/* JTR Brainstorming Design System — based on ui-guidelines.md v2 */

/* Table of Contents:
   1.  L26-L64:   CSS Custom Properties — Light Mode
   2.  L66-L90:   Dark Mode overrides
   3.  L92-L144:  Reset & Base
   4.  L146-L155: Layout — Container
   5.  L157-L188: Typography utilities
   6.  L190-L310: Buttons (+ sidebar toggle, mobile menu, overlay)
   7.  L312-L354: Forms
   8.  L356-L405: Header / Top Navigation
   9.  L407-L422: Main Layout
   10. L424-L575: History Sidebar (collapsed, icon rail, search, items, responsive)
   11. L577-L619: Framework Cards
   12. L621-L670: Step Cards (analysis results)
   13. L672-L686: Alerts & Notifications
   14. L688-L701: Credit Badge
   15. L703-L734: Progress / Loading
   16. L736-L761: Empty State
   17. L763-L812: Login / Auth
   18. L814-L820: Scroll Reveal
   19. L822-L856: Accessibility + reduced-motion
   20. L858-L898: Responsive Breakpoints (1024px, 768px, 480px)
   21. L900-L908: Print Styles */

/* 1. CSS Custom Properties — Light Mode (default) */
:root {
  --color-bg: #fafafa;
  --color-bg-alt: #ffffff;
  --color-bg-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a7a;
  --color-accent: #0f4c5c;
  --color-accent-hover: #0a3a47;
  --color-accent-light: rgba(15, 76, 92, 0.08);
  --color-border: rgba(15, 76, 92, 0.12);
  --color-gold: #b8860b;
  --color-gold-light: rgba(184, 134, 11, 0.1);
  --color-success: #16a34a;
  --color-success-light: rgba(22, 163, 74, 0.1);
  --color-error: #dc2626;
  --color-error-light: rgba(220, 38, 38, 0.1);
  --color-warning: #f59e0b;
  --color-warning-light: rgba(245, 158, 11, 0.1);
  --color-info: #0ea5e9;
  --color-info-light: rgba(14, 165, 233, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --header-height: 72px;
  --section-padding: 100px;
  --container-padding: 24px;
  --card-padding: 32px;
  --grid-gap: 32px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 100px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  --transition-theme: background 0.3s ease, color 0.3s ease, border-color 0.3s ease,
    box-shadow 0.3s ease;
}

/* 2. Dark Mode */
[data-theme="dark"] {
  --color-bg: #0a0a1a;
  --color-bg-alt: #111128;
  --color-bg-card: #16163a;
  --color-text: #e0e0f0;
  --color-text-muted: #8888aa;
  --color-accent: #00b4d8;
  --color-accent-hover: #48cae4;
  --color-accent-light: rgba(0, 180, 216, 0.1);
  --color-border: rgba(0, 180, 216, 0.15);
  --color-gold: #f0c040;
  --color-gold-light: rgba(240, 192, 64, 0.1);
  --color-success: #22c55e;
  --color-success-light: rgba(34, 197, 94, 0.1);
  --color-error: #ef4444;
  --color-error-light: rgba(239, 68, 68, 0.1);
  --color-warning: #fbbf24;
  --color-warning-light: rgba(251, 191, 36, 0.1);
  --color-info: #38bdf8;
  --color-info-light: rgba(56, 189, 248, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
}

/* 3. Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  transition: var(--transition-theme);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}
a:hover { color: var(--color-accent-hover); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 { line-height: 1.2; color: var(--color-text); }
h1 { font-size: clamp(2.2rem, 6vw, 4.5rem); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 700; }
h4 { font-size: 1.1rem; font-weight: 700; }

code, pre {
  font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  font-size: 0.875rem;
}

pre {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  white-space: pre-wrap;
  line-height: 1.7;
}

::selection { background: var(--color-accent); color: #fff; }

/* 4. Layout — Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
}

/* 5. Typography utilities */
.text-muted    { color: var(--color-text-muted); }
.text-accent   { color: var(--color-accent); }
.text-center   { text-align: center; }

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-block;
  margin-bottom: 12px;
}
.input-label-lg {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.form-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.char-counter {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* 6. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  text-decoration: none;
  line-height: 1.3;
  font-family: var(--font-family);
}
.btn:hover     { transform: translateY(-2px); }
.btn:active    { transform: translateY(0); }
.btn:disabled  { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-outline:hover { color: var(--color-accent); border-color: var(--color-accent); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
  padding: 8px 16px;
  font-weight: 500;
  font-size: 0.85rem;
}
.btn-ghost:hover {
  color: var(--color-accent);
  background: var(--color-accent-light);
  transform: none;
}

.btn-lg   { padding: 14px 32px; font-size: 1.05rem; }
.btn-sm   { padding: 6px 16px; font-size: 0.85rem; }
.btn-full { width: 100%; }

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

/* Sidebar toggle — desktop only */
.sidebar-toggle {
  flex-shrink: 0;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--transition-base);
  perspective: 800px;
}
.sidebar-toggle:hover { color: var(--color-accent); }
body:has(.history-sidebar--collapsed) .sidebar-toggle-icon { transform: rotateY(180deg); }
.sidebar-toggle-icon {
  transition: transform var(--transition-slow);
  transform-style: preserve-3d;
}

/* Mobile menu button — hidden on desktop, shown ≤1024px */
.mobile-menu-btn {
  display: none;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0;
  margin-right: 8px;
  transition: color var(--transition-base);
}
.mobile-menu-btn:hover { color: var(--color-accent); }
.mobile-menu-btn .burger-icon,
.mobile-menu-btn .close-icon {
  transition: opacity 0.2s ease, transform 0.3s ease;
}
.mobile-menu-btn .burger-icon { display: block; }
.mobile-menu-btn .close-icon  { display: none; }
body:has(.history-sidebar--open) .mobile-menu-btn .burger-icon { display: none; }
body:has(.history-sidebar--open) .mobile-menu-btn .close-icon  { display: block; }

/* Sidebar overlay — mobile backdrop */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 499;
  transition: opacity 0.3s ease;
}
.sidebar-overlay--visible { display: block; }

/* 7. Forms */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}
.form-group textarea { resize: vertical; min-height: 100px; }

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-top: 4px;
}

/* 8. Header / Top Navigation */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-theme), box-shadow var(--transition-base);
  display: flex;
  align-items: center;
}
.app-header--scrolled { box-shadow: var(--shadow-sm); }

.app-header__sidebar-gap {
  width: 320px;
  min-width: 320px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  height: 100%;
  transition: width var(--transition-slow), min-width var(--transition-slow);
}
body:has(.history-sidebar--collapsed) .app-header__sidebar-gap {
  width: 60px;
  min-width: 60px;
}

.app-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  flex: 1;
}
.app-header__logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}
.app-header__logo:hover { color: var(--color-accent); transform: none; }
.app-header__right { display: flex; align-items: center; gap: 12px; }

/* 9. Main Layout */
.app-body {
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
}
.analysis-main {
  flex: 1;
  padding: 40px 32px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}
@media (max-width: 768px) {
  .analysis-main { padding: 24px 16px; }
}

/* 10. History Sidebar */
.history-sidebar {
  width: 320px;
  min-width: 320px;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg-card);
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--header-height));
  transition: var(--transition-theme), width var(--transition-slow),
    min-width var(--transition-slow), transform var(--transition-slow);
  position: sticky;
  top: var(--header-height);
  overflow: hidden;
}

/* Collapsed sidebar state */
.history-sidebar--collapsed {
  width: 60px !important;
  min-width: 60px !important;
  overflow: hidden;
}
.history-sidebar--collapsed .history-sidebar__header .history-sidebar__header-expanded {
  display: none !important;
}
.history-sidebar--collapsed .history-sidebar__list { visibility: hidden; overflow: hidden; }
.history-sidebar--collapsed .credit-badge,
.history-sidebar--collapsed .history-sidebar__footer .btn {
  overflow: hidden !important;
  white-space: nowrap;
}
.history-sidebar--collapsed .credit-badge {
  width: 28px !important;
  padding: 6px 0 !important;
  justify-content: center;
}
.history-sidebar--collapsed .history-sidebar__footer .btn {
  width: 36px !important;
  padding: 6px 0 !important;
  justify-content: center;
}
.history-sidebar--collapsed .history-sidebar__footer {
  padding: 16px 8px 24px;
  gap: 8px;
}
.history-sidebar--collapsed .footer-label { display: none; }

/* Collapsed icon rail */
.history-sidebar__header-collapsed {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
}
.history-sidebar--collapsed .history-sidebar__header-collapsed { display: flex; }
.history-sidebar__collapsed-icon {
  font-size: 1.1rem;
  line-height: 1;
  cursor: default;
  user-select: none;
}
.history-sidebar--collapsed .history-sidebar__header { padding: 0; }

.history-sidebar__header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px 16px;
  flex-shrink: 0;
}
.history-sidebar__header h2 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
}
.history-sidebar__list {
  flex: 1;
  overflow-y: auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.history-sidebar__footer {
  flex-shrink: 0;
  padding: 16px 20px 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
}
.search-input:focus { outline: none; border-color: var(--color-accent); }

.history-item {
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--color-bg);
}
.history-item:hover { border-color: var(--color-accent); box-shadow: var(--shadow-sm); }
.history-item__question {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.history-item__meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
}
.history-loading {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
  padding: 24px;
}

@media (max-width: 1024px) {
  .history-sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    z-index: 500;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  .history-sidebar--open { transform: translateX(0); }
}

/* 11. Framework Cards */
.framework-fieldset { border: none; margin: 20px 0; }
.framework-fieldset legend { margin-bottom: 16px; }

.framework-card {
  display: block;
  padding: 16px 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-slow);
  background: var(--color-bg-card);
  margin-bottom: 8px;
}
.framework-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.framework-card--selected,
.framework-card:has(.framework-card__radio:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}
.framework-card__radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.framework-card__body { display: flex; flex-direction: column; gap: 4px; }
.framework-card__category {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent);
}
.framework-card__name     { font-size: 1rem; font-weight: 700; }
.framework-card__desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* 12. Step Cards (analysis results) */
.step-card {
  margin-bottom: 20px;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  animation: slideIn 0.35s ease forwards;
  transition: var(--transition-theme), box-shadow var(--transition-base);
}
.step-card:hover { box-shadow: var(--shadow-md); }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.step-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 12px;
}
.step-card__number {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent);
}
.step-card__title       { font-size: 1.15rem; font-weight: 700; flex: 1; }
.step-card__description {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 12px;
}
.step-card__content { line-height: 1.8; }
.step-card__content h1, .step-card__content h2, .step-card__content h3 {
  margin-top: 16px;
  margin-bottom: 8px;
}
.step-card__content p  { margin-bottom: 12px; }
.step-card__content ul, .step-card__content ol {
  padding-left: 24px;
  margin-bottom: 12px;
}
.step-card__content li { margin-bottom: 4px; }
.markdown-source { display: none; }

/* 13. Alerts & Notifications */
.alert {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.alert-warning { background: var(--color-warning-light); color: var(--color-warning); border: 1px solid var(--color-warning); }
.alert-error   { background: var(--color-error-light);   color: var(--color-error);   border: 1px solid var(--color-error); }
.alert-success { background: var(--color-success-light); color: var(--color-success); border: 1px solid var(--color-success); }
.alert-info    { background: var(--color-info-light);    color: var(--color-info);    border: 1px solid var(--color-info); }

/* 14. Credit Badge */
.credit-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--color-accent-light);
  color: var(--color-accent);
  transition: var(--transition-theme);
}
.credit-badge--low { background: var(--color-error-light); color: var(--color-error); }

/* 15. Progress / Loading */
.htmx-indicator {
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}
.htmx-request .htmx-indicator,
.htmx-indicator.htmx-request {
  opacity: 1;
  pointer-events: auto;
}

/* --- Analysis Progress Card (replaces submit button during streaming) --- */
.analysis-progress-card {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 24px;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-accent-light);
  transition: var(--transition-theme);
}

.progress-card__indicator {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
}

.progress-dot--pulsing {
  animation: pulse-dot 1.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.5); opacity: 0.4; }
}

.progress-card__body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.progress-card__label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.3;
}

.progress-card__step {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.3;
}

/* --- Progress Indicator (below form, with 3D ring loader) --- */
.progress-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  margin: 20px 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* --- 3D Orbiting Rings Loader (CSS-only, GPU-composited) --- */
.ring-loader {
  position: relative;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  perspective: 200px;
  transform-style: preserve-3d;
}

.ring-loader__ring {
  position: absolute;
  inset: 0;
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  opacity: 0.35;
  transform-style: preserve-3d;
  will-change: transform;
}

.ring-loader__ring--1 {
  animation: ring-orbit-1 2.4s linear infinite;
}

.ring-loader__ring--2 {
  animation: ring-orbit-2 3.2s linear infinite;
  border-color: var(--color-text-muted);
  opacity: 0.25;
}

@keyframes ring-orbit-1 {
  0%   { transform: rotateX(60deg) rotateZ(0deg); }
  100% { transform: rotateX(60deg) rotateZ(360deg); }
}

@keyframes ring-orbit-2 {
  0%   { transform: rotateX(-60deg) rotateY(20deg) rotateZ(0deg); }
  100% { transform: rotateX(-60deg) rotateY(20deg) rotateZ(-360deg); }
}

.ring-loader__dot {
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--color-accent);
}
.ring-loader__ring--2 .ring-loader__dot {
  background: var(--color-text-muted);
}

/* Keep old spinner for history-loading etc. */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Responsive: progress card on small screens */
@media (max-width: 480px) {
  .analysis-progress-card {
    padding: 12px 16px;
  }
  .progress-card__label {
    font-size: 0.88rem;
  }
  .progress-card__step {
    font-size: 0.78rem;
  }
  .ring-loader {
    width: 40px;
    height: 40px;
  }
  .ring-loader__dot {
    top: -3px;
    width: 7px;
    height: 7px;
    margin-left: -3px;
  }
}

/* 16. Empty State */
.empty-state { text-align: center; padding: 48px 24px; }
.empty-state__illustration { font-size: 3rem; margin-bottom: 16px; }
.empty-state h2 { font-size: 1.5rem; margin-bottom: 8px; }
.empty-state p {
  color: var(--color-text-muted);
  margin-bottom: 24px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.example-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 600px;
  margin: 0 auto;
}
.example-btn {
  font-size: 0.82rem;
  white-space: normal;
  text-align: left;
  line-height: 1.4;
  max-width: 280px;
}

/* 17. Login / Auth */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--color-bg);
}
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow-md);
}
.auth-header { text-align: center; margin-bottom: 24px; }
.auth-logo { font-size: 2.5rem; display: block; margin-bottom: 8px; }
.auth-header h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 4px; }
.auth-subtitle { font-size: 0.85rem; color: var(--color-text-muted); }

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}
.auth-tab {
  flex: 1;
  padding: 10px 0;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: var(--font-family);
}
.auth-tab.active,
.auth-tab:hover { color: var(--color-accent); }
.auth-tab.active { border-bottom-color: var(--color-accent); }

.auth-form { display: none; }
.auth-form.active { display: block; }
.auth-footer { text-align: center; margin-top: 20px; font-size: 0.85rem; }
.text-link { color: var(--color-accent); text-decoration: none; font-weight: 600; }
.text-link:hover { text-decoration: underline; }

/* 18. Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal--visible { opacity: 1; transform: translateY(0); }

/* 19. Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 20. Responsive Breakpoints */

/* ≤1024px */
@media (max-width: 1024px) {
  :root { --section-padding: 80px; --grid-gap: 24px; }
  .mobile-menu-btn { display: flex; }
  .sidebar-toggle { display: none; }
  .app-header__sidebar-gap,
  body:has(.history-sidebar--collapsed) .app-header__sidebar-gap,
  body:has(.history-sidebar--open) .app-header__sidebar-gap {
    width: auto;
    min-width: auto;
  }
  /* On mobile, sidebar never enters collapsed-rail mode */
  .history-sidebar--collapsed {
    width: 320px !important;
    min-width: 320px !important;
  }
  .history-sidebar--collapsed .history-sidebar__header .history-sidebar__header-expanded {
    display: flex !important;
  }
  .history-sidebar--collapsed .history-sidebar__list { visibility: visible; overflow: auto; }
  .history-sidebar--collapsed .history-sidebar__header-collapsed { display: none; }
  .history-sidebar--collapsed .credit-badge,
  .history-sidebar--collapsed .history-sidebar__footer .btn {
    overflow: visible !important;
    white-space: normal;
  }
  .history-sidebar--collapsed .credit-badge {
    width: auto !important;
    padding: 6px 14px !important;
    justify-content: center;
  }
  .history-sidebar--collapsed .history-sidebar__footer .btn {
    width: 100% !important;
    padding: 6px 16px !important;
    justify-content: center;
  }
  .history-sidebar--collapsed .history-sidebar__footer { padding: 16px 20px 24px; gap: 12px; }
  .history-sidebar--collapsed .footer-label { display: inline; }
}

/* ≤768px */
@media (max-width: 768px) {
  :root { --section-padding: 72px; --card-padding: 24px; }
  .app-body { flex-direction: column; }
  .analysis-main { padding: 20px 16px; }
}

/* ≤480px */
@media (max-width: 480px) {
  :root { --container-padding: 16px; }
  .auth-card { padding: 24px 20px; }
  .btn-group { flex-direction: column; }
}

/* 21. Print Styles */
@media print {
  .app-header, .history-sidebar, .btn, .progress-indicator, #analysis-indicator {
    display: none !important;
  }
  .app-body { display: block; }
  .analysis-main { max-width: 100%; padding: 0; }
  body { background: #fff; color: #000; }
}