/* ==========================================================================
   KuisKu – Modern, Clean & High-Craft Product Design System
   No AI Slop: No rainbow gradients, no blurry glassmorphism, no neon glows.
   Inspired by Linear, Stripe, and modern Scandinavian software design.
   ========================================================================== */

:root {
  /* Core brand palette */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-active: #3730a3;
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;

  /* Surfaces & canvas */
  --bg-canvas: #f8fafc;
  --surface-card: #ffffff;
  --surface-subtle: #f1f5f9;
  --surface-hover: #f8fafc;

  /* Borders */
  --border-subtle: #f1f5f9;
  --border-default: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: #6366f1;

  /* Text hierarchy */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-disabled: #94a3b8;

  /* Semantic status colors */
  --success: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;

  --warning: #d97706;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --warning-text: #92400e;

  --danger: #e11d48;
  --danger-bg: #fff1f2;
  --danger-border: #fecdd3;
  --danger-text: #9f1239;

  /* Clean, realistic shadows (no colored neon blurs) */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.06), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  /* Radius tokens */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

/* ── Base Styles ── */
body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Disable floating ambient glowing blobs */
.ambient-glow,
.ambient-glow-1,
.ambient-glow-2 {
  display: none !important;
}

/* ── Clean Page View Transition ── */
.page-view {
  animation: cleanPageFade 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  z-index: 10;
}
.page-view.hidden {
  display: none !important;
}

@keyframes cleanPageFade {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Modern Solid Surfaces (Replaces blurry glassmorphism) ── */
.glass-panel {
  background: var(--surface-card);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-xl);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.glass-pill {
  background: var(--surface-card);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-xs);
  border-radius: var(--radius-lg);
  transition: all 0.15s ease;
}
.glass-pill:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

/* ── Quiz Option Buttons (Clean, High-Craft Selection) ── */
.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
  background: var(--surface-card);
  text-align: left;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  line-height: 1.5;
  box-shadow: var(--shadow-xs);
  position: relative;
}

.option-btn:hover:not(:disabled) {
  border-color: var(--border-strong);
  background: var(--surface-subtle);
  box-shadow: var(--shadow-sm);
}

.option-btn:active:not(:disabled) {
  transform: scale(0.995);
  background: #f1f5f9;
}

.option-btn:disabled {
  cursor: default;
}

/* Correct Answer State */
.option-btn.correct {
  border-color: var(--success) !important;
  background-color: var(--success-bg) !important;
  color: var(--success-text) !important;
  box-shadow: 0 0 0 1px var(--success) !important;
}

/* Wrong Answer State */
.option-btn.wrong {
  border-color: var(--danger) !important;
  background-color: var(--danger-bg) !important;
  color: var(--danger-text) !important;
  box-shadow: 0 0 0 1px var(--danger) !important;
}

/* Skipped / Inactive Answer State */
.option-btn.skipped {
  border-color: var(--border-subtle) !important;
  background-color: #f8fafc !important;
  color: var(--text-disabled) !important;
  opacity: 0.55;
}

/* ── Option Letter Badge (Clean, Square Rounded Badge) ── */
.option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: var(--radius-sm);
  background: var(--surface-subtle);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: all 0.15s ease;
  border: 1px solid var(--border-default);
}

.option-btn:hover:not(:disabled) .option-letter {
  background: var(--border-default);
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: none; /* No silly rotation */
}

.option-btn.correct .option-letter {
  background: var(--success);
  color: #ffffff;
  border-color: var(--success);
}

.option-btn.wrong .option-letter {
  background: var(--danger);
  color: #ffffff;
  border-color: var(--danger);
}

/* ── Flashcard 3D Card ── */
#fc-card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Library & Material Cards ── */
.material-card {
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.material-card:hover {
  border-color: var(--border-strong) !important;
  box-shadow: var(--shadow-sm);
  background-color: #ffffff;
}

/* ── Refined Status Badges ── */
.badge-easy {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}
.badge-medium {
  background: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-border);
}
.badge-hard {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-border);
}

/* ── Solid, Confident Buttons (No cheap rainbow gradients or neon glows) ── */
.btn-glow-primary,
.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
  border: 1px solid transparent;
}
.btn-glow-primary:hover,
.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-0.5px);
}
.btn-glow-primary:active,
.btn-primary:active {
  background-color: var(--primary-active);
  transform: translateY(0);
}

.btn-glow-share {
  background-color: #0f172a;
  color: #ffffff;
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
  border: 1px solid transparent;
}
.btn-glow-share:hover {
  background-color: #1e293b;
  box-shadow: var(--shadow-sm);
  transform: translateY(-0.5px);
}
.btn-glow-share:active {
  background-color: #020617;
  transform: translateY(0);
}

/* ── Drop Zone ── */
.dropzone-active {
  border-color: var(--primary) !important;
  background-color: var(--primary-50) !important;
}

/* ── Modals & Backdrop ── */
.modal-backdrop {
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

#modal-quit.open,
#modal-delete.open,
#modal-share.open,
#modal-customer-detail.open,
#modal-session-detail.open,
#modal-api-key-prompt.open,
#levelup-overlay.open {
  display: flex !important;
}

/* Clean modal card animation (no exaggerated bounce) */
.modal-card {
  animation: modalEnter 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalEnter {
  from {
    opacity: 0;
    transform: scale(0.97) translateY(4px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* ── Navigation Tabs ── */
.nav-btn {
  position: relative;
  transition: color 0.15s ease, background-color 0.15s ease;
  border-radius: var(--radius-md);
  font-weight: 500;
}
.nav-btn:hover {
  color: var(--text-primary) !important;
  background: var(--surface-subtle) !important;
}
.nav-btn.active {
  color: var(--text-primary) !important;
  background: #f1f5f9 !important;
  font-weight: 600;
}
.nav-btn.active::after {
  display: none !important; /* Remove floating bottom bar */
}

/* ── Minimal Clean Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* ── Confetti Canvas ── */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* ── Subtle Focus Rings ── */
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--border-focus) !important;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15) !important;
}

/* ── Resume Prose & Academic Typography (Rich Editorial Design) ── */
.resume-prose {
  color: #334155;
  font-size: 0.95rem;
  line-height: 1.8;
  letter-spacing: -0.01em;
}

/* Chapter Heading 1: Rich, non-flat chapter banner */
.resume-prose h1,
.resume-prose .resume-chapter-header {
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.025em;
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  padding: 0.875rem 1.25rem;
  background: linear-gradient(90deg, #f1f5f9 0%, #f8fafc 60%, rgba(255, 255, 255, 0.4) 100%);
  border-left: 5px solid #4f46e5;
  border-top: 1px solid #e2e8f0;
  border-right: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
  border-radius: 0.875rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  scroll-margin-top: 7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.resume-prose h1:first-child,
.resume-prose .resume-chapter-header:first-child {
  margin-top: 0.5rem;
}

/* Specific styling for Exam Key Takeaways (Poin Kritis Ujian) */
.resume-prose h1#sec-ujian,
.resume-prose .resume-chapter-header#sec-ujian {
  background: linear-gradient(90deg, #fef3c7 0%, #fffbeb 60%, rgba(255, 255, 255, 0.4) 100%) !important;
  border-left-color: #f59e0b !important;
  border-color: #fde68a !important;
  color: #92400e !important;
}

/* Subtopics Heading 2: Styled as distinct topic cards */
.resume-prose h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e293b;
  letter-spacing: -0.02em;
  margin-top: 2rem;
  margin-bottom: 0.875rem;
  padding: 0.625rem 1rem;
  background-color: #f8fafc;
  border-left: 3px solid #6366f1;
  border-radius: 0.625rem;
  border-top: 1px solid #f1f5f9;
  border-right: 1px solid #f1f5f9;
  border-bottom: 1px solid #f1f5f9;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.02);
  scroll-margin-top: 7rem;
}

/* Subheadings Heading 3 */
.resume-prose h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #334155;
  margin-top: 1.5rem;
  margin-bottom: 0.625rem;
  padding-left: 0.5rem;
  border-left: 2px solid #cbd5e1;
}

/* Paragraphs & Lead Notes */
.resume-prose p {
  margin-bottom: 0.875rem;
  color: #334155;
  line-height: 1.7;
  text-align: left;
}

.resume-prose p.resume-lead-note {
  background-color: #f8fafc;
  border-left: 3px solid #818cf8;
  padding: 0.625rem 0.875rem;
  border-radius: 0 0.5rem 0.5rem 0;
  font-size: 0.95em;
  color: #475569;
}

/* Lists: Modular Scannable Item Cards */
.resume-prose ul {
  list-style-type: none;
  padding-left: 0;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.resume-prose ul > li {
  position: relative;
  padding: 0.625rem 0.875rem 0.625rem 2rem;
  background-color: #fafbfc;
  border: 1px solid #f1f5f9;
  border-radius: 0.625rem;
  line-height: 1.65;
  color: #334155;
  font-size: 0.9375rem;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.resume-prose ul > li:hover {
  background-color: #f5f7ff;
  border-color: #e0e7ff;
  box-shadow: 0 1px 3px rgba(99, 102, 241, 0.05);
}

.resume-prose ul > li::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 1.05rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #6366f1;
}

.resume-prose ol {
  padding-left: 0;
  list-style-type: none;
  counter-reset: resume-ol-counter;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.resume-prose ol > li {
  position: relative;
  counter-increment: resume-ol-counter;
  padding: 0.625rem 0.875rem 0.625rem 2.25rem;
  background-color: #fafbfc;
  border: 1px solid #f1f5f9;
  border-radius: 0.625rem;
  line-height: 1.65;
  color: #334155;
  font-size: 0.9375rem;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.resume-prose ol > li:hover {
  background-color: #f5f7ff;
  border-color: #e0e7ff;
}

.resume-prose ol > li::before {
  content: counter(resume-ol-counter);
  position: absolute;
  left: 0.625rem;
  top: 0.65rem;
  width: 1.125rem;
  height: 1.125rem;
  background-color: #e0e7ff;
  color: #4338ca;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 800;
}

/* Keyword & Definition Badge Highlight for bold terms */
.resume-prose li strong:first-child {
  display: inline-block;
  color: #312e81;
  background-color: #eef2ff;
  border: 1px solid #e0e7ff;
  padding: 0.125rem 0.5rem;
  border-radius: 0.375rem;
  font-weight: 700;
  font-size: 0.9em;
  margin-right: 0.375rem;
  box-shadow: 0 1px 1px rgba(99, 102, 241, 0.05);
}

.resume-prose strong {
  color: #0f172a;
  font-weight: 700;
}

.resume-prose em {
  color: #475569;
  font-style: italic;
}

/* Blockquotes: Rich Callout Styling */
.resume-prose blockquote {
  border-left: 4px solid #6366f1;
  background-color: #f8fafc;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 0.875rem 0.875rem 0;
  border-top: 1px solid #f1f5f9;
  border-right: 1px solid #f1f5f9;
  border-bottom: 1px solid #f1f5f9;
  color: #475569;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

.resume-prose blockquote p:last-child {
  margin-bottom: 0;
}

/* Code & Formulas */
.resume-prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85em;
  background-color: #f1f5f9;
  border: 1px solid #e2e8f0;
  padding: 0.2em 0.45em;
  border-radius: 0.375rem;
  color: #4338ca;
  font-weight: 600;
}

.resume-prose hr {
  border: 0;
  border-top: 1px solid #e2e8f0;
  margin: 2.25rem 0;
}

/* Tables: Modern Card Table */
.resume-prose table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid #e2e8f0;
  border-radius: 0.875rem;
  overflow: hidden;
  margin: 1.75rem 0;
  font-size: 0.875rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.03);
}

.resume-prose th {
  background-color: #f8fafc;
  font-weight: 700;
  color: #0f172a;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e2e8f0;
  border-right: 1px solid #f1f5f9;
  text-align: left;
}

.resume-prose th:last-child {
  border-right: 0;
}

.resume-prose td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #f1f5f9;
  border-right: 1px solid #f8fafc;
  color: #334155;
  background-color: #ffffff;
}

.resume-prose td:last-child {
  border-right: 0;
}

.resume-prose tr:last-child td {
  border-bottom: 0;
}

.resume-prose tr:nth-child(even) td {
  background-color: #fafbfc;
}

/* ── Resume Font Sizing Toggles ── */
.resume-prose.font-size--1 {
  font-size: 0.875rem !important;
  line-height: 1.65 !important;
}
.resume-prose.font-size-0 {
  font-size: 0.95rem !important;
  line-height: 1.8 !important;
}
.resume-prose.font-size-1 {
  font-size: 1.0625rem !important;
  line-height: 1.9 !important;
}
.resume-prose.font-size-2 {
  font-size: 1.1875rem !important;
  line-height: 2 !important;
}

/* ── Eye-Care Warm Paper Mode ── */
#resume-content-wrapper.theme-warm {
  background-color: #fbf8f2 !important;
  border-color: #eedec8 !important;
}

#resume-content-wrapper.theme-warm .resume-cover-strip {
  border-bottom-color: #eedec8 !important;
}

#resume-content-wrapper.theme-warm .resume-prose {
  color: #382d27 !important;
}

#resume-content-wrapper.theme-warm .resume-prose h1,
#resume-content-wrapper.theme-warm .resume-prose .resume-chapter-header {
  background: linear-gradient(90deg, #f4ebe0 0%, #faf4ec 60%, rgba(251, 248, 242, 0.5) 100%) !important;
  border-color: #e5d3bd !important;
  color: #261c16 !important;
}

#resume-content-wrapper.theme-warm .resume-prose h2 {
  background-color: #f7efe4 !important;
  border-color: #e5d3bd !important;
  color: #261c16 !important;
}

#resume-content-wrapper.theme-warm .resume-prose p,
#resume-content-wrapper.theme-warm .resume-prose li {
  color: #382d27 !important;
}

#resume-content-wrapper.theme-warm .resume-prose li strong:first-child {
  background-color: #f2e6d6 !important;
  border-color: #e2d2bf !important;
  color: #5c3b1e !important;
}

#resume-content-wrapper.theme-warm .resume-prose ul > li,
#resume-content-wrapper.theme-warm .resume-prose ol > li {
  background-color: #f6eedf !important;
  border-color: #e8d9c5 !important;
  color: #382d27 !important;
}

#resume-content-wrapper.theme-warm .resume-prose ul > li:hover,
#resume-content-wrapper.theme-warm .resume-prose ol > li:hover {
  background-color: #f2e6d3 !important;
  border-color: #dfceb8 !important;
}

#resume-content-wrapper.theme-warm .resume-prose ol > li::before {
  background-color: #e8d9c5 !important;
  color: #5c3b1e !important;
}

#resume-content-wrapper.theme-warm .resume-prose p.resume-lead-note {
  background-color: #f6eedf !important;
  border-left-color: #c9a87d !important;
  color: #382d27 !important;
}

/* ── Smooth Scrolling for TOC ── */
html {
  scroll-behavior: smooth;
}

/* ── Mobile Bottom Navigation ── */
.mobile-nav-btn {
  color: #64748b;
  position: relative;
  transition: color 0.15s ease, transform 0.1s ease;
}
.mobile-nav-btn.active {
  color: #4f46e5 !important;
}
.mobile-nav-btn.active svg {
  stroke-width: 2.3;
}
.mobile-nav-btn.active span {
  font-weight: 700;
  color: #4f46e5 !important;
}
.mobile-nav-btn.active::after {
  content: '';
  position: absolute;
  top: 2px;
  width: 4px;
  height: 4px;
  border-radius: 9999px;
  background-color: #4f46e5;
}

/* ── No Scrollbar Helper ── */
.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.no-scrollbar::-webkit-scrollbar {
  display: none;
}

/* ── Mobile Viewport Optimizations (< 640px) ── */
@media (max-width: 639px) {
  /* Resume typography on small screens */
  .resume-prose h1 {
    font-size: 1.15rem;
    line-height: 1.4;
    padding-bottom: 0.4rem;
  }
  .resume-prose h2 {
    font-size: 1.025rem;
    line-height: 1.4;
    margin-top: 1.5rem;
  }
  .resume-prose h3 {
    font-size: 0.95rem;
    line-height: 1.35;
  }
  .resume-prose p,
  .resume-prose li {
    font-size: 0.85rem;
    line-height: 1.6;
  }
  .resume-prose ul,
  .resume-prose ol {
    padding-left: 0.25rem;
  }
  .resume-prose ul > li,
  .resume-prose ol > li {
    padding: 0.5rem 0.65rem;
    font-size: 0.85rem;
  }
  /* Prevent tables from overflowing phone screens */
  .resume-prose table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  /* Sticky quick-nav bar positioning on mobile */
  #resume-quick-nav {
    top: 4rem;
  }
}

/* Print optimizations for resume study guide */
@media print {
  nav,
  header,
  footer,
  #streak-badge,
  .nav-btn,
  .mobile-nav-btn,
  #mobile-bottom-nav,
  #btn-copy-resume,
  #btn-resume-start-quiz,
  button {
    display: none !important;
  }
  
  body, #main-content {
    background: #ffffff !important;
    padding: 0 !important;
  }

  #page-resume {
    display: block !important;
  }

  .glass-panel {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
  }
}