/* ========================================
   CSS CUSTOM PROPERTIES (COLOR SYSTEM)
   ======================================== */

:root {
  /* Default Theme: Indigo Blue Light */
  --color-primary: #6366f1;
  --color-primary-rgb: 99, 102, 241;
  --color-accent: #f59e0b;
  --color-accent-rgb: 245, 158, 11;
  --color-bg: #f8fafc;
  --color-bg-rgb: 248, 250, 252;
  --color-nav: #ffffff;
  --color-nav-rgb: 255, 255, 255;
  --color-nav-text: #1e293b;
  --color-text: #1e293b;
  --color-text-rgb: 30, 41, 59;
  --color-card: #ffffff;
  --color-card-rgb: 255, 255, 255;
  --color-border: #e2e8f0;
  --color-border-rgb: 226, 232, 240;
}

/* ========================================
   BASE STYLES
   ======================================== */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--color-bg);
  color: var(--color-text);
  transition: background 0.3s ease, color 0.3s ease;
}

/* ========================================
   SCROLLBAR CUSTOM
   ======================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 99px; }

/* ========================================
   DESKTOP NAVIGATION LINKS
   ======================================== */
.desktop-nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 0.625rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-nav-text);
  opacity: 0.7;
  transition: all 0.2s ease;
  position: relative;
}

.desktop-nav-link:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  color: var(--color-primary);
}

.desktop-nav-active {
  opacity: 1 !important;
  background: color-mix(in srgb, var(--color-primary) 12%, transparent) !important;
  color: var(--color-primary) !important;
  font-weight: 600;
}

/* ========================================
   SLIDE MENU NAV LINKS
   ======================================== */
.slide-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-nav-text);
  opacity: 0.7;
  transition: all 0.2s ease;
}

.slide-nav-link:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  color: var(--color-primary);
}

.slide-nav-active {
  opacity: 1 !important;
  background: color-mix(in srgb, var(--color-primary) 12%, transparent) !important;
  color: var(--color-primary) !important;
  font-weight: 600;
}

.slide-nav-active svg {
  color: var(--color-primary);
}

/* ========================================
   BOTTOM NAVIGATION (MOBILE)
   ======================================== */
.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  text-decoration: none;
  color: var(--color-nav-text);
  opacity: 0.5;
  transition: all 0.2s ease;
  font-size: 0.6rem;
  font-weight: 500;
  position: relative;
}

.bottom-nav-item span {
  font-size: 0.6rem;
  line-height: 1;
}

.bottom-nav-item:hover {
  opacity: 0.8;
  color: var(--color-primary);
}

.bottom-nav-active {
  opacity: 1 !important;
  color: var(--color-primary) !important;
}

.bottom-nav-active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* ========================================
   BANNER SECTION
   ======================================== */
.banner-glow {
  position: absolute;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  opacity: 0.15;
  filter: blur(3rem);
  pointer-events: none;
}

.badge-primary {
  display: inline-block;
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  color: var(--color-primary);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn-primary-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: 0.75rem;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  background: var(--color-primary);
  color: #ffffff;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px color-mix(in srgb, var(--color-primary) 40%, transparent);
}

.btn-primary-main:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px color-mix(in srgb, var(--color-primary) 50%, transparent);
}

.btn-outline-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: 0.75rem;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--color-nav-text);
  border: 2px solid var(--color-border);
  transition: all 0.2s ease;
}

.btn-outline-main:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ========================================
   STAT CARDS (BANNER)
   ======================================== */
.stat-card {
  padding: 1.25rem;
  border-radius: 1rem;
  background: color-mix(in srgb, var(--color-nav) 80%, transparent);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.1);
}

/* ========================================
   FEATURE CARDS
   ======================================== */
.feature-card {
  padding: 1.5rem;
  border-radius: 1.25rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border-color: var(--color-primary);
}

.icon-box {
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease, color 0.3s ease;
}

.feature-card:hover .icon-box {
  background: var(--color-primary) !important;
  color: white !important;
}

/* ========================================
   FOOTER LINKS
   ======================================== */
.footer-link {
  font-size: 0.875rem;
  text-decoration: none;
  color: var(--color-nav-text);
  opacity: 0.6;
  transition: all 0.2s ease;
}

.footer-link:hover {
  opacity: 1;
  color: var(--color-primary);
}

/* ========================================
   COLOR PANEL PRESET BUTTONS
   ======================================== */
.preset-btn {
  padding: 0.625rem 0.5rem;
  border-radius: 0.75rem;
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
  font-size: 0.7rem;
  font-weight: 600;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
}

.preset-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.preset-btn.active-preset {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.preset-swatch {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  display: flex;
  overflow: hidden;
}

.preset-swatch span {
  flex: 1;
  display: block;
}

/* ========================================
   DARK MODE TOGGLE
   ======================================== */
#darkModeToggle.dark-on {
  background: var(--color-primary) !important;
}

#darkModeToggle.dark-on #darkModeThumb {
  transform: translateX(1.5rem);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.05); opacity: 0.6; }
  100% { transform: scale(1); opacity: 0.8; }
}

.feature-card { animation: fadeInUp 0.5s ease both; }
.feature-card:nth-child(1) { animation-delay: 0.05s; }
.feature-card:nth-child(2) { animation-delay: 0.1s; }
.feature-card:nth-child(3) { animation-delay: 0.15s; }
.feature-card:nth-child(4) { animation-delay: 0.2s; }
.feature-card:nth-child(5) { animation-delay: 0.25s; }
.feature-card:nth-child(6) { animation-delay: 0.3s; }

#centerBtn {
  animation: pulse-ring 2.5s ease-in-out infinite;
}

/* ========================================
   SAFE AREA (iPhone notch)
   ======================================== */
#bottomNav {
  padding-bottom: env(safe-area-inset-bottom, 0);
}

/* ========================================
   UTILITY
   ======================================== */
.invisible { visibility: hidden; }
.visible { visibility: visible; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* Transition for theme switching */
*, *::before, *::after {
  transition-property: background-color, border-color, color;
  transition-duration: 0.25s;
  transition-timing-function: ease;
}

/* Override transition for transforms (don't slow them down) */
.feature-card,
.stat-card,
.btn-primary-main,
.btn-outline-main,
.preset-btn,
.icon-box,
#slideMenu,
#colorPanel {
  transition: all 0.3s ease;
}

/* ========================================
   RESPONSIVE: min-h banner mobile
   ======================================== */
@media (max-width: 1023px) {
  #banner { min-height: 380px; }
  main { padding-bottom: 5rem; }
}