/* ============================================================================
   KNOWLATHON INTERACTIVE LABS — BY VISHAL VYAS
   Dual-Theme Design System: Crisp Executive Light Mode & Luminous Obsidian Dark Mode
   ============================================================================ */

:root, [data-theme="dark"] {
  --bg-main: #060d1a;
  --bg-elevated: #0d182c;
  --bg-card: rgba(15, 27, 49, 0.88);
  --bg-card-hover: rgba(21, 37, 66, 0.95);
  --bg-subtle: #13223d;
  --bg-glass: rgba(10, 19, 36, 0.82);
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #f97316;
  --accent-primary-hover: #ea580c;
  --accent-secondary: #38bdf8;
  --accent-indigo: #818cf8;
  --border-color: rgba(148, 163, 184, 0.14);
  --border-highlight: rgba(249, 115, 22, 0.45);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #f43f5e;
  --shadow-card: 0 14px 34px -8px rgba(0, 0, 0, 0.45);
  --hero-gradient: radial-gradient(900px circle at 15% 10%, rgba(249, 115, 22, 0.14), transparent 55%),
                   radial-gradient(850px circle at 88% 15%, rgba(56, 189, 248, 0.13), transparent 55%);
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-subtle: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent-primary: #ea580c;
  --accent-primary-hover: #c2410c;
  --accent-secondary: #0284c7;
  --accent-indigo: #4f46e5;
  --border-color: rgba(15, 23, 42, 0.10);
  --border-highlight: rgba(234, 88, 12, 0.45);
  --success: #059669;
  --warning: #d97706;
  --danger: #e11d48;
  --shadow-card: 0 12px 30px -6px rgba(15, 23, 42, 0.07), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
  --hero-gradient: radial-gradient(900px circle at 15% 10%, rgba(234, 88, 12, 0.08), transparent 55%),
                   radial-gradient(850px circle at 88% 15%, rgba(2, 132, 199, 0.08), transparent 55%);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  background-image: var(--hero-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font-family: inherit;
}

/* Top Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  cursor: pointer;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, #f97316 0%, #fb923c 50%, #0284c7 100%);
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  box-shadow: 0 6px 18px rgba(249, 115, 22, 0.32);
}

.brand-title {
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.nav-btn {
  padding: 0.5rem 0.95rem;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: all 0.15s ease;
}

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

.nav-btn.active {
  background: var(--bg-subtle);
  border-color: var(--border-color);
  color: var(--accent-primary);
}

.btn-primary {
  padding: 0.58rem 1.15rem;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.28);
  transition: all 0.15s ease;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(234, 88, 12, 0.38);
}

.btn-secondary {
  padding: 0.55rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: all 0.15s ease;
}

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

/* Layout Containers */
.main-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}

/* Hero Section */
.hero-card {
  position: relative;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem 2.4rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2.5rem;
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 2.2rem;
  align-items: center;
}

@media (max-width: 960px) {
  .hero-card {
    grid-template-columns: 1fr;
    padding: 1.8rem 1.5rem;
  }
}

.eyebrow-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(249, 115, 22, 0.14);
  border: 1px solid rgba(249, 115, 22, 0.3);
  color: var(--accent-primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(1.85rem, 3.2vw, 2.65rem);
  font-weight: 850;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 1rem;
}

.hero-sub {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin: 0 0 1.4rem;
  max-width: 680px;
}

.credential-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.5rem;
}

.cred-pill {
  padding: 0.36rem 0.78rem;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* Instructor Spotlight Card inside Hero */
.instructor-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.55rem;
  position: relative;
}

.instructor-photo-wrap {
  width: 96px;
  height: 96px;
  border-radius: 20px;
  overflow: hidden;
  border: 2.5px solid var(--accent-primary);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
  flex-shrink: 0;
  background: var(--bg-card);
}

.instructor-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

/* Platform Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.8rem;
}

.benefit-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 1.4rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.benefit-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-secondary);
}

.benefit-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(249, 115, 22, 0.14);
  color: var(--accent-primary);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  margin-bottom: 0.85rem;
}

/* Course Cards Grid */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(370px, 1fr));
  gap: 1.5rem;
}

@media (max-width: 600px) {
  .courses-grid {
    grid-template-columns: 1fr;
  }
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.65rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.18s ease, border-color 0.18s ease;
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
}

.sim-preview-box {
  padding: 0.8rem 0.95rem;
  border-radius: 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  margin-bottom: 0.65rem;
}

.sim-benefit-list {
  margin: 0.5rem 0 0;
  padding-left: 1.15rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.sim-benefit-list li {
  margin-bottom: 0.25rem;
}

/* Simulator Block Card inside Course Detail */
.sim-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 1.65rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.15rem;
  transition: border-color 0.15s ease;
}

.sim-card:hover {
  border-color: var(--accent-secondary);
}

/* Testimonials Grid */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 1.45rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.68rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
}

.badge-free {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-paid {
  background: rgba(245, 158, 11, 0.16);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.badge-version {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-secondary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.badge-kind {
  background: rgba(129, 140, 248, 0.15);
  color: var(--accent-indigo);
}

/* Fullscreen Simulator Player Shell */
.player-shell {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg-main);
  display: flex;
  flex-direction: column;
}

.player-topbar {
  height: 58px;
  padding: 0 1.25rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.heartbeat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 1.8s infinite;
}

.pulse-dot.paused {
  background: var(--warning);
  animation: none;
}

@keyframes pulseGreen {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.65); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.player-iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: #0b1f3a;
}

/* Admin Dashboard Tables & Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.15rem;
  margin-bottom: 1.8rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.35rem;
  box-shadow: var(--shadow-card);
}

.kpi-label {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
}

.kpi-value {
  font-size: 1.9rem;
  font-weight: 850;
  margin: 0.35rem 0 0.2rem;
  letter-spacing: -0.02em;
}

.data-table-wrap {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table th, .data-table td {
  padding: 0.9rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--bg-subtle);
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(3, 7, 18, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.form-group {
  margin-bottom: 1.1rem;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-main);
  font-size: 0.92rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.upload-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  background: var(--bg-subtle);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.upload-dropzone:hover, .upload-dropzone.dragover {
  border-color: var(--accent-primary);
  background: rgba(249, 115, 22, 0.08);
}

.toast-notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  background: var(--bg-elevated);
  border: 1px solid var(--accent-primary);
  color: var(--text-main);
  padding: 0.9rem 1.25rem;
  border-radius: 14px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.4);
  font-weight: 600;
  font-size: 0.9rem;
  display: none;
  align-items: center;
  gap: 0.6rem;
}