/* ==========================================================================
   Design System: Minimalist Editorial UI for PT Student Hub
   Base Canvas: Warm Bone (#F9F8F6)
   Text: Slate Black (#161A1D)
   Accents: Muted Anatomical Pastels + Smart LINE Green
   ========================================================================== */

:root {
  --canvas-bg: #F9F8F6;
  --surface-card: #FFFFFF;
  --surface-subtle: #F3F1EC;
  --border-subtle: #E8E5DE;
  --border-strong: #D5D1C7;
  
  --text-primary: #1A1D20;
  --text-secondary: #5D636B;
  --text-muted: #8B909A;
  
  --brand-navy: #1E293B;
  --brand-accent: #2563EB;
  
  --subject-anatomy: #3B5B82;
  --subject-anatomy-bg: #EEF3F8;
  --subject-physiology: #8F3B4B;
  --subject-physiology-bg: #FAEFF1;
  --subject-kinesiology: #2D6A4F;
  --subject-kinesiology-bg: #EDF6F1;
  
  --line-green: #06C755;
  --line-dark: #05A848;
  --line-bg: #F0FAF4;

  --font-sans: 'Plus Jakarta Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Shippori Mincho', 'Hiragino Mincho ProN', serif;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-subtle: 0 2px 8px rgba(26, 29, 32, 0.04);
  --shadow-hover: 0 6px 18px rgba(26, 29, 32, 0.08);
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--canvas-bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249, 248, 246, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--line-bg);
  border: 1px solid rgba(6, 199, 85, 0.25);
  color: var(--line-dark);
  padding: 0.45rem 0.85rem;
  border-radius: 9999px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: rgba(6, 199, 85, 0.15);
  transform: translateY(-1px);
}

.nav-cta .icon {
  width: 16px;
  height: 16px;
}

/* ==========================================================================
   Main & Hero Section
   ========================================================================== */
.site-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem;
}

.hero-section {
  padding: 3rem 0 4rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-subtle);
}

.hero-tag .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--line-green);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--subject-anatomy);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 740px;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--brand-navy);
  color: #FFFFFF;
  border: 1px solid var(--brand-navy);
}

.btn-primary:hover {
  background: #0F172A;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background: var(--surface-card);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

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

.arrow-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.2s ease;
}

.btn-primary:hover .arrow-icon {
  transform: translateX(3px);
}

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

.stat-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: var(--shadow-subtle);
}

.stat-num {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Section Shared Styles
   ========================================================================== */
.section-badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* ==========================================================================
   Concept Section
   ========================================================================== */
.concept-section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.concept-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.concept-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-subtle);
}

.concept-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.concept-icon svg {
  width: 22px;
  height: 22px;
}

.concept-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.concept-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   Curation Hub Section
   ========================================================================== */
.curation-section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.curation-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.subject-tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--surface-subtle);
  padding: 0.35rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  background: transparent;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

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

.tab-btn.active {
  background: var(--surface-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-subtle);
}

.tab-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.tab-btn[data-subject="anatomy"] { --subject-color: var(--subject-anatomy); }
.tab-btn[data-subject="physiology"] { --subject-color: var(--subject-physiology); }
.tab-btn[data-subject="kinesiology"] { --subject-color: var(--subject-kinesiology); }

.tab-btn.active[data-subject="anatomy"] .tab-indicator { background: var(--subject-anatomy); }
.tab-btn.active[data-subject="physiology"] .tab-indicator { background: var(--subject-physiology); }
.tab-btn.active[data-subject="kinesiology"] .tab-indicator { background: var(--subject-kinesiology); }

/* Unit Filter Chips */
.unit-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.unit-chip {
  border: 1px solid var(--border-subtle);
  background: var(--surface-card);
  color: var(--text-secondary);
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.unit-chip:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.unit-chip.active {
  background: var(--brand-navy);
  color: #FFFFFF;
  border-color: var(--brand-navy);
}

/* Video Grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.video-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.video-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
}

.video-thumb-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #111;
  overflow: hidden;
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.video-card:hover .video-thumb {
  transform: scale(1.03);
}

.video-tag-pill {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  color: #FFF;
}

.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.8);
  color: #FFF;
}

.video-info {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.video-channel {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.video-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-memo {
  font-size: 0.825rem;
  color: var(--text-secondary);
  background: var(--surface-subtle);
  border-left: 3px solid var(--subject-anatomy);
  padding: 0.5rem 0.75rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: auto;
  line-height: 1.5;
}

.video-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 1rem;
  padding: 0.55rem;
  border-radius: var(--radius-md);
  font-size: 0.825rem;
  font-weight: 600;
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: var(--transition);
}

.video-link-btn:hover {
  background: #111;
  color: #FFF;
  border-color: #111;
}

/* ==========================================================================
   LINE Bot Section (Clean Dark & Smart Green)
   ========================================================================== */
.line-bot-section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.line-bot-card {
  background: linear-gradient(145deg, #182026, #0F1418);
  color: #FFFFFF;
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.line-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1rem;
}

.line-badge {
  background: rgba(6, 199, 85, 0.2);
  border: 1px solid var(--line-green);
  color: var(--line-green);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
}

.line-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 1rem;
}

.text-line-green {
  color: var(--line-green);
}

.line-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: 1.75rem;
}

.line-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.line-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.9);
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--line-green);
  flex-shrink: 0;
  margin-top: 2px;
}

.line-action-box {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn-line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: var(--line-green);
  color: #FFFFFF;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(6, 199, 85, 0.35);
}

.btn-line:hover {
  background: var(--line-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(6, 199, 85, 0.45);
}

.line-icon {
  width: 22px;
  height: 22px;
}

.line-subtext {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
}

/* QR Frame */
.qr-container {
  display: flex;
  justify-content: center;
}

.qr-card {
  background: #FFFFFF;
  color: var(--text-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  max-width: 240px;
  width: 100%;
}

.qr-header {
  text-align: center;
}

.qr-badge {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  background: var(--surface-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.qr-header p {
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

.qr-frame {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  padding: 8px;
  background: #FFFFFF;
}

.qr-svg {
  width: 100%;
  height: 100%;
}

.qr-footer-caption {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Channels Section
   ========================================================================== */
.channels-section {
  padding: 4rem 0;
}

.channels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.channel-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: var(--transition);
}

.channel-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-subtle);
}

.channel-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
}

.tag-anatomy { background: var(--subject-anatomy-bg); color: var(--subject-anatomy); }
.tag-physiology { background: var(--subject-physiology-bg); color: var(--subject-physiology); }
.tag-kinesiology { background: var(--subject-kinesiology-bg); color: var(--subject-kinesiology); }
.tag-exam { background: #FDF4E7; color: #B45309; }

.channel-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.channel-body {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.channel-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 0.75rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--surface-card);
  padding: 3.5rem 1.5rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-brand .brand-title {
  font-size: 1.1rem;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.disclaimer {
  margin-top: 0.5rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .line-bot-card {
    grid-template-columns: 1fr;
    padding: 2.5rem 1.75rem;
    gap: 2rem;
  }

  .qr-container {
    width: 100%;
  }

  .qr-card {
    max-width: 100%;
    flex-direction: row;
    justify-content: center;
  }

  .header-nav .nav-link {
    display: none;
  }
}

/* ==========================================================================
   Student Progress & Weakness PDF Section
   ========================================================================== */
.progress-section {
  padding: 1.5rem 0 3rem;
}

.progress-card {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: var(--shadow-subtle);
}

.progress-title-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.pulse-icon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}

.progress-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.progress-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.progress-meter-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.meter-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.meter-stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.meter-stat .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.meter-stat .stat-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.text-accent {
  color: var(--accent) !important;
}

.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, #38bdf8 100%);
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-pdf {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border: none;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
}

.btn-pdf:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}

.btn-reset-link {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0.5rem;
}

.btn-reset-link:hover {
  color: #ef4444;
}

/* ==========================================================================
   Instant Search Hub Section
   ========================================================================== */
.search-hub-section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.search-hub-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.search-hub-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0.5rem 0 0.25rem;
}

.search-hub-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.search-input-wrapper {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.search-input-box {
  position: relative;
  flex: 1;
  min-width: 280px;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1rem;
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input-box input {
  width: 100%;
  padding: 0.85rem 2.8rem 0.85rem 3rem;
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.search-input-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.search-clear-btn {
  position: absolute;
  right: 0.85rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

.btn-search-submit {
  background: var(--accent);
  color: #0f172a;
  border: none;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.btn-search-submit:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.search-quick-tags {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
}

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

.quick-tag-btn {
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.quick-tag-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.search-results-area {
  margin-top: 1rem;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 1.5rem;
}

.results-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.results-count {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.results-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
}

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

.search-loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.search-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.search-hit-card {
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.search-hit-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-subtle);
}

.hit-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.hit-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hit-channel-badge {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.hit-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.hit-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
}

.hit-play-btn {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.hit-play-btn:hover {
  background: #ef4444;
  color: #ffffff;
}

/* ==========================================================================
   Quiz Modal & Card Quiz Trigger
   ========================================================================== */
.card-quiz-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.65rem 1rem;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(14, 165, 233, 0.1) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.card-quiz-btn:hover {
  background: var(--accent);
  color: #0f172a;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(6px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-container {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.modal-badge {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.15);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.3rem;
  line-height: 1.4;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

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

.modal-body {
  padding: 1.75rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.quiz-question-box {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.6;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.quiz-opt-btn {
  text-align: left;
  padding: 0.85rem 1.15rem;
  background: var(--surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.quiz-opt-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
}

.quiz-opt-btn.correct {
  background: rgba(34, 197, 94, 0.15) !important;
  border-color: #22c55e !important;
  color: #22c55e !important;
  font-weight: 700;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: #ef4444 !important;
  color: #ef4444 !important;
}

.quiz-explanation-box {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-footer {
  padding: 1rem 1.75rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface-subtle);
}

.quiz-progress-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   A4 Print & Weakness PDF Styles (@media print)
   ========================================================================== */
.print-only {
  display: none;
}

@media print {
  body {
    background: #ffffff !important;
    color: #111111 !important;
    font-size: 11pt !important;
  }

  .site-header,
  .site-main,
  .site-footer,
  .modal-overlay {
    display: none !important;
  }

  .print-only {
    display: block !important;
    padding: 20mm 15mm;
  }

  .print-header {
    border-bottom: 2px solid #111111;
    padding-bottom: 8px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
  }

  .print-header h1 {
    font-size: 18pt;
    font-weight: 700;
    margin: 0;
    color: #000000;
  }

  .print-meta {
    font-size: 9pt;
    color: #555555;
  }

  .print-q-card {
    page-break-inside: avoid;
    border: 1px solid #cccccc;
    border-radius: 4px;
    padding: 14px 18px;
    margin-bottom: 16px;
    background: #fafafa;
  }

  .print-q-title {
    font-size: 11pt;
    font-weight: 700;
    margin-bottom: 8px;
    color: #000000;
  }

  .print-opt-list {
    margin: 0 0 10px 18px;
    padding: 0;
    font-size: 10pt;
    line-height: 1.6;
  }

  .print-ans-box {
    border-top: 1px dashed #bbbbbb;
    padding-top: 8px;
    font-size: 9.5pt;
    color: #222222;
    line-height: 1.5;
  }

  .print-ans-box strong {
    color: #b91c1c;
  }
}