/* ThinkAlike site — theme colors mirrored from ThemeColors.swift */
:root {
  --accent-blue: #4a6bf7;
  --accent-purple: #9c59b5;
  --accent-cyan: #3bade6;
  --accent-gradient: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue), var(--accent-purple));
  --accent-gradient-soft: linear-gradient(135deg, rgba(59, 173, 230, 0.15), rgba(74, 107, 247, 0.15), rgba(156, 89, 181, 0.15));

  --success: #26a659;
  --warning: #f08a1c;
  --bronze: #b87326;

  /* Light (default when prefers-color-scheme light) */
  --bg-start: #f5f7fa;
  --bg-end: #ebf0f7;
  --text: #1a1a2e;
  --text-muted: #5b5b7a;
  --card-bg: rgba(255, 255, 255, 0.72);
  --card-border: rgba(26, 26, 46, 0.08);
  --card-shadow: 0 24px 48px -24px rgba(74, 107, 247, 0.25);
  --nav-bg: rgba(245, 247, 250, 0.72);
  --border: rgba(26, 26, 46, 0.1);
  --code-bg: rgba(74, 107, 247, 0.08);
  --blockquote-bg: rgba(74, 107, 247, 0.06);
  --close-btn: rgba(26, 26, 46, 0.08);
  --dot-overlay: rgba(74, 107, 247, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-start: #14141f;
    --bg-end: #1c1c29;
    --text: #ebebf5;
    --text-muted: #9a9ab0;
    --card-bg: rgba(255, 255, 255, 0.04);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.6);
    --nav-bg: rgba(20, 20, 31, 0.72);
    --border: rgba(255, 255, 255, 0.1);
    --code-bg: rgba(255, 255, 255, 0.06);
    --blockquote-bg: rgba(255, 255, 255, 0.03);
    --close-btn: rgba(255, 255, 255, 0.1);
    --dot-overlay: rgba(74, 107, 247, 0.04);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot-overlay) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* ----- Navigation ----- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.brand .brand-name {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 1.05rem;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* ----- Hamburger toggle (hidden on desktop) ----- */
.nav-toggle { display: none; }

.nav-toggle-btn {
  display: none;
  width: 40px;
  height: 40px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: 8px;
  flex-shrink: 0;
}

.nav-toggle-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 720px) {
  .nav-toggle-btn { display: inline-flex; }

  .brand .brand-name { display: none; }

  .nav nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.25s ease;
  }

  .nav-toggle:checked ~ nav {
    max-height: 300px;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1.5rem 1rem;
  }

  .nav-links li {
    border-top: 1px solid var(--border);
  }

  .nav-links a {
    display: block;
    padding: 0.85rem 0;
    font-size: 1rem;
  }

  .nav-toggle:checked ~ .nav-toggle-btn span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle:checked ~ .nav-toggle-btn span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle:checked ~ .nav-toggle-btn span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* ----- App Store badge in header ----- */
.app-store-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.app-store-badge {
  width: 160px;
  height: 64px;
  object-fit: contain;
  vertical-align: middle;
}

.app-store-qr {
  width: 64px;
  height: 64px;
  object-fit: contain;
  vertical-align: middle;
}

@media (max-width: 820px) {
  .app-store-badge { width: 130px; height: 52px; }
  .app-store-qr { width: 52px; height: 52px; }
}

@media (max-width: 640px) {
  .app-store-badge { width: 110px; height: 44px; }
  .app-store-qr { display: none; }
}

@media (max-width: 420px) {
  .app-store-badge { width: 96px; height: 38px; }
}

/* ----- Layout containers ----- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: 760px;
}

section {
  padding: 5rem 0;
  position: relative;
  z-index: 1;
}

@media (max-width: 720px) {
  section { padding: 3.5rem 0; }
}

/* ----- Hero ----- */
.hero {
  padding: 5rem 0 4rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 3rem 0 2rem;
  }
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  font-family: Georgia, "Times New Roman", serif;
}

.hero-title .word {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: block;
}

.hero-subtitle {
  font-size: 0.95rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-tag {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 520px;
}

@media (max-width: 960px) {
  .hero-tag { margin-left: auto; margin-right: auto; }
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .hero-ctas { justify-content: center; }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 12px 28px -10px rgba(74, 107, 247, 0.55);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px -10px rgba(74, 107, 247, 0.7);
}

.btn-ghost {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

/* ----- Hero device mockup ----- */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.phone {
  width: min(320px, 80%);
  aspect-ratio: 1206 / 2622;
  border-radius: 42px;
  overflow: hidden;
  border: 10px solid #1a1a1f;
  background: #0a0a10;
  box-shadow:
    0 40px 80px -20px rgba(74, 107, 247, 0.35),
    0 20px 40px -10px rgba(156, 89, 181, 0.25),
    inset 0 0 0 2px rgba(255, 255, 255, 0.04);
  position: relative;
  transform: rotate(-2deg);
}

.phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.phone-stack {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-stack .phone:nth-child(1) {
  transform: rotate(-6deg) translateX(-30%);
  width: min(240px, 60%);
  position: absolute;
  z-index: 1;
  opacity: 0.85;
}

.phone-stack .phone:nth-child(2) {
  transform: rotate(3deg) translateX(12%);
  width: min(270px, 68%);
  position: relative;
  z-index: 2;
}

@media (max-width: 960px) {
  .phone-stack .phone:nth-child(1) { display: none; }
  .phone-stack .phone:nth-child(2) { transform: none; margin: 0 auto; }
}

/* ----- Section headings ----- */
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent-blue);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-head p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ----- Feature grid ----- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.75rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: rgba(74, 107, 247, 0.35);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--accent-blue);
  font-size: 1.4rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ----- Modes section (two columns with image) ----- */
.mode-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0;
}

.mode-row.reverse .mode-visual { order: 2; }
.mode-row.reverse .mode-text { order: 1; }

@media (max-width: 820px) {
  .mode-row {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 0;
  }
  .mode-row.reverse .mode-visual,
  .mode-row.reverse .mode-text { order: unset; }
}

.mode-text h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.mode-text .tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.example-pill {
  display: inline-block;
  background: var(--code-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 0.6rem 1rem;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.95rem;
  margin: 0.3rem 0.3rem 0.3rem 0;
}

.example-pill .accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
}

.mode-visual {
  display: flex;
  justify-content: center;
}

.mode-visual .phone {
  width: min(280px, 85%);
}

/* ----- Screenshot gallery ----- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform 0.2s ease;
}

.gallery-item:hover { transform: translateY(-3px); }

.gallery-item img {
  width: 100%;
  max-width: 240px;
  border-radius: 24px;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.4);
  aspect-ratio: 1206 / 2622;
  object-fit: cover;
}

.gallery-item .label {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ----- Scoring ----- */
.scoring-card {
  max-width: 620px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 2rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--card-shadow);
}

.scoring-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  gap: 1rem;
}

.scoring-row:last-child { border-bottom: none; }

.scoring-points {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-align: center;
}

.scoring-desc { color: var(--text-muted); }
.scoring-desc strong { color: var(--text); font-weight: 600; }

/* ----- Footer ----- */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
}

.footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin-right: 1.25rem;
}

.footer a:hover { color: var(--accent-blue); }

/* ----- Help page specifics ----- */
.help-page {
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.help-page h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  letter-spacing: -0.01em;
}

.help-page h1 .app-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.help-page h1 + p {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

.help-page h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.75rem;
  margin-bottom: 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.005em;
}

.help-page h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.help-page p,
.help-page ol,
.help-page ul {
  margin-bottom: 0.85rem;
}

.help-page ol,
.help-page ul {
  padding-left: 1.5rem;
}

.help-page li {
  margin-bottom: 0.4rem;
}

.help-page li ul {
  margin-top: 0.4rem;
  margin-bottom: 0;
}

.help-page strong { font-weight: 600; }

.help-page code {
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.help-page pre {
  background: var(--code-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.85rem;
  overflow-x: auto;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  line-height: 1.65;
}

.help-page blockquote {
  background: var(--blockquote-bg);
  border-left: 3px solid var(--accent-blue);
  padding: 0.8rem 1.1rem;
  margin-bottom: 0.85rem;
  border-radius: 0 10px 10px 0;
  color: var(--text-muted);
  font-size: 0.95em;
}

.help-page blockquote p { margin-bottom: 0; }

.help-page .scoring-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.85rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
}

.help-page .scoring-table th,
.help-page .scoring-table td {
  text-align: left;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--border);
}

.help-page .scoring-table tr:last-child td { border-bottom: none; }

.help-page .scoring-table th {
  font-weight: 600;
  font-size: 0.82em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--code-bg);
}

.help-page .settings-list {
  list-style: none;
  padding-left: 0;
}

.help-page .settings-list li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
}

.help-page .settings-list li:last-child { border-bottom: none; }

.help-page .toc {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.help-page .toc .toc-label {
  font-weight: 600;
  margin-bottom: 0.6rem;
  font-size: 0.78em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.help-page .toc ul {
  list-style: none;
  padding: 0;
  columns: 2;
  column-gap: 1.25rem;
  margin: 0;
}

.help-page .toc li {
  margin-bottom: 0.3rem;
}

.help-page .toc a {
  color: var(--accent-blue);
  text-decoration: none;
  font-size: 0.95em;
}

.help-page .toc a:hover {
  text-decoration: underline;
}

@media (max-width: 560px) {
  .help-page .toc ul { columns: 1; }
}