/* ==========================================================================
   Grade 8 Thai Poetry Learning Center - Ultra-Modern Premium Stylesheet
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&family=Prompt:wght@300;400;500;600;700&display=swap');

:root {
  /* Thai Cultural Palette */
  --bg-dark: #0B0F19;
  --bg-card: rgba(22, 30, 49, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --border-glow: rgba(245, 158, 11, 0.35);
  --border-light: rgba(255, 255, 255, 0.08);

  --accent-gold: #F59E0B;
  --accent-amber: #FCD34D;
  --accent-crimson: #E11D48;
  --accent-emerald: #10B981;
  --accent-cyan: #06B6D4;
  --accent-rose: #F43F5E;
  --accent-purple: #A855F7;

  --text-main: #F8FAFC;
  --text-muted: #94A3B8;

  /* Ultra-Modern Loopless Sans-Serif Thai Typography */
  --font-main: 'Prompt', 'Kanit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Prompt', 'Kanit', -apple-system, sans-serif;
  --font-poetic: 'Prompt', 'Kanit', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-gold: 0 0 25px rgba(245, 158, 11, 0.2);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(245, 158, 11, 0.1) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(225, 29, 72, 0.08) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(15, 23, 42, 0.95) 0px, var(--bg-dark) 100%);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(11, 15, 25, 0.8); }
::-webkit-scrollbar-thumb { background: rgba(245, 158, 11, 0.4); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-gold); }

/* Header */
.app-header {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 24px;
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon { font-size: 2rem; }
.logo-text h1 {
  font-family: var(--font-main);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent-amber);
  background: linear-gradient(135deg, #FDE047, #F59E0B);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.3px;
}
.logo-text span {
  font-family: var(--font-main);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.audio-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 6px 16px;
  border-radius: 20px;
  font-family: var(--font-main);
  font-size: 0.85rem;
  cursor: pointer;
}

/* Nav Tabs */
.main-nav {
  max-width: 1400px;
  margin: 20px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 12px;
  overflow-x: auto;
}

.nav-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  white-space: nowrap;
}

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

.nav-tab.active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(225, 29, 72, 0.15));
  border-color: var(--accent-gold);
  color: var(--accent-amber);
  box-shadow: var(--shadow-gold);
}

/* Main Container */
.main-container {
  max-width: 1400px;
  margin: 24px auto;
  padding: 0 24px 40px;
}

/* Rhyme Color Pair Legend Grid */
.rhyme-legend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.legend-card {
  background: rgba(15, 23, 42, 0.9);
  border: 2px solid;
  border-radius: var(--radius-md);
  padding: 16px;
}

.legend-card.color-pair-cyan { border-color: var(--accent-cyan); box-shadow: 0 0 10px rgba(6, 182, 212, 0.2); }
.legend-card.color-pair-emerald { border-color: var(--accent-emerald); box-shadow: 0 0 10px rgba(16, 185, 129, 0.2); }
.legend-card.color-pair-rose { border-color: var(--accent-rose); box-shadow: 0 0 10px rgba(244, 63, 94, 0.2); }

.legend-badge {
  font-family: var(--font-main);
  font-weight: bold;
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.color-pair-cyan .legend-badge { color: var(--accent-cyan); }
.color-pair-emerald .legend-badge { color: var(--accent-emerald); }
.color-pair-rose .legend-badge { color: var(--accent-rose); }

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

/* Lesson Cards */
.lesson-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}

.lesson-title {
  font-family: var(--font-main);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 12px;
}

/* Fill-in-the-Blanks Section */
.exercise-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.ex-header h2 {
  font-family: var(--font-main);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 6px;
}

.ex-nav-container {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
}

.ex-nav-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: #FFF;
  font-family: var(--font-main);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.ex-nav-btn.active {
  background: var(--accent-gold);
  color: #000;
  font-weight: bold;
}

.poem-line-editable, .poem-line-static {
  font-family: var(--font-body);
  font-size: 1.25rem;
  line-height: 2.2;
  margin-bottom: 12px;
  padding: 12px 18px;
  background: rgba(15, 23, 42, 0.7);
  border-radius: var(--radius-md);
}

.blank-input-badge {
  background: rgba(245, 158, 11, 0.2);
  border: 1px dashed var(--accent-gold);
  color: var(--accent-amber);
  padding: 4px 12px;
  border-radius: 6px;
  font-weight: bold;
  display: inline-block;
}

.blank-input-badge.correct { background: rgba(16, 185, 129, 0.2); border: 1px solid var(--accent-emerald); color: #A7F3D0; }
.blank-input-badge.wrong { background: rgba(225, 29, 72, 0.2); border: 1px solid var(--accent-crimson); color: #FECDD3; }

.blank-options-pop {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.blank-opt-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-light);
  color: #FFF;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
}
.blank-opt-btn:hover { background: rgba(245, 158, 11, 0.3); border-color: var(--accent-gold); }

/* Line Level Fill Exercises */
.poem-line-display {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.poem-line-display.is-blank-line {
  border: 2px dashed var(--accent-gold);
  background: rgba(245, 158, 11, 0.08);
}

.line-pos-tag {
  font-family: var(--font-main);
  font-size: 0.75rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  padding: 4px 8px;
  border-radius: 4px;
}

.line-opt-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: #FFF;
  font-family: var(--font-body);
  font-size: 1.1rem;
  width: 100%;
  margin-bottom: 10px;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
}

.line-opt-btn:hover {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--accent-gold);
}

.opt-num {
  font-family: var(--font-main);
  font-weight: bold;
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

/* Studio Layout & Meta Inputs */
.studio-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
}

@media (max-width: 1200px) {
  .studio-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .poem-meta-inputs-box { grid-template-columns: 1fr !important; }
}

.grid-studio-wrapper-two-stanzas {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.stanza-block-box {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.stanza-block-title {
  font-family: var(--font-main);
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--accent-amber);
  margin-bottom: 14px;
}

.pair-row-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 14px;
}

@media (max-width: 900px) {
  .pair-row-two-col { grid-template-columns: 1fr; }
}

.grid-line-col {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px;
}

.grid-line-label {
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.grid-slots-8-row {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 5px;
}

.slot-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 3 | 2 | 3 Golden Divider Lines */
.slot-item.divider-after-3,
.slot-item.divider-after-5 {
  margin-right: 6px;
  padding-right: 6px;
}

.slot-item.divider-after-3::after,
.slot-item.divider-after-5::after {
  content: '';
  position: absolute;
  right: -4px;
  top: 15%;
  height: 70%;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent-gold), transparent);
  box-shadow: 0 0 8px var(--accent-gold);
  border-radius: 2px;
}

.slot-num {
  font-family: var(--font-main);
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 2px;
  white-space: nowrap;
}

.grid-slot-input {
  width: 100%;
  background: rgba(0, 0, 0, 0.5);
  border: 2px solid var(--border-light);
  border-radius: 6px;
  padding: 6px 2px;
  color: #FFF;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  text-align: center;
  transition: var(--transition);
}

/* Color-Coded Borders for Rhyme Pairs */
.grid-slot-input.color-border-cyan {
  border-color: var(--accent-cyan) !important;
  background: rgba(6, 182, 212, 0.15) !important;
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.3);
}

.grid-slot-input.color-border-emerald {
  border-color: var(--accent-emerald) !important;
  background: rgba(16, 185, 129, 0.15) !important;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.3);
}

.grid-slot-input.color-border-rose {
  border-color: var(--accent-rose) !important;
  background: rgba(244, 63, 94, 0.15) !important;
  box-shadow: 0 0 8px rgba(244, 63, 94, 0.3);
}

.grid-slot-input.color-border-purple {
  border-color: var(--accent-purple) !important;
  background: rgba(168, 85, 247, 0.15) !important;
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.3);
}

.grid-slot-input.color-border-amber {
  border-color: var(--accent-gold) !important;
  background: rgba(245, 158, 11, 0.15) !important;
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.3);
}

.grid-slot-input:focus {
  outline: none;
  box-shadow: 0 0 12px #FFF;
}

/* Match Indicator Badge below slot */
.match-indicator-badge {
  font-family: var(--font-main);
  font-size: 0.58rem;
  font-weight: bold;
  margin-top: 3px;
  border-radius: 4px;
  padding: 1px 3px;
  white-space: nowrap;
}

.match-indicator-badge.matched {
  background: rgba(16, 185, 129, 0.25);
  color: #A7F3D0;
  border: 1px solid var(--accent-emerald);
}

.match-indicator-badge.waiting {
  background: rgba(245, 158, 11, 0.25);
  color: var(--accent-amber);
  border: 1px solid var(--accent-gold);
}

.primary-btn {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  border: none;
  color: #000;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

/* Rhyme Analysis Card */
.rhyme-analysis-card {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 0.9rem;
}

.detailed-report-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.report-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 10px;
}

.report-title {
  font-family: var(--font-main);
  font-weight: bold;
  font-size: 1rem;
  color: var(--accent-amber);
}

.report-stars {
  font-family: var(--font-main);
  font-size: 0.9rem;
  color: var(--accent-gold);
  margin-top: 4px;
}

.line-eval-box {
  background: rgba(0,0,0,0.3);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 10px 14px;
}

.eval-line-title {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9rem;
  color: #FFF;
  margin-bottom: 4px;
}

.eval-line-body {
  font-size: 0.85rem;
  color: #CBD5E1;
  line-height: 1.6;
}

.report-footer {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid var(--accent-emerald);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.88rem;
  color: #E2E8F0;
}

/* Feedback Cards */
.feedback-card {
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-top: 20px;
}
.feedback-card.success { background: rgba(16, 185, 129, 0.15); border: 1px solid var(--accent-emerald); }
.feedback-card.error { background: rgba(225, 29, 72, 0.15); border: 1px solid var(--accent-crimson); }
.feedback-head { font-family: var(--font-main); font-weight: bold; font-size: 1.1rem; margin-bottom: 6px; }