/* Theme: Light and Dark with modern, professional look */

:root {
  --bg: #f7f8fb;
  --text: #0b1220;
  --muted: #5f6b7a;
  --card: #ffffff;
  --border: #e6eaf0;
  --accent: #6c5ce7; /* indigo */
  --accent-2: #00d4ff; /* cyan */
  --ring: rgba(108, 92, 231, 0.35);
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.06);
  --radius: 14px;
  --container: 1100px;
  --transition-fast: 160ms ease;
  --transition-slow: 360ms cubic-bezier(.2,.8,.2,1);
}

/* Dark theme variables applied when data-theme="dark" is set on html */
html[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e6eaf0;
  --muted: #9aa4b2;
  --card: #121b2d;
  --border: #1f2a3b;
  --accent: #7b6cff;
  --accent-2: #2dd4bf;
  --ring: rgba(123, 108, 255, 0.5);
  --shadow: 0 12px 38px rgba(2, 6, 23, 0.55);
}

/* Respect system preference on first visit (before JS sets a choice) */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --bg: #0b1220;
    --text: #e6eaf0;
    --muted: #9aa4b2;
    --card: #121b2d;
    --border: #1f2a3b;
    --accent: #7b6cff;
    --accent-2: #2dd4bf;
    --ring: rgba(123, 108, 255, 0.5);
    --shadow: 0 12px 38px rgba(2, 6, 23, 0.55);
  }
}

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

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

.page-container {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 24px;
}

h1, h2, h3 {
  margin: 0 0 12px 0;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 600;
  color: var(--text);
}

p {
  margin: 0 0 12px 0;
  color: var(--text);
}
p + p {
  margin-top: 10px;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  padding-bottom: 4px;
}

/* Buttons and links */
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0)) ;
  backdrop-filter: saturate(1.2) blur(2px);
  box-shadow: var(--shadow);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}
html[data-theme="dark"] .back-btn {
  background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0));
}
.back-btn:hover {
  transform: translateY(-1px);
  border-color: color-mix(in oklab, var(--border), var(--accent) 30%);
  text-decoration: none;
}

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}
.theme-toggle .icon::before {
  content: "🌙";
  display: inline-block;
  transform: translateY(1px);
}
html[data-theme="dark"] .theme-toggle .icon::before {
  content: "☀️";
}
.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: color-mix(in oklab, var(--border), var(--accent) 30%);
  box-shadow: 0 14px 35px rgba(0,0,0,0.08);
}
.theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 6px var(--ring);
}

/* Cards and content layout */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px;
  box-shadow: var(--shadow);
  transition: background-color var(--transition-slow), border-color var(--transition-slow), transform var(--transition-fast);
}

.about-content {
  display: grid;
  grid-template-columns: 2fr 1.1fr;
  gap: 24px;
  align-items: start;
  margin-top: 18px;
}

.about-text {
  font-size: 1.02rem;
  color: var(--text);
}

.contact-info h2 {
  margin-bottom: 6px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}
.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: color-mix(in oklab, var(--card), var(--accent) 0%);
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.contact-links a:hover {
  background: color-mix(in oklab, var(--card), var(--accent) 8%);
  border-color: color-mix(in oklab, var(--border), var(--accent) 30%);
  text-decoration: none;
  transform: translateY(-1px);
}

/* Subtle animated gradient border for cards on hover */
.card:hover {
  border-color: color-mix(in oklab, var(--border), var(--accent) 35%);
}

/* Responsive */
@media (max-width: 900px) {
  .about-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 18px;
  }
  .site-header {
    padding-top: 16px;
  }
  .theme-toggle, .back-btn {
    padding: 9px 12px;
  }
}

/* Nice selection color */
::selection {
  background: color-mix(in oklab, var(--accent), var(--accent-2) 30%);
  color: #fff;
}

/* ========== New: Global Navigation, Brand, Hero, Buttons, Grids, Footer ========== */
.brand {
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 60%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand .dot {
  color: var(--accent-2);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: var(--muted);
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}
.site-nav a:hover {
  color: var(--text);
  background: color-mix(in oklab, var(--card), var(--accent) 8%);
  border-color: color-mix(in oklab, var(--border), var(--accent) 25%);
  transform: translateY(-1px);
}
.site-nav a[aria-current="page"] {
  color: var(--text);
  background: color-mix(in oklab, var(--card), var(--accent) 12%);
  border-color: color-mix(in oklab, var(--border), var(--accent) 35%);
  font-weight: 600;
}

.hero {
  margin-top: 18px;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    radial-gradient(1200px 300px at 0% 0%, color-mix(in oklab, var(--accent), transparent 90%), transparent),
    radial-gradient(1200px 300px at 100% 100%, color-mix(in oklab, var(--accent-2), transparent 90%), transparent),
    var(--card);
  box-shadow: var(--shadow);
}
.hero h1 {
  margin-bottom: 8px;
}
.hero p.lead {
  color: var(--muted);
  font-size: clamp(16px, 2.2vw, 18px);
  margin-bottom: 14px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}
.btn:hover {
  transform: translateY(-1px);
  border-color: color-mix(in oklab, var(--border), var(--accent) 35%);
  text-decoration: none;
}
.btn.primary {
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent), var(--card) 10%), color-mix(in oklab, var(--accent-2), var(--card) 10%));
  color: #fff;
  border: 1px solid transparent;
}
html[data-theme="dark"] .btn.primary {
  color: #0b1220;
}
.btn.ghost {
  background: color-mix(in oklab, var(--card), var(--accent) 6%);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  margin-top: 18px;
}
.grid .col-4 { grid-column: span 4; }
.grid .col-6 { grid-column: span 6; }
.grid .col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .grid .col-4, .grid .col-6 { grid-column: span 12; }
}

.card .card-title {
  font-weight: 600;
  margin-bottom: 6px;
}
.card .card-meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 4px;
}

footer.site-footer {
  margin-top: 30px;
  padding: 22px 0 26px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}
footer .social {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
footer .social a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
footer .social a:hover {
  color: var(--text);
  background: color-mix(in oklab, var(--card), var(--accent) 8%);
}