/* ============================================
   ALLCITI HELP CENTER — STYLES
   Dark streaming theme, large text for older users
   ============================================ */

/* --- Design Tokens --- */
:root,
[data-theme='light'] {
  --text-xs: clamp(0.875rem, 0.82rem + 0.25vw, 1rem);
  --text-sm: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-base: clamp(1.125rem, 1.05rem + 0.5vw, 1.25rem);
  --text-lg: clamp(1.375rem, 1.2rem + 0.75vw, 1.75rem);
  --text-xl: clamp(1.75rem, 1.4rem + 1.25vw, 2.5rem);
  --text-2xl: clamp(2.25rem, 1.5rem + 2.5vw, 3.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Light mode colors */
  --color-bg: #f5f6fa;
  --color-surface: #ffffff;
  --color-surface-2: #f0f1f6;
  --color-surface-offset: #e8eaf0;
  --color-border: #d4d7e0;
  --color-divider: #e0e3ea;
  --color-text: #1a1f3a;
  --color-text-muted: #5a6378;
  --color-text-faint: #8a92a6;
  --color-primary: #e8820e;
  --color-primary-hover: #d07408;
  --color-primary-light: #fff4e6;
  --color-accent: #3b4cca;
  --color-accent-light: #e8ebf5;
  --color-success: #1a7a3a;
  --color-success-light: #e6f5ec;
  --color-warning: #b54708;
  --color-warning-light: #fff4e6;
  --color-danger: #b91c1c;
  --color-danger-light: #fee2e2;
  --color-info: #1d4ed8;
  --color-info-light: #e0e7ff;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  --shadow-sm: 0 1px 3px rgba(26, 31, 58, 0.1);
  --shadow-md: 0 4px 12px rgba(26, 31, 58, 0.12);
  --shadow-lg: 0 12px 32px rgba(26, 31, 58, 0.16);

  --font-body: 'Plus Jakarta Sans', 'Segoe UI', sans-serif;

  --content-max: 860px;
  --content-wide: 1100px;
}

[data-theme='dark'] {
  --color-bg: #0f1120;
  --color-surface: #181b2e;
  --color-surface-2: #1e2238;
  --color-surface-offset: #232842;
  --color-border: #2e3454;
  --color-divider: #262b44;
  --color-text: #e8eaf6;
  --color-text-muted: #9ca4c0;
  --color-text-faint: #6a7090;
  --color-primary: #f5a623;
  --color-primary-hover: #ffb84d;
  --color-primary-light: #2a2010;
  --color-accent: #6b7fff;
  --color-accent-light: #1a1f3a;
  --color-success: #34d399;
  --color-success-light: #0f2a1f;
  --color-warning: #fbbf24;
  --color-warning-light: #2a2010;
  --color-danger: #f87171;
  --color-danger-light: #2a1010;
  --color-info: #60a5fa;
  --color-info-light: #0f1a2a;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
}

img, video { display: block; max-width: 100%; height: auto; }

a, button, [role='button'] {
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.logo-mark {
  display: flex;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  text-align: left;
  line-height: 1.2;
}

.logo-name {
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme='dark'] .theme-toggle .icon-sun { display: block; }
[data-theme='dark'] .theme-toggle .icon-moon { display: none; }

/* --- Main --- */
main {
  flex: 1;
  width: 100%;
}

/* --- Home Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-2) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-16) var(--space-6);
  text-align: center;
}

.hero-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

.hero p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin: 0 auto;
}

/* --- Category Section --- */
.category-section {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

.section-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.section-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: var(--space-6);
}

.category-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.category-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.category-card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.category-card p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  flex: 1;
}

.category-card .card-arrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-base);
}

/* --- Guide Grid --- */
.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

@media (min-width: 640px) {
  .guide-grid {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }
}

.guide-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.guide-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.guide-card-device {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
}

.guide-card h4 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.guide-card p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  flex: 1;
}

.guide-card .card-arrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-sm);
  margin-top: var(--space-2);
}

/* --- Guide Detail Page --- */
.guide-detail {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  font-weight: 500;
  margin-bottom: var(--space-8);
}

.back-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.guide-detail .device-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.guide-detail h1 {
  font-size: var(--text-xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.guide-detail .guide-intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

/* --- Video Embed --- */
.video-container {
  position: relative;
  width: 100%;
  margin-bottom: var(--space-10);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.video-container::after {
  content: '';
  display: block;
  padding-bottom: 56.25%;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* --- Callout Boxes --- */
.callout {
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-6);
  border-left: 4px solid;
  font-size: var(--text-base);
  line-height: 1.65;
}

.callout-title {
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.callout p { font-size: var(--text-base); color: var(--color-text); }
.callout p + p { margin-top: var(--space-3); }

.callout-info {
  background: var(--color-info-light);
  border-color: var(--color-info);
}
.callout-info .callout-title { color: var(--color-info); }

.callout-warning {
  background: var(--color-warning-light);
  border-color: var(--color-warning);
}
.callout-warning .callout-title { color: var(--color-warning); }

.callout-danger {
  background: var(--color-danger-light);
  border-color: var(--color-danger);
}
.callout-danger .callout-title { color: var(--color-danger); }

.callout-success {
  background: var(--color-success-light);
  border-color: var(--color-success);
}
.callout-success .callout-title { color: var(--color-success); }

/* --- Steps --- */
.steps-section {
  margin-bottom: var(--space-10);
}

.steps-section h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.step-list {
  list-style: none;
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.step-item {
  counter-increment: step-counter;
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--text-base);
}

[data-theme='dark'] .step-number {
  color: #0f1120;
}

.step-content {
  flex: 1;
  padding-top: var(--space-1);
}

.step-content p {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
}

.step-content p + p { margin-top: var(--space-3); }

.step-content strong { color: var(--color-text); font-weight: 700; }

.step-content .step-tip {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-left: 3px solid var(--color-border);
}

/* --- Troubleshooting --- */
.troubleshoot-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-10);
}

.troubleshoot-section h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.troubleshoot-item {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
}

.troubleshoot-item:last-child { border-bottom: none; padding-bottom: 0; }
.troubleshoot-item:first-child { padding-top: 0; }

.troubleshoot-item h4 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.troubleshoot-item p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* --- Remote Glossary --- */
.glossary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 580px) {
  .glossary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.glossary-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.glossary-item .btn-name {
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.glossary-item .btn-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

/* --- FAQ Section on Home --- */
.faq-section {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

.faq-section h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
  text-align: center;
}

.faq-item {
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-5) 0;
}

.faq-item summary {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}
.faq-item[open] summary::after { content: '\2212'; }

.faq-item p {
  margin-top: var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- Quick Links Section --- */
.quick-links {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-16);
}

.quick-links h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  text-align: center;
}

.quick-link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 200px), 1fr));
  gap: var(--space-4);
}

.quick-link {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  text-align: center;
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.quick-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) var(--space-6);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.footer-note {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-copy {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  z-index: 90;
  transition: opacity 200ms ease, transform 200ms ease;
}

[data-theme='dark'] .back-to-top { color: #0f1120; }

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover { transform: translateY(-3px); }

/* --- Mobile Adjustments --- */
@media (max-width: 480px) {
  .hero { padding: var(--space-10) var(--space-4); }
  .category-section { padding: var(--space-8) var(--space-4); }
  .guide-detail { padding: var(--space-6) var(--space-4) var(--space-12); }
  .header-inner { padding: var(--space-3) var(--space-4); }
  .step-item { gap: var(--space-3); }
  .step-number { width: 36px; height: 36px; font-size: var(--text-sm); }
  .callout { padding: var(--space-4); }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* --- Step Bullet Lists --- */
.step-bullets {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.step-bullets li {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  padding-left: var(--space-5);
  position: relative;
}
.step-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}
.step-bullets li strong { font-weight: 700; }

/* --- Device Label Badge (within steps) --- */
.device-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.device-label.fire {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.device-label.google {
  background: var(--color-accent-light);
  color: var(--color-accent);
}
[data-theme='dark'] .device-label.fire {
  background: rgba(232, 130, 14, 0.15);
  color: var(--color-primary);
}
[data-theme='dark'] .device-label.google {
  background: rgba(59, 76, 202, 0.15);
  color: #8b9aff;
}

/* --- Step Section Header (for Round 1, Round 2, etc.) --- */
.step-section-header {
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-primary);
  padding: var(--space-4) 0 var(--space-2) 0;
  border-top: 2px solid var(--color-divider);
  margin-top: var(--space-4);
}
.step-section-header:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* --- Start Here Badge --- */
.start-here-badge {
  display: inline-block;
  background: var(--color-success);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* --- Guide Device Illustration --- */
.guide-illustration {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}
.guide-illustration .device-illus {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.guide-illustration .device-illus svg {
  opacity: 0.85;
}
.guide-illustration .device-illus .illus-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* --- Step content improvements --- */
.step-content p { line-height: 1.65; }
.step-content .step-tip {
  border-left: 3px solid var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-text);
}
[data-theme='dark'] .step-content .step-tip {
  background: rgba(232, 130, 14, 0.08);
  border-left-color: var(--color-primary);
}

/* --- Guide intro improvement --- */
.guide-intro {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* --- Guide card improvements --- */
.guide-card h4 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.guide-card p {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-text-muted);
}