@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap");

/* ===== THEME VARIABLES ===== */

/* Dark Theme (Default) */
:root {
  --bs-primary: #3b82f6;
  --bs-secondary: #8b5cf6;

  /* Glass */
  --glass-bg: rgba(17, 24, 39, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);

  /* Text */
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;

  /* Surfaces */
  --body-bg: #050510;
  --header-bg: rgba(10, 15, 30, 0.7);
  --header-border: rgba(255, 255, 255, 0.05);
  --footer-bg: rgba(10, 15, 30, 0.5);
  --nav-link-color: rgba(255, 255, 255, 0.7);
  --nav-link-hover: #fff;
  --dropdown-item-color: #fff;
  --dropdown-divider: rgba(255, 255, 255, 0.1);

  /* Orbital / Canvas */
  --orbital-trail: rgba(10, 15, 30, 0.2);

  /* Components */
  --glass-subtle-bg: rgba(255, 255, 255, 0.05);
  --glass-subtle-border: rgba(255, 255, 255, 0.1);
  --glass-hover-bg: rgba(255, 255, 255, 0.08);
  --gradient-text-from: #60a5fa;
  --gradient-text-to: #a78bfa;
  --alert-info-bg: rgba(59, 130, 246, 0.1);
  --alert-info-border: rgba(59, 130, 246, 0.3);
  --alert-info-color: #93c5fd;
  --code-color: #e2e8f0;
}

/* Light Theme */
[data-theme="light"] {
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);

  --text-primary: #1e293b;
  --text-secondary: #64748b;

  --body-bg: #e8ecf1;
  --header-bg: rgba(255, 255, 255, 0.75);
  --header-border: rgba(0, 0, 0, 0.06);
  --footer-bg: rgba(255, 255, 255, 0.6);
  --nav-link-color: rgba(30, 41, 59, 0.7);
  --nav-link-hover: #0f172a;
  --dropdown-item-color: #1e293b;
  --dropdown-divider: rgba(0, 0, 0, 0.08);

  --orbital-trail: rgba(232, 236, 241, 0.25);

  --glass-subtle-bg: rgba(0, 0, 0, 0.03);
  --glass-subtle-border: rgba(0, 0, 0, 0.06);
  --glass-hover-bg: rgba(0, 0, 0, 0.05);
  --gradient-text-from: #2563eb;
  --gradient-text-to: #7c3aed;
  --alert-info-bg: rgba(59, 130, 246, 0.08);
  --alert-info-border: rgba(59, 130, 246, 0.25);
  --alert-info-color: #2563eb;
  --code-color: #334155;
}

/* ===== GLOBAL / COMMON ===== */

* {
  transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--text-primary);
  background-color: var(--body-bg);
  margin: 0;
  overflow-x: hidden;
}

.orbital-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* ===== GLASSMORPHISM UTILITIES ===== */

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  color: var(--text-primary);
}

.text-gradient {
  background: linear-gradient(135deg, var(--gradient-text-from) 0%, var(--gradient-text-to) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== HEADER & FOOTER ===== */

.glass-header {
  background: var(--header-bg) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--header-border) !important;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
}

.nav-link {
  color: var(--nav-link-color) !important;
  transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--nav-link-hover) !important;
}

.glass-footer {
  background: var(--footer-bg);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
}

.text-muted-glass {
  color: var(--text-secondary);
}

/* Dropdown overrides for light theme */
[data-theme="light"] .dropdown-menu.glass-panel .dropdown-item {
  color: var(--dropdown-item-color);
}
[data-theme="light"] .dropdown-menu.glass-panel .dropdown-item:hover {
  background: var(--glass-hover-bg);
}
[data-theme="light"] .dropdown-menu.glass-panel .dropdown-divider {
  border-color: var(--dropdown-divider);
}
[data-theme="light"] .dropdown-menu.glass-panel .dropdown-item.text-white {
  color: var(--dropdown-item-color) !important;
}
[data-theme="light"] .dropdown-menu.glass-panel .dropdown-item.text-muted {
  color: var(--text-secondary) !important;
}

/* ===== HERO SECTION ===== */

.hero {
  padding: 6rem 0;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero.sm {
  padding: 4rem 0;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  font-weight: 800;
  letter-spacing: -1px;
}

.hero p {
  font-size: 1.5rem;
  color: var(--text-secondary);
}

/* ===== ANIMATIONS ===== */

.fade-in-up {
  animation: fadeInUp 0.8s cubic-bezier(0.165, 0.84, 0.44, 1) forwards;
  opacity: 0;
  transform: translateY(20px);
}

.delay-1 {
  animation-delay: 0.1s;
}
.delay-2 {
  animation-delay: 0.2s;
}
.delay-3 {
  animation-delay: 0.3s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== ALERT INFO ===== */

.alert-info.glass {
  background: var(--alert-info-bg);
  border: 1px solid var(--alert-info-border);
  color: var(--alert-info-color);
  border-radius: 12px;
}

/* ===== SECTION OVERRIDES ===== */

.bg-light {
  background-color: transparent !important;
}

/* ===== THEME TOGGLE BUTTON ===== */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-subtle-bg);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1.15rem;
  padding: 0;
  outline: none;
}

.theme-toggle:hover {
  background: var(--glass-hover-bg);
  transform: rotate(30deg) scale(1.1);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.3);
}

/* Light theme specific overrides */
[data-theme="light"] .text-white {
  color: var(--text-primary) !important;
}

[data-theme="light"] .btn-outline-light {
  color: var(--text-primary);
  border-color: var(--glass-border);
}

[data-theme="light"] .btn-outline-light:hover {
  background: var(--glass-hover-bg);
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] code {
  color: var(--code-color);
}

[data-theme="light"] .navbar-toggler-icon {
  filter: invert(1) grayscale(100%) brightness(0.5);
}