/* ============================================================
   THEME TOKENS
   [data-theme="dark"] is the default. [data-theme="light"]
   overrides the same variable names. The actual color scheme
   is always resolved to "light" or "dark" in data-theme; the
   user's chosen mode (light / dark / auto) lives separately in
   data-theme-mode, used only to drive the toggle icon.
   ============================================================ */
:root,
[data-theme="dark"] {
  --bg: #0b0f17;
  --panel: #121826;
  --panel-2: #182236;
  --border: #232e42;
  --text: #e9eef5;
  --muted: #8b96a8;
  --accent: #22b8a3;
  --accent-contrast: #04211d;
  --accent-soft: rgba(34, 184, 163, 0.12);
  --warn: #d1a350;
  --warn-soft: rgba(209, 163, 80, 0.12);
  --focus: #5b9dff;
  --shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg: #f7f9fc;
  --panel: #ffffff;
  --panel-2: #f1f4f9;
  --border: #e2e7f0;
  --text: #101828;
  --muted: #5b6472;
  --accent: #0f9488;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(15, 148, 136, 0.08);
  --warn: #9a6b1e;
  --warn-soft: rgba(154, 107, 30, 0.1);
  --focus: #2563eb;
  --shadow: 0 20px 40px -20px rgba(16, 24, 40, 0.15);
}

:root {
  --font-display: "Space Grotesk", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --font-body: "Inter", sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@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;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  transition: background 0.2s ease, color 0.2s ease;
}

a { color: inherit; }
img { max-width: 100%; display: block; }
::selection { background: var(--accent); color: var(--accent-contrast); }

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
  font-weight: 500;
}

.heading-lg { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; margin: 0; }
.heading-md { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.005em; margin: 0; }

/* ============================================================
   NAV
   ============================================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  gap: 16px;
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 26px;
  list-style: none;
  margin: 0; padding: 0;
  font-size: 13.5px;
}
.nav-links a {
  text-decoration: none;
  color: var(--muted);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

.nav-right { display: flex; align-items: center; gap: 10px; }

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 17px; height: 17px; }

/* Icon visibility follows the chosen mode (light / dark / auto),
   not the resolved color scheme, so "auto" always shows its own icon. */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-auto { display: none; }
[data-theme-mode="light"] .theme-toggle .icon-sun { display: block; }
[data-theme-mode="dark"] .theme-toggle .icon-moon { display: block; }
[data-theme-mode="auto"] .theme-toggle .icon-auto { display: block; }

.theme-mode-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  min-width: 34px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 84px 0 72px;
  border-bottom: 1px solid var(--border);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.12;
}
.hero h1 .accent { color: var(--accent); }
.hero .tagline {
  margin-top: 18px;
  color: var(--muted);
  font-size: 17px;
  max-width: 520px;
}
.cta-row {
  margin-top: 30px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-block;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, background 0.15s, opacity 0.15s;
}
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { transform: translateY(-1px); opacity: 0.92; }
.btn-ghost { border-color: var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* identity card */
.id-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}
.id-avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  margin-bottom: 16px;
}
.id-card .id-name { font-family: var(--font-display); font-weight: 600; font-size: 17px; }
.id-card .id-role { color: var(--muted); font-size: 13.5px; margin-top: 3px; }
.id-divider { height: 1px; background: var(--border); margin: 18px 0; }
.id-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  padding: 7px 0;
  color: var(--muted);
}
.id-row span:last-child { color: var(--text); text-align: right; }
.id-status {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
}
.id-status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }

/* ============================================================
   SECTION SHELL
   ============================================================ */
.section { padding: 68px 0; border-bottom: 1px solid var(--border); }
.section:last-of-type { border-bottom: none; }
.section-head { margin-bottom: 34px; }
.section-head .heading-md { font-size: 26px; }
.section-head .desc { color: var(--muted); margin-top: 8px; font-size: 15px; max-width: 480px; }

/* ============================================================
   ABOUT
   ============================================================ */
.about-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.about-col p { color: var(--muted); font-size: 15.5px; margin: 0 0 16px; }
.about-col p:last-child { margin-bottom: 0; }

/* ============================================================
   PATH (career timeline)
   ============================================================ */
.path-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  position: relative;
}
.path-track::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 4%;
  right: 4%;
  height: 1px;
  background: var(--border);
}
.path-step {
  position: relative;
  padding-top: 30px;
  padding-right: 16px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.path-step.in-view { opacity: 1; transform: translateY(0); }
.path-step::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.path-step .step-label { font-weight: 600; font-size: 14.5px; }
.path-step .step-detail { color: var(--muted); font-size: 13px; margin-top: 4px; line-height: 1.5; }

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}
.skill-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.skill-card .group-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.skill-item {
  font-size: 14px;
  padding: 6px 0;
  color: var(--text);
  border-top: 1px solid var(--border);
}
.skill-item:first-of-type { border-top: none; }

/* ============================================================
   PROJECTS
   ============================================================ */
.proj-list { display: flex; flex-direction: column; gap: 14px; }
.proj-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.15s;
}
.proj-card:hover { border-color: var(--accent); }
.proj-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}
.proj-top .heading-md { font-size: 17px; }
.status-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.status-tag[data-status="production"] { color: var(--accent); background: var(--accent-soft); }
.status-tag[data-status="lab"] { color: var(--warn); background: var(--warn-soft); }
.proj-card p { color: var(--muted); margin: 10px 0 14px; font-size: 14.5px; }
.stack-row { display: flex; flex-wrap: wrap; gap: 8px; }
.stack-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  background: var(--panel-2);
  padding: 4px 9px;
  border-radius: 4px;
}
.proj-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.proj-link:hover { text-decoration: underline; }

/* ============================================================
   CREDENTIALS
   ============================================================ */
.cred-list { border-top: 1px solid var(--border); }
.cred-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 6px;
}
.cred-row .title { font-weight: 600; font-size: 15px; }
.cred-row .org { color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.cred-row .year { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 44px;
  text-align: center;
}
.contact-panel .heading-md { font-size: 25px; margin-bottom: 12px; }
.contact-panel p { color: var(--muted); max-width: 440px; margin: 0 auto 26px; font-size: 15px; }
.contact-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.site-footer {
  padding: 30px 0 44px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .about-body { grid-template-columns: 1fr; }
  .path-track { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
  .path-track::before { display: none; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .theme-mode-label { display: none; }
  .hero { padding: 60px 0 48px; }
  .section { padding: 48px 0; }
  .contact-panel { padding: 30px 22px; }
}