/* ==========================================================================
   ICEC - Intelligent Creator Experimental Class Design System
   Subdomain: c.openkub.com / icec.openkub.com
   ========================================================================== */

:root {
  --bg-dark: #070c18;
  --bg-navy: #0d1627;
  --bg-card: rgba(16, 26, 47, 0.85);
  --bg-card-hover: rgba(22, 36, 66, 0.95);
  --border-card: rgba(56, 78, 120, 0.35);
  --border-focus: rgba(6, 182, 212, 0.7);
  
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.25);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.2);
  --indigo: #6366f1;
  --purple: #8b5cf6;
  --amber: #f59e0b;
  --rose: #f43f5e;

  --gradient-tech: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #6366f1 100%);
  --gradient-glow: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(99, 102, 241, 0.1));
  --shadow-lg: 0 16px 40px -10px rgba(0, 0, 0, 0.5), 0 0 20px rgba(6, 182, 212, 0.08);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.3);
  
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 80% 10%, rgba(6, 182, 212, 0.08) 0%, transparent 45%),
              radial-gradient(circle at 10% 40%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 50% 90%, rgba(16, 185, 129, 0.05) 0%, transparent 60%),
              var(--bg-dark);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* ==================== Navigation Bar ==================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 12, 24, 0.85);
  border-bottom: 1px solid var(--border-card);
  transition: all 0.3s;
}

.nav-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand-badge {
  background: var(--gradient-tech);
  color: #fff;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  font-weight: 900;
  font-size: 0.95rem;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

.brand-text h1 {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
}

.brand-text small {
  font-size: 0.72rem;
  color: var(--cyan);
  display: block;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-item a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-sub);
}

.nav-item a:hover,
.nav-item.active a {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-item.active a {
  color: var(--cyan);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-nav-admissions {
  background: var(--gradient-tech);
  color: #fff !important;
  font-weight: 600;
  padding: 7px 16px !important;
  border-radius: 999px !important;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.35);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-nav-admissions:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 22px rgba(6, 182, 212, 0.5);
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-card);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
}

/* ==================== Global Utility Classes ==================== */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 60px 0;
}

.section-head {
  margin-bottom: 40px;
  text-align: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--cyan);
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.badge-tag.emerald {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--emerald);
}

.badge-tag.amber {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.3);
  color: var(--amber);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--gradient-tech);
  color: #fff;
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 0 28px rgba(6, 182, 212, 0.6);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-emerald {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.btn-emerald:hover {
  box-shadow: 0 0 28px rgba(16, 185, 129, 0.5);
  transform: translateY(-2px);
}

/* ==================== Hero Banner ==================== */
.hero {
  position: relative;
  padding: 70px 0 50px;
  background: radial-gradient(circle at 50% -20%, rgba(6, 182, 212, 0.18), transparent 70%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-copy h1 span.highlight {
  background: var(--gradient-tech);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.18rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 28px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.hero-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text-sub);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-showcase-card {
  background: linear-gradient(145deg, rgba(16, 26, 47, 0.9), rgba(11, 18, 35, 0.95));
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}

.showcase-media {
  border-radius: 16px;
  overflow: hidden;
  position: relative;
  background: #020617;
  border: 1px solid var(--border-card);
  margin-bottom: 18px;
}

.showcase-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.showcase-overlay-chip {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(7, 12, 24, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(6, 182, 212, 0.4);
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 12px 10px;
  text-align: center;
}

.stat-item b {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  display: block;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-item span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==================== 5-Stage Ladder ==================== */
.ladder-container {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.ladder-step {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 20px;
  position: relative;
  transition: all 0.3s ease;
}

.ladder-step:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  background: var(--bg-card-hover);
}

.ladder-num {
  font-size: 0.85rem;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(6, 182, 212, 0.15);
  color: var(--cyan);
  display: inline-block;
  margin-bottom: 12px;
}

.ladder-step.active .ladder-num {
  background: var(--gradient-tech);
  color: #fff;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
}

.ladder-step h3 {
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 8px;
}

.ladder-step .ladder-deliverable {
  font-size: 0.82rem;
  color: var(--emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 8px;
  border-radius: 6px;
  margin-bottom: 10px;
  display: inline-block;
  font-weight: 600;
}

.ladder-step p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==================== Forms & Admissions ==================== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 8px;
}

.form-label .required {
  color: var(--rose);
  margin-left: 4px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(11, 19, 36, 0.85);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--cyan);
  background: rgba(16, 26, 48, 0.95);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

.form-textarea {
  min-height: 110px;
  resize: vertical;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 5px;
}

/* ==================== Data Tables ==================== */
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th,
.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.9rem;
}

.data-table th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.status-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.status-admitted {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--emerald);
}

.status-waitlist {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: var(--amber);
}

.status-pending {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: var(--indigo);
}

/* ==================== Toast Notifications ==================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: #0f172a;
  color: #fff;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  animation: slideIn 0.3s ease;
  min-width: 280px;
  max-width: 420px;
}

.toast.success { border-color: var(--emerald); }
.toast.error { border-color: var(--rose); }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== Footer ==================== */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-card);
  background: rgba(5, 9, 18, 0.95);
  padding: 45px 0 25px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 35px;
}

.footer-brand b {
  font-size: 1.1rem;
  color: #fff;
  display: block;
  margin-bottom: 8px;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a:hover {
  color: var(--cyan);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .ladder-container { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-navy);
    border-bottom: 1px solid var(--border-card);
    flex-direction: column;
    padding: 16px;
  }
  .nav-menu.open { display: flex; }
  .mobile-toggle { display: block; }
  .hero-copy h1 { font-size: 2.2rem; }
  .grid-cols-2, .grid-cols-3, .grid-cols-4, .ladder-container { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ==================== Curriculum Map & Course Cards ==================== */
.course-filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.course-filter-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-card);
  color: var(--text-sub);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.course-filter-btn:hover {
  background: rgba(6, 182, 212, 0.1);
  border-color: var(--cyan);
  color: #fff;
}

.course-filter-btn.active {
  background: var(--gradient-tech);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.course-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.course-detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.course-detail-card:hover {
  transform: translateY(-4px);
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: var(--shadow-lg);
}

.course-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.course-semester-tag {
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.course-title-zh {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
  line-height: 1.35;
}

.course-role-badge {
  font-size: 0.82rem;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: 14px;
  display: block;
}

.course-plain-desc {
  background: rgba(6, 182, 212, 0.04);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-sub);
  margin-bottom: 14px;
}

.course-plain-desc b {
  color: #fff;
  display: block;
  margin-bottom: 4px;
  font-size: 0.84rem;
}

.course-skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.course-skill-pill {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3px 8px;
  border-radius: 6px;
  color: var(--text-muted);
}

.course-deliverable-box {
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.course-deliverable-box b {
  color: var(--emerald);
  font-weight: 700;
}

/* Semester Roadmap Matrix */
.roadmap-matrix {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.roadmap-semester-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  position: relative;
  transition: all var(--transition-normal);
}

.roadmap-semester-card:hover {
  border-color: rgba(6, 182, 212, 0.35);
}

.roadmap-sem-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.roadmap-sem-title {
  font-size: 1.35rem;
  font-weight: 900;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 12px;
}

.roadmap-sem-badge {
  font-size: 0.82rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--gradient-tech);
  color: #fff;
}

.roadmap-course-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.roadmap-chip-custom {
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: #fff;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
}

.roadmap-chip-collab {
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.2);
  color: var(--text-sub);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
}

.roadmap-sem-outcome {
  background: rgba(16, 185, 129, 0.05);
  border-left: 3px solid var(--emerald);
  padding: 10px 16px;
  border-radius: 0 8px 8px 0;
  font-size: 0.88rem;
  color: var(--text-sub);
}

.roadmap-sem-outcome b {
  color: var(--emerald);
}