/* ============================================
   NikitCall — Design System & Landing Page
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #22223a;
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-border: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f0f5;
  --text-secondary: #8888a0;
  --text-muted: #55556a;

  --accent-primary: #6C5CE7;
  --accent-secondary: #a855f7;
  --accent-gradient: linear-gradient(135deg, #6C5CE7, #a855f7);
  --accent-glow: rgba(108, 92, 231, 0.3);

  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--accent-glow);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Landing Page --- */
.landing {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* Animated background */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  z-index: 0;
  animation: float 12s ease-in-out infinite;
}

.bg-glow--1 {
  width: 500px;
  height: 500px;
  background: var(--accent-primary);
  top: -150px;
  right: -100px;
  animation-delay: 0s;
}

.bg-glow--2 {
  width: 400px;
  height: 400px;
  background: var(--accent-secondary);
  bottom: -100px;
  left: -100px;
  animation-delay: -4s;
}

.bg-glow--3 {
  width: 300px;
  height: 300px;
  background: #3b82f6;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.15;
  animation-delay: -8s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

/* --- Header --- */
.header {
  width: 100%;
  padding: 24px 32px;
  position: relative;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo__icon {
  display: flex;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.logo__text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Hero --- */
.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px 60px;
  position: relative;
  z-index: 10;
  max-width: 680px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: fadeInUp 0.6s ease-out;
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.hero__title--accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 40px;
  animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

/* --- Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  border-radius: var(--radius-full);
  font-family: var(--font);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow), var(--shadow-md);
  animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.btn--primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 60px var(--accent-glow), var(--shadow-lg);
}

.btn--primary:active {
  transform: translateY(0) scale(0.98);
}

/* --- Features --- */
.features {
  display: flex;
  gap: 16px;
  margin-top: 56px;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

.feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition);
}

.feature:hover {
  background: var(--bg-card);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.feature__icon {
  font-size: 1.5rem;
}

.feature__text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.feature__text strong {
  font-size: 0.9rem;
  font-weight: 600;
}

.feature__text span {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

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

/* --- Mobile Responsive --- */
@media (max-width: 640px) {
  .header {
    padding: 16px 20px;
  }

  .hero {
    padding: 0 20px 40px;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .btn--primary {
    padding: 14px 28px;
    font-size: 1rem;
    width: 100%;
    justify-content: center;
  }

  .features {
    flex-direction: column;
    width: 100%;
    margin-top: 40px;
  }
}

/* Safe area for iPhone */
@supports (padding: env(safe-area-inset-bottom)) {
  .landing {
    padding-bottom: env(safe-area-inset-bottom);
  }
}