/*
Theme Name: 天小智AI
Theme URI: https://tianxiaozhiai.com
Author: 天小智AI
Author URI: https://tianxiaozhiai.com
Description: 天小智AI - GEO+SEO双引擎智能优化系统，国内首款同时覆盖传统搜索引擎和AI大模型搜索的优化方案主题。自适应设计，符合百度、Google SEO标准及GEO AI引用规范。
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: tianxiaozhiai-ai
Tags: one-column, custom-colors, custom-logo, featured-images, full-width-template, theme-options, translation-ready
*/

/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #7c3aed;
  --color-accent: #06b6d4;
  --color-accent-green: #10b981;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-bg-card: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-gradient-start: #2563eb;
  --color-gradient-end: #7c3aed;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.06);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }
h4 { font-size: clamp(1rem, 1.5vw, 1.25rem); }

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

.section {
  padding: 80px 0;
}

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

.section-dark {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1e293b 100%);
  color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  margin-bottom: 16px;
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.section-dark .section-label {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-light);
}

.section-dark .section-title {
  color: #ffffff;
}

.section-dark .section-desc {
  color: var(--color-text-light);
}

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.site-logo:hover {
  color: var(--color-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  background: none;
}
.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff !important;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  color: #ffffff !important;
}

.nav-cta::after {
  display: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.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);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  overflow: hidden;
  background: linear-gradient(135deg, #f0f7ff 0%, #ede9fe 50%, #f0fdfa 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 600px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  padding: 8px 18px;
  border-radius: 24px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 28px;
}

.hero-badge-icon {
  font-size: 1rem;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--color-bg-dark);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
  text-decoration: none;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  color: #ffffff;
}

.btn-secondary {
  background: #ffffff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  width: 100%;
  max-width: 480px;
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(0,0,0,0.04);
  position: relative;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-card-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.hero-card-dot:nth-child(1) { background: #ef4444; }
.hero-card-dot:nth-child(2) { background: #f59e0b; }
.hero-card-dot:nth-child(3) { background: #10b981; }

.hero-card-body {
  margin-bottom: 20px;
}

.hero-card-line {
  height: 10px;
  border-radius: 5px;
  margin-bottom: 12px;
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.hero-card-line::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  border-radius: 5px;
  animation: shimmer 2s ease-in-out infinite;
}

.hero-card-line:nth-child(1)::after {
  width: 85%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  animation-delay: 0s;
}

.hero-card-line:nth-child(2)::after {
  width: 70%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-green));
  animation-delay: 0.3s;
}

.hero-card-line:nth-child(3)::after {
  width: 92%;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-primary));
  animation-delay: 0.6s;
}

@keyframes shimmer {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

.hero-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-card-tag {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
}

.hero-card-tag.seo { background: rgba(37,99,235,0.08); color: var(--color-primary); }
.hero-card-tag.geo { background: rgba(124,58,237,0.08); color: var(--color-secondary); }
.hero-card-tag.ai { background: rgba(6,182,212,0.08); color: var(--color-accent); }

.hero-float-card {
  position: absolute;
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(0,0,0,0.04);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: float 3s ease-in-out infinite;
}

.hero-float-card.card-1 {
  top: 20px;
  right: -30px;
  animation-delay: 0s;
}

.hero-float-card.card-2 {
  bottom: 40px;
  left: -20px;
  animation-delay: 1.5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.float-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.float-icon.green { background: rgba(16,185,129,0.1); }
.float-icon.purple { background: rgba(124,58,237,0.1); }

.float-text {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
}

.float-sub {
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-weight: 400;
}

/* ============================================
   Features Section
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}

.feature-card:hover {
  border-color: rgba(37, 99, 235, 0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-icon.blue { background: rgba(37,99,235,0.08); }
.feature-icon.purple { background: rgba(124,58,237,0.08); }
.feature-icon.cyan { background: rgba(6,182,212,0.08); }

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--color-text);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.feature-tag {
  padding: 4px 12px;
  background: var(--color-bg-alt);
  border-radius: 16px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* ============================================
   Workflow Section
   ============================================ */
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.workflow-grid::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent), var(--color-accent-green));
  opacity: 0.3;
}

.workflow-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.workflow-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.workflow-step h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.workflow-step p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================
   Comparison Section (SEO vs GEO)
   ============================================ */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.comparison-card {
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.comparison-card.seo {
  background: linear-gradient(135deg, rgba(37,99,235,0.03) 0%, rgba(37,99,235,0.06) 100%);
  border-color: rgba(37,99,235,0.15);
}

.comparison-card.geo {
  background: linear-gradient(135deg, rgba(124,58,237,0.03) 0%, rgba(124,58,237,0.06) 100%);
  border-color: rgba(124,58,237,0.15);
}

.comparison-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.comparison-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.comparison-card .card-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.comparison-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.comparison-item .icon {
  flex-shrink: 0;
  font-size: 1rem;
  margin-top: 2px;
}

.comparison-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.platform-tag {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  background: rgba(255,255,255,0.7);
  color: var(--color-text-secondary);
  border: 1px solid rgba(0,0,0,0.06);
}

/* ============================================
   Why Choose Section
   ============================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  justify-items: center;
}

.advantage-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.advantage-card:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.15);
}

.advantage-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(124,58,237,0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
  margin: 0 auto 16px;
}

.advantage-card h3 {
  color: #ffffff;
  font-size: 1.0625rem;
  margin-bottom: 10px;
}

.advantage-card p {
  color: var(--color-text-light);
  font-size: 0.875rem;
  line-height: 1.7;
}

/* ============================================
   Stats Section
   ============================================ */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item:hover {
  border-color: rgba(37, 99, 235, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  gap: 16px;
  transition: background 0.2s ease;
}

.faq-question:hover {
  background: var(--color-bg-alt);
}

.faq-toggle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.faq-item.active .faq-toggle {
  background: var(--color-primary);
  color: #ffffff;
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -80px;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.cta-inner h2 {
  color: #ffffff;
  margin-bottom: 16px;
}

.cta-inner p {
  color: rgba(255,255,255,0.8);
  font-size: 1.0625rem;
  margin-bottom: 32px;
  line-height: 1.7;
}

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

.btn-white {
  background: #ffffff;
  color: var(--color-primary);
  padding: 14px 36px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  transition: all 0.25s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  color: var(--color-primary-dark);
}

.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border: 2px solid rgba(255,255,255,0.5);
  padding: 12px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.25s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: #ffffff;
  color: #ffffff;
  transform: translateY(-1px);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.6);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-top: 16px;
  color: rgba(255,255,255,0.5);
}

.footer-heading {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.875rem;
  margin-bottom: 10px;
  color: rgba(255,255,255,0.5);
}

.footer-contact-item a {
  color: rgba(255,255,255,0.5);
}

.footer-contact-item a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.35);
}

.footer-icp {
  font-size: 0.8125rem;
}

.footer-icp a {
  color: rgba(255,255,255,0.35);
}

.footer-icp a:hover {
  color: rgba(255,255,255,0.6);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
    max-width: 400px;
    margin: 0 auto;
  }

  .hero-card {
    max-width: 100%;
    padding: 24px;
  }

  .hero-float-card {
    display: none;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .workflow-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .workflow-grid::before {
    display: none;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    display: flex;
  }

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

  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 40px;
  }

  .hero-visual {
    max-width: 320px;
  }

  .hero-card {
    padding: 20px;
  }

  .hero-card-line {
    height: 8px;
    margin-bottom: 10px;
  }

  .hero-card-tag {
    padding: 5px 10px;
    font-size: 0.75rem;
  }

  .hero-title {
    font-size: clamp(1.75rem, 6vw, 2.5rem);
  }

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

  .features-grid {
    grid-template-columns: 1fr;
  }

  .workflow-grid {
    grid-template-columns: 1fr;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .stat-number {
    font-size: 1.75rem;
  }
}

/* ============================================
   Contact Modal
   ============================================ */
.contact-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.contact-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.contact-modal-content {
  position: relative;
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 40px 36px 36px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s ease;
}

.contact-modal.active .contact-modal-content {
  transform: translateY(0) scale(1);
}

.contact-modal-close {
  position: absolute;
  top: 14px;
  right: 18px;
  background: none;
  border: none;
  font-size: 1.75rem;
  color: var(--color-text-light);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.2s ease, background 0.2s ease;
}

.contact-modal-close:hover {
  color: var(--color-text);
  background: var(--color-bg-alt);
}

.contact-modal-content h3 {
  font-size: 1.375rem;
  margin-bottom: 8px;
}

.contact-modal-desc {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 28px;
}

.contact-modal-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.contact-modal-qrcode {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  padding: 12px;
  background: var(--color-bg-alt);
}

.contact-modal-qrcode img {
  display: block;
  border-radius: 4px;
}

.contact-modal-qrcode-placeholder {
  width: 180px;
  height: 180px;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.6;
  padding: 16px;
}

.contact-modal-phone {
  display: flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, rgba(37,99,235,0.06), rgba(124,58,237,0.06));
  border: 1px solid rgba(37,99,235,0.12);
  padding: 14px 24px;
  border-radius: var(--radius-md);
  width: 100%;
  justify-content: center;
}

.contact-modal-phone svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-modal-phone a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.contact-modal-phone a:hover {
  color: var(--color-primary-dark);
}

@media (max-width: 480px) {
  .contact-modal-content {
    padding: 32px 20px 28px;
  }
}

/* ============================================
   Accessibility
   ============================================ */
.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute !important;
  width: 1px;
  word-wrap: normal !important;
}

.screen-reader-text:focus {
  background-color: #f1f1f1;
  border-radius: 3px;
  box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
  clip: auto !important;
  clip-path: none;
  color: #21759b;
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  height: auto;
  left: 5px;
  line-height: normal;
  padding: 15px 23px 14px;
  text-decoration: none;
  top: 5px;
  width: auto;
  z-index: 100000;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   Print styles
   ============================================ */
@media print {
  .site-header,
  .hero-visual,
  .mobile-menu-toggle,
  .cta-section,
  .site-footer {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  .hero {
    min-height: auto;
    padding: 20px 0;
  }
}