--border-strong);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-small {
  min-height: 40px;
  padding: 8px 18px;
  font-size: 14px;
}

.btn-small:hover {
  transform: translateY(-1px);
}

/* ---------- Sections ---------- */

.section {
  padding-block: clamp(64px, 9vw, 112px);
  border-top: 1px solid var(--border);
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: clamp(36px, 5vw, 56px);
}

.sec-num {
  font-size: 13px;
  color: var(--accent);
}

.sec-head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  letter-spacing: -0.025em;
}

.sec-note {
  margin-left: auto;
  font-size: 14px;
  color: var(--faint);
  text-align: right;
}

/* ---------- Hero ---------- */

.hero {
  padding-top: clamp(48px, 8vh, 88px);
  padding-bottom: clamp(64px, 9vw, 112px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(320px, 5fr);
  gap: clamp(40px, 6vw, 72px);
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--muted);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  margin-top: 22px;
  font-size: clamp(2.7rem, 6.4vw, 4.4rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.02;
  text-wrap: balance;
}

.hero-sub {
  margin-top: 20px;
  max-width: 54ch;
  font-size: 17px;
  color: var(--muted);
}

.hero-tagline {
  color: var(--text);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* Hero figure */

.hero-fig {
  margin: 0;
  padding: 22px 22px 18px;
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    var(--surface);
  background-size: 25px 25px, 25px 25px, auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
}

.fig-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.fig-photo {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  overflow: hidden;
}

.fig-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.fig-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--border-strong);
}

.fig-stats dt {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.fig-stats dd {
  margin: 4px 0 0;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
  font-feature-settings: 'tnum';
}

.stat-text { font-family: var(--font-sans); }

/* ---------- Projects ---------- */

.projects li + li {
  border-top: 1px solid var(--border);
}

.project {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 172px;
  gap: 16px 28px;
  padding: clamp(28px, 4vw, 40px) 0;
}

.p-num {
  font-size: 13px;
  color: var(--faint);
  padding-top: 5px;
  font-feature-settings: 'tnum';
}

.p-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.project h3 {
  font-size: clamp(1.25rem, 2.2vw, 1.55rem);
  letter-spacing: -0.02em;
}

.project h3 a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: color 0.15s ease;
}

.project h3 a .ext {
  width: 0.62em;
  height: 0.62em;
  color: var(--accent);
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity 0.2s ease, transform 0.25s var(--ease-out);
}

.project h3 a:hover,
.project h3 a:focus-visible {
  color: var(--accent);
}

.project h3 a:hover .ext,
.project h3 a:focus-visible .ext {
  opacity: 1;
  transform: translate(0, 0);
}

.p-tag {
  font-size: 13.5px;
  color: var(--faint);
}

.p-desc {
  margin-top: 10px;
  max-width: 62ch;
  font-size: 15.5px;
  color: var(--muted);
}

.p-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: 16px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags li {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.p-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
  padding-top: 5px;
}

.p-links {
  display: flex;
  gap: 8px;
}

.link-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 15px;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s var(--ease-out);
}

.link-chip svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s var(--ease-out);
}

.link-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.link-chip:hover svg {
  transform: translate(2px, -2px);
}

.link-chip:active {
  transform: scale(0.97);
}

/* ---------- Experience ---------- */

.timeline {
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 175px;
  width: 1px;
  background: var(--border);
}

.t-item {
  position: relative;
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 54px;
  padding: 30px 0;
}

.t-item::before {
  content: '';
  position: absolute;
  top: 41px;
  left: 172px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

.t-date {
  padding-top: 3px;
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
  font-feature-settings: 'tnum';
}

.t-body h3 {
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

.t-org {
  margin-top: 4px;
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}

.t-list {
  margin-top: 12px;
  display: grid;
  gap: 6px;
  max-width: 68ch;
}

.t-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--muted);
}

.t-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.72em;
  width: 6px;
  height: 1.5px;
  background: var(--border-strong);
}

/* ---------- Publications ---------- */

.pubs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.pub-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(22px, 3vw, 30px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.pub-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

.pub-type {
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 10.5px;
  letter-spacing: 0.1em;
}

.pub-card h3 {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 12px;
  color: var(--faint);
  font-feature-settings: 'tnum';
}

.pub-card .link-chip {
  margin-top: auto;
  background: transparent;
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(40px, 6vw, 72px);
  align-items: start;
}

.about-main > p:not(.about-lede) {
  margin-top: 18px;
  color: var(--muted);
  font-size: 16px;
  max-width: 58ch;
}

.about-lede {
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.02em;
  max-width: 24ch;
}

.edu-card {
  margin-top: 34px;
  padding: 26px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.edu-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--faint);
}

.edu-card h3 {
  margin-top: 12px;
  font-size: 1.3rem;
}

.edu-inst {
  margin-top: 5px;
  font-size: 14.5px;
  color: var(--muted);
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-strong);
  font-size: 13px;
  color: var(--muted);
  font-feature-settings: 'tnum';
}

.about-side {
  display: grid;
  gap: 30px;
}

.skill-group h4 {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--faint);
}

.skill-group .tags {
  margin-top: 14px;
}

.tags-soft li {
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
}

.award-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding: 15px 18px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}

.award-pill svg {
  width: 19px;
  height: 19px;
}

/* ---------- Contact ---------- */

.contact-inner {
  max-width: 860px;
  text-align: center;
}

.contact-head h2 {
  font-size: clamp(2.1rem, 4.5vw, 3.1rem);
  letter-spacing: -0.03em;
}

.contact-head p {
  margin: 18px auto 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 16.5px;
}

.contact-mail {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 38px;
  font-size: clamp(1.25rem, 3.4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.contact-mail svg {
  width: 0.7em;
  height: 0.7em;
  color: var(--accent);
  transition: transform 0.25s var(--ease-out);
}

.contact-mail:hover svg {
  transform: translate(4px, -4px);
}

.contact-mail {
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 2px;
  transition: background-size 0.35s var(--ease-out);
}

.contact-mail:hover {
  background-size: 100% 2px;
}

.contact-channels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: clamp(44px, 6vw, 64px);
  text-align: left;
}

.contact-channels a,
.contact-channels li > div {
  display: block;
  height: 100%;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface);
  font-size: 15px;
  font-weight: 600;
  transition: border-color 0.2s ease, transform 0.2s var(--ease-out);
}

.contact-channels svg {
  display: block;
  width: 20px;
  height: 20px;
  margin-bottom: 14px;
  color: var(--accent);
}

.ch-val {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--muted);
}

.contact-channels a:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 26px;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- Reveal on scroll ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
  transition-delay: var(--d, 0ms);
  will-change: opacity, transform;
}

.js [data-reveal].revealed {
  opacity: 1;
  transform: none;
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

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

/* ---------- Responsive ---------- */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
    gap: 44px;
  }
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-fig {
    max-width: 560px;
  }

  .project {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .p-num {
    grid-column: 1;
  }

  .p-side {
    grid-column: 2;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .timeline::before {
    left: 3px;
  }

  .t-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-left: 28px;
  }

  .t-item::before {
    top: 8px;
    left: 0;
  }

  .t-date {
    padding-top: 0;
    font-size: 12.5px;
    color: var(--faint);
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-lede {
    max-width: 30ch;
  }

  .contact-channels {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .sec-note {
    display: none;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 11vw, 2.9rem);
  }

  .hero-cta .btn {
    flex: 1 1 auto;
    justify-content: center;
  }

  .fig-stats {
    grid-template-columns: 1fr 1fr;
  }

  .project {
    display: block;
  }

  .p-num {
    display: inline-block;
    padding-top: 0;
    margin-right: 10px;
  }

  .p-title-row {
    display: block;
  }

  .p-title-row .p-tag {
    display: block;
    margin-top: 3px;
  }

  .p-side {
    margin-top: 18px;
  }

  .p-links {
    flex-wrap: wrap;
  }

  .contact-channels {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    justify-content: center;
    text-align: center;
  }
}