/* ============================================
   iCali Web - Shared Stylesheet
   Modern, responsive, mobile-first design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Brand colors */
  --color-primary: #4A90D9;
  --color-primary-dark: #3A78C2;
  --color-primary-light: #6BA8E8;
  --color-accent: #5AC8FA;

  /* Neutral palette */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: #E5E7EB;

  /* 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;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;

  /* Layout */
  --max-width: 1080px;
  --max-width-narrow: 720px;
  --header-height: 64px;

  /* Misc */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --transition: 200ms ease;
}

/* --- Dark mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0F1117;
    --color-bg-alt: #1A1C25;
    --color-surface: #1E2028;
    --color-text: #E5E7EB;
    --color-text-secondary: #9CA3AF;
    --color-text-muted: #6B7280;
    --color-border: #2D3040;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  }
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.85);
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(15, 17, 23, 0.85);
  }
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-text);
  text-decoration: none;
}

.site-logo svg,
.site-logo img {
  width: 32px;
  height: 32px;
}

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

.site-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}

.site-nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* --- Main content --- */
main {
  flex: 1;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: auto;
}

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

.footer-links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

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

.footer-copy {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

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

.hero-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: 999px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-xl);
}

.hero h1 {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.hero .tagline {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.6;
}

/* --- Features grid --- */
.features {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: box-shadow var(--transition), transform var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-sm);
}

.feature-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- CTA button --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #FFFFFF;
}

/* --- Legal / Content Pages --- */
.page-content {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.page-content h1 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.page-content .page-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}

.page-content h2 {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.page-content h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.page-content p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.page-content ul,
.page-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
}

.page-content li {
  margin-bottom: var(--space-xs);
  line-height: 1.6;
}

.page-content a {
  color: var(--color-primary);
}

/* Termly content wrapper - override to fit site style */
.termly-content {
  max-width: 100%;
  overflow-x: auto;
}

/* --- Draft notice --- */
.draft-notice {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid #F59E0B;
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-2xl);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.draft-notice strong {
  color: #F59E0B;
}

/* --- Placeholder page (app) --- */
.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-2xl);
}

.placeholder h1 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.placeholder p {
  color: var(--color-text-secondary);
  max-width: 480px;
  line-height: 1.6;
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-center { text-align: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-md { margin-bottom: var(--space-md); }

/* --- Responsive --- */
@media (max-width: 639px) {
  .hero h1 {
    font-size: var(--text-3xl);
  }

  .hero .tagline {
    font-size: var(--text-base);
  }

  .site-nav {
    gap: var(--space-md);
  }
}