/* ============================================================
   BRIEFAIZ DESIGN SYSTEM (V6.5)
   Support: Light / Dark Mode
   Niche: AI for Lawyers
   ============================================================ */


:root {
  /* Light Mode Tokens */
  --bg: #F8FAFC;
  --text: #0F172A;
  --text-muted: #475569;
  --primary: #0F172A;
  --accent: #10B981;
  --accent-glow: rgba(16, 185, 129, 0.4);
  --surface: #FFFFFF;
  --border: rgba(15, 23, 42, 0.08);
  --glass: rgba(255, 255, 255, 0.85);
  
  --font-serif: 'Outfit', system-ui, sans-serif;
  --font-sans: 'Inter', system-ui, sans-serif;
  
  --ease: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='dark'] {
  /* Dark Mode Tokens */
  --bg: #020710;
  --text: #F1F5F9;
  --text-muted: #94A3B8;
  --primary: #1E3A6E;
  --accent: #10B981;
  --accent-glow: rgba(16, 185, 129, 0.6);
  --surface: rgba(15, 23, 42, 0.6);
  --border: rgba(255, 255, 255, 0.05);
  --glass: rgba(11, 31, 58, 0.7);
}

/* Base Styles */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  transition: var(--ease);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--text);
  margin: 0 0 1rem;
  line-height: 1.2;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 700; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--ease);
}
a:hover { color: var(--accent-light); }

/* Layout Components */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2rem;
  transition: var(--ease);
}
.card:hover {
  transform: translateY(-8px);
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--accent-pale);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 1.8rem;
  border-radius: 8px;
  font-weight: 700;
  transition: var(--ease);
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

/* Theme Specific Tweak */
[data-theme='dark'] .btn-primary {
  background: var(--accent);
  color: #fff;
}

/* Responsive Videos */
.youtube-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  margin: 3rem 0;
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
  border: 1px solid var(--border);
}

.youtube-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.youtube-placeholder {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--ease);
}

.youtube-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  transition: var(--ease);
}

.youtube-placeholder:hover::before {
  background: rgba(15, 23, 42, 0.2);
}

.play-button {
  position: relative;
  z-index: 10;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.play-button svg {
  width: 32px;
  height: 32px;
  color: var(--primary);
  margin-left: 4px; /* Optical center */
}

.youtube-placeholder:hover .play-button {
  transform: scale(1.15);
  background: var(--accent);
}

.youtube-placeholder:hover .play-button svg {
  color: #fff;
}