/* ============================================
   AcademAI — Design System v1.0
   Dark Glassmorphism + Premium Micro-animations
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Custom Properties ────────────────── */
:root {
  /* Colors */
  --c-bg:         #09090f;
  --c-bg-2:       #0f0f1a;
  --c-bg-3:       #141428;
  --c-surface:    rgba(255,255,255,0.045);
  --c-surface-2:  rgba(255,255,255,0.08);
  --c-border:     rgba(255,255,255,0.08);
  --c-border-2:   rgba(255,255,255,0.14);

  /* Brand */
  --c-primary:    #6c63ff;
  --c-primary-2:  #8b82ff;
  --c-accent:     #00d4aa;
  --c-accent-2:   #00f5c8;
  --c-pink:       #ff6b9d;
  --c-warn:       #f59e0b;
  --c-danger:     #ef4444;
  --c-success:    #10b981;

  /* Gradients */
  --grad-brand:   linear-gradient(135deg, #6c63ff 0%, #00d4aa 100%);
  --grad-hero:    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(108,99,255,0.25) 0%, transparent 70%);
  --grad-card:    linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.02) 100%);
  --grad-glow:    radial-gradient(circle at 50% 50%, rgba(108,99,255,0.15), transparent 60%);

  /* Text */
  --t-primary:    #f0f0ff;
  --t-secondary:  #9898b8;
  --t-muted:      #5a5a7a;
  --t-accent:     #a29dff;

  /* Sizing */
  --radius-sm:    8px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --radius-xl:    28px;
  --radius-full:  9999px;

  /* Shadows */
  --shadow-sm:    0 2px 8px rgba(0,0,0,0.4);
  --shadow-md:    0 8px 32px rgba(0,0,0,0.5);
  --shadow-lg:    0 20px 60px rgba(0,0,0,0.6);
  --glow-primary: 0 0 30px rgba(108,99,255,0.35);
  --glow-accent:  0 0 30px rgba(0,212,170,0.3);

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-mid:    0.25s ease;
  --t-slow:   0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-w: 260px;
  --header-h:  64px;
}

/* ── Reset ────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--c-bg);
  color: var(--t-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: var(--c-accent); text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; outline: none; }
img { max-width: 100%; display: block; }

/* ── Scrollbar ────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--c-bg-2); }
::-webkit-scrollbar-thumb { background: rgba(108,99,255,0.4); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--c-primary); }

/* ── Background ───────────────────────────── */
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(108,99,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108,99,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}
.bg-glow {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: var(--grad-hero);
}
.bg-orb {
  position: fixed; z-index: 0; pointer-events: none; border-radius: 50%;
  filter: blur(80px); opacity: 0.35;
  animation: orbFloat 8s ease-in-out infinite;
}
.bg-orb-1 { width: 500px; height: 500px; background: var(--c-primary); top: -200px; right: -100px; animation-delay: 0s; }
.bg-orb-2 { width: 400px; height: 400px; background: var(--c-accent); bottom: -150px; left: -100px; animation-delay: -4s; }
@keyframes orbFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

/* ── Header ───────────────────────────────── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(9,9,15,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  display: flex; align-items: center; padding: 0 24px;
  gap: 16px;
}
.header-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 800;
  background: var(--grad-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-logo svg { flex-shrink: 0; }
.header-badge {
  font-size: 0.65rem; font-weight: 600; padding: 2px 8px;
  background: rgba(108,99,255,0.2); border: 1px solid rgba(108,99,255,0.4);
  border-radius: var(--radius-full); color: var(--c-primary-2);
  letter-spacing: 0.05em;
}
.header-spacer { flex: 1; }
.header-status {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.75rem; color: var(--t-secondary);
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 8px var(--c-success);
  animation: pulse-dot 2s ease-in-out infinite;
}
.status-dot.offline { background: var(--c-danger); box-shadow: 0 0 8px var(--c-danger); animation: none; }
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

/* ── Layout ───────────────────────────────── */
.app-layout {
  position: relative; z-index: 1;
  display: flex; flex-direction: column;
  min-height: 100vh; padding-top: var(--header-h);
}
.main-content { flex: 1; display: flex; flex-direction: column; }

/* ── Tab Navigation ───────────────────────── */
.tab-nav {
  position: sticky; top: var(--header-h); z-index: 90;
  background: rgba(9,9,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
  padding: 0 24px;
  display: flex; gap: 4px;
}
.tab-btn {
  position: relative; padding: 14px 20px;
  font-size: 0.875rem; font-weight: 500;
  color: var(--t-muted); border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--t-mid);
  white-space: nowrap;
}
.tab-btn:hover { color: var(--t-secondary); }
.tab-btn.active { color: var(--t-primary); }
.tab-btn.active::after {
  content: '';
  position: absolute; bottom: -1px; left: 0; right: 0; height: 2px;
  background: var(--grad-brand); border-radius: var(--radius-full);
}
.tab-btn span.tab-icon { margin-right: 6px; }
.tab-content { display: none; flex: 1; }
.tab-content.active { display: flex; flex-direction: column; }

/* ── Page Container ───────────────────────── */
.page-container {
  max-width: 900px; margin: 0 auto;
  width: 100%; padding: 32px 24px;
}

/* ── Glass Card ───────────────────────────── */
.glass-card {
  background: var(--grad-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  transition: border-color var(--t-mid), box-shadow var(--t-mid);
}
.glass-card:hover { border-color: var(--c-border-2); }

/* ── Buttons ──────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 10px 20px;
  font-size: 0.875rem; font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--t-mid);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-brand);
  color: #fff;
  box-shadow: 0 4px 20px rgba(108,99,255,0.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(108,99,255,0.5);
}
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  background: var(--c-surface-2);
  border: 1px solid var(--c-border-2);
  color: var(--t-secondary);
}
.btn-secondary:hover { color: var(--t-primary); border-color: var(--c-primary); background: rgba(108,99,255,0.1); }
.btn-ghost {
  color: var(--t-muted); padding: 8px 14px;
}
.btn-ghost:hover { color: var(--t-primary); background: var(--c-surface); }
.btn-danger {
  background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3);
  color: #fca5a5;
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn:disabled { opacity: 0.5; pointer-events: none; }
.btn-icon { padding: 8px; border-radius: var(--radius-sm); }

/* ── Form Elements ────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label {
  font-size: 0.8rem; font-weight: 600;
  color: var(--t-secondary); letter-spacing: 0.04em; text-transform: uppercase;
}
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 10px 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--t-primary);
  font-size: 0.9rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--t-muted); }
.form-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239898b8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }
.form-select option { background: var(--c-bg-3); }
.form-textarea { resize: vertical; min-height: 120px; line-height: 1.6; }
.form-hint { font-size: 0.75rem; color: var(--t-muted); }

/* ── Grid ─────────────────────────────────── */
.form-grid { display: grid; gap: 16px; }
.form-grid-2 { grid-template-columns: repeat(2, 1fr); }
.form-grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ── Chip / Tag ───────────────────────────── */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: var(--radius-full);
  font-size: 0.72rem; font-weight: 600;
}
.chip-primary { background: rgba(108,99,255,0.15); color: var(--c-primary-2); border: 1px solid rgba(108,99,255,0.25); }
.chip-accent  { background: rgba(0,212,170,0.12); color: var(--c-accent); border: 1px solid rgba(0,212,170,0.2); }
.chip-warn    { background: rgba(245,158,11,0.12); color: var(--c-warn); border: 1px solid rgba(245,158,11,0.2); }
.chip-danger  { background: rgba(239,68,68,0.12); color: #fca5a5; border: 1px solid rgba(239,68,68,0.2); }
.chip-success { background: rgba(16,185,129,0.12); color: var(--c-success); border: 1px solid rgba(16,185,129,0.2); }

/* ── ═══════════════════════════════════════
   CHAT TAB
   ═══════════════════════════════════════ */
.chat-layout {
  display: flex; flex-direction: column;
  height: calc(100vh - var(--header-h) - 49px);
  max-width: 860px; margin: 0 auto; width: 100%;
  padding: 0 24px;
}
.chat-controls {
  display: flex; align-items: center; gap: 10px;
  padding: 16px 0; flex-wrap: wrap;
}
.mode-select-wrap { position: relative; }
.mode-badge {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--radius-full);
  background: var(--c-surface); border: 1px solid var(--c-border);
  font-size: 0.8rem; color: var(--t-secondary);
  cursor: pointer; transition: all var(--t-fast);
}
.mode-badge:hover { border-color: var(--c-primary); color: var(--t-primary); }
.mode-badge.active-mode { border-color: rgba(108,99,255,0.5); background: rgba(108,99,255,0.1); color: var(--c-primary-2); }
.session-id-display {
  display: none !important;
}
.chat-messages {
  flex: 1; overflow-y: auto;
  display: flex; flex-direction: column; gap: 20px;
  padding: 8px 0 20px;
}
.chat-empty {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; gap: 20px; padding: 40px 0;
}
.chat-empty-icon {
  width: 80px; height: 80px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(0,212,170,0.1));
  border: 1px solid rgba(108,99,255,0.25);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.chat-empty h3 { font-size: 1.3rem; font-weight: 700; color: var(--t-primary); }
.chat-empty p { color: var(--t-secondary); font-size: 0.9rem; max-width: 380px; line-height: 1.6; }
.chat-suggestions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 8px; }
.suggestion-chip {
  padding: 8px 16px; border-radius: var(--radius-full);
  background: var(--c-surface); border: 1px solid var(--c-border);
  font-size: 0.82rem; color: var(--t-secondary);
  cursor: pointer; transition: all var(--t-mid);
}
.suggestion-chip:hover { border-color: var(--c-primary); color: var(--t-primary); background: rgba(108,99,255,0.08); transform: translateY(-1px); }

/* Message Bubbles */
.msg-row { display: flex; gap: 12px; align-items: flex-start; }
.msg-row.user { flex-direction: row-reverse; }
.msg-avatar {
  width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 700;
}
.msg-avatar.ai {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  box-shadow: 0 0 16px rgba(108,99,255,0.4);
  font-size: 1rem;
}
.msg-avatar.user {
  background: var(--c-surface-2); border: 1px solid var(--c-border-2);
}
.msg-bubble {
  max-width: 78%; padding: 14px 18px;
  border-radius: var(--radius-lg);
  font-size: 0.9rem; line-height: 1.65;
}
.msg-bubble.ai {
  background: var(--grad-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px;
}
.msg-bubble.user {
  background: linear-gradient(135deg, rgba(108,99,255,0.25), rgba(108,99,255,0.15));
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg);
  color: var(--t-primary);
}
.msg-meta {
  font-size: 0.7rem; color: var(--t-muted);
  margin-top: 6px; display: flex; align-items: center; gap: 8px;
}
.msg-actions { display: flex; gap: 4px; opacity: 0; transition: opacity var(--t-fast); }
.msg-row:hover .msg-actions { opacity: 1; }
.msg-action-btn {
  padding: 3px 7px; border-radius: var(--radius-sm);
  font-size: 0.72rem; color: var(--t-muted);
  background: var(--c-surface); border: 1px solid var(--c-border);
  cursor: pointer; transition: all var(--t-fast);
}
.msg-action-btn:hover { color: var(--t-primary); border-color: var(--c-border-2); }

/* Typing Indicator */
.typing-indicator {
  display: flex; align-items: center; gap: 5px;
  padding: 14px 18px;
  background: var(--grad-card); border: 1px solid var(--c-border);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px;
  width: fit-content;
}
.typing-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--c-primary);
  animation: typingBounce 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-8px); opacity: 1; }
}

/* Chat Input */
.chat-input-area {
  padding: 16px 0;
  border-top: 1px solid var(--c-border);
}
.chat-input-wrap {
  display: flex; align-items: flex-end; gap: 10px;
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-xl); padding: 10px 10px 10px 18px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.chat-input-wrap:focus-within {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.12);
}
.chat-textarea {
  flex: 1; background: none; border: none;
  color: var(--t-primary); font-size: 0.9rem;
  resize: none; max-height: 150px; min-height: 24px;
  line-height: 1.5; padding: 3px 0;
}
.chat-textarea::placeholder { color: var(--t-muted); }
.chat-send-btn {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%;
  background: var(--grad-brand);
  display: flex; align-items: center; justify-content: center;
  color: white; transition: all var(--t-mid);
  box-shadow: 0 2px 12px rgba(108,99,255,0.4);
}
.chat-send-btn:hover { transform: scale(1.1); box-shadow: 0 4px 20px rgba(108,99,255,0.55); }
.chat-send-btn:disabled { opacity: 0.4; transform: none; }
.chat-footer-hint { text-align: center; font-size: 0.72rem; color: var(--t-muted); margin-top: 8px; }

/* ── ═══════════════════════════════════════
   GENERATE TAB
   ═══════════════════════════════════════ */
.generate-layout { padding: 32px 24px; max-width: 860px; margin: 0 auto; width: 100%; }
.section-title {
  font-size: 1.5rem; font-weight: 800;
  background: var(--grad-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 6px;
}
.section-subtitle { color: var(--t-secondary); font-size: 0.9rem; margin-bottom: 28px; }
.generate-card { padding: 28px; margin-bottom: 20px; }
.generate-card-title {
  font-size: 0.95rem; font-weight: 700; color: var(--t-primary);
  margin-bottom: 20px; display: flex; align-items: center; gap: 8px;
}
.generate-card-title .icon-wrap {
  width: 32px; height: 32px; border-radius: var(--radius-sm);
  background: rgba(108,99,255,0.15); border: 1px solid rgba(108,99,255,0.25);
  display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
}

/* Progress Steps */
.progress-steps {
  display: flex; gap: 0;
  margin-bottom: 28px; overflow-x: auto; padding-bottom: 4px;
}
.progress-step {
  flex: 1; min-width: 100px;
  display: flex; flex-direction: column; align-items: center;
  gap: 8px; padding: 12px 8px;
  border-radius: var(--radius-md);
  position: relative; text-align: center;
}
.progress-step::after {
  content: '';
  position: absolute; top: 22px; left: 60%; right: -40%;
  height: 2px; background: var(--c-border);
  z-index: 0;
}
.progress-step:last-child::after { display: none; }
.step-circle {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--c-surface); border: 2px solid var(--c-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; color: var(--t-muted);
  position: relative; z-index: 1;
  transition: all var(--t-mid);
}
.progress-step.done .step-circle {
  background: var(--c-success); border-color: var(--c-success);
  color: white; box-shadow: 0 0 16px rgba(16,185,129,0.4);
}
.progress-step.active .step-circle {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-color: transparent; color: white;
  box-shadow: 0 0 20px rgba(108,99,255,0.5);
  animation: stepPulse 1.5s ease-in-out infinite;
}
.progress-step.done::after { background: var(--c-success); }
@keyframes stepPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}
.step-label { font-size: 0.68rem; color: var(--t-muted); line-height: 1.3; }
.progress-step.active .step-label, .progress-step.done .step-label { color: var(--t-secondary); }

/* Output Preview */
.output-card {
  padding: 0; overflow: hidden;
  border: 1px solid var(--c-border);
}
.output-toolbar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-bottom: 1px solid var(--c-border);
  background: rgba(255,255,255,0.02);
}
.output-toolbar-title { font-size: 0.82rem; color: var(--t-secondary); font-weight: 600; flex: 1; }
.output-body {
  padding: 24px; max-height: 600px; overflow-y: auto;
  font-size: 0.88rem; line-height: 1.75;
  color: var(--t-primary);
}
.output-placeholder {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 60px 24px; gap: 12px; text-align: center;
}
.output-placeholder-icon { font-size: 2.5rem; opacity: 0.3; }
.output-placeholder p { color: var(--t-muted); font-size: 0.85rem; }

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--c-surface) 25%, var(--c-surface-2) 50%, var(--c-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { to { background-position: -200% center; } }
.skeleton-line { height: 14px; margin-bottom: 10px; }
.skeleton-line:last-child { width: 60%; }

/* ── ═══════════════════════════════════════
   VALIDATOR TAB
   ═══════════════════════════════════════ */
.validator-layout { padding: 32px 24px; max-width: 860px; margin: 0 auto; width: 100%; }
.validator-input-card { padding: 24px; margin-bottom: 20px; }
.validator-results { display: flex; flex-direction: column; gap: 12px; }
.citation-result-item {
  padding: 16px 18px; border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
  background: rgba(255,255,255,0.025);
  transition: border-color var(--t-fast);
}
.citation-result-item:hover { border-color: var(--c-border-2); }
.citation-result-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.citation-status-icon { font-size: 1.1rem; }
.citation-raw { font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; color: var(--t-accent); font-weight: 500; }
.citation-status-badge { margin-left: auto; }
.citation-detail { font-size: 0.82rem; color: var(--t-secondary); line-height: 1.6; }
.citation-detail strong { color: var(--t-primary); }
.citation-suggestion {
  margin-top: 8px; padding: 8px 12px;
  background: rgba(245,158,11,0.06); border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.78rem; color: var(--c-warn);
}
.validator-summary {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
  margin-bottom: 24px;
}
.summary-stat {
  padding: 16px; text-align: center;
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
}
.summary-stat-num { font-size: 1.8rem; font-weight: 800; }
.summary-stat-label { font-size: 0.72rem; color: var(--t-muted); margin-top: 4px; }
.summary-stat.total .summary-stat-num { color: var(--t-primary); }
.summary-stat.valid .summary-stat-num { color: var(--c-success); }
.summary-stat.partial .summary-stat-num { color: var(--c-warn); }
.summary-stat.invalid .summary-stat-num { color: var(--c-danger); }

/* ── Markdown Render ──────────────────────── */
.md-body { color: var(--t-primary); }
.md-body h1, .md-body h2, .md-body h3, .md-body h4 { font-weight: 700; margin: 1.4em 0 0.6em; line-height: 1.3; color: var(--t-primary); }
.md-body h1 { font-size: 1.6rem; border-bottom: 1px solid var(--c-border); padding-bottom: 8px; }
.md-body h2 { font-size: 1.25rem; color: var(--c-primary-2); }
.md-body h3 { font-size: 1.05rem; }
.md-body p { margin: 0.75em 0; }
.md-body a { color: var(--c-accent); }
.md-body a:hover { text-decoration: underline; }
.md-body code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.83em;
  background: rgba(108,99,255,0.12); border: 1px solid rgba(108,99,255,0.2);
  padding: 1px 6px; border-radius: 4px; color: var(--c-primary-2);
}
.md-body pre {
  background: var(--c-bg-3); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 16px; overflow-x: auto;
  margin: 1em 0;
}
.md-body pre code { background: none; border: none; padding: 0; color: var(--t-primary); }
.md-body blockquote {
  border-left: 3px solid var(--c-primary); padding-left: 16px;
  margin: 1em 0; color: var(--t-secondary); font-style: italic;
}
.md-body table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 0.85rem; }
.md-body th, .md-body td { border: 1px solid var(--c-border); padding: 8px 12px; text-align: left; }
.md-body th { background: rgba(108,99,255,0.1); font-weight: 600; color: var(--c-primary-2); }
.md-body tr:hover td { background: rgba(255,255,255,0.02); }
.md-body ul, .md-body ol { padding-left: 1.5em; margin: 0.5em 0; }
.md-body li { margin: 0.3em 0; }
.md-body hr { border: none; border-top: 1px solid var(--c-border); margin: 1.5em 0; }
.md-body strong { color: var(--t-primary); font-weight: 700; }
.md-body em { color: var(--t-secondary); }

/* ── Toast Notifications ─────────────────── */
.toast-container {
  position: fixed; bottom: 24px; right: 24px; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px; pointer-events: none;
}
.toast {
  pointer-events: all;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px; border-radius: var(--radius-md);
  background: var(--c-bg-3); border: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  font-size: 0.875rem; color: var(--t-primary);
  max-width: 340px; animation: toastIn 0.3s var(--t-slow) both;
}
.toast.removing { animation: toastOut 0.25s ease-in both; }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }
.toast.success { border-color: rgba(16,185,129,0.3); }
.toast.error   { border-color: rgba(239,68,68,0.3); }
.toast.info    { border-color: rgba(108,99,255,0.3); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px) scale(0.95); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes toastOut {
  to { opacity: 0; transform: translateX(20px) scale(0.9); }
}

/* ── Mode Picker Dropdown ─────────────────── */
.mode-dropdown {
  position: absolute; top: calc(100% + 6px); left: 0;
  background: var(--c-bg-2); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 6px; z-index: 200;
  min-width: 200px; box-shadow: var(--shadow-lg);
  animation: dropIn 0.15s ease both;
}
@keyframes dropIn { from { opacity: 0; transform: translateY(-6px); } }
.mode-option {
  padding: 9px 12px; border-radius: var(--radius-sm);
  cursor: pointer; display: flex; align-items: center; gap: 10px;
  font-size: 0.85rem; transition: background var(--t-fast);
}
.mode-option:hover { background: var(--c-surface); }
.mode-option.selected { background: rgba(108,99,255,0.12); color: var(--c-primary-2); }
.mode-option-icon { font-size: 1rem; }
.mode-option-desc { font-size: 0.72rem; color: var(--t-muted); display: block; margin-top: 1px; }

/* ── Responsive ───────────────────────────── */
@media (max-width: 768px) {
  .form-grid-2, .form-grid-3 { grid-template-columns: 1fr; }
  .validator-summary { grid-template-columns: repeat(2, 1fr); }
  .progress-steps { gap: 0; }
  .progress-step { min-width: 70px; }
  .progress-step::after { display: none; }
  .page-container, .generate-layout, .validator-layout { padding: 20px 16px; }
  .chat-layout { padding: 0 16px; }
  .msg-bubble { max-width: 90%; }
  .session-id-display { display: none; }
}
@media (max-width: 480px) {
  .tab-btn { padding: 12px 14px; font-size: 0.8rem; }
  .tab-btn span.tab-icon { display: none; }
}

/* ── Misc Utilities ───────────────────────── */
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.ml-auto { margin-left: auto; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.hidden { display: none !important; }
.text-muted { color: var(--t-muted); }
.text-sm { font-size: 0.85rem; }
.font-mono { font-family: 'JetBrains Mono', monospace; }
.w-full { width: 100%; }
.spin { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.divider { height: 1px; background: var(--c-border); margin: 20px 0; }

/* ── Modal Dialog ─────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 24, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
  animation: fadeIn 0.2s ease;
}
.modal-box {
  background: #14172b;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  max-width: 500px;
  width: 100%;
  padding: 22px;
  animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 14px;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(16px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* ── Memory System Styles ─────────────────── */
.btn-accent {
  background: linear-gradient(135deg, #00d4aa 0%, #00a885 100%);
  color: #09090f;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--t-fast);
}
.btn-accent:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 16px rgba(0, 212, 170, 0.4);
  transform: translateY(-1px);
}

.memory-context-banner {
  background: linear-gradient(90deg, rgba(108,99,255,0.15) 0%, rgba(0,212,170,0.12) 100%);
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  margin: 0 0 12px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideUp 0.2s ease;
}
.memory-banner-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--t-primary);
  font-weight: 500;
}
.memory-banner-icon {
  font-size: 1.1rem;
}
.memory-banner-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-xs {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
}

.memory-modal-box {
  max-width: 620px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}
.memory-docs-list {
  overflow-y: auto;
  max-height: 48vh;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
  padding-right: 4px;
}
.memory-doc-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all var(--t-fast);
}
.memory-doc-card:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(108, 99, 255, 0.4);
}
.memory-doc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.memory-doc-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--t-primary);
}
.memory-doc-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  background: rgba(108, 99, 255, 0.2);
  color: var(--c-primary-2);
  border-radius: 99px;
  font-family: 'JetBrains Mono', monospace;
}
.memory-doc-meta {
  font-size: 0.78rem;
  color: var(--t-secondary);
  display: flex;
  align-items: center;
  gap: 12px;
}
.memory-doc-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  padding-top: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.memory-modal-footer {
  display: flex;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 14px;
}
.btn-danger {
  background: rgba(239, 68, 68, 0.2);
  color: #ff6b6b;
  border: 1px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.8rem;
  transition: all var(--t-fast);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.4);
  color: white;
}

/* ── PDF Upload & Attachment Styles ────────── */
.chat-attach-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--t-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all var(--t-fast);
  margin-right: 4px;
  flex-shrink: 0;
}
.chat-attach-btn:hover {
  color: var(--c-accent);
  background: rgba(0, 212, 170, 0.12);
  border-color: rgba(0, 212, 170, 0.4);
  transform: translateY(-1px);
}

.pdf-upload-box {
  background: rgba(108, 99, 255, 0.08);
  border: 1px dashed rgba(108, 99, 255, 0.35);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  cursor: pointer;
  transition: all var(--t-fast);
}
.pdf-upload-box:hover {
  background: rgba(108, 99, 255, 0.14);
  border-color: var(--c-primary-2);
  box-shadow: 0 0 16px rgba(108, 99, 255, 0.2);
}
.pdf-upload-icon {
  font-size: 1.8rem;
  line-height: 1;
}
.pdf-upload-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.pdf-upload-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--t-primary);
}
.pdf-upload-sub {
  font-size: 0.75rem;
  color: var(--t-secondary);
}

/* ── Plagiarism Checker Styles ─────────────── */
.plagiarism-layout {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.plagiarism-summary {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 14px;
  animation: fadeIn 0.25s ease;
}
.similarity-score-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.similarity-percentage {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 4px;
}
.similarity-score-box.safe .similarity-percentage { color: var(--c-success); }
.similarity-score-box.warning .similarity-percentage { color: var(--c-warn); }
.similarity-score-box.high .similarity-percentage { color: var(--c-danger); }

.similarity-label {
  font-size: 0.75rem;
  color: var(--t-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
.similarity-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 99px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--c-success);
}
.similarity-score-box.warning .similarity-badge {
  background: rgba(245, 158, 11, 0.15);
  color: var(--c-warn);
}
.similarity-score-box.high .similarity-badge {
  background: rgba(239, 68, 68, 0.15);
  color: var(--c-danger);
}

.plagiarism-sentence-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.plagiarism-item {
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 4px solid var(--c-danger);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all var(--t-fast);
}
.plagiarism-item:hover {
  background: rgba(255, 255, 255, 0.06);
}
.plagiarism-item.warning {
  border-left-color: var(--c-warn);
}
.plagiarism-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.plagiarism-item-source {
  font-size: 0.8rem;
  color: var(--t-secondary);
}
.plagiarism-item-score {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(239, 68, 68, 0.2);
  color: #ff6b6b;
}
.plagiarism-original {
  font-size: 0.88rem;
  color: var(--t-primary);
  background: rgba(239, 68, 68, 0.08);
  padding: 8px 12px;
  border-radius: 6px;
  line-height: 1.5;
}
.plagiarism-suggestion-box {
  background: rgba(0, 212, 170, 0.08);
  border: 1px solid rgba(0, 212, 170, 0.2);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.plagiarism-suggestion-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.plagiarism-suggestion-text {
  font-size: 0.88rem;
  color: var(--t-primary);
  line-height: 1.5;
}