/**
 * 星谱智防 - 全局样式
 * 低空防御安全解决方案专业服务商
 */

/* ========== CSS Variables ========== */
:root {
    /* 品牌色 - 科技蓝 */
    --color-primary: #0066cc;
    --color-primary-light: #3399ff;
    --color-primary-dark: #004d99;
    --color-secondary: #00d4ff;
    --color-accent: #00e5a0;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    /* 文字颜色 */
    --color-text: #0a1628;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;

    /* 背景 */
    --color-bg: #f0f4f8;
    --color-bg-alt: #e8eef5;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;

    /* 边框 */
    --color-border: #d6e4f0;
    --color-border-light: #e8eef5;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #0066cc 0%, #004d99 100%);
    --gradient-secondary: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
    --gradient-hero: linear-gradient(135deg, #0a1628 0%, #0d2847 50%, #0a2040 100%);
    --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #00e5a0 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, hsla(210,100%,40%,0.15) 0px, transparent 50%),
                     radial-gradient(at 80% 0%, hsla(195,100%,50%,0.1) 0px, transparent 50%),
                     radial-gradient(at 0% 50%, hsla(200,80%,35%,0.1) 0px, transparent 50%);

    /* 阴影 */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-glow: 0 0 40px -10px rgb(0 102 204 / 0.5);

    /* 玻璃效果 */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-bg-light: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-blur: 20px;

    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    --line-height: 1.75;
    --line-height-tight: 1.25;
    --line-height-loose: 2;

    /* 间距 */
    --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;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 动画 */
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.5s;
    --easing: cubic-bezier(0.4, 0, 0.2, 1);

    /* 层级 */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1050;

    /* 尺寸 */
    --header-height: 100px;
    --sidebar-width: 320px;
    --content-width: 1280px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-cn), var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background: var(--color-bg);
}

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

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

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

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

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-normal) var(--easing);
    text-decoration: none;
    line-height: 1.5;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.4);
    color: white;
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

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

.btn-secondary {
    background: var(--gradient-secondary);
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
    color: white;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 0.375rem 1rem;
    font-size: var(--font-size-xs);
}

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

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

.section-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.section-header .section-line {
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    margin: var(--spacing-md) auto 0;
}

/* ========== Cards ========== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: all var(--duration-normal) var(--easing);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* ========== Tags ========== */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary);
    background: rgba(0, 102, 204, 0.08);
    border-radius: var(--radius-full);
    transition: all var(--duration-fast) var(--easing);
}

.tag:hover {
    background: rgba(0, 102, 204, 0.15);
    color: var(--color-primary-dark);
}

/* ========== Text Utilities ========== */
.text-primary { color: var(--color-primary); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-white { color: white; }

/* ========== Spacing ========== */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* ========== Display ========== */
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ========== Line Clamp ========== */
.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;
}

/* ========== Reading Progress ========== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-primary);
    z-index: calc(var(--z-fixed) + 1);
    transition: width 0.1s linear;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes scan {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

/* Scroll Reveal */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s var(--easing);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}


/* ========== Products ========== */
.products-intro { font-size: 1.15rem; color: var(--color-text-secondary); max-width: 760px; margin: 0 auto 2rem; text-align: center; }
.pp-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 1.5rem 0; }
.pp-card { display: block; background: var(--color-surface, #fff); border: 1px solid var(--color-border-light, #e5eef7); border-radius: 16px; overflow: hidden; text-decoration: none !important; border-bottom: 1px solid var(--color-border-light, #e5eef7) !important; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.pp-card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,102,204,.12); border-color: rgba(0,102,204,.25) !important; }
.pp-card:active { transform: scale(.985); box-shadow: 0 8px 20px rgba(0,102,204,.15); }
.pp-card-img { aspect-ratio: 4 / 3; background: linear-gradient(180deg, #f7fafc 0%, #eef4f9 100%); overflow: hidden; display: flex; align-items: center; justify-content: center; }
.pp-card-img img { width: 100% !important; height: 100% !important; object-fit: contain !important; display: block; padding: 12px; box-sizing: border-box; transition: transform .35s ease; }
.pp-card:hover .pp-card-img img { transform: scale(1.04); }
.pp-card-body { padding: 18px 20px 22px; }
.pp-code-tag { display: inline-block; padding: 2px 10px; border-radius: 999px; background: rgba(0,102,204,.08); color: var(--color-primary); font-size: .78rem; font-weight: 700; letter-spacing: .5px; margin-bottom: 10px; }
.pp-card-body h3 { font-size: 1.15rem; font-weight: 700; color: var(--color-text); margin: 0 0 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.pp-card-body p { font-size: .92rem; color: var(--color-text-secondary); line-height: 1.7; margin: 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.product-body .product-tagline { font-size: 1.3rem; font-weight: 600; color: var(--color-primary); margin: 0 0 1.4rem; padding: 0 0 1rem; border-bottom: 1px dashed var(--color-border-light, #e5eef7); }
.product-gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 1.5rem 0 0; }
.product-gallery img { width: 100%; height: auto; border-radius: 12px; }
/* 首页推荐位网格：桌面4列 / 平板2列 / 手机1列 */
.pp-grid-home { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .pp-grid-home { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .pp-grid-home { grid-template-columns: 1fr; } }

@media (max-width: 1024px) {
    .pp-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .product-gallery { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .pp-grid { grid-template-columns: 1fr; gap: 18px; margin: 1rem 0; }
    .pp-card-body h3 { font-size: 1.1rem; }
}

/* 隐藏标题下的装饰小横线（用户要求） */
.section-line { display: none !important; }
.footer-column h4::after { display: none !important; }

/* ========== Selection ========== */
::selection {
    background: rgba(0, 102, 204, 0.2);
    color: var(--color-text);
}

/* ========== 移动端通用适配 ========== */
@media (max-width: 640px) {
    .container { padding: 0 var(--spacing-lg); }
    .site-header .site-logo img { height: 56px; }
    .page-card { padding: var(--spacing-xl) var(--spacing-lg); }
    .page-hero { padding: var(--spacing-2xl) 0; }
    .page-hero-title { font-size: 1.75rem; }
    .products-intro { font-size: 1rem; }
}