/* ===========================
   Notanem Landing Page
   =========================== */

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

:root {
  /* Colors — from Notanem design tokens */
  --bg: #F9F9F9;
  --surface: #FFFFFF;
  --border: #F0F0F0;
  --text-primary: #1C1C1C;
  --text-secondary: #6E6E6E;
  --text-tertiary: #A8A8A8;
  --accent: #7A95A8;
  --accent-hover: #6B8699;
  --success: #4A9F6E;
  --error: #C75450;

  /* Fonts */
  --font-prose: "Source Serif 4", Georgia, serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04);

  /* Spacing — 8px grid */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --space-12: 96px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.6;
}

/* ===========================
   Layout
   =========================== */

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.container--wide {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

section {
  padding: var(--space-10) 0;
}

/* ===========================
   Sticky Header
   =========================== */

.sticky-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(249, 249, 249, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transform: translateY(-100%);
  transition: transform 0.25s ease;
}

.sticky-header.visible {
  transform: translateY(0);
}

.sticky-header-inner {
  position: relative;
  max-width: 740px;
  margin: 0 auto;
  padding: 12px var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sticky-wordmark {
  font-family: var(--font-prose);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.sticky-icon {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.sticky-cta {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

.sticky-cta:hover {
  color: var(--accent-hover);
}

/* ===========================
   Hero
   =========================== */

.hero {
  text-align: center;
  padding: var(--space-12) 0 var(--space-10);
}

.hero-icon {
  display: block;
  margin: 0 auto var(--space-3);
}

.wordmark {
  font-family: var(--font-prose);
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.tagline {
  font-family: var(--font-prose);
  font-size: 1.25rem;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: var(--space-1);
}

.subtitle {
  font-family: var(--font-ui);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-5);
}

/* ===========================
   Download Buttons
   =========================== */

.download-buttons {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px var(--space-3);
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.15s ease, color 0.15s ease;
}

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

.btn--primary:hover {
  background-color: var(--accent-hover);
}

.btn--secondary {
  color: var(--accent);
  background-color: transparent;
  border: 1px solid var(--accent);
}

.btn--secondary:hover {
  background-color: rgba(122, 149, 168, 0.08);
}

.btn--disabled {
  color: var(--text-tertiary);
  background-color: transparent;
  border: 1px solid var(--border);
  cursor: default;
}

.download-alt {
  margin-top: var(--space-2);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.download-alt a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.download-alt a:hover {
  color: var(--text-primary);
}

.tooltip-wrap {
  position: relative;
  display: inline-block;
}

.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--text-tertiary);
  font-family: var(--font-ui);
  font-size: 0.65rem;
  color: var(--text-tertiary);
  cursor: help;
  vertical-align: middle;
  line-height: 1;
}

.tooltip-text {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 220px;
  padding: 8px 10px;
  background: var(--text-primary);
  color: var(--bg);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  line-height: 1.4;
  border-radius: 6px;
  text-align: center;
  transition: opacity 0.15s ease;
  pointer-events: none;
  z-index: 10;
}

.tooltip-text::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--text-primary);
}

.tooltip-wrap:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* ===========================
   Why
   =========================== */

.why {
  text-align: center;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.why h2 {
  font-family: var(--font-prose);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-3);
}

.why p {
  font-family: var(--font-prose);
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.why p:last-child {
  margin-bottom: 0;
}

/* ===========================
   Modes
   =========================== */

.modes {
  text-align: center;
}

.modes h2 {
  font-family: var(--font-prose);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.modes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  text-align: left;
}

.mode-card {
  background: var(--surface);
  border-radius: 8px;
  padding: var(--space-3);
  box-shadow: var(--shadow-card);
}

.mode-card h3 {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.mode-card p {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.mode-card:last-child {
  grid-column: 1 / -1;
}

/* ===========================
   Mobile Companion
   =========================== */

.mobile-companion {
  text-align: center;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mobile-companion h2 {
  font-family: var(--font-prose);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.mobile-companion > .container > p {
  font-family: var(--font-ui);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.mobile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  text-align: left;
}

.mobile-card {
  background: var(--surface);
  border-radius: 8px;
  padding: var(--space-3);
  box-shadow: var(--shadow-card);
}

.mobile-card h3 {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.mobile-card p {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===========================
   Community-Funded
   =========================== */

.community-funded {
  text-align: center;
}

.community-funded h2 {
  font-family: var(--font-prose);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.community-funded p {
  font-family: var(--font-prose);
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.community-funded p:last-of-type {
  margin-bottom: var(--space-4);
}

.support-link {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

.support-link:hover {
  color: var(--accent-hover);
}

/* ===========================
   CTA
   =========================== */

.cta {
  text-align: center;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cta h2 {
  font-family: var(--font-prose);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.cta > .container > p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

/* ===========================
   Footer
   =========================== */

.footer {
  padding: var(--space-6) 0;
  text-align: center;
}

.footer-wordmark {
  font-family: var(--font-prose);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.6;
}

.footer a {
  color: var(--text-tertiary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* ===========================
   Legal Pages
   =========================== */

.legal-header {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
}

.legal-header-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.legal-header .back-link {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.legal-header .back-link:hover {
  color: var(--text-secondary);
}

.legal-header .header-wordmark {
  font-family: var(--font-prose);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
}

.legal-content {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-3) var(--space-10);
}

.legal-content h1 {
  font-family: var(--font-prose);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-1);
}

.legal-content .legal-meta {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-5);
}

.legal-content .legal-meta strong {
  color: var(--text-secondary);
}

.legal-content .legal-intro {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.legal-content h2 {
  font-family: var(--font-prose);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.legal-content h3 {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  margin-top: var(--space-3);
  margin-bottom: var(--space-1);
}

.legal-content p {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.legal-content ul,
.legal-content ol {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2);
  padding-left: var(--space-3);
}

.legal-content li {
  margin-bottom: 4px;
}

.legal-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

.legal-content a:hover {
  color: var(--accent-hover);
}

.legal-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-3);
  font-family: var(--font-ui);
  font-size: 0.875rem;
}

.legal-content th,
.legal-content td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  line-height: 1.5;
}

.legal-content th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--surface);
}

.legal-content blockquote {
  margin: var(--space-2) 0;
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid var(--border);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.7;
}

.legal-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-5) 0;
}

.legal-content .caps-block {
  text-transform: none;
  font-size: 0.875rem;
}

/* Footer legal links */

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1) var(--space-2);
  margin-bottom: var(--space-1);
}

.footer-legal a {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* ===========================
   Outline button (mobile: "Get for Mac")
   =========================== */

.btn--outline {
  color: var(--text-secondary);
  background-color: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
}

.btn--outline:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

/* ===========================
   QR Modal
   =========================== */

.qr-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.qr-modal-overlay[hidden] {
  display: none;
}

.qr-modal {
  position: relative;
  background: var(--surface);
  border-radius: 12px;
  padding: var(--space-5);
  max-width: 320px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.qr-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-tertiary);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

.qr-modal-close:hover {
  color: var(--text-primary);
}

.qr-modal-code svg {
  width: 200px;
  height: 200px;
}

.qr-modal-text {
  margin-top: var(--space-2);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ===========================
   Toast
   =========================== */

.toast {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--text-primary);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  padding: 10px var(--space-3);
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1100;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 600px) {
  .wordmark {
    font-size: 2rem;
  }

  .tagline {
    font-size: 1.125rem;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }

  .modes-grid,
  .mobile-grid {
    grid-template-columns: 1fr;
  }

  .why h2,
  .modes h2,
  .mobile-companion h2,
  .community-funded h2,
  .cta h2 {
    font-size: 1.25rem;
  }

  section {
    padding: var(--space-8) 0;
  }

  .hero {
    padding: var(--space-10) 0 var(--space-8);
  }
}