/* ========================================
   RuiHu AI API Distribution Platform
   Global Stylesheet
   Brand: Deep Blue #1E3A5F + Orange #F59E0B
   ======================================== */

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

:root {
  --color-primary: #1E3A5F;
  --color-primary-light: #2a5283;
  --color-primary-dark: #152841;
  --color-accent: #F59E0B;
  --color-accent-light: #fbbf24;
  --color-accent-dark: #d97706;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #1E3A5F;
  --color-text: #1a1a2e;
  --color-text-light: #64748b;
  --color-text-white: #ffffff;
  --color-border: #e2e8f0;
  --color-danger: #dc2626;
  --color-success: #16a34a;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 48px rgba(30, 58, 95, 0.15);
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1200px;
  --header-height: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img {
  max-width: 100%;
  display: block;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.main-content {
  flex: 1 0 auto;
}

/* === Header / Navigation === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: var(--transition);
}

.nav-link:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-secondary {
  background: var(--color-primary);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 58, 95, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
  box-shadow: none !important;
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

/* === Language Switch === */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: 4px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text-light);
  font-family: inherit;
}

.lang-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* === Anti-fraud Warning === */
.anti-fraud {
  font-size: 0.75rem;
  color: var(--color-danger);
  margin-top: 6px;
  line-height: 1.4;
}

.anti-fraud-inline {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--color-danger);
  margin-left: 8px;
  vertical-align: middle;
}

/* === Hero Section === */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 80px 0 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(42, 82, 131, 0.4) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 1.15rem;
  opacity: 0.85;
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Section General === */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 1rem;
  color: var(--color-text-light);
}

/* === Price Table === */

/* 免费模型专区卡片 */
.free-model-section {
  max-width: 900px;
  margin: 0 auto 24px;
}

.free-model-card {
  position: relative;
  background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 50%, #fefce8 100%);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.15);
  overflow: hidden;
  transition: var(--transition);
  animation: freeCardFadeIn 0.5s ease;
}

.free-model-card:hover {
  box-shadow: 0 8px 32px rgba(245, 158, 11, 0.25);
  transform: translateY(-2px);
}

.free-model-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* HOT 角标 */
.free-model-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 0 var(--radius-lg) 0 var(--radius);
  letter-spacing: 0.05em;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
  animation: badgePulse 2s ease-in-out infinite;
}

/* 价格表内联免费标签 */
.free-tag {
  display: inline-block;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius);
  margin-left: 8px;
  vertical-align: middle;
  white-space: nowrap;
}

/* 卡片头部 */
.free-model-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.free-model-icon {
  font-size: 2.2rem;
  flex-shrink: 0;
  animation: giftBounce 2.5s ease-in-out infinite;
}

.free-model-info {
  flex: 1;
  min-width: 0;
}

.free-model-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.free-model-subtitle {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.4;
}

/* 价格行 */
.free-model-price-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.free-model-price {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent-dark);
  background: rgba(245, 158, 11, 0.1);
  padding: 6px 20px;
  border-radius: var(--radius);
}

.free-model-rate-limit {
  font-size: 0.78rem;
  color: var(--color-text-light);
  background: rgba(100, 116, 139, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

/* 动画 */
@keyframes freeCardFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

@keyframes giftBounce {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-4px) rotate(-5deg); }
  75% { transform: translateY(-2px) rotate(5deg); }
}

.price-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  background: #fff;
  margin: 0 auto;
  max-width: 900px;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 600px;
}

.price-table thead {
  background: var(--color-primary);
}

.price-table thead th {
  color: #fff;
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.price-table thead th .th-en {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 2px;
}

.price-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.price-table tbody tr:hover {
  background: var(--color-bg-alt);
}

.price-table tbody tr:last-child {
  border-bottom: none;
}

.price-table tbody td {
  padding: 14px 20px;
  color: var(--color-text);
}

.price-table .price-cell {
  font-weight: 700;
  color: var(--color-accent-dark);
}

/* 价格加载 loading 动画 */
.price-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

/* === Trust Badges === */
.trust-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.trust-badge {
  text-align: center;
  padding: 32px 24px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.trust-badge:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.trust-badge .badge-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.trust-badge h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.trust-badge p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* === Footer === */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 32px 0;
  flex-shrink: 0;
}

.footer-content {
  text-align: center;
  font-size: 0.8rem;
  line-height: 1.8;
}

.footer-content p {
  margin: 2px 0;
}

.footer-content .footer-en {
  opacity: 0.6;
  margin-top: 6px;
}

/* === Agreement Modal === */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-box {
  transform: translateY(0);
}

.modal-header {
  padding: 24px 28px 16px;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
}

.modal-header .modal-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

.modal-body {
  padding: 24px 28px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text);
}

.modal-body .terms-zh,
.modal-body .terms-en {
  margin-bottom: 20px;
}

.modal-body .terms-label {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  display: block;
}

.modal-body .terms-text {
  color: var(--color-text-light);
}

.modal-footer {
  padding: 16px 28px 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
}

.modal-footer .btn {
  min-width: 200px;
}

/* === Tutorial Page === */
.tutorial-section {
  padding: 64px 0;
}

.tutorial-steps {
  max-width: 760px;
  margin: 0 auto;
}

.tutorial-step {
  display: flex;
  gap: 24px;
  margin-bottom: 48px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.step-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 18px;
  margin-bottom: 10px;
}

.step-content p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.step-screenshot {
  width: 100%;
  min-height: 180px;
  background: var(--color-bg-alt);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

/* === Product Definition Block (GEO structured) === */
.product-definition {
  padding: 24px 0 8px;
}

.definition-block {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 28px;
  border-left: 4px solid var(--color-accent);
  background: rgba(245, 158, 11, 0.06);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.definition-block p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0;
}

/* === FAQ Block (GEO structured) === */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  padding: 0;
}

.faq-item {
  margin-bottom: 24px;
  padding: 20px 28px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--color-accent);
}

.faq-item dt {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
  line-height: 1.5;
}

.faq-item dd {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin: 0;
}

/* === Quick Start Steps (GEO structured) === */
.quickstart-steps {
  list-style: none;
  counter-reset: step;
  max-width: 680px;
  margin: 0 auto 32px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.quickstart-steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 56px;
  min-height: 40px;
}

.quickstart-steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quickstart-steps > li h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-text);
}

.quickstart-steps > li p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* === Content Text (GEO expanded content) === */
.content-text {
  max-width: 760px;
  margin: 0 auto;
}

.content-text p {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* === Capability Detail === */
.cap-detail {
  font-size: 0.85rem !important;
  color: var(--color-text-light) !important;
  line-height: 1.7;
  margin-top: 8px;
}

/* === Quick Start Prerequisites === */
.quickstart-prereq {
  max-width: 680px;
  margin: 0 auto 28px;
}

.quickstart-prereq h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  margin-top: 16px;
}

.quickstart-prereq h3:first-child {
  margin-top: 0;
}

.quickstart-prereq p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin: 0;
}

/* === Tutorial Intro === */
.tutorial-intro {
  max-width: 760px;
  margin: 0 auto 32px;
  padding: 20px 28px;
  background: var(--color-bg-alt, #f8f9fa);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-primary);
}

.tutorial-intro h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.tutorial-intro p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin: 0;
}

/* === Parameter List (Tutorial Step 2) === */
.param-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 20px;
  max-width: 680px;
}

.param-list li {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border, #e8e8e8);
}

.param-list li:last-child {
  border-bottom: none;
}

.param-list li strong {
  color: var(--color-text);
  font-family: 'Courier New', monospace;
}

/* === Feature List (GEO structured) === */
.feature-list {
  list-style: none;
  max-width: 760px;
  margin: 0 auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-list > li {
  padding: 14px 18px;
  background: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-light);
}

.feature-list > li strong {
  color: var(--color-text);
  font-weight: 700;
}

/* === Tutorial Prereq & Next Steps === */
.tutorial-prereq,
.tutorial-next {
  max-width: 760px;
  margin: 32px auto;
  padding: 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

.tutorial-prereq h2,
.tutorial-next h2 {
  font-size: 1.2rem;
  color: var(--color-text);
  margin: 0 0 12px;
}

.tutorial-prereq p,
.tutorial-next p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 14px;
}

/* === Footer Update Date === */
.footer-update {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 8px;
  opacity: 0.8;
}

/* === Bottom CTA Heading === */
#bottom-cta h2 {
  font-size: 1.6rem;
  color: var(--color-text);
  margin-bottom: 20px;
}

/* === Code Block === */
.code-block {
  background: #1a1a2e;
  border-radius: var(--radius);
  padding: 20px 24px;
  overflow-x: auto;
  position: relative;
  margin-bottom: 16px;
}

.code-block pre {
  margin: 0;
}

.code-block code {
  font-family: "Fira Code", "Consolas", "Monaco", monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: #e2e8f0;
  white-space: pre;
}

.code-block .copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 6px 14px;
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.code-block .copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.code-block .copy-btn.copied {
  background: var(--color-success);
  border-color: var(--color-success);
}

/* === Tutorial CTA === */
.tutorial-cta {
  text-align: center;
  padding: 48px 24px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-lg);
  margin-top: 24px;
}

.tutorial-cta h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 24px;
}

/* === Recharge Page === */
.recharge-page {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: 40px 24px;
}

.recharge-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.recharge-spinner {
  width: 56px;
  height: 56px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 24px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.recharge-card h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.recharge-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.recharge-manual {
  display: none;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.recharge-manual.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.recharge-manual p {
  margin-bottom: 16px;
}

.recharge-manual a {
  color: var(--color-accent-dark);
  font-weight: 600;
  word-break: break-all;
}

/* === Mobile Menu === */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Responsive === */
@media (max-width: 900px) {
  .hero h1 {
    font-size: 1.9rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .trust-badges {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section-title h2 {
    font-size: 1.6rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .nav-link-desktop {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-right {
    gap: 8px;
  }

  .nav-right .btn {
    padding: 8px 16px;
    font-size: 0.82rem;
  }

  .logo {
    font-size: 0.85rem;
  }

  .logo-icon {
    width: 32px;
    height: 32px;
    font-size: 0.95rem;
  }

  .lang-switch {
    padding: 3px;
  }

  .lang-btn {
    padding: 3px 8px;
    font-size: 0.72rem;
  }

  .hero {
    padding: 56px 0 48px;
  }

  .hero h1 {
    font-size: 1.55rem;
  }

  .hero-subtitle {
    font-size: 0.92rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .section {
    padding: 48px 0;
  }

  .section-title h2 {
    font-size: 1.4rem;
  }

  .section-title {
    margin-bottom: 32px;
  }

  .trust-badge {
    padding: 24px 20px;
  }

  .trust-badge .badge-icon {
    font-size: 2rem;
  }

  .modal-box {
    max-height: 80vh;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  .tutorial-step {
    gap: 16px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }

  .tutorial-cta {
    padding: 32px 20px;
  }

  .tutorial-cta h2 {
    font-size: 1.2rem;
  }

  .recharge-card {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 0.78rem;
  }

  .nav-right .btn {
    padding: 7px 12px;
    font-size: 0.76rem;
  }

  .lang-btn {
    padding: 3px 6px;
    font-size: 0.68rem;
  }

  .hero h1 {
    font-size: 1.35rem;
  }

  .free-model-card {
    padding: 20px 16px;
  }

  .free-model-name {
    font-size: 1.1rem;
  }

  .free-model-price {
    font-size: 1.25rem;
  }

  .free-model-icon {
    font-size: 1.8rem;
  }

  .code-block {
    padding: 16px;
  }

  .code-block code {
    font-size: 0.78rem;
  }
}

/* ========================================
   NEW: Auth & Token Modal Styles
   ======================================== */

/* Auth Modal */
.auth-box {
  max-width: 420px !important;
}

.modal-close-btn {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  font-family: inherit;
}
.modal-close-btn:hover { color: var(--color-text); }

.auth-form {
  padding: 8px 28px 24px;
}

.auth-form .form-group {
  margin-bottom: 16px;
}

.auth-form .form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.auth-form .form-group input,
.token-create-form .form-group input,
.token-create-form .form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: #fff;
  color: var(--color-text);
}
.auth-form .form-group input:focus,
.token-create-form .form-group input:focus,
.token-create-form .form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(245,158,11,0.1);
}

.password-hint {
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.auth-switch-text {
  text-align: center;
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}
.auth-switch-text a {
  color: var(--color-accent-dark);
  font-weight: 600;
}

/* Token Modal */
.token-box {
  max-width: 740px !important;
  max-height: 85vh;
}

.token-create-section {
  padding: 12px 28px 8px;
  border-bottom: 1px solid var(--color-border);
}
.token-create-section h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.token-form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

/* Capability Cards */
.capability-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.capability-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 18px 12px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.capability-card:hover {
  border-color: var(--color-accent);
  background: rgba(245, 158, 11, 0.05);
}

.capability-card.selected {
  border-color: var(--color-accent);
  background: rgba(245, 158, 11, 0.12);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
}

.capability-card .capability-icon {
  font-size: 2rem;
  line-height: 1;
}

.capability-card .capability-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
}

.capability-card .capability-model {
  font-size: 0.72rem;
  color: var(--color-text-light);
  font-family: monospace;
}

.token-create-form {
  margin-bottom: 8px;
}

.token-note {
  font-size: 0.72rem;
  color: var(--color-text-light);
  margin: 8px 0 0;
  padding: 8px 12px;
  background: #fffbeb;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.token-list-section {
  padding: 12px 28px 24px;
}
.token-list-section h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.token-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.token-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  min-width: 600px;
}

.token-table thead {
  background: var(--color-bg-alt);
}
.token-table thead th {
  padding: 10px 12px;
  text-align: left;
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.token-table tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.token-table tbody tr:hover { background: var(--color-bg-alt); }
.token-table tbody tr:last-child td { border-bottom: none; }

.token-empty {
  text-align: center;
  padding: 32px !important;
  color: var(--color-text-light);
  font-size: 0.85rem;
}

.key-masked {
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.82rem;
  background: var(--color-bg-alt);
  padding: 3px 8px;
  border-radius: 4px;
  color: var(--color-primary);
}

/* User Badge in Nav */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.user-badge {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.85rem;
  padding: 4px 10px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.user-balance {
  font-weight: 600;
  color: var(--color-accent-dark);
  font-size: 0.82rem;
  white-space: nowrap;
}

/* btn-accent (white text on accent bg for hero) */
.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(245,158,11,0.3);
}

/* Toast Container */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 380px;
  pointer-events: none;
}

.toast-item {
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: auto;
  word-break: break-word;
}
.toast-item.show {
  transform: translateX(0);
  opacity: 1;
}
.toast-ok { background: var(--color-success); }
.toast-err { background: var(--color-danger); }
.toast-info { background: var(--color-primary); }

/* Small spinner for inline use */
.spinner-sm {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

/* Free model CTA button */
.free-cta-btn {
  margin-left: auto;
  flex-shrink: 0;
}

/* Copy button in token list */
.copy-key-btn {
  margin-left: 8px;
  font-size: 0.7rem !important;
  padding: 2px 8px !important;
}

/* Donate Modal */
.donate-box {
  max-width: 520px !important;
}

.donate-body {
  padding: 0 28px 8px;
}

.donate-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  justify-content: center;
}

.donate-tab {
  padding: 10px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text-light);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
}

.donate-tab.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.donate-tab:hover:not(.active) {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.donate-qr-wrapper {
  position: relative;
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.donate-qr {
  display: none;
  text-align: center;
}

.donate-qr.active {
  display: block;
}

.donate-qr img {
  width: 220px;
  height: 220px;
  border-radius: var(--radius);
  border: 2px solid var(--color-border);
  object-fit: contain;
  background: #fff;
}

.donate-qr-label {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.donate-placeholder {
  width: 220px;
  height: 220px;
  margin: 0 auto;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  background: var(--color-bg-alt);
}

.donate-placeholder-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}

.donate-placeholder p {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.donate-placeholder small {
  font-size: 0.72rem;
  line-height: 1.5;
  text-align: center;
}

/* Auth/Token modal responsive */
@media (max-width: 600px) {
  .auth-box,
  .token-box,
  .donate-box {
    max-width: 95% !important;
    margin: 10px;
  }
  .auth-form {
    padding: 8px 16px 20px;
  }
  .token-create-section,
  .token-list-section {
    padding: 8px 16px 16px;
  }
  .token-form-row {
    flex-direction: column;
  }
  .capability-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-menu {
    gap: 6px;
  }
  .user-badge {
    font-size: 0.75rem;
    padding: 3px 8px;
  }
  .user-balance {
    font-size: 0.72rem;
  }
  .nav-menu .btn-sm {
    padding: 5px 10px;
    font-size: 0.72rem;
  }
}