/* ==========================================================================
   2025 Future Urban Theme Stylesheet for 河南四通实业有限公司
   Design focus: 智慧交通 · 城市脉动
   ========================================================================== */
:root {
    /* 色彩系统 */
    --color-primary: #2E86AB;            /* 科技蓝 */
    --color-primary-dark: #154360;
    --color-secondary: #4A5568;          /* 城市灰 */
    --color-surface: rgba(13, 27, 45, 0.82);
    --color-surface-strong: rgba(9, 20, 39, 0.95);
    --color-accent: #FF6B35;             /* 活力橙 */
    --color-accent-light: #FF8A5C;
    --color-highlight: #22D3EE;
    --color-text: #E2E8F0;
    --color-text-muted: rgba(226, 232, 240, 0.7);
    --color-border: rgba(255, 255, 255, 0.12);
    --color-border-strong: rgba(255, 107, 53, 0.45);
    --color-success: #38EF7D;
    --color-warning: #F4D03F;
    --color-danger: #F87171;

    /* 背景渐变 */
    --gradient-sky-day: linear-gradient(135deg, rgba(19, 54, 97, 0.92) 0%, rgba(40, 99, 154, 0.86) 40%, rgba(82, 144, 196, 0.78) 100%);
    --gradient-sky-night: linear-gradient(135deg, rgba(7, 15, 32, 0.96) 0%, rgba(21, 35, 73, 0.9) 35%, rgba(74, 37, 113, 0.82) 100%);
    --gradient-surface: linear-gradient(135deg, rgba(26, 44, 78, 0.85) 0%, rgba(32, 54, 93, 0.85) 50%, rgba(21, 38, 72, 0.92) 100%);
    --gradient-card: linear-gradient(145deg, rgba(32, 56, 95, 0.75) 0%, rgba(16, 31, 58, 0.92) 100%);
    --gradient-accent: linear-gradient(120deg, rgba(255, 107, 53, 0.95) 0%, rgba(255, 152, 80, 0.95) 100%);
    --gradient-neon: linear-gradient(120deg, rgba(34, 211, 238, 0.9) 0%, rgba(94, 234, 212, 0.9) 100%);

    /* 字体与尺寸 */
    --font-heading: "Poppins", "Microsoft YaHei", "PingFang SC", sans-serif;
    --font-body: "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", monospace;
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 28px;
    --space-lg: 48px;
    --space-xl: 88px;

    /* 圆角与阴影 */
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --shadow-soft: 0 25px 55px rgba(5, 15, 30, 0.35);
    --shadow-card: 0 18px 45px rgba(8, 28, 52, 0.38);
    --shadow-glow: 0 0 45px rgba(34, 211, 238, 0.4);

    --transition-base: 0.35s ease;
    --transition-fast: 0.18s ease;
    --max-width: 1220px;
}

/* 夜间主题覆盖 */
body[data-theme="night"] {
    --color-text: #F1F5F9;
    --color-text-muted: rgba(203, 213, 225, 0.72);
    --color-surface: rgba(10, 18, 37, 0.9);
    --color-surface-strong: rgba(7, 12, 24, 0.96);
    --color-border: rgba(255, 255, 255, 0.16);
}

/* 通用重置 */
*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-text);
    background: linear-gradient(180deg, #050915 0%, #0A1324 35%, #0F1D38 100%);
    min-height: 100vh;
    padding-top: 96px; /* 预留固定导航高度 */
    background-attachment: fixed;
    transition: background 0.6s ease, color 0.3s ease;
}

body[data-theme="night"] {
    background: linear-gradient(180deg, #040614 0%, #070D1F 40%, #101F3A 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(90deg, transparent 0 220px, rgba(255, 255, 255, 0.04) 220px 221px),
                linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.06) 70%, rgba(0, 0, 0, 0.85) 100%);
    pointer-events: none;
    z-index: 0;
}

body[data-theme="night"]::before {
    background: repeating-linear-gradient(90deg, transparent 0 200px, rgba(255, 255, 255, 0.05) 200px 201px),
                linear-gradient(180deg, rgba(82, 32, 138, 0.15) 0%, rgba(22, 51, 102, 0.35) 55%, rgba(0, 0, 0, 0.9) 100%);
}

main {
    position: relative;
    z-index: 1;
}

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

a:hover {
    color: var(--color-accent);
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

img {
    max-width: 100%;
    display: block;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.container {
    width: min(calc(100% - var(--space-lg)), var(--max-width));
    margin: 0 auto;
}

section {
    position: relative;
    padding: var(--space-xl) 0;
}

.section-heading {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-heading .tag {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 12px;
    color: var(--color-text-muted);
    background-color: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(8px);
}

.section-heading h2 {
    font-family: var(--font-heading);
    font-size: clamp(2.1rem, 4vw, 2.8rem);
    margin: var(--space-sm) 0 var(--space-xs);
    letter-spacing: 0.02em;
}

.section-heading p {
    color: var(--color-text-muted);
    max-width: 680px;
    margin: 0 auto;
}

/* ==============================
   头部导航
   ============================== */
.header {
    position: fixed;
    inset: 0 0 auto 0;
    height: 96px;
    display: flex;
    align-items: center;
    z-index: 1000;
    transition: transform 0.45s ease, background-color 0.45s ease, box-shadow 0.45s ease;
    backdrop-filter: blur(18px);
    background: rgba(4, 12, 28, 0.68);
    border-bottom: 1px solid var(--color-border);
}

.header.scrolled {
    background: rgba(4, 12, 28, 0.92);
    box-shadow: 0 14px 40px rgba(2, 8, 18, 0.45);
}

.nav-container {
    width: min(calc(100% - var(--space-lg)), var(--max-width));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.logo a {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    letter-spacing: 0.05em;
    color: var(--color-text);
    position: relative;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: nowrap;
}

.nav-item {
    position: relative;
    padding: 16px 0;
}

.nav-item > a {
    font-weight: 600;
    white-space: nowrap;
    font-size: 0.95rem;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-item > a::after {
    content: "";
    width: 8px;
    height: 8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-right-color: currentColor;
    transform: rotate(135deg);
    opacity: 0.55;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.nav-item:not(.has-submenu) > a::after {
    display: none;
}

.nav-item > a:hover,
.nav-item > a:focus {
    background: rgba(46, 134, 171, 0.12);
    color: var(--color-accent);
}

.nav-item:hover > a::after {
    opacity: 1;
    transform: rotate(315deg);
}

.nav-item:hover > a {
    color: var(--color-accent);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% - 4px);
    left: 0;
    min-width: 220px;
    background: var(--color-surface-strong);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    backdrop-filter: blur(18px);
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item a {
    display: block;
    padding: 10px 14px;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
}

.dropdown-item a:hover {
    background: rgba(46, 134, 171, 0.16);
    color: var(--color-accent);
}

.menu-toggle {
    display: none;
    font-size: 28px;
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.05);
}

/* ==============================
   交通信号灯式加载提示
   ============================== */
#traffic-loader {
    position: fixed;
    inset: 0 0 auto 0;
    height: 12px;
    background: rgba(7, 14, 28, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    transform: translateY(-100%);
    opacity: 0;
    transition: transform 0.45s ease, opacity 0.45s ease;
    z-index: 1200;
    border-bottom: 1px solid var(--color-border);
}

body.loading #traffic-loader {
    transform: translateY(0);
    opacity: 1;
}

#traffic-loader .light {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: 0 0 14px currentColor;
    animation: trafficLights 1.8s infinite;
}

#traffic-loader .light.red {
    color: #FF4D4D;
}

#traffic-loader .light.yellow {
    color: #FFD93D;
    animation-delay: 0.3s;
}

#traffic-loader .light.green {
    color: #4ADE80;
    animation-delay: 0.6s;
}

@keyframes trafficLights {
    0%, 20%, 100% {
        opacity: 0.35;
        transform: scale(0.75);
    }
    35%, 65% {
        opacity: 1;
        transform: scale(1.15);
    }
}

/* ==============================
   首屏城市全景
   ============================== */
.hero {
    position: relative;
    min-height: calc(100vh - 96px);
    display: flex;
    align-items: center;
    padding: var(--space-xl) 0;
    overflow: hidden;
    isolation: isolate;
    background: var(--gradient-sky-day), var(--hero-image-day, none);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    color: #FFFFFF;
}

body[data-theme="night"] .hero {
    background: var(--gradient-sky-night), var(--hero-image-night, var(--hero-image-day, none));
    background-position: center;
    background-size: cover;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -50% -10% -30%;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.06) 0, transparent 45%),
        radial-gradient(circle at 80% 30%, rgba(255, 255, 255, 0.08) 0, transparent 35%),
        linear-gradient(90deg, transparent 0 20%, rgba(255, 255, 255, 0.12) 50%, transparent 80% 100%);
    opacity: 0.45;
    z-index: -1;
    mix-blend-mode: screen;
}

.hero::after {
    content: "";
    position: absolute;
    inset: auto -20% 0 -20%;
    height: 220px;
    background: repeating-linear-gradient(90deg, transparent 0 180px, rgba(255, 255, 255, 0.08) 180px 190px);
    opacity: 0.25;
    animation: trafficFlow 12s linear infinite;
}

@keyframes trafficFlow {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(-360px);
    }
}

.hero .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    align-items: center;
    gap: var(--space-lg);
}

.hero-content {
    position: relative;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    background: rgba(6, 14, 30, 0.55);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-content .tagline {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 8px 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    font-size: 0.85rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.8rem, 5vw, 3.6rem);
    line-height: 1.15;
    margin: 0 0 var(--space-sm);
    letter-spacing: 0.02em;
}

.hero-content p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.78);
    margin-bottom: var(--space-md);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 26px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: 1px solid transparent;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
    position: relative;
    overflow: hidden;
    font-size: 0.85rem;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 12px 25px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 35px rgba(255, 107, 53, 0.45);
}

.btn-outline {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.35);
    color: #fff;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hero-switcher {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.switcher-toggle {
    width: 48px;
    height: 26px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    position: relative;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.switcher-toggle::before {
    content: "";
    position: absolute;
    top: 3px;
    left: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
    transition: transform var(--transition-fast);
}

body[data-theme="night"] .switcher-toggle {
    background: rgba(34, 211, 238, 0.25);
}

body[data-theme="night"] .switcher-toggle::before {
    transform: translateX(22px);
    background: linear-gradient(135deg, #22D3EE, #60A5FA);
    box-shadow: 0 0 18px rgba(96, 165, 250, 0.6);
}

.hero-dashboard {
    display: grid;
    gap: var(--space-sm);
}

.metric-card {
    background: rgba(6, 14, 30, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: "";
    position: absolute;
    inset: -20% 50% auto;
    height: 80%;
    width: 140%;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.35) 0%, transparent 55%);
    transform: translateX(-50%);
    opacity: 0.6;
}

.metric-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.metric-card .value {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.6rem);
    margin: var(--space-xs) 0;
}

.metric-card .delta {
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-success);
}

.metric-card .delta.down {
    color: var(--color-warning);
}

.metric-card .meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ==============================
   六宫格与通用卡片
   ============================== */
.grid {
    display: grid;
    gap: var(--space-sm);
}

.grid-col-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-col-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-col-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-col-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.neon-card {
    position: relative;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: var(--gradient-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-fast);
}

.neon-card::before {
    content: "";
    position: absolute;
    inset: -40% -10% auto;
    height: 180px;
    background: radial-gradient(circle at top, rgba(34, 211, 238, 0.35), transparent 65%);
    opacity: 0.65;
    transition: opacity var(--transition-fast);
}

.neon-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(34, 211, 238, 0.55);
}

.neon-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.neon-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.neon-card .icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(34, 211, 238, 0.15);
    display: grid;
    place-items: center;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
    font-size: 1.5rem;
}

.labels {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: var(--space-sm);
}

.label {
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ==============================
   数据驾驶舱
   ============================== */
.data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-sm);
}

.data-card {
    position: relative;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(9, 20, 39, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.data-card::before {
    content: "";
    position: absolute;
    inset: -40% auto auto -40%;
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.4), transparent 70%);
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.data-card:hover::before {
    opacity: 0.85;
}

.data-card .title {
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-bottom: var(--space-xs);
}

.data-card .value {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin-bottom: 6px;
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
}

.data-card .trend {
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-success);
}

.data-card .trend.down {
    color: var(--color-warning);
}

.data-card .meta {
    margin-top: var(--space-xs);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ==============================
   合作城市地图
   ============================== */
.map-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(9, 20, 39, 0.7);
    box-shadow: var(--shadow-soft);
}

.map-canvas {
    position: relative;
    height: 420px;
    background: linear-gradient(160deg, rgba(7, 15, 32, 0.8), rgba(26, 54, 94, 0.45)),
        var(--map-image, url("../images/6Mc3C3JMs7zp.png"));
    background-size: cover;
    background-position: center;
}

.map-marker {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--gradient-neon);
    box-shadow: 0 0 16px rgba(34, 211, 238, 0.6);
    transform: translate(-50%, -50%);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.map-marker::after {
    content: "";
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(34, 211, 238, 0.4);
    opacity: 0.6;
    animation: markerPulse 2.8s ease-in-out infinite;
}

@keyframes markerPulse {
    0% {
        transform: scale(0.6);
        opacity: 0.2;
    }
    50% {
        transform: scale(1);
        opacity: 0.6;
    }
    100% {
        transform: scale(1.2);
        opacity: 0;
    }
}

.map-marker:hover {
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 0 24px rgba(255, 255, 255, 0.55);
}

.map-tooltip {
    position: absolute;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    background: rgba(4, 12, 28, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: #fff;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    pointer-events: none;
    transform: translate(-50%, -120%);
    opacity: 0;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    box-shadow: 0 18px 32px rgba(5, 12, 24, 0.4);
    white-space: nowrap;
}

.map-tooltip.visible {
    opacity: 1;
    transform: translate(-50%, -130%);
}

.map-legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: rgba(4, 12, 28, 0.85);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.legend-item {
    flex: 1 1 200px;
    display: flex;
    gap: 12px;
    align-items: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.legend-item span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(34, 211, 238, 0.25);
    color: var(--color-accent);
    font-size: 0.8rem;
    font-weight: 600;
}

/* ==============================
   时间轴 & 里程碑
   ============================== */
.timeline {
    position: relative;
    padding-left: 32px;
    border-left: 2px solid rgba(255, 255, 255, 0.08);
    display: grid;
    gap: var(--space-md);
}

.timeline::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 -3px;
    width: 6px;
    background: linear-gradient(180deg, rgba(255, 107, 53, 0.5), rgba(46, 134, 171, 0.5));
    opacity: 0.5;
}

.timeline-item {
    position: relative;
    padding: var(--space-sm) var(--space-sm) var(--space-sm) var(--space-md);
    background: rgba(10, 20, 38, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(10px);
}

.timeline-item::before {
    content: attr(data-year);
    position: absolute;
    top: 18px;
    left: -118px;
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.08);
    letter-spacing: 0.12em;
}

.timeline-item::after {
    content: "";
    position: absolute;
    top: 24px;
    left: -42px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--gradient-neon);
    box-shadow: 0 0 18px rgba(34, 211, 238, 0.6);
}

.timeline-item h3 {
    font-size: 1.15rem;
    margin-bottom: var(--space-xs);
}

.timeline-item p {
    color: var(--color-text-muted);
}

.timeline-item .tagline {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    margin-top: var(--space-xs);
}

/* ==============================
   雷达图 & 数据可视化
   ============================== */
.radar-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: rgba(8, 18, 36, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.12);
    display: grid;
    gap: var(--space-sm);
}

.radar-card svg {
    width: 100%;
    height: auto;
}

.radar-card ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-xs);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.radar-card li::before {
    content: "•";
    margin-right: 6px;
    color: var(--color-accent);
}

/* ==============================
   徽章墙 / 荣誉展示
   ============================== */
.badge-wall {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-sm);
}

.badge-card {
    padding: var(--space-md);
    background: rgba(5, 14, 30, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-card);
}

.badge-card h4 {
    margin-bottom: var(--space-xs);
}

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

/* ==============================
   案例 & 资讯卡片
   ============================== */
.case-grid,
.news-grid {
    display: grid;
    gap: var(--space-sm);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.case-card,
.news-card {
    background: rgba(9, 20, 38, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.case-card:hover,
.news-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 45px rgba(6, 20, 38, 0.45);
}

.case-card img,
.news-card img {
    border-radius: 0;
    max-height: 200px;
    object-fit: cover;
}

.card-content {
    padding: var(--space-md);
    display: grid;
    gap: var(--space-xs);
}

.card-content h3 {
    margin: 0;
    font-size: 1.1rem;
}

.card-meta {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

.card-tag {
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-text-muted);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.card-link {
    margin-top: auto;
    padding: var(--space-sm);
    color: var(--color-accent);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.card-link::after {
    content: "→";
    transition: transform var(--transition-fast);
}

.card-link:hover::after {
    transform: translateX(4px);
}

/* ==============================
   视觉集锦
   ============================== */
.visual-gallery {
    position: relative;
    padding: var(--space-xl) 0;
    background: linear-gradient(135deg, rgba(8, 18, 34, 0.92) 0%, rgba(18, 36, 68, 0.88) 45%, rgba(8, 18, 34, 0.92) 100%);
    overflow: hidden;
}

.visual-gallery::before {
    content: "";
    position: absolute;
    inset: -40% -25% auto -25%;
    height: 72%;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.18) 0%, rgba(34, 211, 238, 0) 60%);
    pointer-events: none;
}

.visual-gallery .section-heading {
    position: relative;
}

.visual-gallery .gallery-grid {
    position: relative;
    display: grid;
    gap: var(--space-sm);
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.visual-gallery .gallery-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(9, 20, 38, 0.7);
    min-height: 240px;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.visual-gallery .gallery-item::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(4, 12, 24, 0) 40%, rgba(4, 12, 24, 0.75) 85%);
    opacity: 0.85;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.visual-gallery .gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transform: scale(1);
    transition: transform var(--transition-base);
}

.visual-gallery .gallery-item figcaption {
    position: absolute;
    inset: auto 0 0 0;
    padding: 18px 20px;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    color: var(--color-text);
    z-index: 1;
}

.visual-gallery .gallery-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 30px 60px rgba(5, 16, 34, 0.55);
}

.visual-gallery .gallery-item:hover::after {
    opacity: 0.72;
}

.visual-gallery .gallery-item:hover img {
    transform: scale(1.05);
}

/* ==============================
   品牌故事图文
   ============================== */
.image-story {
    position: relative;
}

.image-story-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-lg);
    align-items: center;
}

.story-text .section-heading {
    margin-bottom: var(--space-md);
}

.story-text .section-heading p {
    margin-bottom: var(--space-sm);
}

.story-highlights {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.story-highlights li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.story-highlights li::before {
    content: "";
    width: 10px;
    height: 10px;
    margin-top: 6px;
    border-radius: 50%;
    background: var(--gradient-neon);
    flex-shrink: 0;
    box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
}

.story-gallery {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    gap: var(--space-sm);
    align-items: stretch;
}

.story-photo {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: rgba(9, 20, 38, 0.76);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-card);
    min-height: 220px;
}

.story-photo-large {
    min-height: 420px;
}

.story-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-base);
}

.story-photo figcaption {
    position: absolute;
    inset: auto 0 0 0;
    padding: 16px 18px;
    font-size: 0.9rem;
    color: var(--color-text);
    background: linear-gradient(180deg, rgba(5, 12, 24, 0) 0%, rgba(5, 12, 24, 0.85) 75%);
    backdrop-filter: blur(4px);
}

.story-photo-stack {
    display: grid;
    gap: var(--space-sm);
    grid-template-rows: repeat(2, minmax(0, 1fr));
}

.story-photo:hover img {
    transform: scale(1.04);
}

/* ==============================
   联系方式 & 表单
   ============================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.contact-card,
.form-card {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    background: rgba(9, 20, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: var(--shadow-card);
}

.contact-info {
    display: grid;
    gap: var(--space-sm);
}

.contact-info .item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.contact-info .icon {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: rgba(46, 134, 171, 0.18);
    display: grid;
    place-items: center;
    color: var(--color-accent);
    font-size: 1.2rem;
}

form {
    display: grid;
    gap: var(--space-sm);
}

label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

input,
select,
textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(5, 12, 25, 0.65);
    color: var(--color-text);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(34, 211, 238, 0.65);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18);
}

textarea {
    min-height: 140px;
    resize: vertical;
}

/* ==============================
   页脚
   ============================== */
.footer {
    position: relative;
    background: radial-gradient(circle at top, rgba(34, 211, 238, 0.12), transparent 55%),
                rgba(4, 12, 26, 0.95);
    color: rgba(226, 232, 240, 0.82);
    padding: var(--space-lg) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 1;
}

.footer::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(34, 211, 238, 0.12), transparent 50%);
    pointer-events: none;
}

.footer .grid {
    position: relative;
    z-index: 1;
}

.footer h4 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: #fff;
}

.footer p,
.footer a {
    color: rgba(226, 232, 240, 0.75);
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer a:hover {
    color: var(--color-accent);
}

.footer .badge {
    font-family: var(--font-mono);
    letter-spacing: 0.18em;
    font-size: 0.75rem;
    color: rgba(226, 232, 240, 0.55);
}

.footer-bottom {
    margin-top: var(--space-lg);
    padding-top: var(--space-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
    font-size: 0.85rem;
    color: rgba(226, 232, 240, 0.6);
}

/* ==============================
   辅助样式
   ============================== */
.highlight-text {
    color: #fff;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.muted {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
    margin: var(--space-sm) 0;
}

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

.chip {
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-sm);
}

.kpi-card {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(34, 211, 238, 0.08);
    border: 1px solid rgba(34, 211, 238, 0.28);
    text-align: center;
}

.kpi-card .value {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
}

.kpi-card .label {
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

table {
    width: 100%;
    border-collapse: collapse;
    overflow: hidden;
    border-radius: var(--radius-md);
}

th,
td {
    padding: 14px 18px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    text-align: left;
}

th {
    background: rgba(255, 255, 255, 0.08);
    font-weight: 600;
    letter-spacing: 0.06em;
}

tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.04);
}

blockquote {
    margin: var(--space-md) 0;
    padding: var(--space-sm) var(--space-md);
    border-left: 3px solid var(--color-accent);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--color-text-muted);
}

.video-frame {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
}

.video-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-md);
    border: none;
}

/* ==============================
   响应式适配
   ============================== */
@media (max-width: 1200px) {
    .nav-container {
        padding: 0 var(--space-sm);
    }
}

@media (max-width: 1024px) {
    body {
        padding-top: 84px;
    }
    .header {
        height: 84px;
    }
    .hero .container {
        grid-template-columns: 1fr;
    }
    .hero-content {
        padding: var(--space-md);
    }
    .hero-dashboard {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .image-story-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .story-gallery {
        grid-template-columns: 1fr;
    }

    .story-photo-stack {
        grid-template-rows: repeat(2, minmax(0, 220px));
    }

    .story-photo-large {
        min-height: 340px;
    }
}

@media (max-width: 920px) {
    .nav-menu {
        position: absolute;
        top: 84px;
        right: var(--space-sm);
        width: min(92vw, 320px);
        flex-direction: column;
        background: rgba(4, 12, 28, 0.98);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius-lg);
        padding: var(--space-sm);
        box-shadow: var(--shadow-soft);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px);
        transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-item {
        width: 100%;
    }

    .nav-item > a {
        width: 100%;
        justify-content: space-between;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: rgba(12, 24, 45, 0.95);
        border: 1px solid rgba(255, 255, 255, 0.08);
        margin-top: var(--space-xs);
    }

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

    .timeline {
        padding-left: var(--space-md);
    }

    .timeline-item::before {
        position: static;
        display: block;
        margin-bottom: 6px;
    }

    .timeline-item::after {
        left: -30px;
        top: 12px;
    }

    .visual-gallery {
        padding: var(--space-lg) 0;
    }

    .visual-gallery .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .story-photo-large {
        min-height: 320px;
    }

    .story-photo {
        min-height: 200px;
    }
}

@media (max-width: 768px) {
    :root {
        --space-md: 22px;
        --space-lg: 38px;
        --space-xl: 64px;
    }
    .grid-col-2,
    .grid-col-3,
    .grid-col-4,
    .grid-col-5 {
        grid-template-columns: 1fr;
    }
    .hero-dashboard {
        grid-template-columns: 1fr;
    }
    .data-grid {
        grid-template-columns: 1fr;
    }
    section {
        padding: var(--space-lg) 0;
    }

    .visual-gallery .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }

    .story-photo-stack {
        grid-template-rows: repeat(2, minmax(0, 1fr));
    }

    .story-photo-large {
        min-height: 280px;
    }
}

@media (max-width: 520px) {
    body {
        padding-top: 76px;
    }
    .header {
        height: 76px;
    }
    .hero-content h1 {
        font-size: clamp(2.2rem, 6vw, 2.6rem);
    }
    .hero-content {
        padding: var(--space-sm);
    }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .btn {
        width: 100%;
    }

    .visual-gallery .gallery-grid {
        grid-template-columns: 1fr;
    }

    .story-photo {
        min-height: 220px;
    }

    .story-photo-large {
        min-height: 260px;
    }

    .story-photo-stack {
        grid-template-rows: repeat(2, minmax(0, 1fr));
        gap: var(--space-sm);
    }
}

/* ==============================
   子页面首屏
   ============================== */
.subpage-hero {
    position: relative;
    padding: var(--space-xl) 0 var(--space-lg);
    background: linear-gradient(135deg, rgba(10, 20, 40, 0.9), rgba(28, 60, 94, 0.9)),
                var(--hero-bg, url("../images/AlIIActdPTFo.jpg"));
    background-size: cover;
    background-position: center;
    color: #fff;
    overflow: hidden;
}

.subpage-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(4, 12, 26, 0.75) 0%, rgba(4, 12, 26, 0.4) 55%, rgba(4, 12, 26, 0.85) 100%);
    backdrop-filter: blur(6px);
}

.subpage-hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--space-sm);
    max-width: 960px;
}

.subpage-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.4rem, 4vw, 2.8rem);
    margin: 0;
}

.subpage-hero p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.82);
    max-width: 640px;
}

.breadcrumb {
    display: inline-flex;
    gap: 10px;
    align-items: center;
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.75);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.82);
}

.page-section {
    padding: var(--space-xl) 0;
}

.content-grid {
    display: grid;
    gap: var(--space-sm);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.content-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: rgba(9, 20, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-card);
}

.content-card h3 {
    margin-bottom: var(--space-xs);
}

.content-card p {
    color: var(--color-text-muted);
}

.pillar-grid {
    display: grid;
    gap: var(--space-md);
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.pillar-card {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    background: rgba(9, 20, 39, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.12);
    position: relative;
    overflow: hidden;
}

.pillar-card::before {
    content: attr(data-title);
    position: absolute;
    top: var(--space-sm);
    right: -40px;
    font-size: 4rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.04);
    letter-spacing: 0.08em;
    transform: rotate(-12deg);
}

.pillar-card h3 {
    margin-bottom: var(--space-xs);
}

.pillar-card ul {
    margin-top: var(--space-xs);
    display: grid;
    gap: 8px;
    color: var(--color-text-muted);
}

.dual-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: var(--space-md);
}

.dual-columns .pane {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: rgba(5, 14, 30, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-band {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(34, 211, 238, 0.08);
    border: 1px solid rgba(34, 211, 238, 0.25);
    display: grid;
    gap: var(--space-xs);
}