/* ============================================
   ShotSense AI - Design System & Shared Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2128;
  --bg-card-hover: #22272e;
  --border-color: #30363d;
  --border-subtle: #21262d;

  --accent-orange: #FF6B35;
  --accent-orange-hover: #ff8255;
  --accent-orange-glow: rgba(255, 107, 53, 0.25);
  --accent-blue: #58A6FF;
  --accent-green: #3FB950;
  --accent-red: #F85149;
  --accent-yellow: #D29922;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-glow-orange: 0 0 20px rgba(255, 107, 53, 0.15);
  --shadow-glow-blue: 0 0 20px rgba(88, 166, 255, 0.15);

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  --container-max: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
  line-height: 1.3;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-orange);
}

img, svg {
  max-width: 100%;
  display: block;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--text-primary);
}

.navbar-brand .brand-icon {
  color: var(--accent-orange);
  font-size: 1.5rem;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.navbar-links a {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.navbar-links a:hover {
  color: var(--text-primary);
}

.navbar-links a.active {
  color: var(--accent-orange);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.language-switch button {
  padding: 2px;
  border: 0;
  background: transparent;
  color: var(--text-tertiary);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.language-switch button:hover,
.language-switch button.active {
  color: var(--accent-orange);
}

/* --- Main Content --- */
main {
  flex: 1;
  margin-top: var(--nav-height);
  padding: 48px 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  line-height: 1.4;
}

.btn-primary {
  background: var(--accent-orange);
  color: #fff;
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
  background: var(--accent-orange-hover);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary.disabled,
.btn-primary:disabled {
  background: var(--bg-card-hover);
  color: var(--text-tertiary);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--text-tertiary);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn-full {
  width: 100%;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.card-hover:hover {
  border-color: var(--accent-orange);
  box-shadow: var(--shadow-glow-orange);
  transform: translateY(-4px);
}

/* --- Badge / Tag --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-orange {
  background: rgba(255, 107, 53, 0.15);
  color: var(--accent-orange);
}

.badge-green {
  background: rgba(63, 185, 80, 0.15);
  color: var(--accent-green);
}

/* --- Section Headings --- */
.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-orange);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* --- Footer --- */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.footer p {
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.footer a {
  color: var(--text-secondary);
}

.footer a:hover {
  color: var(--accent-orange);
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-orange { color: var(--accent-orange); }
.text-green { color: var(--accent-green); }
.text-muted { color: var(--text-secondary); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

/* --- Fade-in Animation --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up.delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-up.delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-up.delay-3 { animation-delay: 0.3s; opacity: 0; }
.fade-in-up.delay-4 { animation-delay: 0.4s; opacity: 0; }
.fade-in-up.delay-5 { animation-delay: 0.5s; opacity: 0; }