:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #E85D26; /* Orange accentuate */
  --bg-app: #F8FAFC;
  --surface: #FFFFFF;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 12px;
  --font-main: 'Outfit', sans-serif;
  --font-serif: 'DM Sans', sans-serif;
  
  /* Plan Colors */
  --color-indiv: #E85D26;
  --color-group: #2563EB;
  --color-school: #059669;

  /* Theme Toggle */
  --theme-toggle-bg: #f1f5f9;
  --theme-toggle-shadow: rgba(0,0,0,0.1);
  --form-bg: #f9f9f9;
  --modal-bg: rgba(0,0,0,0.8);
}

/* Dark Theme */
body.dark-theme {
  --bg-app: #0f172a;
  --surface: #1e293b;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  --theme-toggle-bg: #334155;
  --theme-toggle-shadow: rgba(0,0,0,0.3);
  --form-bg: #0f172a;
  --modal-bg: rgba(0,0,0,0.9);
}

body.dark-theme .app-header { background: var(--surface); border-color: var(--border); }
body.dark-theme .form-panel { background: var(--surface); }
body.dark-theme .output-panel { background: var(--surface); }
body.dark-theme .output-tabs { background: var(--form-bg); border-color: var(--border); }
body.dark-theme select, body.dark-theme input, body.dark-theme textarea { background: var(--bg-app); color: var(--text-main); border-color: var(--border); }
body.dark-theme .tab-btn { color: var(--text-muted); }
body.dark-theme .tab-btn.active { color: var(--primary); }
body.dark-theme .paper-preview-box { color: var(--text-main); }
body.dark-theme .paper-header { border-color: var(--text-muted); }
body.dark-theme .paper-section-title { color: var(--text-main); }
body.dark-theme .export-bar { background: var(--form-bg); }
body.dark-theme .export-btn { background: var(--surface); border-color: var(--border); color: var(--text-main); }
body.dark-theme .answer-key-bar { background: #1e3a5f; border-color: #2563EB55; }
body.dark-theme .ak-bar-text strong { color: var(--text-main); }
body.dark-theme .ak-bar-text span { color: var(--text-muted); }
body.dark-theme .demo-container { background: var(--surface); border-color: var(--border); }
body.dark-theme .unlock-overlay-tip { background: rgba(15, 23, 42, 0.9); border-color: var(--border); }
body.dark-theme .tip-text span { color: var(--text-muted); }
body.dark-theme .pricing-header .toggle-switch-group { background: var(--form-bg); }
body.dark-theme .plan-options-box { background: var(--surface); border-color: var(--border); }
body.dark-theme .option-card { background: var(--bg-app); border-color: var(--border); color: var(--text-main); }
body.dark-theme .plan-breakdown { background: var(--form-bg); color: var(--text-main); }
body.dark-theme .plan-action-preview { background: var(--surface); border-color: var(--border); color: var(--text-main); }
body.dark-theme .comparison-table-box { border-color: var(--border); }
body.dark-theme .comparison-table-head { background: var(--form-bg); color: var(--text-main); }
body.dark-theme .comparison-table { color: var(--text-main); }
body.dark-theme .comparison-table th { background: var(--form-bg); color: var(--text-main); border-color: var(--border); }
body.dark-theme .comparison-table td { border-color: var(--border); }
body.dark-theme .lang-selector { background: var(--form-bg); }
body.dark-theme .lang-btn { color: var(--text-muted); }
body.dark-theme .lang-btn.active { background: var(--surface); color: var(--primary); }
body.dark-theme .auth-btn-signin { background: var(--surface); color: var(--primary); border-color: var(--primary); }
body.dark-theme .auth-btn-signup { background: var(--primary); color: #fff; }
body.dark-theme .mini-dashboard { background: var(--surface); }
body.dark-theme .md-top { background: var(--surface); border-color: var(--border); }
body.dark-theme .md-title { color: var(--text-main); }
body.dark-theme .md-close { background: var(--form-bg); color: var(--text-muted); }
body.dark-theme .md-user-row { border-color: var(--border); }
body.dark-theme .md-user-name { color: var(--text-main); }
body.dark-theme .md-user-email { color: var(--text-muted); }
body.dark-theme .md-history-item { background: var(--form-bg); border-color: var(--border); }
body.dark-theme .md-history-empty { color: var(--text-muted); }
body.dark-theme .md-section-title { color: var(--text-muted); }
body.dark-theme .mini-dashboard-btn { color: var(--text-muted); }
body.dark-theme .mini-dashboard-btn:hover { background: var(--border); color: var(--primary); }
body.dark-theme .signout-btn { color: var(--text-muted); border-color: var(--border); }
body.dark-theme .signout-btn:hover { background: var(--form-bg); }
body.dark-theme .user-name { color: var(--text-main); }
body.dark-theme .output-placeholder, body.dark-theme .output-loading { color: var(--text-muted); }
body.dark-theme .chapter-container-scroll { background: var(--bg-app); border-color: var(--border); }
body.dark-theme .chapter-item { color: var(--text-main); }
body.dark-theme .chapter-placeholder { color: var(--text-muted); }
body.dark-theme .paper-save-warning { background: #422006; border-color: #a16207; }
body.dark-theme .paper-save-warning .warning-text { color: #fde68a; }
body.dark-theme .paper-save-warning .warning-text strong { color: #fbbf24; }
body.dark-theme .paper-save-warning .warning-close { color: #fbbf24; }
body.dark-theme .plan-trust-badges { color: var(--text-muted); }
body.dark-theme .view-pricing-btn { background: linear-gradient(135deg, #E85D26, #FF7A45); }
body.dark-theme .pay-modal-box { background: var(--surface); }
body.dark-theme .auth-modal-box { background: var(--surface); }
body.dark-theme .auth-tabs { background: var(--form-bg); }
body.dark-theme .auth-tab-btn { color: var(--text-muted); }
body.dark-theme .auth-tab-btn.active { background: var(--surface); color: var(--primary); }
body.dark-theme .auth-form-title { color: var(--text-main); }
body.dark-theme .auth-field label { color: var(--text-muted); }
body.dark-theme .auth-field input { background: var(--bg-app); color: var(--text-main); border-color: var(--border); }
body.dark-theme .auth-divider { color: var(--text-muted); }
body.dark-theme .auth-divider::before, body.dark-theme .auth-divider::after { background: var(--border); }
body.dark-theme .auth-switch-text { color: var(--text-muted); }
body.dark-theme .auth-switch-text a { color: var(--primary); }
body.dark-theme .auth-error { color: #f87171; }
body.dark-theme .auth-success { color: #4ade80; }
body.dark-theme .google-auth-btn { background: var(--form-bg); border-color: var(--border); color: var(--text-main); }
body.dark-theme .pay-step-title { color: var(--text-main); }
body.dark-theme .pay-step-sub { color: var(--text-muted); }
body.dark-theme .pay-badge-no { background: var(--form-bg); color: var(--text-muted); }
body.dark-theme .pay-breakdown { background: var(--form-bg); color: var(--text-main); }
body.dark-theme .pay-method-option { border-color: var(--border); color: var(--text-main); }
body.dark-theme .pay-method-option.selected { background: var(--primary) + '10'; }
body.dark-theme .pay-processing h3 { color: var(--text-main); }
body.dark-theme .pay-processing p { color: var(--text-muted); }
body.dark-theme .pay-done h3 { color: var(--text-main); }
body.dark-theme .pay-done p { color: var(--text-muted); }
body.dark-theme .md-plan-card { background: linear-gradient(135deg, #1e3a5f, #1e293b); border-color: #2563EB55; }
body.dark-theme .md-plan-top { color: var(--text-main); }
body.dark-theme .md-plan-name { color: var(--text-main); }
body.dark-theme .md-plan-sub { color: var(--text-muted); }
body.dark-theme .md-usage-bar-track { background: var(--border); }
body.dark-theme .md-usage-bar-label { color: var(--text-muted); }
body.dark-theme .md-stat-box { border-color: var(--border); }
body.dark-theme .md-stat-val { color: var(--text-main); }
body.dark-theme .md-stat-lbl { color: var(--text-muted); }
body.dark-theme .md-cta-btn { background: var(--primary); color: #fff; }
body.dark-theme .md-hi-subject { color: var(--text-main); }
body.dark-theme .md-hi-meta { color: var(--text-muted); }

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-main);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 5%;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo-container { display: flex; align-items: center; gap: 12px; }
.app-logo { height: 40px; width: 40px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; }
.brand-main { font-weight: 800; font-size: 1.25rem; color: var(--primary); line-height: 1.2; }
.brand-sub { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

.header-right { display: flex; align-items: center; gap: 16px; }
.theme-toggle-btn {
  display: flex; align-items: center; justify-content: center;
  background: var(--theme-toggle-bg); border: none; padding: 6px 10px;
  border-radius: 8px; cursor: pointer; font-size: 1.2rem;
  transition: all 0.3s; box-shadow: 0 2px 4px var(--theme-toggle-shadow);
}
.theme-toggle-btn:hover { transform: scale(1.1); }
.theme-icon { display: block; }

.lang-selector { display: flex; gap: 4px; padding: 4px; background: #f1f5f9; border-radius: 8px; }
.lang-btn {
  border: none; background: transparent; padding: 6px 12px; border-radius: 6px;
  font-weight: 600; cursor: pointer; color: var(--text-muted); font-size: 0.8rem;
}
.lang-btn.active { background: #fff; color: var(--primary); box-shadow: var(--shadow); }

/* Auth Area */
.auth-area { display: flex; align-items: center; gap: 8px; }
#authButtonsGroup { display: flex; gap: 8px; }
.auth-btn-signin {
  padding: 8px 20px; border-radius: 8px;
  border: 1.5px solid var(--primary); background: #fff;
  font-weight: 700; font-size: 0.85rem; cursor: pointer;
  color: var(--primary); transition: all 0.2s;
}
.auth-btn-signin:hover { background: var(--primary); color: #fff; }
.auth-btn-signup {
  padding: 8px 20px; border-radius: 8px;
  border: none; background: var(--primary);
  font-weight: 700; font-size: 0.85rem; cursor: pointer;
  color: #fff; transition: all 0.2s;
}
.auth-btn-signup:hover { background: var(--primary-hover); opacity: 0.9; }
.google-signin-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 8px;
  border: 1px solid var(--border); background: #fff;
  font-weight: 600; font-size: 0.85rem; cursor: pointer;
  color: #1e293b; transition: box-shadow 0.2s;
}
.google-signin-btn:hover { box-shadow: var(--shadow-lg); }
.user-panel {
  display: flex; align-items: center; gap: 10px;
}
.credits-badge {
  padding: 4px 10px; border-radius: 20px;
  font-size: 0.78rem; font-weight: 700; color: #fff;
  background: #94a3b8;
}
.user-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--border);
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.85rem; overflow: hidden;
}
.user-avatar-btn {
  background: none; border: none; padding: 0; cursor: pointer;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
}
.user-avatar-btn:hover .user-avatar { border-color: var(--primary); }
.user-avatar-btn, .user-avatar-btn div {
  pointer-events: none;
}
.mini-dashboard-btn {
  background: none; border: none; padding: 4px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); border-radius: 6px; transition: all 0.2s;
}
.mini-dashboard-btn:hover { color: var(--primary); background: #f1f5f9; }
.user-name { font-size: 0.88rem; font-weight: 600; color: #1e293b; }
.signout-btn {
  padding: 5px 12px; border-radius: 6px; border: 1px solid var(--border);
  background: transparent; font-size: 0.78rem; font-weight: 600;
  cursor: pointer; color: var(--text-muted);
}
.signout-btn:hover { background: #f1f5f9; }

/* ── Mini Dashboard ── */
.dashboard-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.35);
  z-index: 200; backdrop-filter: blur(2px);
}
.dashboard-overlay.open { display: block; }

/* ── Auth Modal ── */
.auth-modal-box {
  background: #fff; width: 100%; max-width: 440px; border-radius: 20px; padding: 30px; position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}
.auth-tabs { display: flex; gap: 0; margin-bottom: 24px; background: #f1f5f9; border-radius: 12px; padding: 4px; }
.auth-tab-btn {
  flex: 1; padding: 12px; border: none; background: transparent; border-radius: 10px;
  font-weight: 700; font-size: 0.9rem; cursor: pointer; color: var(--text-muted); transition: all 0.2s;
}
.auth-tab-btn.active { background: #fff; color: var(--primary); box-shadow: var(--shadow); }

.auth-form-panel { display: none; }
.auth-form-panel.active { display: block; animation: fadeIn 0.3s ease; }

.auth-form-title { font-size: 1.3rem; font-weight: 800; color: #0f172a; margin-bottom: 20px; text-align: center; }

.auth-field { margin-bottom: 18px; }
.auth-field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: #475569; }
.auth-field input {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 0.95rem; transition: border-color 0.2s;
}
.auth-field input:focus { outline: none; border-color: var(--primary); }

.auth-password-wrap { position: relative; }
.auth-toggle-pw {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: none; border: none; font-size: 0.8rem; font-weight: 600;
  color: var(--primary); cursor: pointer;
}

.auth-error { color: #dc2626; font-size: 0.85rem; margin-bottom: 12px; text-align: center; min-height: 20px; }
.auth-success { color: #059669; font-size: 0.85rem; margin-bottom: 12px; text-align: center; min-height: 20px; }

.auth-submit-btn {
  width: 100%; padding: 14px; background: var(--primary); color: #fff; border: none;
  border-radius: 10px; font-size: 1rem; font-weight: 700; cursor: pointer; margin-top: 8px;
  transition: background 0.2s;
}
.auth-submit-btn:hover { background: var(--primary-hover); }

.auth-divider { text-align: center; margin: 18px 0; font-size: 0.85rem; color: #94a3b8; position: relative; }
.auth-divider::before, .auth-divider::after {
  content: ''; position: absolute; top: 50%; width: 40%; height: 1px; background: #e2e8f0;
}
.auth-divider::before { left: 0; }
.auth-divider::after { right: 0; }

.google-auth-btn {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px; border: 1.5px solid var(--border); border-radius: 10px;
  background: #fff; font-weight: 700; font-size: 0.9rem; cursor: pointer; color: #1e293b;
  transition: all 0.2s;
}
.google-auth-btn:hover { border-color: var(--primary); background: #f8fafc; }

.auth-switch-text { text-align: center; margin-top: 18px; font-size: 0.85rem; color: #64748b; }
.auth-switch-text a { color: var(--primary); font-weight: 700; text-decoration: none; }
.auth-switch-text a:hover { text-decoration: underline; }

.mini-dashboard {
  position: fixed; top: 0; right: -420px; width: 380px; height: 100vh;
  background: #fff; z-index: 201; box-shadow: -4px 0 30px rgba(0,0,0,0.15);
  display: flex; flex-direction: column; gap: 0;
  transition: right 0.3s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto;
}
.mini-dashboard.open { right: 0; }

.md-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 16px; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0;
  background: #fff; z-index: 1;
}
.md-title { font-size: 1.05rem; font-weight: 800; color: #0f172a; margin: 0; }
.md-close {
  background: #f1f5f9; border: none; width: 30px; height: 30px; border-radius: 50%;
  cursor: pointer; font-size: 0.85rem; color: #64748b;
}
.md-close:hover { background: #e2e8f0; }

.md-user-row {
  display: flex; align-items: center; gap: 12px; padding: 16px 20px;
  border-bottom: 1px solid #f1f5f9;
}
.md-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--border);
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.1rem; overflow: hidden;
}
.md-user-name  { font-weight: 700; font-size: 0.95rem; color: #0f172a; }
.md-user-email { font-size: 0.78rem; color: #64748b; }

.md-plan-card {
  margin: 16px; padding: 16px; border-radius: 12px;
  background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
  border: 1px solid #bae6fd;
}
.md-plan-top { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.md-plan-icon { font-size: 1.6rem; }
.md-plan-name { font-weight: 800; font-size: 0.95rem; color: #0f172a; }
.md-plan-sub  { font-size: 0.75rem; color: #475569; margin-top: 1px; }
.md-plan-badge {
  margin-left: auto; padding: 3px 10px; border-radius: 20px;
  font-size: 0.72rem; font-weight: 800; color: #fff; background: #f59e0b;
  letter-spacing: 0.5px;
}

.md-usage-bar-wrap { display: flex; align-items: center; gap: 10px; }
.md-usage-bar-track {
  flex: 1; height: 7px; background: rgba(0,0,0,0.08); border-radius: 10px; overflow: hidden;
}
.md-usage-bar-fill { height: 100%; border-radius: 10px; transition: width 0.6s ease; background: #2563EB; }
.md-usage-bar-label { font-size: 0.75rem; font-weight: 600; color: #475569; white-space: nowrap; }

.md-stats-row {
  display: flex; gap: 0; margin: 0 16px 16px;
  border: 1px solid #e2e8f0; border-radius: 10px; overflow: hidden;
}
.md-stat-box {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  padding: 14px 8px; gap: 3px; border-right: 1px solid #e2e8f0;
}
.md-stat-box:last-child { border-right: none; }
.md-stat-val { font-size: 1.4rem; font-weight: 800; color: #0f172a; }
.md-stat-lbl { font-size: 0.72rem; color: #94a3b8; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }

.md-history-section { padding: 0 16px 16px; flex: 1; }
.md-section-title { font-size: 0.8rem; font-weight: 700; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 10px; }
.md-history-list { display: flex; flex-direction: column; gap: 8px; }
.md-history-empty { font-size: 0.85rem; color: #94a3b8; text-align: center; padding: 20px 0; }
.md-history-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; background: #f8fafc; border-radius: 8px;
  border: 1px solid #f1f5f9;
}
.md-hi-dot {
  width: 8px; height: 8px; border-radius: 50%; background: #2563EB;
  flex-shrink: 0;
}
.md-hi-info { display: flex; flex-direction: column; gap: 2px; }
.md-hi-subject { font-size: 0.85rem; font-weight: 600; color: #1e293b; }
.md-hi-meta    { font-size: 0.75rem; color: #94a3b8; }

.md-cta-btn {
  margin: 0 16px 20px; padding: 12px; border-radius: 10px; border: none;
  background: var(--primary); color: #fff; font-weight: 700; font-size: 0.9rem;
  cursor: pointer; transition: opacity 0.2s;
}
.md-cta-btn:hover { opacity: 0.88; }

/* Layout */
.main-container { max-width: 1400px; margin: 30px auto; padding: 0 20px; }
.generator-layout { display: grid; grid-template-columns: 380px 1fr; gap: 30px; align-items: start; }

/* Form Panel */
.form-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 2px solid #f1f5f9; }

.form-group { margin-bottom: 20px; }
.field-label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; color: var(--text-muted); }
select, input[type="text"], input[type="number"], textarea {
  width: 100%; padding: 10px 12px; border: 1.5px solid var(--border); border-radius: 8px;
  font-family: inherit; font-size: 0.95rem; transition: border-color 0.2s;
}
select:focus, input:focus, textarea:focus { outline: none; border-color: var(--primary); }

.form-row { display: flex; gap: 12px; }
.flex-1 { flex: 1; }

.chapter-container-scroll {
  max-height: 180px; overflow-y: auto; border: 1.5px solid var(--border); 
  border-radius: 8px; padding: 12px; background: #f9f9f9;
}
.chapter-placeholder { font-size: 0.85rem; color: #999; font-style: italic; text-align: center; padding-top: 10px; }
.chapter-item { display: flex; align-items: start; gap: 10px; padding: 4px 0; font-size: 0.88rem; cursor: pointer; }
.chapter-item input { margin-top: 4px; }

.difficulty-grid, .qtype-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
.diff-option, .qtype-option {
  display: flex; align-items: center; justify-content: center; height: 38px;
  border: 1.5px solid var(--border); border-radius: 8px; cursor: pointer; position: relative;
  font-size: 0.85rem; font-weight: 600; color: var(--text-muted); transition: 0.2s;
}
.diff-option input, .qtype-option input { position: absolute; opacity: 0; }
.diff-option:has(input:checked), .qtype-option:has(input:checked) {
  background: var(--primary); color: #fff; border-color: var(--primary);
}

.generate-btn {
  width: 100%; padding: 14px; background: var(--primary); color: #fff; border: none;
  border-radius: 8px; font-weight: 700; font-size: 1rem; cursor: pointer;
  margin-top: 10px; transition: transform 0.2s, background 0.2s;
}
.generate-btn:hover { background: var(--primary-hover); transform: translateY(-2px); }
.api-warning { font-size: 0.75rem; color: #dc2626; margin-top: 10px; text-align: center; }

/* Output Panel */
.output-panel {
  background: var(--surface); border: 1px solid var(--border); 
  border-radius: var(--radius); box-shadow: var(--shadow); position: relative;
  min-height: 600px; display: flex; flex-direction: column;
}

.output-placeholder, .output-loading {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; text-align: center;
}
.placeholder-icon { font-size: 4rem; opacity: 0.1; margin-bottom: 20px; }
.view-pricing-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; background: linear-gradient(135deg, #E85D26, #FF7A45);
  color: #fff; border: none; border-radius: 10px; font-weight: 700; font-size: 0.95rem;
  cursor: pointer; transition: transform 0.2s, box-shadow 0.2s;
}
.view-pricing-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(232,93,38,0.4); }
.loading-spinner {
  width: 50px; height: 50px; border: 5px solid #f1f5f9; border-top-color: var(--primary);
  border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.output-tabs {
  display: flex; border-bottom: 1px solid var(--border); background: #f8fafc;
  border-radius: var(--radius) var(--radius) 0 0;
}
.tab-btn {
  flex: 1; padding: 14px; border: none; background: transparent; cursor: pointer;
  font-weight: 700; color: var(--text-muted); transition: 0.2s; position: relative;
}
.tab-btn.active { color: var(--primary); }
.tab-btn.active::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px; background: var(--primary);
}

.tab-view { flex: 1; padding: 24px; position: relative; display: flex; flex-direction: column; }
.hidden { display: none !important; }

/* Preview */
.export-bar {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; background: #f1f5f9;
  border-radius: 10px; margin-bottom: 20px; flex-wrap: wrap;
}
.export-label { font-size: 0.75rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; }
.export-btn {
  display: flex; align-items: center; gap: 6px; padding: 6px 12px; background: #fff;
  border: 1px solid var(--border); border-radius: 6px; font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: 0.2s;
}
.export-btn:hover { background: #f8fafc; border-color: var(--primary); color: var(--primary); }
.regen-btn { margin-left: auto; background: var(--primary); color: #fff; border: none; }
.regen-btn:hover { background: var(--primary-hover); color: #fff; }

.answer-key-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: #f0f9ff; border: 1px solid #bae6fd; border-radius: 10px;
  padding: 14px 18px; margin-bottom: 12px;
}
.ak-bar-left { display: flex; align-items: center; gap: 12px; }
.ak-bar-icon { font-size: 1.6rem; }
.ak-bar-text { display: flex; flex-direction: column; gap: 2px; }
.ak-bar-text strong { font-size: 0.95rem; color: #0f172a; }
.ak-bar-text span { font-size: 0.8rem; color: #475569; }
.ak-bar-btn {
  white-space: nowrap; padding: 10px 18px; border-radius: 8px; border: none;
  color: #fff; font-weight: 700; font-size: 0.88rem; cursor: pointer;
  background: #2563EB; transition: opacity 0.2s;
}
.ak-bar-btn:hover { opacity: 0.88; }

.demo-view-container { position: relative; flex: 1; }
.demo-container {
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
  min-height: 400px; padding: 40px; position: relative; overflow: hidden;
}

.watermark-overlay {
  position: absolute; inset: 0; pointer-events: none; z-index: 10;
}
.watermark-text {
  position: absolute; font-size: 3rem; font-weight: 900; color: rgba(220,38,38,0.12);
  transform: rotate(-35deg); white-space: nowrap; user-select: none;
}

.blurred-text { filter: blur(5px); opacity: 0.6; user-select: none; }

.unlock-overlay-tip {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  width: 90%; background: rgba(0, 0, 0, 0.85); backdrop-filter: blur(8px);
  color: #fff; padding: 20px; border-radius: 16px; z-index: 20; border: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--shadow-lg); animation: slideUp 0.5s ease-out;
}
@keyframes slideUp { from { transform: translate(-50%, 50px); opacity: 0; } to { transform: translate(-50%, 0); opacity: 1; } }

.tip-content { display: flex; align-items: center; gap: 15px; }
.tip-icon { font-size: 1.5rem; }
.tip-text { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.tip-text strong { font-size: 1rem; }
.tip-text span { font-size: 0.8rem; color: #ccc; }
.btn-unlock-cta {
  background: var(--primary); color: #fff; border: none; padding: 10px 18px; 
  border-radius: 10px; font-weight: 700; cursor: pointer; font-size: 0.9rem;
}

/* Paper Styles */
.paper-preview-box { font-family: var(--font-serif); }
.paper-header { text-align: center; border-bottom: 2px solid #334155; padding-bottom: 15px; margin-bottom: 20px; }
.paper-school-name { font-size: 1.5rem; font-weight: 800; color: #1e293b; }
.paper-exam-title { font-size: 1.1rem; font-weight: 700; margin: 4px 0; }
.paper-meta { display: flex; justify-content: center; gap: 20px; font-size: 0.85rem; font-weight: 600; color: #475569; }

.paper-section { margin-bottom: 24px; }
.paper-save-warning {
  display: flex; align-items: center; gap: 10px;
  background: #fef3c7; border: 1px solid #fbbf24; border-radius: 8px;
  padding: 10px 14px; margin-top: 10px; animation: slideDown 0.3s ease;
}
.paper-save-warning .warning-icon { font-size: 1.2rem; }
.paper-save-warning .warning-text { flex: 1; font-size: 0.85rem; color: #92400e; }
.paper-save-warning .warning-text strong { color: #b45309; }
.paper-save-warning .warning-close {
  background: none; border: none; font-size: 1rem; cursor: pointer; color: #92400e; opacity: 0.6;
}
.paper-save-warning .warning-close:hover { opacity: 1; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.paper-section-title { font-size: 1rem; font-weight: 800; color: #1e293b; margin-bottom: 12px; border-bottom: 1px solid #e2e8f0; padding-bottom: 4px; }
.question-item { margin-bottom: 12px; font-size: 0.95rem; }
.qnum { font-weight: 700; width: 30px; display: inline-block; }
.marks { float: right; font-size: 0.75rem; color: #64748b; font-weight: 600; }
.mcq-options { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 20px; margin: 8px 0 0 35px; }
.opt { font-size: 0.88rem; }

/* Pricing */
.pricing-header { margin-bottom: 24px; }
.pricing-back-btn {
  background: none; border: none; font-size: 0.9rem; font-weight: 600; color: var(--text-muted);
  cursor: pointer; padding: 6px 0; margin-bottom: 10px; display: flex; align-items: center; gap: 4px;
}
.pricing-back-btn:hover { color: var(--primary); }
.plan-type-tabs { display: flex; gap: 10px; margin-bottom: 20px; }
.pt-tab {
  flex: 1; padding: 10px; border: 1.5px solid var(--border); border-radius: 10px;
  background: #fff; cursor: pointer; font-weight: 700; color: var(--text-muted); transition: 0.2s;
}
.pt-tab.active { box-shadow: var(--shadow); }

.toggle-switch-group {
  display: flex; padding: 4px; background: #f1f5f9; border-radius: 10px; gap: 4px;
}
.pricing-flow-copy {
  font-size: 0.84rem;
  color: #475569;
  line-height: 1.5;
  padding: 8px 10px;
}
.pricing-flow-copy span {
  display: block;
  margin-top: 4px;
}
.toggle-btn {
  flex: 1; padding: 10px; border: none; background: transparent; border-radius: 8px;
  font-size: 0.85rem; font-weight: 700; cursor: pointer; color: var(--text-muted);
}
.toggle-btn.active-q { background: var(--color-indiv); color: #fff; }
.toggle-btn.active-qa { background: var(--color-school); color: #fff; }

.plan-options-box {
  background: #fff; border: 2px solid var(--border); border-radius: 16px; padding: 24px;
  margin-bottom: 24px; transition: 0.3s;
}
.plan-options-header { display: flex; gap: 15px; margin-bottom: 20px; align-items: center; }
.plan-icon-lg { font-size: 2.5rem; background: #f8fafc; padding: 10px; border-radius: 12px; }
.plan-hd-name { font-size: 1.15rem; font-weight: 800; color: #0f172a; }
.plan-hd-tagline { font-size: 0.85rem; color: var(--text-muted); }

.options-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-bottom: 20px; }
.option-card {
  padding: 15px; border: 1.5px solid var(--border); border-radius: 12px; cursor: pointer; 
  text-align: center; position: relative; transition: 0.2s;
}
.option-card-tag {
  position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
  background: var(--primary); color: #fff; font-size: 0.65rem; font-weight: 800;
  padding: 3px 10px; border-radius: 20px; text-transform: uppercase;
}
.option-card-label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }
.option-card-price { font-size: 1.25rem; font-weight: 800; margin: 4px 0; }
.option-card-sub { font-size: 0.7rem; color: var(--text-muted); }

.plan-breakdown { font-size: 0.8rem; padding: 12px; background: #f8fafc; border-radius: 10px; margin-bottom: 20px; display: flex; flex-direction: column; gap: 4px; }
.plan-actions { display: flex; gap: 10px; }
.plan-action-preview { flex: 0.4; padding: 14px; border: 1.5px solid var(--border); border-radius: 10px; background: #fff; font-weight: 700; cursor: pointer; }
.plan-action-pay { flex: 0.6; padding: 14px; border: none; border-radius: 10px; color: #fff; font-weight: 800; cursor: pointer; }
.plan-action-pay:disabled { cursor: not-allowed; box-shadow: none; }

.plan-trust-badges { display: flex; gap: 15px; margin-top: 15px; justify-content: center; font-size: 0.75rem; font-weight: 600; color: #64748b; }

.comparison-table-box { border: 1.5px solid var(--border); border-radius: 12px; overflow: hidden; }
.comparison-table-head { background: #f8fafc; padding: 10px; text-align: center; font-size: 0.85rem; font-weight: 800; }
.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.comparison-table th, .comparison-table td { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); }
.comparison-table th { background: #f1f5f9; font-weight: 700; }

/* Payment Modal */
.pay-modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px);
  z-index: 2000; display: none; align-items: center; justify-content: center; padding: 20px;
}
.pay-modal-overlay.open { display: flex; }
.pay-modal-box {
  background: #fff; width: 100%; max-width: 440px; border-radius: 20px; padding: 30px; position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}
.pay-modal-close { position: absolute; top: 20px; right: 20px; font-size: 1.25rem; border: none; background: transparent; cursor: pointer; opacity: 0.5; }

.pay-step { display: none; }
.pay-step.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.pay-step-label { font-size: 0.75rem; font-weight: 800; color: var(--primary); text-transform: uppercase; margin-bottom: 4px; }
.pay-step-title { font-size: 1.5rem; font-weight: 800; color: #0f172a; }
.pay-step-sub { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 20px; }

.pay-badges { display: flex; gap: 8px; margin-bottom: 20px; }
.pay-badge { padding: 4px 10px; border-radius: 6px; font-size: 0.7rem; font-weight: 700; }
.pay-badge-q { background: #fee2e2; color: #991b1b; }
.pay-badge-ans { background: #dcfce7; color: #166534; }
.pay-badge-no { background: #f1f5f9; color: #475569; }

.pay-breakdown { padding: 15px; background: #f8fafc; border-radius: 12px; margin-bottom: 20px; }
.pay-breakdown-row { display: flex; justify-content: space-between; font-size: 0.9rem; margin-bottom: 6px; }
.pay-breakdown-row.green { color: #059669; font-weight: 600; }
.pay-breakdown-row.total { border-top: 1.5px dashed var(--border); padding-top: 8px; margin-top: 8px; font-weight: 800; font-size: 1.1rem; }

.pay-method-label { font-size: 0.85rem; font-weight: 700; margin-bottom: 12px; }
.pay-methods { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.pay-method-option {
  display: flex; align-items: center; gap: 12px; padding: 12px; border: 1.5px solid var(--border);
  border-radius: 10px; cursor: pointer; transition: 0.2s; position: relative;
}
.pay-method-option.selected { border-color: var(--primary); background: #eff6ff; }
.method-icon { font-size: 1.2rem; }
.method-check { display: none; position: absolute; right: 15px; color: var(--primary); font-weight: 800; }
.pay-method-option.selected .method-check { display: block; }

.pay-confirm-btn {
  width: 100%; padding: 16px; background: var(--primary); color: #fff; border: none;
  border-radius: 12px; font-size: 1.1rem; font-weight: 800; cursor: pointer;
}

.pay-processing { text-align: center; padding: 30px 0; }
.pay-spinner-lg {
  width: 60px; height: 60px; border: 6px solid #f1f5f9; border-top-color: var(--primary);
  border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 20px;
}
.pay-done { text-align: center; }
.pay-done-icon { font-size: 4rem; display: block; margin-bottom: 15px; }
.pay-done-btn {
  width: 100%; padding: 14px; background: #059669; color: #fff; border: none;
  border-radius: 10px; font-weight: 700; cursor: pointer; margin-top: 10px;
}

/* ---- TOAST NOTIFICATIONS ---- */
#ec-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 9999;
  min-width: 280px;
  max-width: 480px;
  padding: 13px 20px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.45;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.22);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
}
#ec-toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
#ec-toast.toast-info    { background: #1e3a5f; color: #bfdbfe; border: 1px solid #3b82f6; }
#ec-toast.toast-warn    { background: #3d2a00; color: #fcd34d; border: 1px solid #f59e0b; }
#ec-toast.toast-error   { background: #3b0a0a; color: #fca5a5; border: 1px solid #ef4444; }
#ec-toast.toast-success { background: #052e16; color: #6ee7b7; border: 1px solid #10b981; }

/* Responsive */
@media (max-width: 900px) {
  .generator-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .mini-dashboard { width: 100%; right: -100%; }
  .md-user-row { flex-wrap: wrap; }
}
@media (max-width: 600px) {
  .auth-modal-box { max-width: 95%; padding: 24px 18px; }
  .options-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .auth-area { gap: 6px; }
  #authButtonsGroup { gap: 4px; }
  .auth-btn-signin, .auth-btn-signup { padding: 6px 12px; font-size: 0.78rem; }
  .header-right { gap: 8px; }
  .lang-selector { display: none; }
}


/* ---- HOME BUTTON ---- */
.home-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 7px;
  color: rgba(255,255,255,0.65);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.home-btn:hover { border-color: rgba(255,255,255,0.55); color: #fff; }

/* ---- INPUT MODE TOGGLE ---- */
.input-mode-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  background: #f1f5f9;
  padding: 5px;
  border-radius: 10px;
}
.imt-btn {
  flex: 1;
  padding: 9px 12px;
  border: none;
  background: transparent;
  border-radius: 7px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}
.imt-btn.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}
.imt-btn:hover:not(.active) { color: var(--primary); }

body.dark-theme .input-mode-tabs { background: var(--form-bg); }
body.dark-theme .imt-btn { color: var(--text-muted); }
body.dark-theme .imt-btn.active { background: var(--surface); color: var(--primary); }

/* ---- IMAGE UPLOAD ZONE ---- */
.image-upload-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: #fafbfc;
  user-select: none;
}
.image-upload-zone:hover,
.image-upload-zone.drag-over {
  border-color: var(--primary);
  background: #eff6ff;
}
.upload-zone-icon { font-size: 2.2rem; margin-bottom: 8px; }
.upload-zone-title { font-size: 0.95rem; font-weight: 700; color: var(--text-main); margin-bottom: 4px; }
.upload-zone-sub { font-size: 0.78rem; color: var(--text-muted); }

body.dark-theme .image-upload-zone { background: var(--bg-app); border-color: var(--border); }
body.dark-theme .image-upload-zone:hover,
body.dark-theme .image-upload-zone.drag-over { border-color: var(--primary); background: #1e3a5f33; }

/* ---- IMAGE THUMBNAILS ---- */
.image-thumbnails {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.thumb-item {
  position: relative;
  width: 72px;
  flex-shrink: 0;
}
.thumb-img {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid var(--border);
  display: block;
}
.thumb-remove {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  background: #ef4444;
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.thumb-label {
  display: block;
  text-align: center;
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 3px;
  font-weight: 600;
}