/* DevConnect Showcase — Technical Documentation Style */

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

:root {
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --bg-code: #1e1e2e;
  --text: #1a1a2e;
  --text-secondary: #555;
  --text-muted: #888;
  --border: #e2e4ea;
  --accent: #4F46E5;
  --accent-light: #EEF2FF;
  --red: #EF4444;
  --blue: #3B82F6;
  --green: #10B981;
  --purple: #8B5CF6;
  --orange: #F59E0B;
  --mint: #00D9A6;
  --gray: #6B7280;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --font: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-w: 1200px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== HEADER ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(248,249,252,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.header-brand { display: flex; align-items: center; gap: 10px; }
.header-logo { width: 28px; height: 28px; color: var(--accent); }
.header-title {
  font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-badge {
  font-size: 0.65rem; font-weight: 600; text-transform: uppercase;
  background: var(--accent-light); color: var(--accent);
  padding: 2px 8px; border-radius: 20px;
}
.header-nav { display: flex; gap: 24px; }
.header-nav a {
  font-size: 0.85rem; font-weight: 500; color: var(--text-secondary);
  text-decoration: none; transition: color 0.15s;
}
.header-nav a:hover { color: var(--accent); }

/* ===== OVERVIEW ===== */
.overview {
  background: linear-gradient(135deg, var(--accent) 0%, var(--purple) 100%);
  color: #fff;
}
.overview-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 28px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  flex-wrap: wrap;
}
.overview-desc {
  font-size: 0.95rem; opacity: 0.92; max-width: 560px; line-height: 1.5;
}
.overview-stats { display: flex; gap: 28px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.75rem; font-weight: 800; }
.stat-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.8; }

/* ===== SECTIONS ===== */
.section {
  max-width: var(--max-w); margin: 0 auto;
  padding: 48px 24px;
}
.section-header { margin-bottom: 24px; }
.section-header h2 {
  font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.section-header p { color: var(--text-secondary); font-size: 0.9rem; }

/* ===== FILTER BAR ===== */
.filter-bar {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px;
}
.filter-btn {
  padding: 6px 14px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--bg-card);
  font-size: 0.8rem; font-weight: 500; color: var(--text-secondary);
  cursor: pointer; transition: all 0.15s; font-family: var(--font);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}

/* ===== SCREEN GRID ===== */
.screen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.screen-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.screen-card:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-md);
}
.screen-card.hidden { display: none; }
.screen-card-img {
  aspect-ratio: 9/19; overflow: hidden; background: #f0f1f5;
}
.screen-card-img img {
  width: 100%; height: 100%; object-fit: cover; object-position: top;
}
.screen-card-info { padding: 10px 12px; }
.screen-card-title {
  font-size: 0.8rem; font-weight: 600;
  display: flex; align-items: baseline; gap: 6px;
}
.screen-card-num {
  font-size: 0.7rem; color: var(--accent); font-family: var(--mono); font-weight: 500;
}
.screen-card-meta {
  font-size: 0.7rem; color: var(--text-muted); margin-top: 2px;
}
.screen-card-dots {
  display: flex; gap: 3px; margin-top: 6px;
}
.dot {
  width: 6px; height: 6px; border-radius: 50%;
}

/* ===== ARCHITECTURE ===== */
.arch-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px; margin-bottom: 28px;
}
.arch-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.arch-card-header {
  padding: 14px 16px; display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--border);
}
.arch-icon { font-size: 1.2rem; }
.arch-card-header h3 { font-size: 0.95rem; font-weight: 700; }
.arch-card-body { padding: 12px 16px; }
.arch-card-body code {
  display: inline-block; font-family: var(--mono); font-size: 0.75rem;
  background: var(--accent-light); color: var(--accent);
  padding: 2px 8px; border-radius: 4px; margin-bottom: 10px;
}
.arch-card-body ul { list-style: none; }
.arch-card-body li {
  font-size: 0.82rem; color: var(--text-secondary);
  padding: 3px 0; padding-left: 14px;
  position: relative;
}
.arch-card-body li::before {
  content: '›'; position: absolute; left: 0;
  color: var(--accent); font-weight: 700;
}

.arch-flow {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px; margin-bottom: 28px;
}
.arch-flow h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; }

.code-block {
  background: var(--bg-code); color: #cdd6f4;
  font-family: var(--mono); font-size: 0.78rem;
  padding: 16px 20px; border-radius: var(--radius);
  overflow-x: auto; line-height: 1.7;
  white-space: pre;
}

.principles-header {
  margin-bottom: 16px;
}
.principles-header h3 {
  font-size: 1.1rem; font-weight: 700; margin-bottom: 4px;
}
.principles-header p {
  font-size: 0.85rem; color: var(--text-secondary);
}
.principles-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}
.principle-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.principle-card h4 {
  font-size: 0.85rem; font-weight: 700; margin-bottom: 4px;
  color: var(--accent);
}
.principle-card p {
  font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 8px;
}
.principle-card code {
  display: block; font-family: var(--mono); font-size: 0.72rem;
  background: #f5f5f8; color: var(--text);
  padding: 6px 10px; border-radius: 4px;
  word-break: break-all;
}

/* ===== TECH TABLE ===== */
.tech-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-card); border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid var(--border);
}
.tech-table thead { background: #f5f6fa; }
.tech-table th {
  text-align: left; padding: 12px 16px;
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--text-secondary);
  border-bottom: 2px solid var(--border);
}
.tech-table td {
  padding: 10px 16px; font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.tech-table tr:last-child td { border-bottom: none; }
.tech-table tr:hover { background: #fafbfd; }
.tech-table td:last-child { color: var(--text-secondary); font-size: 0.8rem; }

.tag {
  display: inline-block; font-size: 0.65rem; font-weight: 600;
  padding: 2px 8px; border-radius: 4px; text-transform: uppercase;
  letter-spacing: 0.03em;
}
.tag--blue { background: #EFF6FF; color: var(--blue); }
.tag--red { background: #FEF2F2; color: var(--red); }
.tag--green { background: #ECFDF5; color: var(--green); }
.tag--purple { background: #F5F3FF; color: var(--purple); }
.tag--mint { background: #E6FFF9; color: #059669; }
.tag--orange { background: #FFFBEB; color: #D97706; }
.tag--gray { background: #F3F4F6; color: var(--gray); }

/* ===== FEATURES LIST ===== */
.features-filter {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px;
}
.features-list {
  display: flex; flex-direction: column; gap: 8px;
}
.feature-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.feature-item.hidden { display: none; }
.feature-header {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; cursor: pointer;
  font-family: var(--font);
  background: none; border: none; width: 100%;
  text-align: left; font-size: 0.88rem;
  transition: background 0.1s;
}
.feature-header:hover { background: #fafbfd; }
.feature-code {
  font-family: var(--mono); font-size: 0.75rem; font-weight: 600;
  min-width: 36px;
}
.feature-name { font-weight: 600; flex: 1; }
.feature-difficulty {
  display: flex; gap: 2px; font-size: 0.7rem; color: var(--orange);
}
.feature-time {
  font-size: 0.72rem; color: var(--text-muted); font-family: var(--mono);
}
.feature-chevron {
  width: 16px; height: 16px; color: var(--text-muted);
  transition: transform 0.2s;
}
.feature-item.open .feature-chevron { transform: rotate(180deg); }
.feature-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease;
}
.feature-item.open .feature-body { max-height: 2000px; }
.feature-content {
  padding: 0 16px 16px;
  border-top: 1px solid var(--border);
}
.feature-summary {
  font-size: 0.85rem; color: var(--text); font-weight: 500;
  margin: 12px 0 8px;
}
.feature-details {
  font-size: 0.82rem; color: var(--text-secondary);
  line-height: 1.6; margin-bottom: 8px;
}
.feature-meta {
  display: flex; gap: 16px; font-size: 0.75rem;
  padding-top: 8px; border-top: 1px solid var(--border);
}
.feature-meta span { font-weight: 500; }
.feature-cat-dot {
  width: 8px; height: 8px; border-radius: 50%; display: inline-block;
  margin-right: 4px; vertical-align: middle;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.modal-overlay.active { display: flex; }
.modal {
  background: var(--bg-card); border-radius: var(--radius-lg);
  max-width: 960px; width: 100%; max-height: 90vh;
  overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.modal-top {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg-card); z-index: 1;
}
.modal-close {
  background: none; border: none; cursor: pointer; color: var(--text-muted);
  padding: 4px; border-radius: 4px;
}
.modal-close:hover { color: var(--text); background: #f0f1f5; }
.modal-counter {
  font-family: var(--mono); font-size: 0.8rem; color: var(--text-muted);
  flex: 1;
}
.modal-nav { display: flex; gap: 4px; }
.modal-nav-btn {
  background: none; border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 8px; cursor: pointer;
  color: var(--text-secondary); transition: all 0.1s;
}
.modal-nav-btn:hover { border-color: var(--accent); color: var(--accent); }

.modal-body {
  display: grid; grid-template-columns: 280px 1fr;
  gap: 0;
}
.modal-preview {
  padding: 20px; background: #f5f6fa;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  border-right: 1px solid var(--border);
}
.modal-img {
  width: 100%; border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.modal-zoom { display: flex; gap: 6px; }
.zoom-btn {
  width: 30px; height: 30px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg-card);
  font-size: 1rem; cursor: pointer; color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono);
}
.zoom-btn:hover { border-color: var(--accent); color: var(--accent); }

.modal-info { padding: 20px; overflow-y: auto; }
.modal-title {
  font-size: 1.1rem; font-weight: 700; margin-bottom: 6px;
}
.modal-desc {
  font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 12px;
  line-height: 1.5;
}
.modal-patterns {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px;
}
.modal-pattern {
  font-size: 0.7rem; font-weight: 500;
  background: var(--accent-light); color: var(--accent);
  padding: 3px 10px; border-radius: 20px;
}
.modal-features-label {
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-muted);
  margin-bottom: 10px;
  padding-bottom: 6px; border-bottom: 1px solid var(--border);
}
.modal-features { display: flex; flex-direction: column; gap: 6px; }

.modal-feat {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.modal-feat-header {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; cursor: pointer;
  background: none; border: none; width: 100%; text-align: left;
  font-family: var(--font); font-size: 0.82rem;
}
.modal-feat-header:hover { background: #fafbfd; }
.modal-feat-code {
  font-family: var(--mono); font-size: 0.7rem; font-weight: 600;
  color: var(--accent);
}
.modal-feat-name { font-weight: 600; flex: 1; font-size: 0.82rem; }
.modal-feat-stars { font-size: 0.65rem; color: var(--orange); }
.modal-feat-chevron {
  width: 14px; height: 14px; color: var(--text-muted);
  transition: transform 0.2s;
}
.modal-feat.open .modal-feat-chevron { transform: rotate(180deg); }
.modal-feat-body {
  max-height: 0; overflow: hidden; transition: max-height 0.3s;
}
.modal-feat.open .modal-feat-body { max-height: 800px; }
.modal-feat-content {
  padding: 8px 12px 12px; border-top: 1px solid var(--border);
  font-size: 0.8rem;
}
.modal-feat-content .summary {
  font-weight: 500; margin-bottom: 4px; color: var(--text);
}
.modal-feat-content .details {
  color: var(--text-secondary); line-height: 1.5;
}
.modal-feat-content .meta {
  margin-top: 8px; font-size: 0.72rem;
  display: flex; gap: 12px; color: var(--text-muted);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border); background: var(--bg-card);
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 20px 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 8px;
  font-size: 0.8rem; color: var(--text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .overview-inner { flex-direction: column; text-align: center; }
  .overview-stats { justify-content: center; }
  .screen-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .modal-body { grid-template-columns: 1fr; }
  .modal-preview { border-right: none; border-bottom: 1px solid var(--border); }
  .arch-grid { grid-template-columns: 1fr; }
  .principles-grid { grid-template-columns: 1fr; }
  .tech-table { font-size: 0.75rem; }
  .tech-table th, .tech-table td { padding: 8px 10px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .screen-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .section { padding: 32px 16px; }
  .overview-inner { padding: 20px 16px; }
}