/* ============================
   GOOGLE FONTS
   ============================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================
   CSS CUSTOM PROPERTIES
   Dark Theme (default)
   ============================ */
:root,
[data-theme="dark"] {
  /* --- Brand Palette --- */
  --accent-primary: #7c3aed;
  /* Vivid Violet */
  --accent-secondary: #06b6d4;
  /* Cyan */
  --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #06b6d4 100%);

  /* --- Background --- */
  --bg-base: #0a0a0f;
  /* Near-black */
  --bg-surface: #111118;
  /* Card/section bg */
  --bg-elevated: #1a1a2e;
  /* Elevated panels */

  /* --- Glass Effect --- */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --glass-blur: blur(16px);
  --glass-bg-hover: rgba(255, 255, 255, 0.08);

  /* --- Text --- */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;
  --text-accent: #7c3aed;

  /* --- UI Elements --- */
  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.3);

  /* --- Status --- */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #06b6d4;

  /* --- Scroll --- */
  scrollbar-color: var(--accent-primary) var(--bg-surface);
}

/* ============================
   Light Theme Overrides
   ============================ */
[data-theme="light"] {
  --accent-primary: #6d28d9;
  --accent-secondary: #0891b2;
  --accent-gradient: linear-gradient(135deg, #6d28d9 0%, #0891b2 100%);

  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;

  --glass-bg: rgba(255, 255, 255, 0.70);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.10);
  --glass-bg-hover: rgba(255, 255, 255, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #6d28d9;

  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(109, 40, 217, 0.15);

  scrollbar-color: var(--accent-primary) var(--bg-elevated);
}

/* ============================
   SPACING & TYPOGRAPHY TOKENS
   ============================ */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  --navbar-height: 4rem;
  --container-max: 1200px;
  --section-padding: var(--space-24) var(--space-4);
}

/* ============================
   CSS RESET
   ============================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-base);
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: var(--radius-full);
}

/* Selection */
::selection {
  background: var(--accent-primary);
  color: white;
}

/* ============================
   GLASS EFFECT CORE
   Apply: class="glass"
   ============================ */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-lg);
  transition:
    background var(--transition-base),
    box-shadow var(--transition-base);
}

.glass:hover {
  background: var(--glass-bg-hover);
  box-shadow: var(--glass-shadow), var(--shadow-glow);
}

/* Theme Transition */
.theme-transitioning,
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
  transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease !important;
}

#theme-toggle {
  position: relative;
  overflow: hidden;
}

#theme-icon {
  display: inline-block;
  transition: transform 0.3s ease;
}

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

[data-theme="dark"] #theme-icon {
  color: var(--accent-secondary);
}

/* Background Meshes */
[data-theme="dark"] body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(124, 58, 237, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(124, 58, 237, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

[data-theme="light"] body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(109, 40, 217, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(8, 145, 178, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

[data-theme="dark"] .avatar-img {
  filter: drop-shadow(0 0 20px rgba(124, 58, 237, 0.4)) brightness(0.95);
}

[data-theme="light"] .avatar-img {
  filter: drop-shadow(0 0 20px rgba(109, 40, 217, 0.2)) brightness(1.02);
}