/* ========================================
   CSS Variables & Root Styles
   ======================================== */
:root {
  --primary: #000;
  --bg: #fff;
  --surface: #fff;
  --surface-alt: #f9fafb;
  --text: #111827;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --rating-color: #f59e0b;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --btn-bg: #ffffff;
  --btn-text: #000000;
  --header-height: 74px;
}

[data-theme="dark"] {
  --primary: #fff;
  --bg: #0a0a0a;
  --surface: #171717;
  --surface-alt: #262626;
  --text: #f9fafb;
  --text-secondary: #9ca3af;
  --border: #404040;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8);
  --rating-color: #fbbf24;
  --btn-bg: #000000;
  --btn-text: #ffffff;
}

/* ========================================
   Base & Reset
   ======================================== */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  transition: background-color 0.3s ease;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  max-width: 100vw;
  position: relative;
  padding-top: var(--header-height);
}

body,
.site-wrapper,
.site-header,
.site-footer {
  transition: background-color 0.3s ease, color 0.3s ease,
    border-color 0.3s ease;
}

.site-wrapper {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  position: relative;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 24px);
  width: 100%;
  box-sizing: border-box;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 15px;
  line-height: 1.2;
  white-space: nowrap;
}

.btn-primary {
  background: var(--btn-bg);
  color: var(--btn-text);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  opacity: 0.9;
}

[data-theme="dark"] .btn-primary:hover {
  background: #f5f5f5;
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #333;
}

[data-theme="light"] .btn-primary,
:not([data-theme]) .btn-primary {
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  backdrop-filter: blur(4px);
  box-shadow: 0 4px 0 #333;
  transform: translateY(0);
  border: none;
}

[data-theme="light"] .btn-primary:hover,
:not([data-theme]) .btn-primary:hover {
  background: #000;
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #333;
}

[data-theme="light"] .btn-primary:active,
:not([data-theme]) .btn-primary:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #333;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-alt);
  border-color: var(--text);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 17px;
}

.btn-block {
  width: 100%;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .container {
    padding: 0 clamp(20px, 3vw, 24px);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 clamp(16px, 4vw, 20px);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 clamp(12px, 3vw, 16px);
  }
}