/* ===================================================
   CIVITECT - GLOBAL STYLES
   Version: 1.0
   Description: Design system untuk kalkulator teknik
   =================================================== */

/* ===== Theme Variables ===== */
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --card: #ffffff;
  --card-hover: #f8fafc;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --civil: #f59e0b;
  --civil-bg: #fef3c7;
  --elec: #0891b2;
  --elec-bg: #cffafe;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
}

:root[data-theme="dark"] {
  --bg: #0f172a;
  --bg-subtle: #1e293b;
  --card: #1e293b;
  --card-hover: #334155;
  --border: #334155;
  --border-hover: #475569;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --civil: #fbbf24;
  --civil-bg: rgba(251,191,36,.1);
  --elec: #22d3ee;
  --elec-bg: rgba(34,211,238,.1);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.5), 0 2px 4px -1px rgba(0,0,0,.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  transition: background .2s ease, color .2s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Navigation ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background .2s ease, border-color .2s ease;
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.025em;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--civil), var(--elec));
  display: grid;
  place-items: center;
  color: #fff;
}

.logo-icon svg {
  width: 18px;
  height: 18px;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all .2s ease;
}

.theme-toggle:hover {
  background: var(--card-hover);
  border-color: var(--border-hover);
  color: var(--text);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

:root[data-theme="light"] .theme-toggle .moon { display: block; }
:root[data-theme="light"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }

/* ===== Hero Section ===== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 48px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-badge strong {
  color: var(--accent);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* ===== Search ===== */
.search-container {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 14px 16px 14px 48px;
  background: var(--bg-subtle);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  transition: all .2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* ===== Main Content ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section {
  margin-top: 64px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.section-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.section-dot.civil {
  background: var(--civil);
}

.section-dot.elec {
  background: var(--elec);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  flex: 1;
}

.section-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* ===== Cards ===== */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  transition: all .2s ease;
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card.civil:hover {
  border-color: var(--civil);
}

.card.elec:hover {
  border-color: var(--elec);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: grid;
  place-items: center;
}

.card.civil .card-icon {
  background: var(--civil-bg);
  color: var(--civil);
}

.card.elec .card-icon {
  background: var(--elec-bg);
  color: var(--elec);
}

.card-icon svg {
  width: 22px;
  height: 22px;
}

.card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.card-link {
  margin-top: auto;
  padding-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all .2s ease;
}

.card:hover .card-link {
  gap: 10px;
}

.card.civil:hover .card-link {
  color: var(--civil);
}

.card.elec:hover .card-link {
  color: var(--elec);
}

/* ===== Footer ===== */
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.footer-text strong {
  color: var(--text);
  font-weight: 600;
}

.footer-refs {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color .2s ease;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ===== Utility ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .navbar-inner {
    padding: 12px 16px;
  }

  .hero {
    padding: 48px 16px 32px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  main {
    padding: 0 16px 60px;
  }

  .section {
    margin-top: 48px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card {
    padding: 20px;
  }

  .footer-links {
    gap: 16px;
  }
}

@media (min-width: 641px) and (max-width: 960px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 961px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}