/* ========================
   律健AI品牌官网样式
   版本: 1.0.0
======================== */

/* ---- 变量 ---- */
:root {
    --primary: #5B4DFF;
    --primary-light: #8C7BFF;
    --primary-dark: #4338CA;
    --secondary: #3B82F6;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --dark: #1F2937;
    --gray-900: #111827;
    --gray-800: #1F2937;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 24px rgba(0,0,0,0.1);
    --shadow-primary: 0 8px 24px rgba(91,77,255,0.25);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--gray-700);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
    outline: none;
    border: none;
    background: none;
}

button {
    cursor: pointer;
}

/* ---- 容器 ---- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
    cursor: pointer;
    border: 1.5px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(91,77,255,0.35);
}

.btn-secondary {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* ---- 导航 ---- */
.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 transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    position: relative;
    padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transition: var(--transition);
    border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 6px;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-800);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
    background: linear-gradient(180deg, #F8F7FF 0%, var(--white) 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-light), #C4B5FD);
    top: -10%;
    right: -5%;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #A5B4FC, var(--primary));
    bottom: -10%;
    left: -10%;
    opacity: 0.3;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--secondary), #93C5FD);
    top: 40%;
    right: 20%;
    opacity: 0.2;
}

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

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--gray-900);
    margin-bottom: 20px;
}

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

.hero-desc {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.75;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    display: inline-flex;
    padding: 6px 14px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 100px;
    font-size: 0.8125rem;
    color: var(--gray-600);
    font-weight: 500;
}

.hero-visual {
    position: relative;
    height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: var(--shadow-lg);
    width: 320px;
}

.card-float {
    animation: float 6s ease-in-out infinite;
}

.card-float-delay {
    position: absolute;
    right: 0;
    top: 50px;
    width: 280px;
    animation: float 6s ease-in-out 1.5s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.chat-bubble {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.chat-bubble:last-child {
    margin-bottom: 0;
}

.chat-bubble-reply {
    flex-direction: row-reverse;
}

.chat-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chat-content {
    background: var(--gray-50);
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    border-bottom-left-radius: 4px;
    font-size: 0.875rem;
    color: var(--gray-700);
    line-height: 1.5;
}

.chat-bubble-reply .chat-content {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: 4px;
}

.doc-preview {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
}

.doc-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.doc-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.doc-dot.red { background: #EF4444; }
.doc-dot.yellow { background: #F59E0B; }
.doc-dot.green { background: #10B981; }

.doc-title {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-left: 6px;
}

.doc-body {
    padding: 12px;
}

.doc-line {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    margin-bottom: 8px;
    width: 100%;
}

.doc-line.short {
    width: 60%;
}

.doc-highlight {
    background: #FEF3C7;
    color: #92400E;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    margin: 8px 0;
    font-weight: 500;
}

/* ---- 公共区标题 ---- */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(91,77,255,0.08), rgba(140,123,255,0.08));
    color: var(--primary);
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
    line-height: 1.3;
}

.section-desc {
    font-size: 1rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ---- 统计 ---- */
.stats {
    padding: 60px 0;
    background: var(--white);
    border-top: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 16px;
}

.stat-number {
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
    font-family: "DIN Alternate", Roboto, sans-serif;
}

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

/* ---- 核心功能 ---- */
.features {
    padding: 100px 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.icon-purple { background: linear-gradient(135deg, #EDE9FE, #DDD6FE); color: var(--primary); }
.icon-blue { background: linear-gradient(135deg, #DBEAFE, #BFDBFE); color: var(--secondary); }
.icon-green { background: linear-gradient(135deg, #D1FAE5, #A7F3D0); color: var(--success); }
.icon-orange { background: linear-gradient(135deg, #FEF3C7, #FDE68A); color: #D97706; }
.icon-cyan { background: linear-gradient(135deg, #CFFAFE, #A5F3FC); color: #0891B2; }
.icon-pink { background: linear-gradient(135deg, #FCE7F3, #FBCFE8); color: #DB2777; }

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.feature-card > p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-list li {
    font-size: 0.875rem;
    color: var(--gray-600);
    padding-left: 18px;
    position: relative;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-light);
}

/* ---- 服务场景 ---- */
.scenarios {
    padding: 100px 0;
    background: var(--white);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.scenario-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-xl);
    padding: 28px;
    transition: var(--transition);
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.scenario-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.scenario-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.scenario-card > p {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 16px;
}

.scenario-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.scenario-tags span {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: var(--gray-50);
    color: var(--gray-600);
    border-radius: 100px;
    border: 1px solid var(--gray-100);
}

/* ---- 使用流程 ---- */
.workflow {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.step-card {
    flex: 1;
    max-width: 320px;
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    text-align: center;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.step-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: var(--shadow-primary);
}

.step-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, #EDE9FE, #DDD6FE);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 16px auto 20px;
}

.step-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.step-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.step-connector {
    width: 48px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-light), var(--primary));
    flex-shrink: 0;
    position: relative;
}

.step-connector::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid var(--primary);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
}

/* ---- 客户案例 ---- */
.cases {
    padding: 100px 0;
    background: var(--white);
}

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

.case-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: var(--transition);
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.case-tag {
    font-size: 0.75rem;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(91,77,255,0.08), rgba(140,123,255,0.08));
    color: var(--primary);
    border-radius: 100px;
    font-weight: 600;
}

.case-time {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

.case-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.case-card > p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.75;
    margin-bottom: 20px;
}

.case-result {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
}

.result-label {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

.result-value {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--primary);
    margin-right: 16px;
}

/* ---- 会员 ---- */
.membership {
    padding: 100px 0;
    background: linear-gradient(180deg, #F8F7FF 0%, var(--white) 100%);
}

.plans-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 960px;
    margin: 0 auto;
}

.plan-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.plan-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.plan-recommended {
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
    transform: scale(1.03);
}

.plan-recommended:hover {
    transform: scale(1.03) translateY(-4px);
}

.plan-badge {
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 16px;
    border-radius: 0 0 var(--radius) var(--radius);
}

.plan-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 8px;
    font-family: "DIN Alternate", Roboto, sans-serif;
}

.plan-price span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-400);
}

.plan-desc {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 24px;
}

.plan-features {
    text-align: left;
    margin-bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.plan-features li {
    font-size: 0.9375rem;
    color: var(--gray-600);
    padding-left: 24px;
    position: relative;
}

.plan-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    width: 16px;
    height: 16px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235B4DFF' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
}

/* ---- 联系 ---- */
.contact {
    padding: 100px 0;
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 12px 0 16px;
}

.contact-info > p {
    font-size: 1rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 32px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, #EDE9FE, #DDD6FE);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    font-size: 0.9375rem;
    color: var(--gray-900);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 0.9375rem;
    color: var(--gray-500);
}

.qr-placeholder {
    display: flex;
    align-items: center;
    gap: 16px;
}

.qr-box {
    width: 100px;
    height: 100px;
    border-radius: var(--radius);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-300);
}

.qr-placeholder p {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.faq-wrapper {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 36px;
    border: 1px solid var(--gray-100);
}

.faq-header {
    margin-bottom: 24px;
}

.faq-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.faq-header p {
    font-size: 0.9375rem;
    color: var(--gray-500);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(91,77,255,0.06);
}

.faq-item[open] {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(91,77,255,0.08);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-800);
    cursor: pointer;
    list-style: none;
    transition: var(--transition);
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::marker {
    display: none;
}

.faq-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.faq-question span:last-child {
    flex: 1;
    line-height: 1.5;
}

.faq-answer {
    padding: 0 20px 16px 60px;
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.75;
}

.faq-answer p {
    margin: 0;
}

/* ---- Footer ---- */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9375rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-links h4 {
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* ---- 回到顶部 ---- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    box-shadow: var(--shadow-primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-2px);
}

/* ---- 滚动动画 ---- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================
   响应式
======================== */

@media (max-width: 1024px) {
    .hero-title { font-size: 2.75rem; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr; }
    .plans-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { gap: 40px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .header-inner { height: 64px; }
    .nav { display: none; }
    .menu-toggle { display: flex; }
    .nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 16px 24px;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--gray-100);
        gap: 0;
    }
    .nav.open .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-100);
    }
    .nav.open .nav-link:last-child { border-bottom: none; }

    .hero {
        padding: 100px 0 60px;
    }
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .hero-title { font-size: 2rem; }
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    .hero-tags { justify-content: center; }
    .hero-visual { display: none; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-number { font-size: 2rem; }

    .features-grid { grid-template-columns: 1fr; }
    .scenarios-grid { grid-template-columns: 1fr; }
    .workflow-steps { flex-direction: column; }
    .step-connector {
        width: 2px;
        height: 32px;
    }
    .step-connector::after {
        right: 50%;
        top: auto;
        bottom: 0;
        transform: translateX(50%) rotate(90deg);
    }
    .plans-grid { grid-template-columns: 1fr; }
    .plan-recommended { transform: none; }
    .plan-recommended:hover { transform: translateY(-4px); }
    .contact-grid { grid-template-columns: 1fr; }

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

    .section-title { font-size: 1.75rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 1.75rem; }
    .btn-lg { padding: 12px 24px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .feature-card, .scenario-card, .case-card { padding: 24px; }
}