@font-face {
  font-family: 'Inter';
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  src: url('../assets/fonts/Inter-Regular.ttf') format('truetype');
}

@font-face {
  font-family: 'Inter';
  font-weight: 500;
  font-style: normal;
  font-display: swap;
  src: url('../assets/fonts/Inter-Medium.ttf') format('truetype');
}

@font-face {
  font-family: 'Inter';
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  src: url('../assets/fonts/Inter-SemiBold.ttf') format('truetype');
}

@font-face {
  font-family: 'Inter';
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  src: url('../assets/fonts/Inter-Bold.ttf') format('truetype');
}

/* ============================================
   Screencore Design System
   Dark gray, copper accents -- matches app's Screencore theme
   ============================================ */

:root {
  /* Backgrounds -- from Screencore theme (cool dark gray) */
  --app-bg: #24262e;
  --page-bg: #2e3039;
  --panel-bg: rgba(28, 30, 38, 0.96);
  --panel-header-bg: rgba(255, 255, 255, 0.05);
  --toolbar-bg: rgba(28, 30, 38, 0.76);

  /* Title page background tones */
  --title-bg: #24262e;
  --title-page-surface: #24262e;
  --title-page-surface-alt: #2e3039;

  /* Borders */
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.14);

  /* Text -- light base for dark background */
  --text-primary: rgba(255, 255, 255, 0.88);
  --text-mid: rgba(255, 255, 255, 0.58);
  --text-muted: rgba(255, 255, 255, 0.46);
  --text-dim: rgba(255, 255, 255, 0.30);
  --text-ghost: rgba(255, 255, 255, 0.14);
  --text-on-accent: #ffffff;

  /* Accent -- copper */
  --accent: #c4906a;
  --accent-hover: #d4a480;
  --danger: #d46a6a;
  --warning: #d98c40;
  --success: #7dba8f;

  /* Cards & inputs */
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-hover-bg: rgba(196, 144, 106, 0.08);
  --card-hover-border: rgba(196, 144, 106, 0.25);
  --row-hover-bg: rgba(255, 255, 255, 0.05);
  --row-active-bg: rgba(196, 144, 106, 0.12);
  --input-bg: rgba(255, 255, 255, 0.05);
  --input-border: rgba(255, 255, 255, 0.10);

  /* Scrollbar */
  --scroll-thumb: rgba(196, 144, 106, 0.15);

  /* Glow gradient (copper accents) */
  --glow-dark: #5c3828;
  --glow-mid: #c4906a;
  --glow-light: #d4a480;
  --glow-warm: #a07050;
  --glow-pale: #e0b48e;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 71px;
}

body {
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--app-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Thin gold accent bar at the very top of the viewport */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--glow-mid) 30%,
    var(--glow-light) 50%,
    var(--glow-mid) 70%,
    transparent 100%
  );
  z-index: 1001;
}

h1, h2, h3, h4, h5, h6 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 3rem; letter-spacing: 0.04em; }
h2 { font-size: 2.2rem; letter-spacing: 0.03em; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.2rem; letter-spacing: 0.02em; }

p {
  color: var(--text-mid);
  margin-bottom: 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

ul, ol {
  list-style: none;
}

code {
  font-family: "SF Mono", "Fira Code", "JetBrains Mono", "Cascadia Code", monospace;
  background: var(--input-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent);
}

::selection {
  background: rgba(196, 144, 106, 0.25);
  color: var(--text-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(196, 144, 106, 0.30);
}

/* ============================================
   Glass Effects (dark theme, frosted glass)
   ============================================ */

.glass {
  background: var(--toolbar-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border);
}

.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--border);
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* ============================================
   Navigation
   ============================================ */

.site-nav {
  position: fixed;
  top: 2px;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(28, 30, 38, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
}

/* Nav brand icon removed -- text only */

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-mid);
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
  position: relative;
}

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

.nav-links a.active {
  color: var(--accent);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--accent);
  border-radius: 1px;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-mid);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

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

.site-footer {
  position: relative;
  overflow: hidden;
  padding: 48px 24px 32px;
  border-top: 1px solid var(--border);
  background: var(--page-bg);
}

.footer-watermark {
  position: absolute;
  bottom: -30px;
  right: -20px;
  width: 220px;
  height: 220px;
  opacity: 0.03;
  pointer-events: none;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  position: relative;
  z-index: 1;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

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

.footer-copy {
  color: var(--text-dim);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

/* ============================================
   Title Page Surface (content "page" effect)
   ============================================ */

.page-surface {
  background: var(--page-bg);
}

.page-surface-alt {
  background: var(--title-page-surface-alt);
}

/* ============================================
   Glow Line Divider (subtle gold line)
   ============================================ */

.glow-line {
  height: 1px;
  border: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--border) 20%,
    rgba(196, 144, 106, 0.25) 50%,
    var(--border) 80%,
    transparent 100%
  );
  margin: 0;
}

/* ============================================
   Glass Card
   ============================================ */

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 28px;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.card:hover {
  background: var(--card-hover-bg);
  border-color: var(--card-hover-border);
  transform: translateY(-2px);
}

.card h3,
.card h4 {
  margin-bottom: 12px;
}

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

.card-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
  display: block;
  color: var(--accent);
}

.card-icon svg,
.feature-point-icon svg,
.peer-icon svg {
  display: inline-block;
  vertical-align: middle;
}

/* ============================================
   Keycap Styling
   ============================================ */

kbd {
  display: inline-block;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.78rem;
  line-height: 1;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-bottom-width: 2px;
  border-bottom-color: rgba(255, 255, 255, 0.16);
  border-radius: 5px;
  color: var(--text-primary);
  white-space: nowrap;
  vertical-align: middle;
}

/* ============================================
   macOS Window Frame (screenshot placeholder)
   ============================================ */

.macos-window {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-hover);
  background: var(--page-bg);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.40), 0 1px 4px rgba(0, 0, 0, 0.20);
}

.macos-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--panel-header-bg);
  border-bottom: 1px solid var(--border);
}

.macos-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.macos-dot.red { background: #ff5f56; }
.macos-dot.yellow { background: #ffbd2e; }
.macos-dot.green { background: #27c93f; }

.macos-content {
  padding: 40px 32px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-style: italic;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

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

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

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

.btn-outline:hover {
  background: rgba(196, 144, 106, 0.10);
  border-color: var(--accent-hover);
  color: var(--accent-hover);
}

/* ============================================
   Fade-in Scroll Animation
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Section Heading
   ============================================ */

.section-heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-heading h2 {
  margin-bottom: 12px;
}

.section-heading p {
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Grid Layouts
   ============================================ */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ============================================
   Table
   ============================================ */

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.02);
}

.data-table td {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.data-table tr:hover td {
  background: var(--row-hover-bg);
}

/* ============================================
   Pill / Tag
   ============================================ */

.pill {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-mid);
  transition: all 0.2s ease;
}

.pill:hover {
  border-color: var(--card-hover-border);
  background: var(--card-hover-bg);
}

.pill-accent {
  background: rgba(196, 144, 106, 0.10);
  border-color: rgba(196, 144, 106, 0.22);
  color: var(--accent);
}

/* ============================================
   Tip Callout
   ============================================ */

.tip-callout {
  background: rgba(196, 144, 106, 0.04);
  border: 1px solid rgba(196, 144, 106, 0.12);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0;
}

.tip-callout .tip-label {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.tip-callout p {
  margin-bottom: 0;
  color: var(--text-mid);
}

/* ============================================
   Theme Swatch
   ============================================ */

.theme-swatch {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.theme-swatch:hover {
  background: var(--card-hover-bg);
  border-color: var(--card-hover-border);
}

.swatch-color {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  flex-shrink: 0;
}

.swatch-info {
  flex: 1;
}

.swatch-name {
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.swatch-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

@media (max-width: 900px) {
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.8rem; }
  h3 { font-size: 1.3rem; }

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

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  section {
    padding: 56px 0;
  }
}

@media (max-width: 640px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 52px;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    background: rgba(28, 30, 38, 0.96);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .container,
  .container-wide {
    padding: 0 16px;
  }

  section {
    padding: 40px 0;
  }

  .card {
    padding: 20px;
  }
}

/* ============================================
   Spacer / utility
   ============================================ */

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }
.text-center { text-align: center; }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }

/* Main content push below fixed nav + accent bar */
main {
  padding-top: 54px;
}