/**
 * Apple Theme & Design System Tokens for DownMe
 * Minimalist HIG aesthetic: Frosted glass materials, hairline borders,
 * dynamic dark/light modes, Apple spring physics, and zero-overflow responsive base.
 */

:root {
  /* Color Palette - Dark Mode (Default) */
  --bg-primary: #000000;
  --bg-secondary: #0c0c0e;
  --bg-tertiary: #16161a;
  --bg-surface: rgba(255, 255, 255, 0.05);
  --bg-surface-elevated: rgba(255, 255, 255, 0.08);
  --bg-surface-active: rgba(255, 255, 255, 0.14);
  --bg-surface-hover: rgba(255, 255, 255, 0.09);
  --bg-glass: rgba(18, 18, 22, 0.75);
  --bg-glass-elevated: rgba(26, 26, 32, 0.85);
  --bg-island: rgba(15, 15, 18, 0.92);

  /* Hairline Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);
  --border-focus: rgba(10, 132, 255, 0.6);
  --border-divider: rgba(255, 255, 255, 0.06);

  /* Typography Colors */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.65);
  --text-tertiary: rgba(255, 255, 255, 0.42);
  --text-quaternary: rgba(255, 255, 255, 0.22);
  --text-inverse: #000000;

  /* Apple Accent Colors */
  --accent-blue: #0a84ff;
  --accent-blue-hover: #0071e3;
  --accent-blue-glow: rgba(10, 132, 255, 0.35);
  --accent-green: #30d158;
  --accent-green-glow: rgba(48, 209, 88, 0.35);
  --accent-amber: #ffd60a;
  --accent-amber-glow: rgba(255, 214, 10, 0.35);
  --accent-red: #ff453a;
  --accent-red-glow: rgba(255, 69, 58, 0.35);
  --accent-purple: #bf5af2;

  /* Platform Identity Colors */
  --platform-youtube: #ff0000;
  --platform-youtube-glow: rgba(255, 0, 0, 0.35);
  --platform-facebook: #1877f2;
  --platform-facebook-glow: rgba(24, 119, 242, 0.35);
  --platform-tiktok: #00f2fe;
  --platform-tiktok-accent: #fe2c55;
  --platform-tiktok-glow: rgba(0, 242, 254, 0.35);
  --platform-pinterest: #e60023;
  --platform-pinterest-glow: rgba(230, 0, 35, 0.35);

  /* Material Glassmorphism */
  --glass-blur: blur(24px) saturate(190%);
  --glass-blur-sm: blur(16px) saturate(180%);
  --glass-blur-lg: blur(36px) saturate(200%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-island: 0 12px 32px rgba(0, 0, 0, 0.55), 0 0 0 1px var(--border-subtle);
  --shadow-glow: 0 0 28px var(--accent-blue-glow);

  /* Radii */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-pill: 9999px;

  /* Transitions & Apple Spring Curves */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 150ms var(--ease-spring);
  --transition-normal: 250ms var(--ease-spring);
  --transition-smooth: 400ms var(--ease-spring);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #fbfbfd;
  --bg-secondary: #f2f2f7;
  --bg-tertiary: #e5e5ea;
  --bg-surface: rgba(255, 255, 255, 0.82);
  --bg-surface-elevated: #ffffff;
  --bg-surface-active: rgba(0, 0, 0, 0.08);
  --bg-surface-hover: rgba(0, 0, 0, 0.04);
  --bg-glass: rgba(255, 255, 255, 0.8);
  --bg-glass-elevated: rgba(255, 255, 255, 0.92);
  --bg-island: rgba(255, 255, 255, 0.96);

  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-hover: rgba(0, 0, 0, 0.14);
  --border-focus: rgba(0, 113, 227, 0.6);
  --border-divider: rgba(0, 0, 0, 0.06);

  --text-primary: #1d1d1f;
  --text-secondary: rgba(0, 0, 0, 0.62);
  --text-tertiary: rgba(0, 0, 0, 0.4);
  --text-quaternary: rgba(0, 0, 0, 0.2);
  --text-inverse: #ffffff;

  --accent-blue: #0071e3;
  --accent-blue-hover: #0077ed;
  --accent-blue-glow: rgba(0, 113, 227, 0.25);
  --accent-green: #34c759;
  --accent-green-glow: rgba(52, 199, 89, 0.25);
  --accent-amber: #ff9f0a;
  --accent-amber-glow: rgba(255, 159, 10, 0.25);
  --accent-red: #ff3b30;
  --accent-red-glow: rgba(255, 59, 48, 0.25);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --shadow-island: 0 12px 32px rgba(0, 0, 0, 0.1), 0 0 0 1px var(--border-subtle);
}

/* CSS Reset & Baseline */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  overflow-x: hidden;
  max-width: 100vw;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Base Container & Grid */
.app-container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

@media (max-width: 480px) {
  .app-container {
    padding: 16px 14px;
  }
}

/* Frosted Glass Surface Utility */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.glass-panel:hover {
  border-color: var(--border-hover);
}

.glass-pill {
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}