/* ============================================================
   DARK/LIGHT MODE WITH GRID BACKGROUND
   ============================================================ */

:root {
  color-scheme: dark light;
  --bg: #0a0a0a;
  --fg: #ffffff;
  --muted: #888888;
  --line: #333333;
  --soft: #111111;
  --accent: #ffffff;
  --accent-soft: rgba(255, 255, 255, 0.1);
  --grid-color: rgba(255, 255, 255, 0.06);
}

[data-theme="light"] {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #666666;
  --line: #e5e5e5;
  --soft: #f5f5f5;
  --accent: #0a0a0a;
  --accent-soft: rgba(0, 0, 0, 0.08);
  --grid-color: rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  position: relative;
}

/* Grid Background Pattern */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
}

body > * {
  position: relative;
  z-index: 1;
}

::selection {
  background: var(--fg);
  color: var(--bg);
}

a {
  color: inherit;
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--fg);
  font-size: 18px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.theme-toggle:hover {
  border-color: var(--fg);
  background: var(--accent-soft);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

:root .theme-toggle .icon-sun {
  display: block;
}

:root .theme-toggle .icon-moon {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  padding: 18px clamp(20px, 5vw, 64px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  color: var(--fg);
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.02em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

nav a {
  text-decoration: none;
  transition: color 0.15s;
}

nav a:hover {
  color: var(--fg);
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-height: 82vh;
  padding: clamp(48px, 7vw, 96px) clamp(20px, 5vw, 64px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

h1, h2, h3, p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(56px, 11vw, 128px);
  line-height: 0.88;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 12px;
  font-size: 18px;
  color: var(--fg);
}

.lede {
  max-width: 680px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid var(--fg);
  border-radius: 6px;
  padding: 0 18px;
  background: transparent;
  color: var(--fg);
  font-weight: 700;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.button.primary {
  background: var(--fg);
  color: var(--bg);
}

.button:hover {
  background: var(--accent-soft);
}

.button.primary:hover {
  background: var(--muted);
}

/* Terminal Cards */
.terminal-card,
.terminal-image-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--fg);
  box-shadow: 16px 16px 0 var(--accent-soft);
}

.terminal-image-card {
  display: block;
  text-decoration: none;
}

.terminal-image-card img,
.demo-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.terminal-top {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding: 12px;
}

.terminal-top span {
  width: 10px;
  height: 10px;
  border: 1px solid var(--muted);
  border-radius: 999px;
}

/* Visual Demo Section */
.visual-demo {
  border-top: 1px solid var(--line);
  background: var(--soft);
}

.visual-demo .section-heading p:not(.eyebrow) {
  color: var(--muted);
  line-height: 1.65;
}

.demo-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  box-shadow: 12px 12px 0 var(--accent-soft);
}

.demo-actions {
  margin-top: 22px;
}

/* Showcase */
.showcase {
  border-top: 1px solid var(--line);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tui-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  min-height: 270px;
}

.tui-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding: 12px 14px;
  font-size: 13px;
  background: var(--accent-soft);
}

.tui-body {
  padding: 18px;
  font: 14px/1.65 "Cascadia Code", "Consolas", monospace;
}

.tui-title {
  margin-bottom: 18px;
  font-weight: 800;
  text-transform: uppercase;
}

.dark-panel {
  background: var(--soft);
  color: var(--fg);
}

.status {
  display: inline-flex;
  border-radius: 4px;
  padding: 0 6px;
  font-size: 12px;
  font-weight: 800;
}

.status.success {
  border: 1px solid var(--fg);
  background: var(--bg);
  color: var(--fg);
}

.status.muted {
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
}

.cursor {
  color: var(--fg);
  font-weight: 800;
}

.prompt-block {
  display: inline-flex;
  border-radius: 4px;
  margin: 0 4px 8px 0;
  padding: 3px 8px;
  background: var(--fg);
  color: var(--bg);
  font-weight: 800;
}

.prompt-block.outline {
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
}

/* Band */
.band {
  border-block: 1px solid var(--line);
  background: var(--soft);
  padding: 28px clamp(20px, 5vw, 64px);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.stat-grid div,
.plain-card,
.code-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  padding: 20px;
}

.stat-grid strong {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  color: var(--fg);
}

.stat-grid span,
.plain-card p,
.split p,
.feedback p {
  color: var(--muted);
  line-height: 1.65;
}

/* Sections */
.section {
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 64px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
}

.code-grid,
.card-grid,
.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Code Blocks */
pre {
  overflow-x: auto;
  margin: 0;
  padding: 22px;
  font: 14px/1.7 "Cascadia Code", "Consolas", monospace;
}

.code-grid pre {
  border-radius: 6px;
  background: var(--soft);
  color: var(--fg);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th, td {
  border-bottom: 1px solid var(--line);
  padding: 16px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--soft);
  font-size: 13px;
  text-transform: uppercase;
  color: var(--muted);
}

td code,
.plain-card code {
  border-radius: 4px;
  background: var(--soft);
  padding: 2px 6px;
  color: var(--fg);
}

/* FAQ */
.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  padding: 0 18px;
}

.faq-list summary {
  cursor: pointer;
  padding: 16px 0;
  color: var(--fg);
  font-weight: 800;
}

.faq-list p {
  color: var(--muted);
  line-height: 1.65;
}

.faq-list pre {
  border-radius: 6px;
  margin-bottom: 16px;
  background: var(--soft);
}

/* Check List */
.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

.check-list li::before {
  content: ">";
  margin-right: 10px;
  font-weight: 800;
  color: var(--muted);
}

/* Feedback / Founder */
.feedback {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: 28px;
  align-items: start;
  border-top: 1px solid var(--line);
  background: var(--soft);
}

.founder-section {
  gap: 32px;
}

.founder-card {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  padding: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.15);
}

.founder-avatar-wrap {
  display: flex;
  justify-content: center;
}

.founder-avatar {
  width: min(160px, 100%);
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  object-fit: cover;
}

.founder-info h2 {
  margin: 4px 0;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 0.95;
}

.founder-role {
  margin: 0 0 12px;
  color: var(--muted);
  font-weight: 800;
}

.founder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.email {
  display: inline-block;
  margin-top: 8px;
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 800;
  text-decoration: none;
}

/* Feedback Form */
.feedback-form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  padding: 22px;
}

.form-note {
  border-left: 3px solid var(--muted);
  margin-bottom: 20px;
  padding: 10px 12px;
  background: var(--accent-soft);
  color: var(--muted);
  font-size: 14px;
}

.feedback-form label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--muted);
}

.feedback-form input,
.feedback-form select,
.feedback-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 16px;
  padding: 11px 12px;
  background: var(--soft);
  color: var(--fg);
  font: inherit;
}

.feedback-form input:focus,
.feedback-form select:focus,
.feedback-form textarea:focus {
  border-color: var(--fg);
  outline: none;
}

.feedback-form textarea {
  resize: vertical;
}

.feedback-form button {
  min-height: 44px;
  border: 1px solid var(--fg);
  border-radius: 6px;
  background: var(--fg);
  color: var(--bg);
  padding: 0 18px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s;
}

.feedback-form button:hover {
  background: var(--muted);
}

.feedback-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.feedback-actions a {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 11px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.feedback-actions a:hover {
  border-color: var(--fg);
  color: var(--fg);
}

/* Footer */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding: 24px clamp(20px, 5vw, 64px);
  color: var(--muted);
  font-size: 14px;
}

/* ============================================================
   THEME GALLERY STYLES
   ============================================================ */

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

/* Large Preview Area */
.theme-preview-large {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
  overflow: hidden;
  margin-bottom: 28px;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.preview-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--fg);
}

.preview-category {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
}

.preview-image-wrap {
  padding: 20px;
  background: #0a0a0a;
}

[data-theme="light"] .preview-image-wrap {
  background: #f0f0f0;
}

.preview-image-wrap img {
  display: block;
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: 8px;
}

.preview-description {
  padding: 16px 20px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  border-top: 1px solid var(--line);
}

/* Thumbnail Grid */
.theme-thumbnails {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.theme-thumb {
  display: flex;
  flex-direction: column;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
  padding: 0;
  font: inherit;
  text-align: left;
  color: inherit;
}

.theme-thumb:hover {
  border-color: var(--muted);
  transform: translateY(-2px);
}

.theme-thumb.active {
  border-color: var(--fg);
}

.theme-thumb img {
  width: 100%;
  height: 100px;
  object-fit: cover;
  background: #0a0a0a;
}

[data-theme="light"] .theme-thumb img {
  background: #f0f0f0;
}

.thumb-name {
  display: block;
  padding: 10px 12px 4px;
  font-weight: 700;
  font-size: 14px;
  color: var(--fg);
}

.thumb-category {
  display: block;
  padding: 0 12px 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--muted);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 860px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .header-left {
    width: 100%;
    justify-content: space-between;
  }

  .hero,
  .code-grid,
  .card-grid,
  .split,
  .stat-grid,
  .showcase-grid,
  .feedback {
    grid-template-columns: 1fr;
  }

  .founder-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .founder-actions {
    justify-content: center;
  }

  .terminal-card,
  .demo-frame {
    box-shadow: 8px 8px 0 var(--accent-soft);
  }

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

@media (max-width: 480px) {
  .theme-thumbnails {
    grid-template-columns: 1fr;
  }
}