/* ============================================
   MAIN.CSS — Variabel, Reset, Layout Dasar
   ============================================ */

:root {
  --bg-primary: #FFFDF5;
  --bg-secondary: #F8F8F8;
  --bg-card: #FFFFFF;
  --text-primary: #1A1A1A;
  --text-secondary: #333333;
  --border-color: #000000;
  --border-width: 2px;
  
  --neon-cyan: #00FFFF;
  --neon-magenta: #FF00FF;
  --neon-yellow: #FFDD00;
  --neon-green: #00FF41;
  --neon-red: #FF3C00;
  --neon-orange: #FF8C00;
  
  --shadow-hard: 4px 4px 0 #000;
  --font-display: 'Clash Display', 'Space Grotesk', sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Archivo', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius: 0;
  --transition: 0.15s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  padding-bottom: 80px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
}
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
  color: var(--text-primary);
  text-decoration: none;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

input, textarea, select {
  font-family: var(--font-body);
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  width: 100%;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 17px;
}

#app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 23px 0 17px;
  border-bottom: var(--border-width) solid var(--border-color);
  margin-bottom: 23px;
}
#app-header h1 {
  font-size: 1.8rem;
  letter-spacing: -0.04em;
}
#app-header button {
  font-size: 1.5rem;
  padding: 5px;
}

#app-main {
  flex: 1;
}

.page {
  display: none;
  animation: pageSnap 0.2s ease;
}
.page.active {
  display: block;
}

@keyframes pageSnap {
  0% { opacity: 0; transform: translateY(5px); }
  100% { opacity: 1; transform: translateY(0); }
}

#app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: var(--border-width) solid var(--border-color);
  display: flex;
  justify-content: space-around;
  padding: 8px 0 env(safe-area-inset-bottom);
  z-index: 1000;
  box-shadow: 0 -4px 0 #000;
}
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 5px 12px;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
  color: var(--text-secondary);
}
.nav-btn .nav-icon {
  font-size: 1.6rem;
  line-height: 1;
}
.nav-btn .nav-label {
  margin-top: 2px;
}
.nav-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--neon-cyan);
  background: var(--bg-secondary);
}
.nav-btn:hover {
  transform: translateY(-2px);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 23px;
  margin-bottom: 23px;
}
.col {
  flex: 1;
  min-width: 250px;
}

.text-mono {
  font-family: var(--font-mono);
}

.text-center { text-align: center; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 23px; }
.mt-2 { margin-top: 23px; }

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border: 1px solid var(--bg-primary);
}

@media (min-width: 768px) {
  #app {
    padding: 0 30px;
  }
  #app-header h1 {
    font-size: 2.5rem;
  }
  #app-nav {
    position: sticky;
    top: 0;
    border-bottom: var(--border-width) solid var(--border-color);
    border-top: none;
    box-shadow: none;
    padding: 0 30px;
    background: var(--bg-primary);
  }
  #app-nav .nav-btn {
    flex-direction: row;
    gap: 8px;
    padding: 12px 20px;
  }
  .nav-btn .nav-icon {
    font-size: 1.2rem;
  }
}