/* ============================================================================
   eknarin.com - Modern & Clean Stylesheet
   ออกแบบสำหรับเว็บไซต์ส่วนตัวครูเอก + คลังสื่อการสอน & แอปพลิเคชันช่วยงานครู
   ============================================================================ */

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-subtle: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --accent-border: #bfdbfe;
  --teal: #0d9488;
  --teal-soft: #f0fdfa;
  --amber: #d97706;
  --amber-soft: #fffbeb;
  --danger: #dc2626;
  --success: #16a34a;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.07), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 35px -10px rgba(37, 99, 235, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

[data-theme="dark"] {
  --bg-primary: #0b1120;
  --bg-secondary: #151f32;
  --bg-subtle: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --accent-border: rgba(59, 130, 246, 0.35);
  --teal: #14b8a6;
  --teal-soft: rgba(20, 184, 166, 0.15);
  --amber: #f59e0b;
  --amber-soft: rgba(245, 158, 11, 0.15);
  --border: #26354d;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 35px -10px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Prompt', 'Sarabun', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s ease, border-color 0.25s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.88);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.brand-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.brand-sub {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1.1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 12px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-teal {
  background: var(--teal);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25);
}

.btn-teal:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  border-radius: 9px;
}

/* Hero Section */
.hero {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

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

.hero-desc {
  color: var(--text-secondary);
  font-size: 1.08rem;
  margin-bottom: 1.75rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 2.25rem;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.stat-item strong {
  display: block;
  font-size: 1.6rem;
  color: var(--accent);
  line-height: 1.2;
}

.stat-item span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Dual Zone Portal Cards on Hero Right */
.portal-stack {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.portal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.22s ease, border-color 0.22s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  gap: 1.15rem;
  align-items: flex-start;
}

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

.portal-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.portal-icon.blue {
  background: var(--accent-soft);
  color: var(--accent);
}

.portal-icon.teal {
  background: var(--teal-soft);
  color: var(--teal);
}

.portal-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}

.portal-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.portal-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 2.25rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.section-title {
  font-size: clamp(1.55rem, 2.8vw, 2.1rem);
  line-height: 1.25;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.98rem;
  max-width: 650px;
}

/* App Studio (Teacher Tools) */
.app-tabs {
  display: inline-flex;
  background: var(--bg-secondary);
  padding: 0.35rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  gap: 0.35rem;
}

.app-tab-btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1.2rem;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.app-tab-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.25);
}

.app-workspace {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.app-workspace:fullscreen {
  padding: 3rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.app-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}

.app-panel {
  display: none;
}

.app-panel.active {
  display: block;
}

/* App 1: Student & Number Picker */
.picker-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: stretch;
}

.picker-stage {
  background: linear-gradient(145deg, var(--accent-soft), var(--teal-soft));
  border: 2px dashed var(--accent-border);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 340px;
}

.picker-status {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.picker-display {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 800;
  color: var(--accent);
  min-height: 1.3em;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  word-break: break-word;
  transition: transform 0.15s ease;
}

.picker-display.rolling {
  color: var(--teal);
  transform: scale(1.06);
}

.picker-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.picker-config {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  background: var(--bg-subtle);
  padding: 0.3rem;
  border-radius: 10px;
}

.mode-btn {
  border: none;
  background: transparent;
  padding: 0.5rem;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.mode-btn.active {
  background: var(--bg-secondary);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.input-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.range-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

input[type="number"],
input[type="text"],
select,
textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
}

textarea {
  resize: vertical;
  min-height: 135px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.history-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.chip {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* App 2: Classroom Timer */
.timer-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.timer-stage {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.timer-task-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.timer-digits {
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--text-primary);
  margin: 0.5rem 0 1.25rem;
}

.timer-digits.warning {
  color: var(--amber);
}

.timer-digits.finished {
  color: var(--danger);
  animation: pulse 0.9s infinite alternate;
}

@keyframes pulse {
  from { transform: scale(1); }
  to { transform: scale(1.06); }
}

.progress-track {
  width: 100%;
  height: 12px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  transition: width 0.4s linear;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

/* Materials Grid */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  align-items: center;
  justify-content: space-between;
}

.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cat-btn {
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.cat-btn.active,
.cat-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.search-box {
  min-width: 260px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.35rem;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.badge {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* About / Portfolio Section */
.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2rem;
}

.profile-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.avatar-circle {
  width: 84px;
  height: 84px;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeline-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.timeline-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}

.year-tag {
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--teal);
  background: var(--teal-soft);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

/* Responsive */
@media (max-width: 920px) {
  .hero-grid,
  .picker-layout,
  .timer-layout,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }
}


/* ============================================================================
   Course V30287 (สื่อดิจิทัล ม.5 - 20 สัปดาห์) & AI Log Builder Styles
   ============================================================================ */

.week-selector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.55rem;
  margin-bottom: 1.5rem;
}

.week-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem 0.5rem;
  text-align: center;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.18s ease;
  color: var(--text-primary);
}

.week-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.week-btn.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
}

.week-btn strong {
  display: block;
  font-size: 0.95rem;
  line-height: 1.2;
}

.week-btn span {
  font-size: 0.72rem;
  opacity: 0.85;
}

.course-detail-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 1.75rem;
  align-items: start;
}

.course-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.prompt-card {
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  margin-bottom: 1rem;
}

.prompt-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

.prompt-text {
  font-size: 0.93rem;
  color: var(--text-primary);
  white-space: pre-wrap;
  line-height: 1.55;
}

.pre-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  font-size: 0.88rem;
  white-space: pre-wrap;
  max-height: 320px;
  overflow-y: auto;
  color: var(--text-secondary);
  line-height: 1.6;
}

.filename-preview {
  background: var(--teal-soft);
  border: 1px dashed var(--teal);
  border-radius: 10px;
  padding: 0.65rem 0.95rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--teal);
}

.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text-primary);
  color: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all 0.22s ease;
}

.toast-msg.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .course-detail-grid {
    grid-template-columns: 1fr;
  }
}


/* Course Hero Banner Image */
.course-banner-wrap {
  margin-bottom: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--accent-border);
  box-shadow: var(--shadow-lg);
  background: var(--bg-secondary);
}

.course-banner-img {
  width: 100%;
  height: auto;
  display: block;
}

.profile-banner-thumb {
  width: 100%;
  height: 165px;
  object-fit: cover;
  object-position: right center;
  border-radius: 14px;
  margin-bottom: 1.15rem;
  border: 1px solid var(--border);
}