/* ============================================
   SPACEBAR CLICKER — Global Design System
   ============================================ */

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

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors — Dark Theme (default) */
  --bg-primary: #060918;
  --bg-secondary: #0d1129;
  --bg-card: rgba(15, 20, 50, 0.6);
  --bg-card-hover: rgba(20, 28, 65, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-border: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f2ff;
  --text-secondary: #8b92b3;
  --text-muted: #5a6183;

  --accent-primary: #6366f1;
  --accent-primary-glow: rgba(99, 102, 241, 0.3);
  --accent-secondary: #818cf8;
  --accent-green: #10b981;
  --accent-green-glow: rgba(16, 185, 129, 0.3);
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --accent-cyan: #06b6d4;

  --gradient-hero: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.05));
  --gradient-button: linear-gradient(135deg, #6366f1, #8b5cf6);
  --gradient-button-hover: linear-gradient(135deg, #818cf8, #a78bfa);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--accent-primary-glow);
  --shadow-glow-green: 0 0 30px var(--accent-green-glow);

  /* Borders */
  --border-subtle: 1px solid rgba(255, 255, 255, 0.06);
  --border-card: 1px solid rgba(255, 255, 255, 0.08);
  --border-accent: 1px solid rgba(99, 102, 241, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* 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);

  /* Z-index */
  --z-bg: -1;
  --z-base: 1;
  --z-card: 10;
  --z-header: 100;
  --z-modal: 1000;
  --z-toast: 2000;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #eef0f6;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.6);
  --bg-glass-border: rgba(0, 0, 0, 0.08);

  --text-primary: #1a1d2e;
  --text-secondary: #5a6183;
  --text-muted: #8b92b3;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);

  --border-subtle: 1px solid rgba(0, 0, 0, 0.04);
  --border-card: 1px solid rgba(0, 0, 0, 0.08);
  --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(6, 182, 212, 0.03));
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

ul,
ol {
  list-style: none;
}

/* ---------- Background Particles ---------- */
.bg-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-bg);
  pointer-events: none;
  overflow: hidden;
}

.bg-particles .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  animation: float 20s ease-in-out infinite;
}

.bg-particles .orb:nth-child(1) {
  width: 600px;
  height: 600px;
  background: var(--accent-primary);
  top: -10%;
  right: -10%;
  animation-delay: 0s;
}

.bg-particles .orb:nth-child(2) {
  width: 400px;
  height: 400px;
  background: var(--accent-cyan);
  bottom: -5%;
  left: -5%;
  animation-delay: -7s;
}

.bg-particles .orb:nth-child(3) {
  width: 300px;
  height: 300px;
  background: #8b5cf6;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}

@keyframes float {

  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(15px, 35px) scale(1.02);
  }
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: 800px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(6, 9, 24, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: var(--border-subtle);
  padding: var(--space-md) 0;
}

[data-theme="light"] .site-header {
  background: rgba(248, 249, 252, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-links a {
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

.theme-toggle:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.sound-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

.sound-toggle:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.sound-toggle.muted {
  opacity: 0.5;
}

/* Mobile nav toggle */
.mobile-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 1.4rem;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-4xl);
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: var(--border-subtle);
  background: var(--bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--space-md);
  max-width: 300px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.footer-col ul li {
  margin-bottom: var(--space-sm);
}

.footer-col ul li a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.825rem;
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-bottom-links a {
  color: var(--text-muted);
}

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

/* ---------- Section Styles ---------- */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-sm);
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Cards ---------- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.15);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--gradient-button);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  background: var(--gradient-button-hover);
  box-shadow: 0 0 40px var(--accent-primary-glow);
  transform: translateY(-2px);
}

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

.btn--secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.2);
}

.btn--sm {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

/* ---------- Timer Mode Cards ---------- */
.timer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.timer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  text-decoration: none;
  color: var(--text-primary);
}

.timer-card .timer-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  transition: all var(--transition-base);
}

.timer-card:hover .timer-icon {
  background: var(--gradient-button);
  box-shadow: var(--shadow-glow);
  transform: scale(1.1);
}

.timer-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.timer-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ---------- Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  padding: var(--space-xl);
}

.feature-card .feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: var(--space-md);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  border: var(--border-card);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(99, 102, 241, 0.15);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  width: 100%;
  text-align: left;
}

.faq-question .faq-toggle {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: var(--space-md);
}

.faq-item.open .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer-inner {
  padding: 0 var(--space-xl) var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

/* ---------- How To Steps ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
  counter-reset: step;
}

.step-card {
  position: relative;
  padding: var(--space-xl);
  padding-top: var(--space-2xl);
  counter-increment: step;
}

.step-card::before {
  content: counter(step);
  position: absolute;
  top: var(--space-lg);
  left: var(--space-xl);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--gradient-button);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  line-height: 32px;
  text-align: center;
}

.step-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: var(--space-md) 0 var(--space-sm);
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- SEO Content Section ---------- */
.seo-content {
  max-width: 800px;
  margin: 0 auto;
}

.seo-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  margin-top: var(--space-2xl);
  color: var(--text-primary);
}

.seo-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-xl);
  color: var(--text-primary);
}

.seo-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.seo-content ul {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.seo-content ul li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--space-sm);
  list-style: disc;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: var(--border-subtle);
    flex-direction: column;
    padding: var(--space-md);
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

  .container {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .timer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}