/**
 * 高端工业美学设计系统
 * 肇庆市臻科电热电器有限公司
 */

/* ============================
   设计令牌 (Design Tokens)
   ============================ */
:root {
    --c-primary: #1b1b1f;
    --c-primary-soft: #2d2d35;
    --c-accent: #c8956c;
    --c-accent-light: #e8d5c4;
    --c-accent-dark: #a87750;
    --c-surface: #faf9f7;
    --c-surface-warm: #f5f0eb;
    --c-border: #e8e4df;
    --c-text: #1b1b1f;
    --c-text-secondary: #6b6b76;
    --c-text-muted: #9a9aa8;
    --c-white: #ffffff;

    --shadow-sm: 0 1px 3px rgba(27, 27, 31, 0.06);
    --shadow-md: 0 4px 16px rgba(27, 27, 31, 0.08);
    --shadow-lg: 0 12px 40px rgba(27, 27, 31, 0.12);
    --shadow-accent: 0 8px 30px rgba(200, 149, 108, 0.25);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================
   基础重置与全局
   ============================ */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    color: var(--c-text);
    line-height: 1.7;
    letter-spacing: 0.01em;
}

::selection {
    background-color: var(--c-accent);
    color: var(--c-white);
}

:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

/* ============================
   滚动条
   ============================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--c-surface);
}

::-webkit-scrollbar-thumb {
    background: #c5c5ce;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a0a0ae;
}

/* ============================
   导航
   ============================ */
.nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.15rem;
    color: var(--c-text-secondary);
    font-weight: 500;
    font-size: 0.925rem;
    letter-spacing: 0.02em;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
    color: var(--c-primary);
    background-color: rgba(27, 27, 31, 0.04);
}

.nav-link.active {
    color: var(--c-accent-dark);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 18px;
    height: 2px;
    background: var(--c-accent);
    border-radius: 1px;
}

.header-scrolled {
    background-color: rgba(255, 255, 255, 0.97) !important;
    box-shadow: 0 1px 0 var(--c-border), var(--shadow-sm);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* ============================
   动画关键帧
   ============================ */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(36px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeRight {
    from { opacity: 0; transform: translateX(36px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes counter {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes drawLine {
    from { width: 0; }
    to   { width: 48px; }
}

/* ============================
   动画工具类
   ============================ */
.anim-fade-up {
    animation: fadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.anim-fade-right {
    animation: fadeRight 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.anim-scale-in {
    animation: scaleIn 0.6s ease-out forwards;
}

/* 滚动触发动画 */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================
   文字截断
   ============================ */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================
   渐变文字
   ============================ */
.gradient-text {
    background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================
   按钮效果
   ============================ */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

.btn-ripple:hover::after {
    width: 320px;
    height: 320px;
}

/* ============================
   卡片效果
   ============================ */
.card-elevated {
    background: var(--c-white);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal),
                border-color var(--transition-normal);
}

.card-elevated:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--c-accent-light);
}

/* ============================
   背景纹理
   ============================ */
.bg-grain {
    position: relative;
}

.bg-grain::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
}

/* ============================
   分隔线装饰
   ============================ */
.divider-accent {
    display: inline-block;
    width: 48px;
    height: 3px;
    background: var(--c-accent);
    border-radius: 2px;
}

/* ============================
   区域标题样式
   ============================ */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--c-surface-warm);
    color: var(--c-accent-dark);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-radius: 100px;
    border: 1px solid var(--c-accent-light);
}

/* ============================
   表单样式
   ============================ */
input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--c-accent) !important;
    box-shadow: 0 0 0 3px rgba(200, 149, 108, 0.12);
}

/* ============================
   页脚样式补充
   ============================ */
.footer-link {
    color: #9a9aa8;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-link:hover {
    color: var(--c-accent);
    padding-left: 4px;
}

/* ============================
   产品卡片
   ============================ */
.product-card {
    background: var(--c-white);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal),
                border-color var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-card .product-img {
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-img {
    transform: scale(1.05);
}

/* ============================
   标签/徽章
   ============================ */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

.tag-accent {
    background: var(--c-accent-light);
    color: var(--c-accent-dark);
}

.tag-hot {
    background: #fef2f2;
    color: #b91c1c;
}

/* ============================
   Hero 区域
   ============================ */
.hero-gradient {
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(200, 149, 108, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(200, 149, 108, 0.05) 0%, transparent 50%),
        linear-gradient(145deg, #1b1b1f 0%, #2a2a32 40%, #1f1f26 100%);
}

/* ============================
   统计数字
   ============================ */
.stat-number {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--c-accent);
    line-height: 1;
    letter-spacing: -0.02em;
}

/* ============================
   响应式
   ============================ */
@media (max-width: 768px) {
    .anim-fade-right {
        animation: fadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }

    .stat-number {
        font-size: 2rem;
    }
}

/* ============================
   加载占位
   ============================ */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* ============================
   打印
   ============================ */
@media print {
    .no-print { display: none !important; }
    body { font-size: 11pt; color: #000; }
    a { color: #000; text-decoration: underline; }
}