/* === Reset & Base === */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Light theme */
  --bg: #fafafa;
  --bg-alt: #f0f2f5;
  --text: #1a1a2e;
  --text-secondary: #555;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --card-bg: #fff;
  --card-border: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --tag-bg: #e8edf5;
  --tag-text: #334155;
  --header-bg: rgba(250, 250, 250, 0.92);
  --badge-live-bg: #16a34a;
  --badge-soon-bg: #94a3b8;
  --divider: #e2e8f0;
  --footer-bg: #1a1a2e;
  --footer-text: #cbd5e1;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --card-bg: #1e293b;
  --card-border: #334155;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --tag-bg: #334155;
  --tag-text: #cbd5e1;
  --header-bg: rgba(15, 23, 42, 0.92);
  --badge-live-bg: #22c55e;
  --badge-soon-bg: #64748b;
  --divider: #334155;
  --footer-bg: #020617;
  --footer-text: #94a3b8;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Header === */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--divider);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

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

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--divider);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.btn-icon:hover {
  color: var(--text);
  border-color: var(--text-secondary);
  background: var(--bg-alt);
}

.lang-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* Sun/moon toggle */
[data-theme="light"] .icon-moon,
[data-theme="dark"] .icon-sun {
  display: none;
}

/* === Hero === */
.hero {
  padding: 6rem 0 4rem;
  text-align: center;
}

.hero-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

/* === Sections === */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1rem;
}

.section-text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* === Tags === */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* === Grid === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.25rem;
}

/* === Cards (Expertise) === */
.card {
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card-icon {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* === Project Cards === */
.projects-grid {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.project-card {
  display: block;
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.project-card--live {
  border-color: var(--badge-live-bg);
  cursor: pointer;
}

.project-card--live:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .project-card--live:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.project-card--soon {
  opacity: 0.7;
}

.project-status {
  margin-bottom: 0.75rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
}

.badge-live {
  background: var(--badge-live-bg);
}

.badge-soon {
  background: var(--badge-soon-bg);
}

.project-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.project-domain {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* === Footer === */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 2rem;
}

.footer .section-title {
  color: #fff;
}

.footer-text {
  color: var(--footer-text);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--footer-text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.contact-link:hover {
  color: #fff;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--footer-text);
  opacity: 0.6;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
}

/* === Scroll animations === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 640px) {
  .hero {
    padding: 4rem 0 3rem;
  }

  .section {
    padding: 3rem 0;
  }

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

  .contact-links {
    flex-direction: column;
    gap: 1rem;
  }
}