/* ========================================
   PageHand Landing Page Styles
   Matches extension design system
   ======================================== */

/* --- Theme Variables --- */
:root {
  color-scheme: light;
  --bg: #f5f4ef;
  --bg-soft: #faf9f5;
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(112, 102, 85, 0.14);
  --line-strong: rgba(112, 102, 85, 0.22);
  --text: #171412;
  --muted: #756c61;
  --muted-soft: #978d82;
  --accent: #171412;
  --accent-contrast: #fcfbf8;
  --logo-mark-color: #171412;
  --success: #1f6b47;
  --danger: #b14a32;
  --shadow-soft: 0 10px 28px rgba(23, 20, 18, 0.06);
  --shadow-panel: 0 20px 48px rgba(23, 20, 18, 0.1);
  --composer-border: rgba(112, 102, 85, 0.12);
  --inline-code-bg: rgba(23, 20, 18, 0.07);
  --code-block-bg: rgba(23, 20, 18, 0.06);
  --hero-gradient: radial-gradient(circle at top center, rgba(255, 255, 255, 0.9), transparent 34%),
                   radial-gradient(circle at top left, rgba(221, 216, 205, 0.35), transparent 28%),
                   linear-gradient(180deg, #f8f7f3 0%, #f3f1eb 50%, #f1eee7 100%);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111315;
  --bg-soft: #17191c;
  --surface: rgba(28, 31, 35, 0.76);
  --surface-strong: rgba(30, 33, 37, 0.94);
  --line: rgba(229, 223, 211, 0.12);
  --line-strong: rgba(229, 223, 211, 0.22);
  --text: #f1ede5;
  --muted: #b0a79b;
  --muted-soft: #8d857b;
  --accent: #f1ede5;
  --accent-contrast: #111315;
  --logo-mark-color: #111315;
  --success: #7fd6a5;
  --danger: #f2a188;
  --shadow-soft: 0 12px 34px rgba(0, 0, 0, 0.28);
  --shadow-panel: 0 22px 52px rgba(0, 0, 0, 0.34);
  --composer-border: rgba(229, 223, 211, 0.08);
  --inline-code-bg: rgba(255, 255, 255, 0.08);
  --code-block-bg: rgba(7, 9, 11, 0.66);
  --hero-gradient: radial-gradient(circle at top center, rgba(72, 77, 87, 0.36), transparent 34%),
                   radial-gradient(circle at top left, rgba(90, 74, 63, 0.16), transparent 24%),
                   linear-gradient(180deg, #16181b 0%, #111315 48%, #0d0f11 100%);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; display: block; }
code { font-family: "SFMono-Regular", "JetBrains Mono", monospace; }

/* --- Layout --- */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-soft);
  margin: 0 0 8px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 0 40px;
  line-height: 1.6;
}

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(245, 244, 239, 0.78);
  border-bottom: 1px solid var(--line);
}

:root[data-theme="dark"] .nav {
  background: rgba(17, 19, 21, 0.82);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.nav-brand svg {
  width: 20px;
  height: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 13px;
  color: var(--muted);
  transition: background 140ms ease, color 140ms ease;
}

.nav-link:hover {
  background: var(--surface-strong);
  color: var(--text);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 140ms ease, color 140ms ease;
}

.theme-toggle:hover {
  background: var(--surface-strong);
  color: var(--text);
}

.lang-toggle {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  font-weight: 500;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.lang-toggle:hover {
  background: var(--surface-strong);
  color: var(--text);
  border-color: var(--line-strong);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

/* --- Hero --- */
.hero {
  padding: 80px 0 60px;
  background: var(--hero-gradient);
  text-align: center;
}

.hero-orb {
  width: 72px;
  height: 72px;
  border-radius: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, rgba(255,255,255,0.95), transparent 68%),
              linear-gradient(180deg, rgba(255,255,255,0.82), rgba(244,240,232,0.72));
  border: 1px solid var(--line);
  box-shadow: 0 22px 52px rgba(23,20,18,0.08);
  margin-bottom: 24px;
}

.hero-orb svg { width: 28px; height: 28px; }

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 16px;
}

.hero-tagline {
  font-size: 20px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.5;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-contrast);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 12px 26px rgba(23,20,18,0.18);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(23,20,18,0.24);
}

.hero-sub-cta {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted-soft);
}

.hero-sub-cta a {
  color: var(--text);
}

.hero-screenshot {
  margin-top: 48px;
  border-radius: 20px;
  box-shadow: var(--shadow-panel);
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
}

/* --- Badge Bar --- */
.badge-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  padding: 24px 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 13px;
  color: var(--muted);
}

/* --- Grids --- */
.grid-2, .grid-3 {
  display: grid;
  gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* --- Cards --- */
.card {
  padding: 28px;
  border-radius: 20px;
  border: 1px solid var(--composer-border);
  background: var(--surface-strong);
  box-shadow: var(--shadow-soft);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

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

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--inline-code-bg);
  margin-bottom: 14px;
}

.card-icon svg { width: 20px; height: 20px; }

.card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  line-height: 1.3;
}

.card p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

/* --- Steps --- */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step;
}

.step {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  position: relative;
}

.step + .step {
  border-top: 1px solid var(--line);
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-contrast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
}

.step-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 6px;
}

.step-body p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

/* --- Flow --- */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.flow-node {
  text-align: center;
  padding: 20px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 13px;
  font-weight: 500;
}

.flow-node .flow-icon {
  display: block;
  margin: 0 auto 10px;
  width: 28px;
  height: 28px;
  color: var(--muted);
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-soft);
  font-size: 18px;
  padding: 4px 0;
}

/* --- Principles --- */
.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.principle-card {
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--surface);
  text-align: center;
}

.principle-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 8px;
}

.principle-card p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

/* --- Installation --- */
.install-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.install-step {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  align-items: flex-start;
}

.install-step + .install-step {
  border-top: 1px solid var(--line);
}

.install-step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-contrast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}

.install-step-body h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 4px;
}

.install-step-body p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

.install-step-body code {
  font-size: 13px;
  padding: 2px 8px;
  border-radius: 8px;
  background: var(--inline-code-bg);
}

.install-screenshot {
  margin-top: 24px;
  border-radius: 16px;
  border: 1px solid var(--line);
  overflow: hidden;
}

/* --- Code Blocks --- */
pre {
  margin: 0;
  padding: 20px;
  border-radius: 16px;
  background: var(--code-block-bg);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
}

pre code {
  background: transparent;
  padding: 0;
}

.inline-code {
  font-size: 0.9em;
  padding: 2px 8px;
  border-radius: 8px;
  background: var(--inline-code-bg);
}

/* --- Highlights List --- */
.highlight-list {
  display: grid;
  gap: 12px;
}

.highlight-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.highlight-item .check {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  color: var(--success);
}

.highlight-item h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 4px;
}

.highlight-item p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

/* --- Capabilities --- */
.capability-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.cap-card {
  padding: 24px;
  border-radius: 20px;
  border: 1px solid var(--composer-border);
  background: var(--surface-strong);
  box-shadow: var(--shadow-soft);
}

.cap-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
}

.cap-card p {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 12px;
  line-height: 1.55;
}

.cap-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.cap-card li {
  font-size: 13px;
  color: var(--muted);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.cap-card li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--muted-soft);
}

/* --- Warning / Info Boxes --- */
.box {
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
  margin-bottom: 16px;
}

.box-warning {
  border-color: rgba(177, 74, 50, 0.18);
  background: rgba(177, 74, 50, 0.06);
  color: var(--danger);
}

.box-info {
  border-color: var(--line);
  background: var(--surface);
}

.box h4 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
}

.box p {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
}

.box-warning p { color: var(--danger); }
.box-info p { color: var(--muted); }

/* --- Permissions Table --- */
.permissions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.permission-item {
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.permission-item code {
  font-size: 13px;
  font-weight: 600;
}

.permission-item p {
  font-size: 13px;
  color: var(--muted);
  margin: 6px 0 0;
}

/* --- Footer --- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--line);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.footer-links a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--muted-soft);
}

.footer-copy a {
  color: var(--muted);
}

/* --- Utility --- */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-24 { margin-top: 24px; }
.gap-24 { gap: 24px; }

/* --- Dark mode overrides for nav --- */
:root[data-theme="dark"] .nav {
  background: rgba(17, 19, 21, 0.82);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero h1 { font-size: 34px; }
  .hero-tagline { font-size: 17px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 26px; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }

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

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

  .container { padding: 0 16px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero-tagline { font-size: 15px; }
  .hero { padding: 48px 0 36px; }

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

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