/* ==========================================================================
   织造美学主题设计 - 全站基础样式
   --------------------------------------------------------------------------
   以棉花白、靛蓝、亚麻色构建舒适且具有质感的纺织行业视觉语言。
   支撑所有页面的排版、布局、按钮、导航、页脚等基础组件。
   ========================================================================== */
:root {
    /* 品牌色系 */
    --color-primary: #3F51B5;            /* 靛蓝主色 */
    --color-primary-dark: #2C3A91;
    --color-secondary: #FAF0E6;          /* 棉花白背景 */
    --color-secondary-deep: #E6D5C0;
    --color-accent: #D2B48C;             /* 亚麻色强调 */
    --color-accent-strong: #B99463;
    --color-ink: #2C2C2C;
    --color-muted: #6B6258;
    --color-surface: #FFFFFF;
    --color-surface-ghost: rgba(255, 255, 255, 0.65);
    --color-line: rgba(210, 180, 140, 0.45);
    --color-overlay: rgba(63, 81, 181, 0.12);
    --color-shadow: rgba(33, 41, 72, 0.14);

    /* 字体系统 */
    --font-family-main: "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-size-base: 16px;
    --font-size-large: 1.2rem;
    --font-size-small: 0.92rem;

    /* 间距系统 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.75rem;
    --spacing-lg: 3.25rem;
    --spacing-xl: 5rem;

    /* 圆角与阴影 */
    --border-radius-sm: 6px;
    --border-radius-md: 14px;
    --border-radius-lg: 24px;
    --shadow-sm: 0 6px 18px var(--color-shadow);
    --shadow-md: 0 12px 32px rgba(33, 41, 72, 0.18);

    /* 渐变 */
    --gradient-thread: linear-gradient(120deg, rgba(63, 81, 181, 0.18) 0%, rgba(210, 180, 140, 0.32) 100%);
    --gradient-header: linear-gradient(135deg, rgba(250, 240, 230, 0.96) 0%, rgba(233, 215, 176, 0.92) 100%);
    --gradient-footer: linear-gradient(145deg, #2C3A91 0%, #3F51B5 48%, #6F7CD9 100%);
}

/* ==========================================================================
   全局基础排版
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family-main);
    font-size: var(--font-size-base);
    line-height: 1.65;
    color: var(--color-ink);
    background-color: var(--color-secondary);
    background-image:
        linear-gradient(120deg, rgba(63, 81, 181, 0.05) 0%, rgba(210, 180, 140, 0.12) 52%, rgba(255, 255, 255, 0.6) 100%),
        repeating-linear-gradient(0deg, rgba(255, 255, 255, 0) 0 14px, rgba(210, 180, 140, 0.16) 14px 28px);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: rgba(63, 81, 181, 0.2);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--color-primary-dark);
    line-height: 1.25;
}

h1 { font-size: clamp(2.6rem, 3vw, 3.4rem); }
h2 { font-size: clamp(2.1rem, 2.4vw, 2.6rem); }
h3 { font-size: clamp(1.6rem, 2vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
    color: var(--color-muted);
    margin-bottom: var(--spacing-sm);
}

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

.container {
    width: min(1180px, 94vw);
    margin: 0 auto;
}

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

.bg-light {
    background-color: var(--color-surface);
    background-image: linear-gradient(160deg, rgba(210, 180, 140, 0.12) 0%, rgba(255, 255, 255, 0.65) 100%);
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-muted); }

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.section-title::after {
    content: "";
    display: block;
    width: 78px;
    height: 4px;
    margin: var(--spacing-xs) auto 0;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(63, 81, 181, 0.7), rgba(210, 180, 140, 0.9));
}

.section-subtitle {
    max-width: 640px;
    margin: calc(var(--spacing-xs) * 3) auto var(--spacing-lg);
    color: var(--color-muted);
    text-align: center;
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.surface-card {
    background: var(--color-surface);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.surface-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(140deg, rgba(63, 81, 181, 0.06), rgba(210, 180, 140, 0.12));
    opacity: 0;
    transition: opacity 0.35s ease;
    z-index: 0;
}

.surface-card > * {
    position: relative;
    z-index: 1;
}

.surface-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

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

.link-more {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary-dark);
    font-weight: 600;
    gap: 6px;
    transition: transform 0.3s ease;
}

.link-more::after {
    content: "›";
    font-size: 1.1em;
    transform: translateY(-1px);
}

.link-more:hover {
    transform: translateX(4px);
    color: var(--color-accent-strong);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.75rem;
    border-radius: 999px;
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    background: rgba(63, 81, 181, 0.12);
    color: var(--color-primary-dark);
}

.badge-accent {
    background: rgba(210, 180, 140, 0.22);
    color: var(--color-accent-strong);
}

.woven-divider {
    height: 1px;
    background-image: repeating-linear-gradient(90deg, transparent 0 6px, rgba(210, 180, 140, 0.6) 6px 12px);
    margin: var(--spacing-md) 0;
}

.metric-strip {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.metric-card {
    min-width: 220px;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    background: var(--color-surface-ghost);
    border: 1px solid rgba(63, 81, 181, 0.12);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.metric-card strong {
    display: block;
    font-size: 2.4rem;
    color: var(--color-primary);
}

.metric-card span {
    color: var(--color-muted);
    font-size: var(--font-size-small);
}

.text-lead {
    font-size: 1.125rem;
    color: var(--color-ink);
    margin-bottom: var(--spacing-sm);
}

/* ==========================================================================
   按钮系统
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.8rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    position: relative;
    overflow: hidden;
    gap: 10px;
}

.btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.18);
    mix-blend-mode: screen;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #5C6BC0 100%);
    color: var(--color-surface);
    box-shadow: 0 8px 24px rgba(63, 81, 181, 0.25);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary-dark);
    border: 1px solid rgba(63, 81, 181, 0.35);
}

.btn-accent {
    background: linear-gradient(135deg, rgba(210, 180, 140, 0.95), rgba(185, 148, 99, 0.95));
    color: var(--color-ink);
    box-shadow: 0 8px 22px rgba(185, 148, 99, 0.28);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(210, 180, 140, 0.6);
    color: var(--color-ink);
}

.btn-large {
    padding: 1rem 2.4rem;
    font-size: 1.1rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

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

/* ==========================================================================
   导航栏
   ========================================================================== */
.main-header {
    position: fixed;
    inset: 0 0 auto 0;
    height: 82px;
    z-index: 1000;
    background: rgba(250, 240, 230, 0.86);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(210, 180, 140, 0.4);
    box-shadow: 0 8px 22px rgba(52, 35, 21, 0.06);
}

.main-header .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--color-primary-dark);
}

.main-nav .nav-list {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.main-nav .nav-item {
    position: relative;
}

.main-nav .nav-link {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.1rem;
    border-radius: 999px;
    color: var(--color-muted);
    font-weight: 600;
}

.main-nav .nav-link:hover,
.main-nav .nav-link.active {
    color: var(--color-primary-dark);
    background: rgba(63, 81, 181, 0.08);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    list-style: none;
    min-width: 200px;
    border-radius: var(--border-radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xs) 0;
    border: 1px solid rgba(63, 81, 181, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

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

.dropdown-menu li a {
    display: block;
    padding: 0.65rem 1.25rem;
    color: var(--color-muted);
}

.dropdown-menu li a:hover {
    background: rgba(63, 81, 181, 0.08);
    color: var(--color-primary-dark);
}

main {
    padding-top: 100px;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.main-footer {
    background: var(--gradient-footer);
    color: rgba(255, 255, 255, 0.92);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-grid {
    display: grid;
    gap: var(--spacing-md);
}

.footer-col h4 {
    font-size: 1.05rem;
    margin-bottom: var(--spacing-sm);
    color: #F6E8CD;
}

.main-footer a {
    color: rgba(255, 255, 255, 0.86);
}

.main-footer a:hover {
    color: #FDEFD7;
}

.footer-col ul {
    list-style: none;
    display: grid;
    gap: 0.35rem;
}

.footer-bottom {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    text-align: center;
    font-size: var(--font-size-small);
}

/* ==========================================================================
   通用组件与工具
   ========================================================================== */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.tag {
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    background: rgba(63, 81, 181, 0.1);
    color: var(--color-primary-dark);
    font-size: 0.82rem;
}

.tag-neutral {
    background: rgba(210, 180, 140, 0.2);
    color: var(--color-accent-strong);
}

.list-check {
    list-style: none;
    display: grid;
    gap: 0.65rem;
}

.list-check li {
    position: relative;
    padding-left: 1.5rem;
}

.list-check li::before {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    left: 0;
    top: 0.4rem;
    border-radius: 999px;
    background: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(63, 81, 181, 0.15);
}

.card-glass {
    background: rgba(255, 255, 255, 0.58);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-sm);
}

.fabric-chip {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    border: 3px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.color-palette {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.color-palette .swatch {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: var(--shadow-sm);
}

.progress-bar {
    width: 100%;
    height: 10px;
    border-radius: 999px;
    background: rgba(63, 81, 181, 0.08);
    overflow: hidden;
}

.progress-bar span {
    display: block;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(63, 81, 181, 0.9), rgba(210, 180, 140, 0.9));
}

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

.table th, .table td {
    padding: 0.85rem 1.2rem;
    border-bottom: 1px solid rgba(63, 81, 181, 0.08);
    text-align: left;
    color: var(--color-muted);
}

.table thead th {
    background: rgba(63, 81, 181, 0.08);
    color: var(--color-primary-dark);
}

blockquote {
    padding: var(--spacing-sm);
    border-left: 4px solid rgba(63, 81, 181, 0.6);
    background: rgba(63, 81, 181, 0.05);
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    margin: var(--spacing-sm) 0;
    color: var(--color-muted);
}

.floating-thread {
    position: absolute;
    width: 220px;
    height: 220px;
    border-radius: 999px;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.7), rgba(135, 121, 98, 0.06));
    filter: blur(0.5px);
    animation: float-thread 12s ease-in-out infinite;
    z-index: 0;
}

@keyframes float-thread {
    0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
    50% { transform: translate3d(14px, -18px, 0) scale(1.08); }
}

/* ==========================================================================
   响应式设计
   ========================================================================== */
@media (max-width: 1040px) {
    .main-nav .nav-link {
        padding: 0.65rem 0.9rem;
    }
}

@media (max-width: 900px) {
    .main-header {
        height: auto;
        padding: var(--spacing-xs) 0;
    }

    .main-header .container {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .main-nav .nav-list {
        flex-wrap: wrap;
        justify-content: center;
    }

    main {
        padding-top: 140px;
    }
}

@media (max-width: 768px) {
    .section-title { margin-bottom: var(--spacing-md); }
    .section-padding { padding: var(--spacing-lg) 0; }

    .metric-strip {
        flex-direction: column;
        align-items: stretch;
    }

    .metric-card {
        width: 100%;
    }

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

@media (max-width: 540px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    .btn {
        width: 100%;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .main-nav .nav-list {
        flex-direction: column;
    }
    .main-nav .nav-link {
        width: 100%;
        justify-content: center;
    }
}