/* ================================================================
   SUMARIE — style.css
   Futuristic minimalist academic interface
   ================================================================ */

/* ─── DESIGN TOKENS ────────────────────────────────────────────── */
:root {
  --primary:        #2563EB;
  --primary-hover:  #1D4ED8;
  --primary-light:  #EFF6FF;
  --secondary:      #38BDF8;
  --accent:         #6366F1;

  --bg:             #FFFFFF;
  --bg-secondary:   #F8FAFC;
  --bg-tertiary:    #F1F5F9;

  --surface:        #FFFFFF;
  --surface-glass:  rgba(255, 255, 255, 0.85);

  --text-primary:   #0F172A;
  --text-secondary: #475569;
  --text-muted:     #94A3B8;
  --text-inverse:   #FFFFFF;

  --border:         #E2E8F0;
  --border-focus:   #2563EB;
  --border-hover:   #CBD5E1;

  --blue-50:        #EFF6FF;
  --blue-100:       #DBEAFE;

  --success:        #10B981;
  --warning:        #F59E0B;
  --error:          #EF4444;

  --shadow-sm:    0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md:    0 4px 16px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.05);
  --shadow-lg:    0 12px 40px rgba(15, 23, 42, 0.12), 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-xl:    0 24px 64px rgba(15, 23, 42, 0.16), 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-blue:  0 8px 32px rgba(37, 99, 235, 0.24);

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  20px;

  --transition: 0.2s ease;
  --transition-slow: 0.3s ease;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --navbar-h: 64px;
  --max-w: 860px;
}

/* ─── DARK MODE TOKENS ─────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:             #0A0F1E;
  --bg-secondary:   #0F172A;
  --bg-tertiary:    #1E293B;

  --surface:        #111827;
  --surface-glass:  rgba(17, 24, 39, 0.85);

  --text-primary:   #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted:     #64748B;

  --border:         #1E293B;
  --border-hover:   #334155;

  --blue-50:        rgba(37, 99, 235, 0.12);
  --blue-100:       rgba(37, 99, 235, 0.2);

  --shadow-sm:    0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md:    0 4px 16px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg:    0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 16px rgba(0, 0, 0, 0.3);
}

/* ─── RESET & BASE ─────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg);
  min-height: 100vh;
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

/* Animated background gradient */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 40% at 50% -10%, rgba(37, 99, 235, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 30% at 80% 80%, rgba(56, 189, 248, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  transition: opacity var(--transition-slow);
}

[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse 80% 40% at 50% -10%, rgba(37, 99, 235, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 30% at 80% 80%, rgba(56, 189, 248, 0.08) 0%, transparent 50%);
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, select, textarea { font-family: inherit; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ─── NAVBAR ────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--navbar-h);
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition), background var(--transition-slow), border-color var(--transition-slow);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.85; }
.logo-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun  { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* ─── BUTTONS ───────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--primary);
  color: var(--text-inverse);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-blue);
  letter-spacing: 0.01em;
}
.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.32);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}
.btn-ghost.btn-sm { padding: 6px 12px; font-size: 13px; }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--blue-50);
}

.btn-full { width: 100%; justify-content: center; }

.link-btn {
  font-size: 13px;
  color: var(--primary);
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--transition);
}
.link-btn:hover { opacity: 0.75; }

/* ─── CARDS ─────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-slow), border-color var(--transition-slow), background var(--transition-slow);
  position: relative;
  z-index: 1;
}
.card:hover {
  box-shadow: var(--shadow-lg);
}

/* ─── HERO ──────────────────────────────────────────────────────── */
.hero {
  padding: calc(var(--navbar-h) + 72px) 24px 48px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--blue-50);
  color: var(--primary);
  border: 1px solid var(--blue-100);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
  font-weight: 400;
  line-height: 1.65;
}

/* ─── APP SECTION ───────────────────────────────────────────────── */
.app-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  z-index: 1;
}

/* ─── INPUT CARD ────────────────────────────────────────────────── */
.card-input {
  padding: 24px;
}

.controls-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Segmented control */
.segmented {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}
.seg-btn {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: calc(var(--radius-md) - 3px);
  transition: all var(--transition);
  white-space: nowrap;
}
.seg-btn:hover { color: var(--text-primary); }
.seg-btn.active {
  background: var(--surface);
  color: var(--primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* Select */
.select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.styled-select {
  appearance: none;
  -webkit-appearance: none;
  padding: 7px 32px 7px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), background var(--transition);
  cursor: pointer;
}
.styled-select:hover { border-color: var(--border-hover); }
.styled-select:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12); }
.select-chevron {
  position: absolute;
  right: 8px;
  pointer-events: none;
  color: var(--text-muted);
}

/* Upload button */
.btn-upload {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn-upload:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--blue-50);
}

/* Textarea */
.textarea-wrapper {
  position: relative;
}
.main-textarea {
  width: 100%;
  min-height: 240px;
  max-height: 480px;
  padding: 20px;
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition-slow);
  outline: none;
}
.main-textarea::placeholder { color: var(--text-muted); }
.main-textarea:hover { border-color: var(--border-hover); }
.main-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  background: var(--bg);
}
.char-limit-warning .main-textarea {
  border-color: var(--warning) !important;
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.12) !important;
}

.clear-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  transition: all var(--transition);
  opacity: 0;
  transform: scale(0.8);
}
.clear-btn:not([hidden]) {
  opacity: 1;
  transform: scale(1);
}
.clear-btn:hover {
  color: var(--error);
  background: rgba(239, 68, 68, 0.1);
}

/* Input footer */
.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 12px;
}
.meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.word-count, .char-count {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition);
}
.char-limit-warning .char-count {
  color: var(--warning);
  font-weight: 600;
}

.btn-summarize {
  padding: 11px 24px;
  font-size: 15px;
}
.btn-summarize svg {
  transition: transform var(--transition);
}
.btn-summarize:hover:not(:disabled) svg {
  transform: rotate(-5deg) scale(1.1);
}

/* ─── OUTPUT CARD ───────────────────────────────────────────────── */
.card-output {
  padding: 28px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}

/* Empty state */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px;
  gap: 14px;
}
.empty-icon {
  margin-bottom: 6px;
  transition: transform var(--transition-slow);
}
.card-output:hover .empty-icon {
  transform: translateY(-4px);
}
.empty-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}
.empty-desc {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 280px;
}

/* Skeleton loader */
.skeleton-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 8px 0;
}
.skeleton-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.skeleton-line {
  height: 14px;
  border-radius: 100px;
  background: linear-gradient(90deg,
    var(--bg-tertiary) 25%,
    var(--border-hover) 37%,
    var(--bg-tertiary) 63%
  );
  background-size: 400px 100%;
  animation: shimmer 1.4s infinite ease-in-out;
}
.skeleton-title {
  height: 18px;
  width: 140px;
}
.skeleton-badge {
  width: 80px;
  height: 24px;
  border-radius: 100px;
  background: linear-gradient(90deg,
    var(--bg-tertiary) 25%,
    var(--border-hover) 37%,
    var(--bg-tertiary) 63%
  );
  background-size: 400px 100%;
  animation: shimmer 1.4s infinite ease-in-out;
}
@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

/* Result */
.result-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  animation: fadeSlideIn 0.35s ease forwards;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.result-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.result-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--blue-50);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 100px;
  border: 1px solid var(--blue-100);
}
.result-stats {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.action-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--blue-50);
}
.action-btn.copied {
  color: var(--success);
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.08);
}

/* Result content */
.result-content {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-primary);
  flex: 1;
}
.result-content p {
  margin-bottom: 12px;
}
.result-content p:last-child { margin-bottom: 0; }
.result-content ul {
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.result-content ul li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 18px;
  background: var(--bg-secondary);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  line-height: 1.7;
  transition: background var(--transition), border-color var(--transition);
}
.result-content ul li:hover {
  background: var(--blue-50);
  border-color: var(--secondary);
}
.result-content ul li::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  margin-top: 7px;
}
.result-content strong { font-weight: 700; color: var(--primary); }
.result-content h2, .result-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 18px 0 8px;
}

/* ─── HISTORY SECTION ───────────────────────────────────────────── */
.history-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 64px;
  position: relative;
  z-index: 1;
}
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}
.section-title.centered {
  justify-content: center;
}
.section-title svg { color: var(--primary); }

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.history-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  cursor: pointer;
  transition: all var(--transition);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}
.history-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateX(2px);
}
.history-preview {
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 400;
}
.history-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.history-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--blue-50);
  padding: 3px 8px;
  border-radius: 100px;
}
.history-time {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ─── HOW IT WORKS ──────────────────────────────────────────────── */
.how-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 96px;
  position: relative;
  z-index: 1;
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  position: relative;
  transition: all var(--transition-slow);
  overflow: hidden;
}
.step-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--blue-50) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-slow);
}
.step-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.step-card:hover::before { opacity: 1; }

.step-num {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.step-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-50);
  border-radius: var(--radius-md);
  color: var(--primary);
  margin-bottom: 16px;
  transition: transform var(--transition), background var(--transition);
}
.step-card:hover .step-icon {
  background: var(--primary);
  color: white;
  transform: scale(1.08);
}
.step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.step-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ─── FOOTER ────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  background: var(--bg-secondary);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.footer-copy {
  font-size: 13px;
  color: var(--text-secondary);
}
.footer-legal {
  font-size: 12px;
  color: var(--text-muted);
}

/* ─── AUTH MODAL ────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}
.modal-overlay[hidden] { display: none; }
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 36px;
  width: 100%;
  max-width: 420px;
  position: relative;
  animation: slideUp 0.25s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition);
}
.modal-close:hover { color: var(--text-primary); background: var(--bg-tertiary); }

.modal-icon {
  margin-bottom: 20px;
}
.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.modal-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ─── SUMMARY MODAL ─────────────────────────────────────────────── */
.summary-card {
  max-width: 680px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}
.summary-modal-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.summary-modal-content {
  overflow-y: auto;
  padding-right: 12px;
  flex: 1;
}

/* Custom scrollbar for modal content */
.summary-modal-content::-webkit-scrollbar {
  width: 6px;
}
.summary-modal-content::-webkit-scrollbar-track {
  background: transparent;
}
.summary-modal-content::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 10px;
}

.auth-tabs {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
  margin-bottom: 24px;
}
.auth-tab {
  flex: 1;
  padding: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: calc(var(--radius-md) - 3px);
  transition: all var(--transition);
}
.auth-tab.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}
.auth-tab:hover:not(.active) { color: var(--text-primary); }

.auth-form { display: flex; flex-direction: column; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; font-weight: 600; color: var(--text-secondary); }
.form-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:hover { border-color: var(--border-hover); }
.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
  background: var(--bg);
}
.input-wrapper { position: relative; }
.input-wrapper .form-input { padding-right: 44px; }
.toggle-password {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.toggle-password:hover { color: var(--text-primary); }

.form-error {
  padding: 10px 14px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--error);
  font-weight: 500;
}
.form-error[hidden] { display: none; }

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
}
.auth-divider::before, .auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.auth-skip {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── TOAST ─────────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 28px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  pointer-events: auto;
  min-width: 240px;
  max-width: 340px;
  animation: toastIn 0.3s ease forwards;
}
.toast.toast-exit {
  animation: toastOut 0.25s ease forwards;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--error); }
.toast.info    { border-left: 3px solid var(--primary); }
.toast-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.toast.success .toast-dot { background: var(--success); }
.toast.error   .toast-dot { background: var(--error); }
.toast.info    .toast-dot { background: var(--primary); }
@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(8px) scale(0.96); }
}

/* ─── LOADING SPINNER on button ─────────────────────────────────── */
.is-loading .btn-summarize {
  pointer-events: none;
}
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── RESPONSIVE ────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero { padding-top: calc(var(--navbar-h) + 48px); }
  .hero-title { font-size: 2.1rem; }
  .controls-row { gap: 10px; }
  .control-label { display: none; }
  .card-input { padding: 16px; }
  .card-output { padding: 20px; }
  .btn-summarize { width: 100%; justify-content: center; }
  .input-footer { flex-direction: column; align-items: stretch; }
  .result-header { flex-direction: column; align-items: flex-start; }
  .modal-card { padding: 24px; }
  .steps-grid { grid-template-columns: 1fr; }
  .history-item { grid-template-columns: 1fr; }
  .history-meta { justify-content: flex-start; }
  .nav-link { display: none; }
}

@media (max-width: 400px) {
  .segmented { gap: 1px; }
  .seg-btn { padding: 5px 10px; font-size: 12px; }
  .upload-group { display: none; }
}