/* ============================================
   AI BOSS - AI企业平台
   KHB Website Design Standard V2.9
   统一品牌设计语言
   ============================================ */

:root {
    /* KHB 统一品牌色 */
    --bg-primary: #0A0E14;
    --bg-secondary: #111820;
    --bg-card: #161D28;
    --bg-card-hover: #1E2736;
    --border-color: #2A3545;
    --text-primary: #FFFFFF;
    --text-secondary: #CBD5E1;
    --text-muted: #8B98A9;
    --ai-blue: #3B82F6;
    --cta-orange: #F97316;
    
    /* 新增渐变色 */
    --gradient-blue: linear-gradient(135deg, #3B82F6 0%, #60A5FA 100%);
    --gradient-orange: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
    --gradient-dark: linear-gradient(180deg, #0A0E14 0%, #111820 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow-blue: 0 0 40px rgba(59, 130, 246, 0.3);
    --shadow-glow-orange: 0 0 40px rgba(249, 115, 22, 0.3);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    /* 字体 */
    --font-display: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 布局 */
    --max-width: 1200px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    font-weight: 400;
    font-size: 16px;
    letter-spacing: -0.01em;
}

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

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

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

ul, ol {
    list-style: none;
}

/* ========== 字体层级 ========== */
h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
}

p {
    font-size: 16px;
    line-height: 1.7;
}

.text-sm, small {
    font-size: 14px;
}

/* ========== 按钮样式 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 52px;
    padding: 0 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--gradient-blue);
    color: var(--text-primary);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--ai-blue);
    transform: translateY(-3px);
}

.btn-large {
    height: 60px;
    padding: 0 40px;
    font-size: 17px;
}

/* ========== 标签/徽章 ========== */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 2rem;
    letter-spacing: 0.5px;
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 10px;
    height: 10px;
    background: var(--ai-blue);
    border-radius: 50%;
    box-shadow: 0 0 16px var(--ai-blue);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

/* ========== 顶部导航 - 提升高度 ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 20, 0.9);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(42, 53, 69, 0.5);
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(10, 14, 20, 0.98);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
}

.brand img {
    height: 44px;
    width: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.brand-sub {
    font-size: 0.75rem;
    color: var(--cta-orange);
    letter-spacing: 2px;
    margin-top: 4px;
    text-transform: uppercase;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.3px;
    padding: 0.75rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--ai-blue);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-blue);
    transition: width 0.3s;
    border-radius: 2px;
}

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

.nav-cta {
    height: 48px !important;
    padding: 0 24px !important;
    background: var(--gradient-orange) !important;
    color: var(--text-primary) !important;
    border-radius: 8px !important;
    font-weight: 600 !important;
    font-size: 15px !important;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.4);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(249, 115, 22, 0.5);
}

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    width: 26px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 2px;
}

@media (max-width: 900px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-primary);
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
}

/* ========== HERO 区域 - 全屏动态 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 10rem 0 6rem;
    overflow: hidden;
    background: var(--bg-primary);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(249, 115, 22, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4) 0%, transparent 60%);
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-left {
    max-width: 640px;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
}

.hero-title .grad {
    background: linear-gradient(90deg, #FFFFFF 0%, #93C5FD 50%, #3B82F6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

/* Hero 右侧 - AI企业协同动画 */
.hero-right {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 500px;
}

.enterprise-animation {
    position: relative;
    width: 100%;
    max-width: 560px;
    height: 500px;
}

/* 中央任务卡片 */
.task-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(249, 115, 22, 0.1) 100%);
    border: 2px solid rgba(59, 130, 246, 0.4);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 60px rgba(59, 130, 246, 0.3), inset 0 0 40px rgba(59, 130, 246, 0.1);
    z-index: 10;
    animation: centerPulse 3s ease-in-out infinite;
}

@keyframes centerPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.05); }
}

.task-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.task-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    padding: 0 1rem;
    line-height: 1.4;
}

/* 周围组织节点 */
.org-nodes {
    position: absolute;
    inset: 0;
}

.org-node {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.org-node:hover {
    transform: scale(1.1);
    border-color: var(--ai-blue);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.4);
}

.org-node.active {
    border-color: var(--ai-blue);
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.5);
    animation: nodeActive 0.6s ease-out;
}

@keyframes nodeActive {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.org-node-icon {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.org-node-name {
    font-size: 10px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.2;
}

/* 连接线 */
.connection-lines {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.connection-line {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, var(--ai-blue) 0%, transparent 100%);
    transform-origin: left center;
    opacity: 0;
    animation: lineFlow 2s ease-in-out infinite;
}

@keyframes lineFlow {
    0%, 100% { opacity: 0; }
    50% { opacity: 0.6; }
}

/* 状态标签 */
.status-tags {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 15;
}

.status-tag {
    position: absolute;
    padding: 6px 12px;
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid rgba(59, 130, 246, 0.4);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    color: var(--ai-blue);
    opacity: 0;
    animation: tagAppear 0.5s ease-out forwards;
    backdrop-filter: blur(10px);
}

@keyframes tagAppear {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 输出报告 */
.report-output {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 280px;
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.15) 0%, rgba(59, 130, 246, 0.1) 100%);
    border: 2px solid rgba(249, 115, 22, 0.4);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 8px 32px rgba(249, 115, 22, 0.3);
    opacity: 0;
    animation: reportAppear 0.6s ease-out forwards;
}

@keyframes reportAppear {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.report-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--cta-orange);
    letter-spacing: 1.5px;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.report-content {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.report-item {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-secondary);
}

.report-item.highlight {
    color: var(--cta-orange);
    font-weight: 700;
    font-size: 15px;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(249, 115, 22, 0.3);
    margin-top: 0.25rem;
}

@media (max-width: 900px) {
    .hero {
        min-height: auto;
        padding: 8rem 0 4rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-left {
        max-width: 100%;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        max-width: 100%;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-right {
        min-height: 400px;
    }
    
    .enterprise-animation {
        height: 400px;
    }
}

/* ========== 通用 Section 样式 ========== */
.section {
    padding: 8rem 0;
    position: relative;
}

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

.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 5rem;
    padding: 0 2rem;
}

.kicker {
    display: inline-block;
    font-size: 14px;
    font-weight: 700;
    color: var(--ai-blue);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
    padding: 8px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 6px;
}

.section-head h2 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
    background: linear-gradient(90deg, #FFFFFF 0%, #CBD5E1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-head p {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== 对比样式 ========== */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 2rem;
}

.compare-left,
.compare-right {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    transition: var(--transition);
}

.compare-left:hover,
.compare-right:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.compare-left {
    border-color: rgba(139, 152, 169, 0.3);
}

.compare-right {
    border-color: rgba(59, 130, 246, 0.5);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, var(--bg-card) 100%);
    box-shadow: 0 8px 40px rgba(59, 130, 246, 0.15);
}

.compare-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.compare-icon {
    font-size: 2.5rem;
}

.compare-header h3 {
    font-size: 24px;
    font-weight: 600;
}

.compare-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
    border-bottom: 1px solid rgba(42, 53, 69, 0.5);
}

.compare-item:last-child {
    border-bottom: none;
}

.compare-item.highlight {
    background: rgba(59, 130, 246, 0.08);
    margin: 0 -1rem;
    padding: 1.25rem 1rem;
    border-radius: 8px;
}

.item-label {
    font-size: 15px;
    color: var(--text-muted);
}

.item-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.compare-right .item-value {
    color: var(--ai-blue);
}

.why-bottom {
    text-align: center;
    padding: 2.5rem;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 16px;
    max-width: var(--max-width);
    margin: 4rem auto 0;
}

.why-text {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.why-text strong {
    color: var(--ai-blue);
    font-weight: 700;
}

@media (max-width: 768px) {
    .compare-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== AI组织矩阵 V2 - 企业架构视觉 ========== */
.org-matrix-v2 {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 中央脊柱 */
.matrix-spine {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    transform: translateX(-50%);
    z-index: 0;
}

.spine-line {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, 
        rgba(59, 130, 246, 0.1) 0%, 
        rgba(59, 130, 246, 0.4) 20%, 
        rgba(249, 115, 22, 0.4) 80%, 
        rgba(249, 115, 22, 0.1) 100%);
    border-radius: 4px;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.spine-pulse {
    position: absolute;
    left: 50%;
    top: 0;
    width: 8px;
    height: 100px;
    background: linear-gradient(180deg, transparent, var(--ai-blue), transparent);
    transform: translateX(-50%);
    animation: spineFlow 4s ease-in-out infinite;
    border-radius: 4px;
    box-shadow: 0 0 30px var(--ai-blue);
}

@keyframes spineFlow {
    0% { top: 0%; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

/* 层级容器 */
.matrix-tier {
    position: relative;
    margin-bottom: 3rem;
    z-index: 1;
}

.matrix-tier:last-child {
    margin-bottom: 0;
}

/* 层级连接器 */
.tier-connector {
    position: absolute;
    left: 50%;
    top: -3rem;
    width: 60px;
    height: 60px;
    transform: translateX(-50%);
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: connectorPulse 2s ease-in-out infinite;
}

@keyframes connectorPulse {
    0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.6; }
    50% { transform: translateX(-50%) scale(1.2); opacity: 1; }
}

/* 层级内容 */
.tier-content {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tier-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-blue);
    transform: scaleX(0);
    transition: transform 0.6s ease;
}

.tier-content:hover {
    border-color: var(--ai-blue);
    transform: translateY(-4px);
    box-shadow: 0 12px 48px rgba(59, 130, 246, 0.25);
}

.tier-content:hover::before {
    transform: scaleX(1);
}

/* 层级徽章 */
.tier-badge {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.tier-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.3));
}

.tier-label {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.tier-tag {
    margin-left: auto;
    padding: 6px 14px;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.4);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    color: var(--ai-blue);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

/* 层级卡片网格 */
.tier-cards {
    display: grid;
    gap: 1.25rem;
}

/* 各层网格列数 */
.tier-decision .tier-cards   { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
.tier-consulting .tier-cards { grid-template-columns: repeat(3, 1fr); }
.tier-professional .tier-cards { grid-template-columns: repeat(4, 1fr); }
.tier-marketing .tier-cards  { grid-template-columns: repeat(3, 1fr); }
.tier-execution .tier-cards  { grid-template-columns: repeat(2, 1fr); max-width: 440px; margin: 0 auto; }

/* 单个卡片 - 垂直居中布局 */
.tier-card {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    padding: 1.75rem 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
    transition: var(--transition);
    position: relative;
}

.tier-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--ai-blue);
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.2);
}

/* 决策层大卡片 */
.tier-card.card-single {
    padding: 2.5rem 2rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, var(--bg-secondary) 100%);
    border-color: rgba(59, 130, 246, 0.4);
    border-width: 2px;
    flex-direction: row;
    text-align: left;
    gap: 1.5rem;
}

.tier-card.card-single .card-info {
    flex: 1;
}

.card-icon {
    font-size: 2.5rem;
    line-height: 1;
    filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.3));
}

.card-info h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
    letter-spacing: 0.2px;
}

.card-info p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

.card-status {
    padding: 6px 12px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.4);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    color: #10B981;
    letter-spacing: 1px;
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* 层级颜色区分 */
.tier-decision .tier-content {
    border-color: rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, var(--bg-card) 100%);
}

.tier-consulting .tier-content {
    border-color: rgba(139, 92, 246, 0.3);
}

.tier-professional .tier-content {
    border-color: rgba(249, 115, 22, 0.3);
}

.tier-marketing .tier-content {
    border-color: rgba(236, 72, 153, 0.3);
}

.tier-execution .tier-content {
    border-color: rgba(16, 185, 129, 0.3);
}

/* 响应式 */
@media (max-width: 900px) {
    .matrix-spine {
        left: 2rem;
    }
    
    .tier-connector {
        left: 2rem;
    }
    
    /* 平板端：专业层和营销层改为2列 */
    .tier-professional .tier-cards,
    .tier-marketing .tier-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tier-content {
        padding: 2rem 1.5rem;
    }
    
    .tier-badge {
        gap: 0.75rem;
    }
    
    .tier-icon {
        font-size: 2rem;
    }
    
    .tier-label {
        font-size: 20px;
    }
}

@media (max-width: 600px) {
    /* 移动端：所有卡片单列 */
    .tier-cards {
        grid-template-columns: 1fr !important;
    }
    
    .tier-content {
        padding: 1.5rem 1rem;
    }
    
    .tier-badge {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .tier-icon {
        font-size: 1.75rem;
    }
    
    .tier-label {
        font-size: 18px;
    }
    
    .tier-tag {
        margin-left: 0;
        margin-top: 0.5rem;
        font-size: 10px;
    }
    
    .card-icon {
        font-size: 2rem;
    }
    
    .card-info h4 {
        font-size: 15px;
    }
    
    .card-info p {
        font-size: 12px;
    }
    
    .tier-card.card-single {
        padding: 1.5rem 1rem;
    }
}

/* ========== 应用场景 ========== */
.case-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    transition: var(--transition);
}

.case-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--ai-blue);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}

.case-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
}

.case-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.case-org {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    border-left: 4px solid var(--ai-blue);
}

.case-result {
    font-size: 15px;
    color: var(--ai-blue);
    font-weight: 600;
}

@media (max-width: 768px) {
    .case-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 工作流程 ========== */
.process-flow {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 2rem;
}

.process-step {
    display: flex;
    align-items: flex-start;
    gap: 1.75rem;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.process-step:hover {
    background: var(--bg-card-hover);
    border-color: var(--ai-blue);
    transform: translateX(6px);
}

.process-step.highlight {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, var(--bg-card) 100%);
    border-color: var(--ai-blue);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.2);
}

.step-num {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    background: var(--gradient-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.step-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step-content p {
    font-size: 15px;
    color: var(--text-muted);
}

.process-arrow {
    text-align: center;
    font-size: 1.75rem;
    color: var(--ai-blue);
    margin: 0.5rem 0;
    opacity: 0.6;
}

/* ========== 行业应用 ========== */
.industry-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
    padding: 0 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.industry-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.industry-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--ai-blue);
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.2);
}

.industry-icon {
    font-size: 3rem;
    margin-bottom: 1.25rem;
}

.industry-card h3 {
    font-size: 22px;
    font-weight: 600;
}

@media (max-width: 600px) {
    .industry-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========== CTA ========== */
.cta-section {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(249, 115, 22, 0.08) 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.cta-content {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
    padding: 0 2rem;
}

.cta-content h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 1.25rem;
    background: linear-gradient(90deg, #FFFFFF 0%, #93C5FD 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

/* ========== 页脚 ========== */
.site-footer {
    background: var(--bg-secondary);
    padding: 5rem 0 2.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 5rem;
    margin-bottom: 3.5rem;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding: 0 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.footer-brand img {
    height: 44px;
    border-radius: 8px;
}

.footer-brand span {
    font-size: 24px;
    font-weight: 700;
}

.footer-tagline {
    font-size: 15px;
    color: var(--text-muted);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--ai-blue);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border-color);
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

.footer-bottom p {
    font-size: 15px;
    color: var(--text-muted);
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    font-size: 15px;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-legal a:hover {
    color: var(--ai-blue);
}

@media (max-width: 900px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1.25rem;
        text-align: center;
    }
}

/* ========== 通用容器 ========== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 768px) {
    .container { padding: 0 1.5rem; }
}