:root {
  color-scheme: light dark;
  --max-width: 1200px;
  --gap: clamp(1rem, 2vw, 2.5rem);
  --surface: linear-gradient(135deg, #eef2ff 0%, #f8fafc 60%, #eff6ff 100%);
  --border-radius: 18px;
  --transition: all 180ms ease;
  --link: #2563eb;
  --link-hover: #1e3a8a;
  --card-bg: rgba(255, 255, 255, 0.82);
  --card-text: #1f2a37;
  --card-shadow: 0 22px 45px -30px rgba(15, 23, 42, 0.45);
  --card-shadow-hover: 0 28px 60px -28px rgba(15, 23, 42, 0.55);
  --body-color: #0f172a;
  --muted-color: #475569;
  --card-body-color: #334155;
  --meta-color: #64748b;
  --meta-badge-bg: rgba(15, 23, 42, 0.05);
  --meta-badge-text: #64748b;
  --footer-color: #475569;
  --nav-bg: rgba(255, 255, 255, 0.75);
  --nav-border: rgba(37, 99, 235, 0.25);
  --nav-text: var(--link);
  --nav-hover-text: #fff;
  --empty-bg: rgba(148, 163, 184, 0.12);
  --empty-color: #64748b;
  --error-bg: rgba(239, 68, 68, 0.1);
  --error-border: rgba(239, 68, 68, 0.4);
  --error-text: #b91c1c;
  --toggle-bg: rgba(15, 23, 42, 0.25);
  --toggle-hover: rgba(15, 23, 42, 0.4);
  --toggle-border: rgba(255, 255, 255, 0.5);
  --toggle-color: #fff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  background: var(--surface);
  color: var(--body-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-header {
  position: relative;
  background: url("assets/hero.jpg") center/cover no-repeat;
  color: #fff;
  padding: clamp(3rem, 6vw, 5rem) 1.5rem;
  text-align: center;
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.25) 0%, rgba(15, 23, 42, 0.6) 100%);
  pointer-events: none;
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.theme-toggle {
  position: absolute;
  top: clamp(1rem, 4vw, 1.5rem);
  right: clamp(1rem, 4vw, 1.5rem);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.45rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--toggle-bg);
  color: var(--toggle-color);
  border: 1px solid var(--toggle-border);
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(8px);
  z-index: 2;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--toggle-hover);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.45);
}

.theme-toggle__icon {
  font-size: 1.05rem;
}

.contact-links {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  text-decoration: none;
  font-weight: 600;
  color: #fff;
  background: rgba(15, 23, 42, 0.32);
  backdrop-filter: blur(8px);
  transition: var(--transition);
}

.contact-links__icon {
  font-size: 1.05rem;
}

.contact-links a:hover,
.contact-links a:focus {
  background: rgba(15, 23, 42, 0.55);
  transform: translateY(-1px);
}

main {
  width: min(92vw, var(--max-width));
  margin: 0 auto;
  flex: 1;
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  display: grid;
  gap: clamp(3rem, 5vw, 4.5rem);
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.page-nav a {
  text-decoration: none;
  color: var(--nav-text);
  border: 1px solid var(--nav-border);
  border-radius: 999px;
  padding: 0.35rem 1.1rem;
  font-weight: 600;
  transition: var(--transition);
  background: var(--nav-bg);
  backdrop-filter: blur(6px);
}

.page-nav a:hover,
.page-nav a:focus {
  color: var(--nav-hover-text);
  background: var(--link);
  border-color: transparent;
}

.portfolio-sections {
  display: grid;
  gap: clamp(3rem, 5vw, 4.25rem);
}

.portfolio-section {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 0.35rem;
}

.section-heading p {
  color: var(--muted-color);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
  padding: 1rem 1.25rem;
  border-radius: 12px;
  text-align: center;
  font-weight: 600;
}

.empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--empty-color);
  padding: 2rem 1rem;
  border-radius: 12px;
  background: var(--empty-bg);
}

.card {
  display: grid;
  gap: 1.1rem;
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--border-radius);
  padding: clamp(1.1rem, 2vw, 1.5rem);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover,
.card:focus-within {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 228px;
  max-height: 228px;
  border-radius: calc(var(--border-radius) - 6px);
  overflow: hidden;
  background: #e2e8f0;
  display: grid;
  place-items: center;
  justify-self: center;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 240ms ease;
}

.card:hover .card-image img {
  transform: scale(1.04);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  font-size: 0.85rem;
  color: var(--meta-color);
}

.card-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--meta-badge-bg);
  color: var(--meta-badge-text);
}

.card h3 {
  font-size: 1.25rem;
  line-height: 1.3;
}

.card p {
  color: var(--card-body-color);
}

.card-actions {
  margin-top: auto;
}

.card-actions a {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  text-decoration: none;
  font-weight: 600;
  color: #fff;
  background: var(--link);
  padding: 0.55rem 1.1rem;
  border-radius: 0.85rem;
  transition: var(--transition);
  box-shadow: 0 14px 30px -20px rgba(37, 99, 235, 0.9);
}

.card-actions a:hover,
.card-actions a:focus {
  background: var(--link-hover);
  transform: translateY(-1px);
}

.page-footer {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--footer-color);
}

@media (max-width: 768px) {
  .page-header {
    text-align: left;
  }

  .header-content {
    gap: 0.9rem;
  }

  .page-nav {
    justify-content: flex-start;
  }
}

html[data-theme="light"] {
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --surface: radial-gradient(circle at top, #0f172a 0%, #111827 45%, #0f172a 100%);
  --body-color: #e2e8f0;
  --muted-color: #cbd5f5;
  --card-body-color: #cbd5f5;
  --meta-color: #cbd5f5;
  --meta-badge-bg: rgba(148, 163, 184, 0.18);
  --meta-badge-text: #cbd5f5;
  --card-bg: rgba(15, 23, 42, 0.8);
  --card-text: #f8fafc;
  --card-shadow: 0 22px 45px -30px rgba(15, 23, 42, 0.8);
  --card-shadow-hover: 0 28px 60px -28px rgba(15, 23, 42, 0.9);
  --nav-bg: rgba(15, 23, 42, 0.6);
  --nav-border: rgba(148, 163, 184, 0.4);
  --nav-text: #93c5fd;
  --nav-hover-text: #fff;
  --footer-color: #cbd5f5;
  --empty-bg: rgba(148, 163, 184, 0.08);
  --empty-color: #cbd5f5;
  --error-bg: rgba(239, 68, 68, 0.18);
  --error-border: rgba(239, 68, 68, 0.4);
  --error-text: #fecaca;
  --toggle-bg: rgba(148, 163, 184, 0.18);
  --toggle-hover: rgba(148, 163, 184, 0.25);
  --toggle-border: rgba(148, 163, 184, 0.4);
  --toggle-color: #f8fafc;
}

html[data-theme="dark"] .page-header {
  background: url("assets/hero.jpg") center/cover no-repeat;
}