/* =============================================
   FILE: css/main.css
   PURPOSE: Complete presentation layer – local wallpaper, local font
   DEPENDENCIES: assets/fonts/fonts.css (imported via HTML), local wallpaper
   BEST PRACTICES: CSS custom properties, mobile-first, accessibility
   ============================================= */

/* ---------- DESIGN TOKENS (CSS custom properties) ---------- */
:root {
  /* Glass morphism */
  --glass-bg: linear-gradient(145deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.08) 100%);
  --glass-border: 1px solid rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 10px 25px rgba(0, 0, 0, 0.2), inset 0 0 0 1px rgba(255, 255, 255, 0.25);
  --glass-blur: blur(20px);
  --glass-hover-bg: rgba(255, 255, 255, 0.3);
  --glass-hover-blur: blur(25px) saturate(200%);
  --glass-active-bg: rgba(255, 255, 255, 0.18);
  --glass-active-blur: blur(15px);
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 2.5rem;
  
  /* Typography - uses local Inter font */
  --font-primary: 'Gilroy';
  --font-weight-medium: 500;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;
  --font-size-base: 1.35rem;
  --font-size-small: 0.75rem;
  --letter-spacing-base: 0.02em;
  
  /* Borders */
  --radius-pill: 40px;
  --radius-round: 40px;
  
  /* Transitions */
  --transition-default: all 0.2s cubic-bezier(0.2, 0, 0, 1);
  
  /* Colors */
  --color-white: #ffffff;
  --color-white-90: rgba(255, 255, 255, 0.9);
  --color-white-85: rgba(255, 255, 255, 0.85);
  --color-white-60: rgba(255, 255, 255, 0.6);
  --color-white-25: rgba(255, 255, 255, 0.25);
  --color-white-20: rgba(255, 255, 255, 0.2);
  --color-white-10: rgba(255, 255, 255, 0.1);
  --color-white-08: rgba(255, 255, 255, 0.08);
  --color-dark-overlay: rgba(0, 0, 0, 0.2);
  --color-darker-overlay: rgba(5, 15, 25, 0.4);
  --color-fallback-bg: #0a1a2f;
  --color-brand: #084242;
}

/* ---------- RESET / GLOBAL ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  font-display: swap;
  height: 100vh;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-fallback-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- WALLPAPER LAYER - LOCAL IMAGE ---------- */
.wallpaper {
  position: relative;
  width: 100%;
  height: 100%;
  background-image: url('../assets/images/wallpaper.png');
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  isolation: isolate;
}

/* Soft gradient overlay for glass readability */
.wallpaper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 40% 50%, var(--color-dark-overlay) 0%, var(--color-darker-overlay) 100%);
  pointer-events: none;
  z-index: 1;
}

/* ---------- BUTTON PANEL ---------- */
.button-panel {
  position: relative;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(var(--space-sm), 4vw, var(--space-lg));
  padding: clamp(var(--space-sm), 3vw, var(--space-lg));
  max-width: min(1200px, 98%);
  margin: 0 auto;
}

/* ---------- GLASS BUTTON (iOS-inspired) ---------- */
.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.2rem 2.4rem;
  min-width: 180px;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-base);
  color: var(--color-brand);
  text-decoration: none;
  border-radius: var(--radius-pill);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur) saturate(180%);
  -webkit-backdrop-filter: var(--glass-blur) saturate(180%);
  box-shadow: var(--glass-shadow);
  border: var(--glass-border);
  transition: var(--transition-default);
  line-height: 1.2;
  word-break: break-word;
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.glass-btn:hover {
  background: var(--glass-hover-bg);
  backdrop-filter: var(--glass-hover-blur);
  -webkit-backdrop-filter: var(--glass-hover-blur);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
  transform: scale(1.02);
}

.glass-btn:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 4px;
}

.glass-btn:active {
  transform: scale(0.98);
  background: var(--glass-active-bg);
  backdrop-filter: var(--glass-active-blur);
  -webkit-backdrop-filter: var(--glass-active-blur);
}

/* Button inner layout */
.glass-btn span {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.btn-caption {
  display: block;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-regular);
  opacity: 0.85;
  margin-top: 4px;
  letter-spacing: 0.5px;
  color: var(--color-white-90);
}

/* ---------- CREDIT / FOOTER ---------- */
.credit {
  position: absolute;
  bottom: 20px;
  right: 30px;
  z-index: 30;
  font-size: var(--font-size-small);
  color: var(--color-white-60);
  backdrop-filter: blur(5px);
  background: var(--color-white-10);
  padding: 6px 14px;
  border-radius: var(--radius-round);
  font-weight: var(--font-weight-regular);
  border: 0.5px solid var(--color-white-20);
}

.credit a {
  color: var(--color-white-85);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.credit a:hover {
  opacity: 0.9;
  text-decoration: underline;
}

/* ---------- RESPONSIVE (mobile-first) ---------- */
@media (max-width: 640px) {
  .button-panel {
    gap: 1.2rem;
    padding: var(--space-sm);
  }
  
  .glass-btn {
    min-width: 160px;
    padding: 1rem 1.8rem;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .glass-btn {
    min-width: 140px;
    padding: 0.875rem 1.5rem;
    font-size: 1.1rem;
  }
  
  .credit {
    bottom: 16px;
    right: 16px;
    padding: 4px 12px;
  }
}

/* ---------- ACCESSIBILITY ---------- */
@media (prefers-reduced-motion: reduce) {
  .glass-btn,
  .glass-btn:hover,
  .glass-btn:active,
  .credit a {
    transition: none;
  }
  
  .glass-btn:hover {
    transform: none;
  }
}

/* ---------- NOSCRIPT FALLBACK STYLES ---------- */
.fallback-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  justify-content: center;
}

/* ---------- PRINT STYLES ---------- */
@media print {
  .wallpaper::before {
    background: none;
  }
  
  .glass-btn {
    border: 1px solid #ccc;
    background: #f5f5f5;
    color: black;
    box-shadow: none;
    backdrop-filter: none;
  }
  
  .credit {
    position: static;
    background: none;
    color: black;
  }
}