/* Vishwa Note - Material 3 Inspired Styles */

:root {
  --primary: #6750A4;
  --primary-container: #EADDFF;
  --on-primary: #FFFFFF;
  --on-primary-container: #21005D;
  --secondary: #625B71;
  --secondary-container: #E8DEF8;
  --surface: #FFFBFE;
  --surface-container: #F3EDF7;
  --surface-container-high: #ECE6F0;
  --on-surface: #1C1B1F;
  --on-surface-variant: #49454F;
  --outline: #79747E;
  --outline-variant: #CAC4D0;
  --green: #386A20;
  --green-container: #B6F397;
  --blue: #1A6580;
  --blue-container: #B8EAFF;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-lg: rgba(0, 0, 0, 0.12);
  --header-bg: rgba(255, 251, 254, 0.85);
  --gradient-start: #F3EDF7;
  --gradient-end: #EADDFF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
  --font: 'Roboto', system-ui, -apple-system, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary: #D0BCFF;
  --primary-container: #4F378B;
  --on-primary: #381E72;
  --on-primary-container: #EADDFF;
  --secondary: #CCC2DC;
  --secondary-container: #4A4458;
  --surface: #1C1B1F;
  --surface-container: #211F26;
  --surface-container-high: #2B2930;
  --on-surface: #E6E1E5;
  --on-surface-variant: #CAC4D0;
  --outline: #938F99;
  --outline-variant: #49454F;
  --green: #9DD67D;
  --green-container: #2D4F1E;
  --blue: #7DD0F0;
  --blue-container: #004D61;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-lg: rgba(0, 0, 0, 0.5);
  --header-bg: rgba(28, 27, 31, 0.85);
  --gradient-start: #211F26;
  --gradient-end: #4F378B;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.8;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--outline-variant);
  transition: background var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--on-surface);
  font-weight: 700;
  font-size: 1.15rem;
}

.logo:hover {
  opacity: 1;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-xl);
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--secondary-container);
  color: var(--on-surface);
  opacity: 1;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--surface-container);
  color: var(--on-surface);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition);
}

.theme-toggle:hover {
  background: var(--surface-container-high);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-xl);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow var(--transition), background var(--transition);
}

.btn:hover {
  opacity: 1;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-primary:hover {
  box-shadow: 0 4px 16px var(--shadow-lg);
}

.btn-secondary {
  background: var(--secondary-container);
  color: var(--on-surface);
}

.btn-large {
  padding: 16px 32px;
  font-size: 1rem;
}

/* Badge */
.badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius-xl);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.badge-green {
  background: var(--green-container);
  color: var(--green);
}

/* Hero */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--on-surface);
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--on-surface-variant);
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
}

/* Phone Mockup */
.phone-mockup {
  display: flex;
  justify-content: center;
}

.phone-screen {
  width: 280px;
  background: var(--surface);
  border-radius: 24px;
  padding: 20px;
  box-shadow: 0 20px 60px var(--shadow-lg);
  border: 2px solid var(--outline-variant);
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--on-surface);
}

.app-icon-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 50%;
  font-size: 1.2rem;
}

.note-card {
  position: relative;
  background: var(--surface-container);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 10px;
  border-left: 4px solid var(--primary);
}

.note-card.pinned { border-left-color: #E65100; }
.note-card.favorite { border-left-color: #F9A825; }

.note-card h3 {
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.note-card p {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  margin-bottom: 8px;
}

.note-pin, .note-star {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 0.75rem;
}

.note-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius-sm);
  font-size: 0.65rem;
  font-weight: 500;
}

.note-tag.green {
  background: var(--green-container);
  color: var(--green);
}

.note-tag.blue {
  background: var(--blue-container);
  color: var(--blue);
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--on-surface-variant);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

/* Privacy Section */
.privacy-card {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 48px;
}

.privacy-content h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.privacy-content p {
  color: var(--on-surface-variant);
  margin-bottom: 12px;
}

.privacy-content .highlight {
  font-weight: 600;
  color: var(--primary);
  font-size: 1.05rem;
}

.privacy-list {
  list-style: none;
  margin-top: 20px;
}

.privacy-list li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  color: var(--on-surface-variant);
}

.privacy-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

.privacy-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.shield {
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-container);
  color: var(--primary);
  border-radius: 50%;
}

/* Why Section */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.why-item {
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
}

.why-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.why-item p {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

/* Download */
.download-card {
  text-align: center;
  background: linear-gradient(135deg, var(--primary-container), var(--secondary-container));
  border-radius: var(--radius-xl);
  padding: 60px 40px;
}

.download-card h2 {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--on-primary-container);
}

[data-theme="dark"] .download-card h2 {
  color: var(--on-surface);
}

.download-card p {
  color: var(--on-surface-variant);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.download-note {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--on-surface-variant);
}

/* Footer */
.footer {
  background: var(--surface-container);
  padding: 48px 0 0;
  border-top: 1px solid var(--outline-variant);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-brand p {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 300px;
}

.footer-links h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
  margin-bottom: 14px;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--on-surface);
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid var(--outline-variant);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
}

/* Legal Pages */
.legal-page {
  padding: 100px 0 60px;
}

.legal-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--outline-variant);
}

.legal-header h1 {
  font-size: 2.4rem;
  margin-bottom: 8px;
}

.legal-meta {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
}

.legal-content section {
  margin-bottom: 32px;
}

.legal-content h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--on-surface);
}

.legal-content p {
  color: var(--on-surface-variant);
  margin-bottom: 12px;
}

.legal-content ul {
  margin: 12px 0 12px 24px;
  color: var(--on-surface-variant);
}

.legal-content li {
  margin-bottom: 6px;
}

.contact-email a {
  font-size: 1.1rem;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
  }

  .privacy-card {
    grid-template-columns: 1fr;
    padding: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--surface);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--outline-variant);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    display: block;
    width: 100%;
    text-align: center;
    padding: 12px;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .section {
    padding: 60px 0;
  }

  .download-card {
    padding: 40px 24px;
  }
}