/* ===========================
   智慧收粮管理系统介绍网站样式
   =========================== */

/* === 设计令牌（Design Tokens）=== */
:root {
    /* 品牌主色（深化金黄更专业） */
    --color-primary: #d97706;
    --color-primary-light: #f59e0b;
    --color-primary-dark: #b45309;
    --color-primary-50: #fffbeb;
    --color-primary-100: #fef3c7;
    --color-primary-200: #fde68a;

    /* 业务色彩 */
    --color-purchase: #3b82f6;
    --color-sale: #10b981;
    --color-inventory: #8b5cf6;
    --color-ledger: #06b6d4;
    --color-other: #ec4899;
    --color-report: #f59e0b;
    --color-system: #6b7280;

    /* 文字层级（slate 调更有质感） */
    --color-text: #0f172a;
    --color-text-light: #334155;
    --color-text-muted: #64748b;
    --color-text-faint: #94a3b8;

    /* 背景与分割 */
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-soft: #f1f5f9;
    --color-bg-dark: #0f172a;
    --color-border: #e2e8f0;
    --color-border-light: #eef2f6;

    /* 柔和多层阴影 */
    --shadow-xs: 0 1px 2px rgba(15,23,42,0.04);
    --shadow-sm: 0 2px 6px rgba(15,23,42,0.05), 0 1px 2px rgba(15,23,42,0.03);
    --shadow-md: 0 8px 20px rgba(15,23,42,0.07), 0 2px 4px rgba(15,23,42,0.04);
    --shadow-lg: 0 16px 36px rgba(15,23,42,0.10), 0 4px 10px rgba(15,23,42,0.05);
    --shadow-xl: 0 28px 56px rgba(15,23,42,0.14);
    --shadow-primary: 0 10px 24px rgba(217,119,6,0.28);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-2xl: 28px;

    /* 过渡 */
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* 字体栈（中文优先 + Inter 数字） */
    --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-num: "Inter", -apple-system, "Helvetica Neue", sans-serif;
}

/* === 基础样式 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::selection {
    background: var(--color-primary-100);
    color: var(--color-primary-dark);
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.65;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* 数字等宽对齐，提升数据类内容观感 */
.stat-number,
.stat-value,
.card-value,
.summary-value {
    font-family: var(--font-num);
    font-feature-settings: "tnum" 1, "lnum" 1;
    letter-spacing: -0.02em;
}

/* 可访问性：键盘焦点 & 减动偏好 */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: 4px;
}

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

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.78);
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid rgba(15,23,42,0.06);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    box-shadow: var(--shadow-sm);
    border-bottom-color: transparent;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    object-fit: contain;
}

.logo-text {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-light);
    font-size: 14.5px;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    padding: 6px 2px;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: width var(--transition);
}

.nav-link:hover::after {
    width: 24px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* === Hero 区域 === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 28px 80px;
    background:
        radial-gradient(1200px 500px at 85% 15%, rgba(253,230,138,0.55), transparent 60%),
        radial-gradient(900px 500px at 10% 90%, rgba(252,211,77,0.35), transparent 60%),
        linear-gradient(180deg, #fffbeb 0%, #fef3c7 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(217,119,6,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(217,119,6,0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
    pointer-events: none;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.grain-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    opacity: 0.25;
    animation: grainFall 10s infinite linear;
}

.grain-particle:nth-child(1) { left: 10%; animation-delay: 0s; }
.grain-particle:nth-child(2) { left: 30%; animation-delay: 2s; }
.grain-particle:nth-child(3) { left: 50%; animation-delay: 4s; }
.grain-particle:nth-child(4) { left: 70%; animation-delay: 6s; }
.grain-particle:nth-child(5) { left: 90%; animation-delay: 8s; }

@keyframes grainFall {
    0% { transform: translateY(-20px) rotate(0deg); opacity: 0; }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
}

.hero-content {
    max-width: 620px;
    z-index: 1;
    position: relative;
}

.hero-title {
    font-size: clamp(40px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    color: var(--color-text);
}

.title-highlight {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, #ea9f2d 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.hero-subtitle {
    font-size: clamp(18px, 2vw, 22px);
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.5;
}

.hero-desc {
    font-size: 15.5px;
    color: var(--color-text-muted);
    line-height: 1.85;
    margin-bottom: 40px;
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 30px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: 0.02em;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(217,119,6,0.38);
    filter: brightness(1.05);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: rgba(255,255,255,0.7);
    color: var(--color-primary-dark);
    border: 1.5px solid var(--color-primary);
    backdrop-filter: blur(6px);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

.btn-full {
    width: 100%;
}

.hero-stats {
    display: flex;
    gap: 48px;
    padding-top: 28px;
    border-top: 1px solid rgba(217,119,6,0.2);
}

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

.stat-number {
    font-size: 40px;
    font-weight: 800;
    color: var(--color-primary-dark);
    display: block;
    line-height: 1.1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.hero-image {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 500px;
    z-index: 1;
}

.dashboard-preview {
    background: var(--color-bg);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(15,23,42,0.04);
    overflow: hidden;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.preview-header {
    background: #f3f4f6;
    padding: 12px 16px;
    display: flex;
    gap: 8px;
}

.preview-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #d1d5db;
}

.preview-dot:first-child { background: #ef4444; }
.preview-dot:nth-child(2) { background: #fbbf24; }
.preview-dot:last-child { background: #10b981; }

.preview-content {
    display: flex;
    padding: 16px;
    gap: 16px;
    min-height: 300px;
}

.preview-sidebar {
    width: 120px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    padding: 12px;
}

.sidebar-item {
    padding: 10px 12px;
    font-size: 13px;
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.sidebar-item.active {
    background: var(--color-primary);
    color: #fff;
}

.sidebar-item:last-child {
    margin-bottom: 0;
}

.preview-main {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.preview-card {
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    padding: 16px;
}

.card-title {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.card-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-purchase);
    margin-bottom: 12px;
}

.card-value + .card-chart.green {
    background: var(--color-sale);
}

.card-chart {
    height: 60px;
    background: linear-gradient(135deg, var(--color-purchase) 0%, #60a5fa 100%);
    border-radius: var(--radius-sm);
    opacity: 0.8;
}

.card-chart.green {
    background: linear-gradient(135deg, var(--color-sale) 0%, #34d399 100%);
}

/* === 通用区块样式 === */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 110px 28px;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header::before {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    margin: 0 auto 20px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 2px;
}

.section-title {
    font-size: clamp(28px, 3vw, 40px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 14px;
    letter-spacing: -0.01em;
    line-height: 1.25;
}

.section-desc {
    font-size: 17px;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

/* === 核心功能 === */
.features {
    background: var(--color-bg);
}

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

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    isolation: isolate;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, transparent 40%, rgba(217,119,6,0.3), transparent 60%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
    z-index: -1;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(59,130,246,0.2) 100%);
    border-radius: 20px;
    transition: transform var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.06) rotate(-2deg);
}

.feature-icon svg {
    width: 42px;
    height: 42px;
}

.feature-icon.weighing { background: linear-gradient(135deg, rgba(59,130,246,0.08) 0%, rgba(59,130,246,0.18) 100%); }
.feature-icon.payment { background: linear-gradient(135deg, rgba(16,185,129,0.08) 0%, rgba(16,185,129,0.18) 100%); }
.feature-icon.inventory { background: linear-gradient(135deg, rgba(139,92,246,0.08) 0%, rgba(139,92,246,0.18) 100%); }
.feature-icon.report { background: linear-gradient(135deg, rgba(245,158,11,0.08) 0%, rgba(245,158,11,0.18) 100%); }

.feature-title {
    font-size: 19px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: 0.01em;
}

.feature-desc {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.75;
}

/* === 业务模块 === */
.modules {
    background: var(--color-bg-alt);
    position: relative;
}

.modules::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1px 1px, rgba(15,23,42,0.04) 1px, transparent 0);
    background-size: 24px 24px;
    pointer-events: none;
    opacity: 0.6;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
    position: relative;
}

.module-card {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.module-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.module-header {
    padding: 18px 22px;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.module-header::after {
    content: ''; position: absolute; bottom: 0; left: 22px; right: 22px;
    height: 1px; background: rgba(255,255,255,0.22);
}

.module-header.purchase { background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%); }
.module-header.sale { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.module-header.inventory { background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%); }
.module-header.ledger { background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%); }
.module-header.other { background: linear-gradient(135deg, #ec4899 0%, #db2777 100%); }
.module-header.report { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.module-header.system { background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%); }

.module-icon {
    width: 32px;
    height: 32px;
    color: rgba(255,255,255,0.9);
    flex-shrink: 0;
}

.module-icon svg {
    width: 100%;
    height: 100%;
}

.module-title {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.module-body {
    padding: 18px 22px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.module-list {
    list-style: none;
    margin-bottom: 12px;
    flex: 1;
}

.module-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 7px 0;
    font-size: 13.5px;
    color: var(--color-text-light);
    line-height: 1.5;
}

.module-list li:first-child {
    padding-top: 0;
}

.list-icon {
    font-size: 15px;
    line-height: 1.2;
    flex-shrink: 0;
}

.list-text {
    flex: 1;
}

.module-desc {
    font-size: 12.5px;
    color: var(--color-text-muted);
    line-height: 1.7;
    padding-top: 14px;
    margin-top: auto;
    border-top: 1px dashed rgba(15,23,42,0.08);
}

/* 业务模块响应式 */
@media (max-width: 1200px) {
    .modules-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === 系统优势 === */
.advantages {
    background: var(--color-bg);
}

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

.advantage-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 36px 32px;
    position: relative;
    transition: var(--transition);
    overflow: hidden;
}

.advantage-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.advantage-card:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.advantage-card:hover::after {
    transform: scaleX(1);
}

.advantage-number {
    position: absolute;
    top: 24px;
    right: 28px;
    font-family: var(--font-num);
    font-size: 52px;
    font-weight: 800;
    color: var(--color-primary);
    opacity: 0.15;
    line-height: 1;
    letter-spacing: -0.04em;
}

.advantage-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 14px;
    letter-spacing: 0.01em;
}

.advantage-desc {
    font-size: 14.5px;
    color: var(--color-text-light);
    line-height: 1.75;
}

/* === 硬件集成 === */
.hardware {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    position: relative;
    overflow: hidden;
}

.hardware::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(600px 300px at 20% 20%, rgba(217,119,6,0.12), transparent 70%),
        radial-gradient(600px 300px at 80% 80%, rgba(59,130,246,0.1), transparent 70%);
    pointer-events: none;
}

.hardware .section-container { position: relative; }

.hardware .section-title,
.hardware .section-desc {
    color: #fff;
}

.hardware .section-desc {
    color: rgba(255,255,255,0.65);
}

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

.hardware-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(6px);
}

.hardware-card:hover {
    background: rgba(255,255,255,0.09);
    border-color: rgba(217,119,6,0.4);
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.hardware-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
}

.hardware-icon svg {
    width: 100%;
    height: 100%;
}

.hardware-title {
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: 0.02em;
}

.hardware-desc {
    font-size: 13.5px;
    color: rgba(255,255,255,0.7);
    line-height: 1.75;
}

/* === 业务场景 === */
.scenarios {
    background: var(--color-bg-alt);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.scenario-card {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.scenario-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.scenario-card.featured {
    border: 2px solid var(--color-primary);
    position: relative;
    box-shadow: 0 0 0 4px rgba(217,119,6,0.08);
}

.scenario-badge {
    position: absolute;
    top: 18px;
    right: 18px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 999px;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-primary);
}

.scenario-image {
    height: 160px;
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
}

.scenario-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-muted);
}

.scenario-placeholder.small { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); }
.scenario-placeholder.medium { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); color: var(--color-primary-dark); }
.scenario-placeholder.large { background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%); }

.scenario-title {
    font-size: 20px;
    font-weight: 600;
    padding: 24px 28px 12px;
    letter-spacing: 0.01em;
}

.scenario-desc {
    font-size: 14.5px;
    color: var(--color-text-light);
    padding: 0 28px;
    line-height: 1.75;
}

.scenario-features {
    list-style: none;
    padding: 20px 28px 28px;
}

.scenario-features li {
    font-size: 14px;
    color: var(--color-sale);
    padding: 7px 0;
    font-weight: 500;
}

/* === 联系我们 === */
.contact {
    background: var(--color-bg);
}

.contact-content {
    max-width: 920px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 18px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 24px 26px;
    transition: var(--transition);
}

.info-card:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.info-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
    box-shadow: var(--shadow-primary);
}

.info-icon svg {
    width: 26px;
    height: 26px;
}

.info-content h4 {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.info-content p {
    font-size: 17px;
    color: var(--color-text);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.info-content p a {
    color: var(--color-primary-dark);
    text-decoration: none;
    transition: var(--transition-fast);
}

.info-content p a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

@media (max-width: 640px) {
    .contact-info { grid-template-columns: 1fr; }
}

.contact-form {
    background: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    padding: 32px;
}

.form-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(245,158,11,0.1);
}

.form-group textarea {
    resize: vertical;
}

/* === 页脚 === */
.footer {
    background: var(--color-bg-dark);
    color: #fff;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 64px 28px 48px;
    display: flex;
    justify-content: space-between;
    gap: 56px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: 0.02em;
}

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    padding: 3px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.55);
    line-height: 1.75;
    max-width: 260px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 18px;
    color: #fff;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.footer-column a {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    padding: 6px 0;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-primary-light);
    transform: translateX(2px);
}

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

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.02em;
}

/* === 返回顶部 === */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
    border: none;
    box-shadow: var(--shadow-primary);
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(217,119,6,0.4);
    filter: brightness(1.08);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
    .section-container {
        padding: 88px 24px;
    }

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

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

    .hero-image {
        display: none;
    }

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

    .hero-desc {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-stats {
        justify-content: center;
        padding-top: 24px;
    }

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

@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
        height: 60px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        padding: 20px;
        flex-direction: column;
        gap: 12px;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

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

    .nav-toggle {
        display: flex;
    }

    .features-grid,
    .modules-grid,
    .advantages-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .hardware-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .hero {
        padding: 100px 20px 72px;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

    .stat-number {
        font-size: 32px;
    }

    .section-container {
        padding: 72px 20px;
    }

    .section-header {
        margin-bottom: 44px;
    }

    .footer-container {
        flex-direction: column;
        padding: 48px 24px 32px;
        gap: 36px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 32px;
    }

    .module-card {
        max-width: 100%;
    }

    .module-list li {
        padding: 8px 0;
    }

    .info-card {
        padding: 20px;
    }

    .cases-summary {
        padding: 36px 24px;
    }
}

@media (max-width: 480px) {
    .hardware-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

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

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

    .summary-item:not(:last-child)::after {
        display: none;
    }

    .case-header {
        padding: 22px 22px 18px;
    }

    .case-title {
        text-align: left;
    }
}

/* === 案例展示 === */
.cases {
    background: var(--color-bg-alt);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 56px;
}

.case-card {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.case-card.featured {
    border: 2px solid var(--color-primary);
    position: relative;
    box-shadow: 0 0 0 4px rgba(217,119,6,0.08);
}

.case-header {
    padding: 24px 26px 20px;
    background:
        radial-gradient(500px 180px at 100% 0%, rgba(217,119,6,0.14), transparent 60%),
        linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    border-bottom: 1px solid rgba(217,119,6,0.12);
}

.case-badge {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 999px;
    letter-spacing: 0.04em;
    box-shadow: var(--shadow-primary);
    align-self: flex-start;
    white-space: nowrap;
}

.case-title {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.45;
    letter-spacing: 0.01em;
    text-align: left;
    margin: 0;
    word-break: break-word;
}

.case-content {
    padding: 24px 26px;
    flex: 1;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--color-border);
}

.case-stat {
    text-align: center;
    background: var(--color-bg-alt);
    padding: 14px 8px;
    border-radius: var(--radius-md);
}

.case-stat .stat-value {
    font-size: 22px;
    font-weight: 800;
    color: var(--color-primary-dark);
    display: block;
    margin-bottom: 4px;
    line-height: 1.1;
}

.case-stat .stat-label {
    font-size: 12px;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

.case-story {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.85;
}

.story-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin: 18px 0 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.story-title::before {
    content: '';
    width: 3px;
    height: 14px;
    background: var(--color-primary);
    border-radius: 2px;
}

.story-title:first-of-type {
    margin-top: 0;
}

.story-list {
    list-style: none;
    padding-left: 0;
    margin: 10px 0;
}

.story-list li {
    padding: 6px 0 6px 22px;
    position: relative;
    line-height: 1.7;
}

.story-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 6px;
    color: var(--color-sale);
    font-weight: 700;
    font-size: 14px;
}

.case-footer {
    padding: 16px 26px;
    background: var(--color-bg-alt);
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border-light);
}

/* 案例汇总 */
.cases-summary {
    background:
        radial-gradient(600px 300px at 15% 20%, rgba(217,119,6,0.18), transparent 70%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-radius: var(--radius-2xl);
    padding: 56px 48px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.06);
}

.summary-title {
    font-size: 24px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 40px;
    letter-spacing: 0.02em;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 28px;
}

.summary-item {
    text-align: center;
    position: relative;
}

.summary-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -16px;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(255,255,255,0.1);
}

.summary-value {
    font-size: 44px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    display: block;
    margin-bottom: 8px;
    line-height: 1.1;
}

.summary-label {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    letter-spacing: 0.02em;
}

.summary-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    margin-top: 12px;
}

/* 响应式补充 */
@media (max-width: 1024px) {
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .summary-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .case-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .summary-value {
        font-size: 36px;
    }
    
    .cases-summary {
        padding: 32px;
    }
}

/* === 常见问题 FAQ === */
.faq {
    padding: 100px 0;
    background:
        radial-gradient(1200px 420px at 50% -10%, rgba(217,119,6,0.06), transparent 60%),
        linear-gradient(180deg, var(--color-bg) 0%, var(--color-primary-50) 100%);
    position: relative;
}

.faq-list {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.faq-item:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-sm);
}

.faq-item[open] {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

/* 清除浏览器默认 details 三角标记 */
.faq-question {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 24px;
    cursor: pointer;
    list-style: none;
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.55;
    user-select: none;
    outline: none;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::marker { content: ""; }

.faq-question:hover {
    background: var(--color-primary-50);
    color: var(--color-primary-dark);
}

.faq-question:focus-visible {
    box-shadow: inset 0 0 0 2px var(--color-primary-light);
    border-radius: var(--radius-lg);
}

/* 问题左侧品牌色 Q 徽章 */
.faq-q-mark {
    flex: 0 0 auto;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    font-family: var(--font-num);
    font-weight: 800;
    font-size: 15px;
    letter-spacing: 0.02em;
    box-shadow: 0 4px 10px rgba(217,119,6,0.24);
}

.faq-question > span[itemprop="name"] {
    flex: 1 1 auto;
    min-width: 0;
    word-break: break-word;
}

/* 问题右侧 +/× toggle 图标 */
.faq-toggle {
    flex: 0 0 auto;
    position: relative;
    width: 22px;
    height: 22px;
    margin-left: 8px;
    transition: transform var(--transition);
}
.faq-toggle::before,
.faq-toggle::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 14px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transform: translate(-50%, -50%);
    transition: transform var(--transition);
}
.faq-toggle::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item[open] .faq-toggle {
    transform: rotate(180deg);
}
.faq-item[open] .faq-toggle::after {
    transform: translate(-50%, -50%) rotate(0deg);
    opacity: 0;
}

/* 答案区域 */
.faq-answer {
    padding: 0 24px 22px 70px;
    color: var(--color-text-light);
    font-size: 15.5px;
    line-height: 1.85;
    border-top: 1px dashed var(--color-border-light);
    animation: faqSlide 0.28s ease both;
}

.faq-answer p {
    margin: 14px 0 0;
}

.faq-answer strong {
    color: var(--color-primary-dark);
    font-weight: 700;
}

.faq-answer a {
    color: var(--color-primary-dark);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary-light);
    transition: color var(--transition-fast);
}
.faq-answer a:hover {
    color: var(--color-primary);
}

@keyframes faqSlide {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    .faq-answer { animation: none; }
    .faq-toggle, .faq-toggle::before, .faq-toggle::after,
    .faq-item, .faq-item[open] .faq-toggle {
        transition: none;
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .faq { padding: 72px 0; }
    .faq-question {
        padding: 16px 18px;
        gap: 12px;
        font-size: 15.5px;
    }
    .faq-q-mark {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }
    .faq-answer {
        padding: 0 18px 18px 58px;
        font-size: 14.5px;
    }
}

@media (max-width: 480px) {
    .faq-answer {
        padding: 0 18px 18px 18px;
    }
    .faq-question {
        flex-wrap: wrap;
    }
}