/*
  AG VN ENGINE — Brutalist Monochrome Dark Theme
  Matching User Wireframe Concepts Exactly
*/

:root {
  --bg: #0A0C0F;
  --bg-card: #12151B;
  --bg-elevated: #181C24;
  --border: #FFFFFF;
  --border-dim: rgba(255, 255, 255, 0.2);
  --border-focus: #FFFFFF;
  --text-main: #FFFFFF;
  --text-muted: #8E96A4;
  --text-dim: #545B69;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Geist Mono', Consolas, monospace;
}

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

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  border-bottom: 2px solid var(--border);
  background: var(--bg);
}

.nav-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-btn {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 6px;
  transition: color 0.15s;
}

.lang-btn.active, .lang-btn:hover {
  color: var(--text-main);
  font-weight: 700;
  text-decoration: underline;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-center a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: opacity 0.15s;
}

.nav-center a:hover {
  opacity: 0.7;
}

.brand-title {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-main);
  text-decoration: none;
}

.nav-right {
  display: flex;
  align-items: center;
}

/* Wireframe Button (Boxed button like in concept) */
.btn-box {
  background: transparent;
  color: var(--text-main);
  border: 2px solid var(--border);
  padding: 8px 20px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.12s ease;
  user-select: none;
}

.btn-box:hover {
  background: var(--text-main);
  color: var(--bg);
}

.btn-box:active {
  transform: translateY(1px);
}

.btn-box.active {
  background: var(--text-main);
  color: var(--bg);
}

/* Hero Section (Upper Half of Index) */
.hero-section {
  padding: 48px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
}

/* Left Column: 3D Tilt Preview */
.preview-column {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview-stage {
  perspective: 1200px;
  width: 100%;
}

.preview-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 2px solid var(--border);
  background: #000000;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.1s ease-out, box-shadow 0.2s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

.preview-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  user-select: none;
  pointer-events: none;
}

.preview-label-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-main);
  background: rgba(0, 0, 0, 0.7);
  padding: 2px 8px;
  border: 1px solid var(--border-dim);
  text-transform: uppercase;
}

.platform-toggle-bar {
  display: flex;
  margin-top: 16px;
  border: 2px solid var(--border);
}

.platform-btn {
  background: transparent;
  color: var(--text-main);
  border: none;
  padding: 8px 28px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.platform-btn:first-child {
  border-right: 2px solid var(--border);
}

.platform-btn.active {
  background: var(--text-main);
  color: var(--bg);
}

/* Right Column: Key Highlights Carousel */
.feature-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-title-box {
  border: 2px solid var(--border);
  padding: 16px 20px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: var(--bg-card);
}

.feature-desc-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feature-desc-box {
  flex: 1;
  border: 2px solid var(--border);
  padding: 24px;
  min-height: 220px;
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.feature-nav-btn {
  width: 38px;
  height: 90px;
  background: transparent;
  color: var(--text-main);
  border: 2px solid var(--border);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s;
  flex-shrink: 0;
}

.feature-nav-btn:hover {
  background: var(--text-main);
  color: var(--bg);
}

.feature-examples-cta {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

/* EXAMPLES Section (Lower Half of Index) */
.examples-section {
  padding: 60px 0 90px;
  border-top: 2px solid var(--border);
}

.section-main-title {
  text-align: center;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 48px;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.example-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.example-name-box {
  border: 2px solid var(--border);
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-mono);
  background: var(--bg-card);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.example-img-box {
  border: 2px solid var(--border);
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000000;
  overflow: hidden;
}

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

.example-desc-box {
  border: 2px solid var(--border);
  padding: 14px 16px;
  font-size: 14px;
  color: var(--text-muted);
  min-height: 88px;
  line-height: 1.5;
  background: var(--bg-card);
}

.example-link-btn {
  align-self: flex-start;
  padding: 6px 20px;
  font-size: 14px;
}

/* Footer */
footer {
  border-top: 2px solid var(--border);
  padding: 32px 0;
  text-align: center;
  margin-top: auto;
}

.footer-link {
  color: var(--text-main);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.footer-link:hover {
  text-decoration: underline;
}

/* Documentation Page */
.doc-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border-dim);
  margin-bottom: 32px;
}

.doc-tabs {
  display: flex;
  border: 2px solid var(--border);
}

.doc-tab-btn {
  background: transparent;
  color: var(--text-main);
  border: none;
  padding: 10px 24px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-tab-btn:first-child {
  border-right: 2px solid var(--border);
}

.doc-tab-btn.active {
  background: var(--text-main);
  color: var(--bg);
}

.doc-section {
  display: none;
}

.doc-section.active {
  display: block;
}

.doc-block {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  padding: 24px;
  margin-bottom: 28px;
}

.doc-block h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 8px;
}

.code-wrap {
  background: #000000;
  border: 1px solid var(--border-dim);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
  margin: 14px 0;
  color: #E2E8F0;
}

.code-wrap pre {
  margin: 0;
}

.btn-copy {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  color: var(--text-main);
  font-size: 12px;
  font-family: var(--font-mono);
  padding: 4px 8px;
  cursor: pointer;
}

.btn-copy:hover {
  background: var(--text-main);
  color: var(--bg);
}

/* Download Page */
.download-card {
  max-width: 760px;
  margin: 60px auto 100px;
  border: 2px solid var(--border);
  padding: 40px;
  background: var(--bg-card);
}

.download-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 28px;
}

.download-instructions {
  background: var(--bg-elevated);
  border: 1px solid var(--border-dim);
  padding: 20px;
  margin-bottom: 28px;
  font-size: 14px;
  line-height: 1.7;
}

/* Login Page */
.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 160px);
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 420px;
  border: 2px solid var(--border);
  padding: 36px;
  background: var(--bg-card);
}

.login-title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
  text-align: center;
}

.login-sub {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 28px;
  font-family: var(--font-mono);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.input-box {
  width: 100%;
  background: #000000;
  border: 2px solid var(--border);
  color: var(--text-main);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  outline: none;
}

.input-box:focus {
  border-color: #60A5FA;
}

.alert-error {
  border: 1px solid #EF4444;
  background: rgba(239, 68, 68, 0.1);
  color: #F87171;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 18px;
}

/* Dev Portal UI */
.portal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 0 20px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 32px;
}

.portal-tabs {
  display: flex;
  gap: 12px;
}

.portal-tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: 2px solid var(--border-dim);
  padding: 8px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.12s;
}

.portal-tab-btn.active, .portal-tab-btn:hover {
  background: var(--text-main);
  color: var(--bg);
  border-color: var(--border);
}

.portal-tab-content {
  display: none;
}

.portal-tab-content.active {
  display: block;
}

/* File Explorer */
.file-explorer {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  min-height: 520px;
}

.user-folder-list {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
}

.user-folder-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 14px;
  transition: background 0.1s;
}

.user-folder-item:hover, .user-folder-item.active {
  background: var(--bg-elevated);
}

.user-folder-item.is-me {
  font-weight: 700;
}

.file-view-panel {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.file-view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-dim);
  margin-bottom: 16px;
}

/* Drag & Drop Upload Zone */
.upload-dropzone {
  border: 2px dashed var(--border-dim);
  background: #000000;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  margin-bottom: 20px;
  transition: border-color 0.15s;
}

.upload-dropzone.dragover, .upload-dropzone:hover {
  border-color: var(--border);
}

.file-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.file-table th, .file-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-dim);
  text-align: left;
}

.file-table th {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
}

.file-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

/* Modal Viewers */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--bg-card);
  border: 2px solid var(--border);
  width: 100%;
  max-width: 800px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  padding: 24px;
  position: relative;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.modal-code-body {
  flex: 1;
  background: #000000;
  border: 1px solid var(--border-dim);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  overflow: auto;
  white-space: pre-wrap;
}

/* SVG Icon Helper */
.icon-svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  display: inline-block;
  vertical-align: middle;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .examples-grid {
    grid-template-columns: 1fr;
  }
  .nav-center {
    gap: 16px;
  }
  .brand-title {
    font-size: 18px;
  }
  .file-explorer {
    grid-template-columns: 1fr;
  }
}

/* Dev Portal Extras & Forum */
.badge-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  padding: 2px 6px;
  border: 1px solid var(--border);
  letter-spacing: 0.05em;
  font-weight: 700;
}

.badge-tag.badge-pinned {
  background: var(--text-main);
  color: var(--bg);
}

.badge-tag.badge-admin {
  background: #3B82F6;
  color: #FFFFFF;
  border-color: #3B82F6;
}

.badge-tag.badge-user {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border-dim);
}

.btn-icon-action {
  background: transparent;
  border: 1px solid var(--border-dim);
  color: var(--text-main);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.12s;
  text-decoration: none;
}

.btn-icon-action:hover {
  background: var(--text-main);
  color: var(--bg);
  border-color: var(--border);
}

.btn-icon-action.danger:hover {
  background: #EF4444;
  color: #FFFFFF;
  border-color: #EF4444;
}

/* Forum */
.forum-topic-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.forum-topic-card {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: border-color 0.15s;
}

.forum-topic-card:hover {
  border-color: var(--border);
}

.forum-topic-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
}

.forum-topic-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.forum-thread-post {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  padding: 20px;
  margin-bottom: 16px;
}

.forum-post-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.forum-post-content {
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
  color: #E2E8F0;
}

/* Admin Tabs */
.admin-card {
  border: 1px solid var(--border-dim);
  background: var(--bg-card);
  padding: 24px;
  margin-bottom: 32px;
}

.admin-card-title {
  font-size: 18px;
  font-weight: 800;
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 12px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-sub-tabs {
  display: flex;
  border-bottom: 2px solid var(--border-dim);
  margin-bottom: 24px;
  gap: 8px;
}

.admin-sub-tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  margin-bottom: -2px;
  transition: all 0.12s;
}

.admin-sub-tab-btn.active, .admin-sub-tab-btn:hover {
  color: var(--text-main);
  border-bottom-color: var(--border);
}