/* SuleimanIELTS - Minimalist, Distraction-Free Study Platform
   Tailored for Cambridge IELTS Academic Practice & Engnovate Study Companion
*/

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Light Theme */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-active: #e2e8f0;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-focus: #3b82f6;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-subtle: #eff6ff;
  --primary-border: #bfdbfe;

  --accent-green: #10b981;
  --accent-green-subtle: #ecfdf5;
  --accent-amber: #f59e0b;
  --accent-amber-subtle: #fffbeb;
  --accent-purple: #8b5cf6;
  --accent-purple-subtle: #f5f3ff;
  --accent-rose: #f43f5e;
  --accent-rose-subtle: #fff1f2;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1200px;
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1e293b;
  --bg-subtle: #1a2234;
  --bg-active: #243048;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --border-light: #243048;
  --border-medium: #334155;
  --border-focus: #60a5fa;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-subtle: rgba(59, 130, 246, 0.12);
  --primary-border: rgba(59, 130, 246, 0.3);

  --accent-green: #34d399;
  --accent-green-subtle: rgba(52, 211, 153, 0.12);
  --accent-amber: #fbbf24;
  --accent-amber-subtle: rgba(251, 191, 36, 0.12);
  --accent-purple: #a78bfa;
  --accent-purple-subtle: rgba(167, 139, 250, 0.12);
  --accent-rose: #fb7185;
  --accent-rose-subtle: rgba(251, 113, 133, 0.12);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: var(--transition);
}

/* Layout */
.app-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header & Glass Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

[data-theme="dark"] .site-header {
  background-color: rgba(9, 13, 22, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 0;
}

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

.brand-badge {
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  color: #ffffff;
  font-weight: 800;
  font-size: 0.875rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-sm);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  display: block;
}

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

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
}

.action-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.theme-toggle-btn {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border-radius: var(--radius-full);
}

.target-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--accent-green-subtle);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.nav-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: var(--transition);
}

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

.tab-btn.active {
  color: var(--primary);
  background-color: var(--primary-subtle);
  border: 1px solid var(--primary-border);
}

/* Main Content Views */
main {
  flex: 1;
  padding: 1.75rem 0 3.5rem;
}

.view-section {
  display: none;
  animation: fadeIn 0.25s ease forwards;
}

.view-section.active {
  display: block;
}

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

/* Banner & Quick Launch */
.hero-banner {
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-subtle));
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero-text h1 {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
}

.hero-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 600px;
}

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

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  text-decoration: none;
}

/* Grid Containers */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Card Component */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Cambridge Test Cards */
.test-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.test-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.module-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--primary-subtle);
  color: var(--primary);
}

.status-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
}

.status-in-progress {
  background: var(--accent-amber-subtle);
  color: var(--accent-amber);
}

.status-ready {
  background: var(--accent-green-subtle);
  color: var(--accent-green);
}

.status-completed {
  background: var(--accent-purple-subtle);
  color: var(--accent-purple);
}

.test-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.test-topic-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.test-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.btn-engnovate-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-engnovate-link:hover {
  background: var(--bg-active);
  text-decoration: none;
}

/* Speaking Hub Styles */
.speaking-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.speaking-header-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.speaking-tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.spk-part-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.spk-part-btn.active {
  background: var(--primary);
  color: #ffffff;
}

.qa-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.qa-question-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.qa-pill {
  background: var(--primary-subtle);
  color: var(--primary);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  margin-top: 0.15rem;
}

/* Model Answer Accordion */
.model-box {
  background: var(--bg-subtle);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.15rem;
  margin: 1rem 0;
}

.model-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.model-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.model-speech {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.65;
}

.translation-toggle-btn {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.5rem;
}

.translation-box {
  display: none;
  background: var(--bg-surface);
  border: 1px dashed var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-style: italic;
}

.translation-box.visible {
  display: block;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.vocab-chip {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.vocab-chip-az {
  color: var(--text-muted);
  font-weight: 400;
}

/* Part 2 Cue Card Interactive Suite */
.cue-card-container {
  background: var(--bg-surface);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.cue-card-header {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.cue-bullets {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cue-bullets li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.cue-bullets li::before {
  content: "•";
  position: absolute;
  left: 0.4rem;
  color: var(--primary);
  font-size: 1.25rem;
  line-height: 1;
}

/* Timer Widget */
.timer-widget {
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}

.timer-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timer-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.timer-display {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.timer-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.timer-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  color: var(--text-primary);
}

.timer-btn.btn-active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* Audio Recorder Widget */
.recorder-widget {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.rec-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--accent-rose);
  box-shadow: 0 2px 4px rgba(244, 63, 94, 0.25);
}

.rec-btn.recording {
  animation: pulse-red 1.5s infinite;
  background-color: #be123c;
}

@keyframes pulse-red {
  0% { box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(244, 63, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(244, 63, 94, 0); }
}

.audio-preview {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
}

audio {
  height: 38px;
  max-width: 320px;
}

/* Note Scratchpad */
.scratchpad {
  width: 100%;
  min-height: 90px;
  padding: 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  resize: vertical;
}

.scratchpad:focus {
  outline: 2px solid var(--border-focus);
}

/* Lexical Vault Styles */
.vault-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 240px;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.search-input:focus {
  outline: 2px solid var(--border-focus);
}

.filter-select {
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
}

.vocab-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.vocab-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vocab-phrase {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

.cefr-tag {
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--accent-purple-subtle);
  color: var(--accent-purple);
}

.vocab-meaning {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.vocab-example {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.25rem;
  border-left: 2px solid var(--border-medium);
  padding-left: 0.6rem;
}

/* Sidecar / Engnovate Companion Mode */
body.sidecar-mode {
  font-size: 14px;
}

body.sidecar-mode .site-header {
  padding: 0.4rem 0;
}

body.sidecar-mode .hero-banner {
  display: none;
}

body.sidecar-mode .app-container {
  max-width: 100%;
  padding: 0 0.75rem;
}

body.sidecar-mode .grid-2, body.sidecar-mode .grid-3 {
  grid-template-columns: 1fr;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-light);
  padding: 1.5rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-surface);
}