/* ========================================
   TTH Apps — Global Stylesheet
   Pure CSS, zero dependencies
   ======================================== */

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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-border: #d2d2d7;
  --color-card-bg: #fbfbfd;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  --max-width: 720px;
  --max-width-wide: 960px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  --radius: 12px;
  --radius-sm: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #000000;
    --color-bg-alt: #1c1c1e;
    --color-text: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-accent: #2997ff;
    --color-accent-hover: #40a9ff;
    --color-border: #38383a;
    --color-card-bg: #1c1c1e;
  }
}

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

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

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

a:hover {
  text-decoration: underline;
}

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

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* --- Header / Nav --- */
.site-header {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: rgba(255, 255, 255, 0.8);
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(0, 0, 0, 0.8);
  }
}

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

.site-logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-logo:hover {
  text-decoration: none;
}

.site-nav a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-left: var(--spacing-sm);
}

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

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

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto var(--spacing-md);
  line-height: 1.5;
}

.hero .subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

/* --- Sections --- */
.section {
  padding: var(--spacing-xl) 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.section h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.section p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* --- Steps / Feature Grid --- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.step {
  text-align: center;
  padding: var(--spacing-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.step h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.step p {
  font-size: 0.9375rem;
}

/* --- Problem bullets --- */
.problem-list {
  list-style: none;
  max-width: 480px;
  margin: 0 auto;
}

.problem-list li {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.problem-list li:last-child {
  border-bottom: none;
}

/* --- Feature list --- */
.feature-list {
  list-style: none;
  max-width: 540px;
  margin: var(--spacing-md) auto 0;
}

.feature-list li {
  padding: var(--spacing-xs) 0;
  padding-left: 1.5em;
  position: relative;
  color: var(--color-text-secondary);
}

.feature-list li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* --- Pricing --- */
.pricing {
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.pricing .price {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.pricing .price-detail {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* --- Cards --- */
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

/* --- App Card (for studio homepage) --- */
.app-card {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  max-width: 400px;
  margin: var(--spacing-md) auto;
  transition: border-color 0.2s;
}

.app-card:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

.app-card .app-icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  margin-bottom: var(--spacing-sm);
  background: var(--color-bg-alt);
}

.app-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.app-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.app-card .badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.08);
  padding: 0.25em 0.75em;
  border-radius: 999px;
  margin-top: var(--spacing-sm);
}

/* --- Legal pages --- */
.legal {
  padding: var(--spacing-lg) 0 var(--spacing-xl);
}

.legal h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.legal .effective-date {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
}

.legal h2 {
  font-size: 1.25rem;
  font-weight: 600;
  text-align: left;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.legal p, .legal li {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

.legal ul, .legal ol {
  padding-left: 1.5em;
  margin-bottom: var(--spacing-sm);
}

.legal li {
  margin-bottom: var(--spacing-xs);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.site-footer a {
  color: var(--color-text-secondary);
  margin: 0 var(--spacing-xs);
}

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

.footer-links {
  margin-bottom: var(--spacing-xs);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1.0625rem;
  }

  .section h2 {
    font-size: 1.5rem;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .pricing .price {
    font-size: 1.5rem;
  }
}