/* ========== Design System: Reset & Tokens ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

:root {
  color-scheme: light dark;

  /* Brand */
  --accent: #0ea5e9;     /* sky-500 */
  --accent-600: #0284c7; /* sky-600 */
  --accent-300: #38bdf8; /* sky-400/300 for gradients */

  /* Neutrals */
  --bg: #ffffff;
  --surface: #f8fafc;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;

  /* Elevation & shape */
  --shadow: 0 1px 2px rgba(2, 6, 23, 0.06), 0 10px 20px rgba(2, 6, 23, 0.05);
  --radius: 14px;
  --radius-sm: 10px;

  /* Layout */
  --container: 1100px;
  --header-h: 64px;

  /* Fancy */
  --glass-bg: color-mix(in srgb, var(--surface) 78%, transparent);
  --glass-brd: color-mix(in srgb, var(--border) 80%, transparent);
  --ring-shadow: 0 0 0 1px color-mix(in srgb, var(--border) 85%, transparent) inset;
  --accent-glow: 0 10px 30px color-mix(in srgb, var(--accent) 25%, transparent);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #0f172a;
    --text: #e5e7eb;
    --text-muted: #94a3b8;
    --border: #1f2937;

    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 20px rgba(0, 0, 0, 0.3);
    --glass-bg: color-mix(in srgb, var(--surface) 70%, transparent);
    --glass-brd: color-mix(in srgb, var(--border) 70%, transparent);
    --accent-glow: 0 20px 50px color-mix(in srgb, var(--accent) 30%, transparent);
  }
}

/* Manual override via [data-theme="dark"] */
[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #0f172a;
  --text: #e5e7eb;
  --text-muted: #94a3b8;
  --border: #1f2937;

  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 20px rgba(0, 0, 0, 0.3);
  --glass-bg: color-mix(in srgb, var(--surface) 70%, transparent);
  --glass-brd: color-mix(in srgb, var(--border) 70%, transparent);
  --accent-glow: 0 20px 50px color-mix(in srgb, var(--accent) 30%, transparent);
}

body {
  margin: 0;
  background:
    radial-gradient(900px 900px at 10% -20%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%),
    radial-gradient(800px 800px at 110% 0%, color-mix(in srgb, #a78bfa 10%, transparent), transparent 55%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 96%, transparent) 0%, var(--bg) 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle noise overlay for depth (very light) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, #ffffff06 0 2px, transparent 2px 4px);
  mix-blend-mode: overlay;
  opacity: 0.02;
}

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

::selection {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
  color: #fff;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 10px;
}

/* ========== Layout Utilities ========== */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 16px;
}

.section {
  padding: 84px 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.section.alt {
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  backdrop-filter: blur(6px) saturate(120%);
  -webkit-backdrop-filter: blur(6px) saturate(120%);
}

h1,
h2,
h3,
h4 {
  color: var(--text);
}

h1 {
  font-weight: 800;
}

h2 {
  font-size: clamp(24px, 3vw, 34px);
  margin: 0 0 18px 0;
  letter-spacing: 0.2px;
  position: relative;
}
h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 30%, transparent));
  border-radius: 999px;
  margin-top: 10px;
  box-shadow: 0 4px 18px color-mix(in srgb, var(--accent) 30%, transparent);
}

/* ========== Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(130%) blur(10px);
  -webkit-backdrop-filter: saturate(130%) blur(10px);
  box-shadow: 0 6px 30px rgba(2, 6, 23, 0.08);
}
@supports not (color-mix(in srgb, white 88%, transparent)) {
  .site-header {
    background: var(--bg);
  }
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-weight: 900;
  letter-spacing: 0.2px;
  color: var(--text);
}
.nav {
  display: flex;
  gap: 18px;
  align-items: center;
}
.nav a {
  color: var(--text-muted);
  padding: 8px 10px;
  border-radius: 10px;
  position: relative;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.nav a:hover {
  color: var(--text);
  text-decoration: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-brd);
  box-shadow: var(--shadow);
}
.nav a.active {
  color: var(--text);
  text-decoration: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-brd);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent);
}

/* Mobile menu toggle (burger) */
.menu-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  display: none; /* visible on mobile via media query */
  transition: background .2s ease;
}
.menu-toggle:hover {
  background: var(--bg);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
  width: auto;
  height: auto;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  z-index: 1001;
}

/* ========== Hero ========== */
.hero {
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(600px 300px at 35% 25%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%);
  opacity: .35;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.08;
  margin: 0 0 16px 0;
}
.accent {
  color: var(--accent);
}
.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0 0 24px 0;
}
.cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-media {
  display: flex;
  justify-content: center;
}
.avatar {
  width: clamp(160px, 30vw, 260px);
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid color-mix(in srgb, var(--accent) 50%, transparent);
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.18), 0 0 0 6px color-mix(in srgb, var(--accent) 15%, transparent);
  transition: transform .35s ease;
  transform-origin: 50% 60%;
}
.avatar:hover {
  transform: translateY(-2px) scale(1.015);
}
@supports not (aspect-ratio: 1/1) {
  .avatar {
    height: auto;
  }
}
.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  line-height: 1.1;
  transition: transform 0.12s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 1px 1px rgba(2, 6, 23, 0.04);
  text-decoration: none;
}
.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
  background: var(--bg);
}
.btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-300) 100%);
  border-color: color-mix(in srgb, var(--accent) 75%, var(--border));
  color: #fff;
  box-shadow: var(--accent-glow);
}
.btn.primary:hover {
  filter: brightness(0.97);
  transform: translateY(-1px) scale(1.01);
}
.btn.outline {
  background: transparent;
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  color: var(--accent);
}
.btn.small {
  padding: 8px 12px;
  font-size: 0.95rem;
}

/* ========== Chips ========== */
.chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
.chip {
  list-style: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-brd);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  box-shadow: 0 1px 1px rgba(2, 6, 23, 0.04);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  caret-color: transparent;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  pointer-events: none;
  cursor: default;
}
.chip:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--glass-brd));
  box-shadow: 0 6px 18px rgba(2, 6, 23, 0.14);
}

/* ========== Projects Grid & Cards ========== */
.grid.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-brd);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
  backdrop-filter: blur(6px) saturate(120%);
  -webkit-backdrop-filter: blur(6px) saturate(120%);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(2, 6, 23, 0.22);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--glass-brd));
}
.card-body {
  padding: 18px;
}
.card h3 {
  margin: 0 0 8px 0;
}
.card .links {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

/* ========== Contacts ========== */
.contacts {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px 18px;
}
.contacts a {
  word-break: break-word;
}

/* ========== Footer ========== */
.site-footer {
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  color: var(--text-muted);
  text-align: center;
  padding: 24px 0;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* ========== Reveal-on-Scroll ========== */
.reveal {
  opacity: 0;
  transform: translateY(12px) scale(.98);
  transition: opacity .6s cubic-bezier(.22,.61,.36,1), transform .6s cubic-bezier(.22,.61,.36,1);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.reveal.is-inview {
  opacity: 1;
  transform: none;
}

/* ========== Responsive ========== */
@media (max-width: 980px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .nav {
    display: none; /* hidden by default on mobile */
    position: absolute;
    right: 16px;
    top: calc(var(--header-h) + 8px);
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-brd);
    border-radius: var(--radius-sm);
    padding: 8px;
    box-shadow: var(--shadow);
    z-index: 1000;
    backdrop-filter: blur(8px) saturate(130%);
    -webkit-backdrop-filter: blur(8px) saturate(130%);
  }
  .nav.open {
    display: flex;
  }
  .nav a {
    display: block;
  }
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .header-inner {
    height: 60px;
  }
  :root {
    --header-h: 60px;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 64px 0;
  }
}

/* ========== Reduced Motion ========== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto !important;
  }
}

/* Hide text caret in non-editable content to prevent stray vertical blue bar (caret browsing) */
:where(body, body *):not(input):not(textarea):not([contenteditable]) {
  caret-color: transparent;
}

/* Mobile-specific caret/selection/tap fixes for non-interactive chips block */
@media (max-width: 980px) {
  body { caret-color: transparent !important; }
  .chips, .chips * {
    -webkit-user-select: none !important;
    user-select: none !important;
    -webkit-touch-callout: none !important;
    -webkit-tap-highlight-color: transparent !important;
    pointer-events: none;
    caret-color: transparent !important;
  }
}