/* mirror_flow:p6_ai_generated */
/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Primary Palette - 工业蓝 */
    --color-primary: #2a5c8a;
    --color-primary-light: #3a7ab5;
    --color-primary-dark: #1e3f5f;
    --color-primary-bg: #e8f0f7;
    --color-primary-border: #c5d5e6;

    /* Accent - 金色点缀 */
    --color-accent: #c8960c;
    --color-accent-light: #e6b422;
    --color-accent-dark: #9a7309;
    --color-accent-bg: #fdf6e3;

    /* Neutral */
    --color-white: #ffffff;
    --color-black: #1a1a1a;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f0f2f4;
    --color-gray-200: #e2e6ea;
    --color-gray-300: #ced4da;
    --color-gray-400: #adb5bd;
    --color-gray-500: #6c757d;
    --color-gray-600: #495057;
    --color-gray-700: #343a40;
    --color-gray-800: #212529;
    --color-gray-900: #121416;

    /* Semantic */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;

    /* Typography */
    --font-family-base: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", "Fira Code", "Consolas", monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.8;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 16px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.10);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Layout */
    --container-max: 1280px;
    --container-padding: 1rem;
    --header-height: 72px;
    --header-height-scrolled: 56px;

    /* Breakpoints (for reference) */
    --bp-sm: 576px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1200px;
    --bp-2xl: 1400px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-600);
}

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

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

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

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

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

button {
    cursor: pointer;
}

table {
    border-collapse: collapse;
    width: 100%;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.container--narrow {
    max-width: 960px;
}

.container--wide {
    max-width: 1440px;
}

/* ===== Header & Navigation ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.site-header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    text-decoration: none;
    flex-shrink: 0;
}

.site-header__logo img {
    height: 40px;
    width: auto;
}

/* Primary Navigation */
.nav-primary {
    display: flex;
    align-items: center;
}

.nav-primary__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-primary__item {
    position: relative;
}

.nav-primary__link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-primary__link:hover,
.nav-primary__link--active {
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
}

/* Dropdown */
.nav-primary__dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition-base);
    padding: var(--spacing-sm) 0;
    z-index: 100;
}

.nav-primary__item:hover > .nav-primary__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-primary__dropdown .nav-primary__link {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 0;
    font-weight: var(--font-weight-normal);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
    background: none;
    border: none;
    padding: 0;
}

.nav-toggle__bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-800);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.nav-toggle--active .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle--active .nav-toggle__bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle--active .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    background-color: var(--color-primary-dark);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    margin-top: var(--header-height);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(30, 63, 95, 0.92) 0%,
        rgba(42, 92, 138, 0.78) 50%,
        rgba(30, 63, 95, 0.65) 100%
    );
    z-index: 1;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 680px;
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
}

.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-tight);
}

.hero__title span {
    color: var(--color-accent-light);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-relaxed);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

/* ===== Section Styles ===== */
.section {
    padding: var(--spacing-4xl) 0;
}

.section--gray {
    background-color: var(--color-gray-50);
}

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

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__title {
    font-size: var(--font-size-3xl);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.section__title::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

.section__subtitle {
    font-size: var(--font-size-md);
    color: var(--color-gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.7rem 1.8rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.4;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    border: 2px solid transparent;
}

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

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

.btn--accent {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

.btn--accent:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: var(--color-white);
}

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

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

.btn--outline-white {
    background-color: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn--outline-white:hover {
    background-color: var(--color-white);
    color: var(--color-primary-dark);
    border-color: var(--color-white);
}

.btn--sm {
    padding: 0.45rem 1.2rem;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
}

.btn--lg {
    padding: 0.9rem 2.4rem;
    font-size: var(--font-size-md);
    border-radius: var(--radius-lg);
}

.btn--block {
    width: 100%;
}

/* ===== Cards ===== */
.card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--color-primary-border);
}

.card__image {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    display: block;
}

.card__body {
    padding: var(--spacing-lg);
}

.card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.card__text {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

.card__link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

/* ===== Grid Layout ===== */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3,