/* ==========================================================================
   SBCCAS Digital Academic Portal Styles
   Futuristic / Academic Cyber-Minimalist Theme
   ========================================================================== */

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #21262d;
  --bg-card-hover: #262c36;
  --border-color: #30363d;
  --border-highlight: #388bfd33;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  --accent-blue: #58a6ff;
  --accent-cyan: #38bdf8;
  --accent-purple: #a371f7;
  --accent-green: #3fb950;
  --accent-orange: #d29922;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --transition-speed: 0.2s;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography & Links */
a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-speed);
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4, h5 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-primary);
  font-size: 1.2rem;
  text-decoration: none;
}

.brand-icon {
  font-size: 1.5rem;
}

.brand-sub {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 400;
  margin-left: 0.2rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed);
  border: 1px solid transparent;
  text-decoration: none !important;
}

.btn-primary {
  background-color: #238636;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #2ea043;
}

.btn-secondary {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-blue);
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent-blue);
  background-color: rgba(88, 166, 255, 0.1);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 4rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
}

.hero-badge-strip {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 2.75rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 2.25rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Ecosystem Statistics Strip */
.stats-strip {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  text-align: center;
}

.stat-card {
  padding: 0.85rem 1rem;
  background-color: rgba(13, 17, 23, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-speed);
}

.stat-card:hover {
  border-color: var(--accent-cyan);
}

.stat-number {
  display: block;
  font-size: 2.1rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.25rem;
}

/* Badges & Pills */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.pill-cyan { border-color: rgba(56, 189, 248, 0.4); color: var(--accent-cyan); }
.pill-purple { border-color: rgba(163, 113, 247, 0.4); color: var(--accent-purple); }
.pill-green { border-color: rgba(63, 185, 80, 0.4); color: var(--accent-green); }

/* Common Sections */
.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 0.6rem;
}

.section-lead {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 680px;
  margin: 0 auto;
}

/* Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

/* Cards */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition-speed), border-color var(--transition-speed);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-blue);
}

.card-icon, .path-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.info-card h3, .path-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.info-card p, .path-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.card-link {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Course Filters */
.filter-pills {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.filter-pill {
  background-color: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.filter-pill:hover, .filter-pill.active {
  background-color: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

/* Catalog Controls */
.catalog-control-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.catalog-controls-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.catalog-controls-row .search-box {
  flex: 1 1 320px;
}

.sort-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sort-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
  white-space: nowrap;
}

.sort-select {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.92rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-speed);
}

.sort-select:focus {
  border-color: var(--accent-blue);
}

.search-box {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

.search-box input {
  width: 100%;
  padding: 0.9rem 2.8rem 0.9rem 2.8rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.search-box input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.clear-btn {
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  display: none;
}

.clear-btn:hover {
  color: var(--text-primary);
}

.tech-filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-filter-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-right: 0.35rem;
}

.tech-pill {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.tech-pill:hover, .tech-pill.active {
  background-color: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.catalog-meta {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Repositories Grid & Repo Card */
.repositories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.repo-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-speed);
}

.repo-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.repo-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
  gap: 0.5rem;
}

.repo-title {
  font-size: 1.15rem;
  font-family: var(--font-mono);
  word-break: break-word;
}

.repo-level {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: rgba(163, 113, 247, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(163, 113, 247, 0.3);
  white-space: nowrap;
}

.repo-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.repo-meta {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: auto;
}

.repo-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-tech {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: var(--bg-card);
  color: var(--accent-cyan);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.tag-course {
  font-size: 0.75rem;
  background-color: rgba(63, 185, 80, 0.1);
  color: var(--accent-green);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(63, 185, 80, 0.2);
}

.repo-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.85rem;
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.6rem;
}

.repo-metrics {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.metric-item {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.tag-featured-badge {
  font-size: 0.72rem;
  background-color: rgba(210, 153, 34, 0.15);
  color: var(--accent-orange);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(210, 153, 34, 0.4);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.repo-cat {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.repo-link {
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* AI Section Card */
.ai-card {
  background: radial-gradient(circle at 100% 0%, rgba(163, 113, 247, 0.1) 0%, var(--bg-secondary) 70%);
  border: 1px solid rgba(163, 113, 247, 0.3);
  padding: 2.75rem;
}

.ai-title {
  font-size: 1.85rem;
  margin: 1rem 0;
}

.ai-text {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  max-width: 820px;
}

.ai-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.principle-item {
  background-color: rgba(13, 17, 23, 0.6);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.principle-item strong {
  color: var(--text-primary);
}

/* Journey Steps */
.journey-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.step-card {
  position: relative;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--bg-card);
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 1rem;
}

.step-card h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.75rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 3rem;
}

.link-group h5 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.link-group a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.link-group a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Loading & Empty States */
.loading-state, .empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.1rem;
  }

  .site-header .container {
    flex-direction: column;
    gap: 0.75rem;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
  }

  .catalog-control-panel {
    gap: 1rem;
  }

  .footer-container {
    flex-direction: column;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .btn {
    width: 100%;
  }

  .repositories-grid {
    grid-template-columns: 1fr;
  }
}