frontend/styles.css

/* ============================================================
   RandomWeb — Premium Dark Theme
   Design system: Midnight navy base, cyan↔violet gradients,
   glassmorphism panels, Inter + Outfit fonts, micro-animations
   ============================================================ */

/* ─── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── CSS Custom Properties ────────────────────────────────── */
:root {
  /* Core palette */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);

  /* Accent gradients */
  --gradient-primary: linear-gradient(135deg, #06b6d4, #8b5cf6);
  --gradient-secondary: linear-gradient(135deg, #8b5cf6, #ec4899);
  --gradient-glow: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
  --gradient-hero: linear-gradient(180deg, #0a0e1a 0%, #111827 50%, #0a0e1a 100%);

  /* Text */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #06b6d4;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(6, 182, 212, 0.3);

  /* Shadows */
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 40px rgba(6, 182, 212, 0.15);
  --shadow-glow-violet: 0 0 40px rgba(139, 92, 246, 0.15);
  --shadow-button: 0 0 30px rgba(6, 182, 212, 0.3), 0 0 60px rgba(139, 92, 246, 0.1);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ─── Animated Background ──────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.bg-grid::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* Floating orbs */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: rgba(6, 182, 212, 0.12);
  top: -100px;
  left: -100px;
  animation-delay: 0s;
}

.orb-2 {
  width: 350px;
  height: 350px;
  background: rgba(139, 92, 246, 0.12);
  bottom: -100px;
  right: -100px;
  animation-delay: -7s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: rgba(236, 72, 153, 0.08);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -40px) scale(1.05); }
  50% { transform: translate(-20px, 20px) scale(0.95); }
  75% { transform: translate(40px, 30px) scale(1.02); }
}

/* ─── Layout ───────────────────────────────────────────────── */
.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ─── Header ───────────────────────────────────────────────── */
.header {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 26, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-glow-cyan);
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-stats {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.header-stats .pulse-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
}

/* ─── Hero Section ─────────────────────────────────────────── */
.hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  backdrop-filter: blur(10px);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.03em;
}

.hero h1 .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

/* ─── Random Button ────────────────────────────────────────── */
.random-btn-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-3xl);
}

.random-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: 1.15rem 2.5rem;
  background: var(--gradient-primary);
  color: white;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-button);
  text-decoration: none;
  letter-spacing: 0.01em;
  overflow: hidden;
}

.random-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.random-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 0 50px rgba(6, 182, 212, 0.4), 0 0 80px rgba(139, 92, 246, 0.2);
}

.random-btn:hover::before {
  opacity: 1;
}

.random-btn:active {
  transform: translateY(-1px) scale(0.98);
}

.random-btn .btn-icon {
  font-size: 1.4rem;
  animation: spinSlow 8s linear infinite;
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.random-btn:hover .btn-icon {
  animation-duration: 1s;
}

.random-btn.loading .btn-icon {
  animation: spinSlow 0.6s linear infinite;
}

/* ─── Glass Card ───────────────────────────────────────────── */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-glass-hover);
}

/* ─── Search Section ───────────────────────────────────────── */
.search-section {
  margin-bottom: var(--space-2xl);
}

.search-section h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 1rem 1rem 1rem 3rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition: all var(--transition-base);
}

.search-box input:focus {
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
  background: var(--bg-glass-hover);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box .search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-results {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 400px;
  overflow-y: auto;
}

.search-results::-webkit-scrollbar {
  width: 6px;
}

.search-results::-webkit-scrollbar-track {
  background: transparent;
}

.search-results::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 3px;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  color: var(--text-primary);
}

.search-result-item:hover {
  border-color: var(--border-accent);
  background: var(--bg-glass-hover);
  transform: translateX(4px);
}

.search-result-item .result-url {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-accent);
  word-break: break-all;
}

.search-result-item .result-domain {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.search-result-item .result-arrow {
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  flex-shrink: 0;
  margin-left: var(--space-md);
}

.search-result-item:hover .result-arrow {
  color: var(--text-accent);
  transform: translateX(4px);
}

.search-empty {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ─── Submit Section ───────────────────────────────────────── */
.submit-section {
  margin-bottom: var(--space-3xl);
}

.submit-section h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.submit-section .subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

.submit-form {
  display: flex;
  gap: var(--space-sm);
}

.submit-form input {
  flex: 1;
  padding: 0.85rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-base);
}

.submit-form input:focus {
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.submit-form input::placeholder {
  color: var(--text-muted);
}

.submit-btn {
  padding: 0.85rem 1.5rem;
  background: var(--gradient-primary);
  color: white;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

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

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.submit-feedback {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  display: none;
  animation: fadeSlideUp 0.3s ease-out;
}

.submit-feedback.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: #86efac;
}

.submit-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Footer ───────────────────────────────────────────────── */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) 0;
  background: rgba(10, 14, 26, 0.9);
  backdrop-filter: blur(20px);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.live-counter {
  text-align: center;
}

.live-counter .counter-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.live-counter .counter-label .live-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
  display: inline-block;
}

.live-counter .counter-value {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  transition: all var(--transition-base);
}

.live-counter .counter-subtext {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  font-size: 0.8rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-links .divider {
  width: 3px;
  height: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  opacity: 0.5;
}

/* ─── Toast Notifications ──────────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  animation: toastIn 0.3s ease-out;
  font-size: 0.9rem;
  max-width: 350px;
  box-shadow: var(--shadow-lg);
}

.toast.toast-exiting {
  animation: toastOut 0.3s ease-in forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100px); }
}

/* ─── Responsive ───────────────────────────────────────────── */
@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }

  .submit-form {
    flex-direction: column;
  }

  .header .container {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ─── Utility Animations ───────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-up {
  animation: slideUp 0.6s ease-out;
}

.slide-up-delay-1 { animation-delay: 0.1s; animation-fill-mode: backwards; }
.slide-up-delay-2 { animation-delay: 0.2s; animation-fill-mode: backwards; }
.slide-up-delay-3 { animation-delay: 0.3s; animation-fill-mode: backwards; }
.slide-up-delay-4 { animation-delay: 0.4s; animation-fill-mode: backwards; }

/* ─── Loading Skeleton ─────────────────────────────────────── */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-glass) 25%,
    rgba(255, 255, 255, 0.06) 50%,
    var(--bg-glass) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 50%; }
  100% { background-position: -200% 50%; }
}