/* ============================================
   军之甲 JUNZHIJIA - 中英双语营销型网站
   中山伟立塑料制品有限公司
   Global Design System & Styles
   ============================================ */

/* ---------- Fonts ---------- */
/* Using system font stack — Google Fonts blocked in China would block all CSS loading */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
    /* --- Primary Colors - Tech Deep Blue --- */
    --color-primary: #0A1F3D;
    --color-primary-light: #1A3A6B;
    --color-primary-dark: #061226;

    /* --- Accent - Industrial Orange --- */
    --color-accent: #FF6B1A;
    --color-accent-light: #FF8C47;
    --color-accent-dark: #E55A0E;

    /* --- Secondary - Steel Grey --- */
    --color-secondary: #2C3E50;
    --color-secondary-light: #5A6C7D;

    /* --- Backgrounds --- */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F5F7FA;
    --color-bg-tertiary: #EAECEF;
    --color-bg-dark: #0A1F3D;

    /* --- Text Colors --- */
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #4A4A4A;
    --color-text-tertiary: #8A8A8A;
    --color-text-inverse: #FFFFFF;

    /* --- Functional Colors --- */
    --color-success: #2ECC71;
    --color-warning: #F39C12;
    --color-danger: #E74C3C;

    /* --- Gradients --- */
    --gradient-primary: linear-gradient(135deg, #0A1F3D 0%, #1A3A6B 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B1A 0%, #FF8C47 100%);
    --gradient-hero: linear-gradient(135deg, #061226 0%, #0A1F3D 50%, #1A3A6B 100%);
    --gradient-hero-overlay: linear-gradient(180deg, rgba(6,18,38,0.7) 0%, rgba(10,31,61,0.85) 100%);

    /* --- Shadows --- */
    --shadow-sm: 0 2px 4px rgba(10, 31, 61, 0.08);
    --shadow-md: 0 4px 12px rgba(10, 31, 61, 0.12);
    --shadow-lg: 0 8px 24px rgba(10, 31, 61, 0.16);
    --shadow-xl: 0 16px 48px rgba(10, 31, 61, 0.20);
    --shadow-orange: 0 4px 16px rgba(255, 107, 26, 0.35);

    /* --- Spacing (8px base) --- */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    --space-5xl: 128px;

    /* --- Grid --- */
    --container-max: 1280px;
    --container-padding: 24px;
    --grid-gutter: 24px;

    /* --- Border Radius --- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* --- Transitions --- */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* --- Typography --- */
    --font-zh: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
    --font-en: "Inter", "Roboto", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --font-heading-en: "Oswald", "Inter", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;

    /* --- Header --- */
    --header-height: 80px;
    --header-height-scrolled: 60px;

    /* --- Responsive Breakpoints (for JS reference) --- */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
}

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

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

body {
    font-family: var(--font-en);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* Chinese text optimization */
html[lang="zh-CN"] body,
html[lang="zh"] body {
    font-family: var(--font-zh);
}

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

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

.container--wide {
    max-width: 1400px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--space-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.375rem; }
h5 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-md);
}

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

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

/* ---------- Utility Classes ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-accent { color: var(--color-accent); }
.text-inverse { color: var(--color-text-inverse); }

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------- Section Common Styles ---------- */
.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

.section--sm { padding: var(--space-3xl) 0; }
.section--lg { padding: var(--space-5xl) 0; }

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

.section__title {
    font-weight: 800;
    margin-bottom: var(--space-sm);
    position: relative;
    display: inline-block;
}

.section__title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    margin: var(--space-md) auto 0;
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-tertiary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

/* Section title for dark backgrounds */
.bg-dark .section__title,
.section--dark .section__title {
    color: var(--color-text-inverse);
}

.bg-dark .section__subtitle,
.section--dark .section__subtitle {
    color: rgba(255,255,255,0.6);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    line-height: 1;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.btn--primary {
    background: var(--gradient-accent);
    color: #FFFFFF;
    box-shadow: var(--shadow-orange);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 107, 26, 0.45);
    color: #FFFFFF;
}

.btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
    background: var(--color-primary);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn--ghost {
    background: transparent;
    color: #FFFFFF;
    border: 1px solid rgba(255,255,255,0.3);
}

.btn--ghost:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.6);
    color: #FFFFFF;
}

.btn--white {
    background: #FFFFFF;
    color: var(--color-primary);
    border: 2px solid #FFFFFF;
    box-shadow: var(--shadow-md);
}

.btn--white:hover {
    background: transparent;
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--lg {
    padding: 16px 40px;
    font-size: 1.125rem;
}

.btn--sm {
    padding: 10px 20px;
    font-size: 0.875rem;
}

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

/* ---------- Badge / Tag ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge--accent {
    background: var(--gradient-accent);
    color: #FFFFFF;
}

.badge--primary {
    background: var(--color-primary);
    color: #FFFFFF;
}

.badge--outline {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.badge--pp {
    background: #DBEAFE;
    color: #1E40AF;
}

.badge--abs {
    background: #EDE9FE;
    color: #6D28D9;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    padding: var(--space-md) 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-text-tertiary);
}

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

.breadcrumb__separator {
    color: var(--color-text-tertiary);
}

.breadcrumb__current {
    color: var(--color-text-primary);
    font-weight: 500;
}

/* ---------- Page Banner ---------- */
.page-banner {
    background: var(--gradient-primary);
    padding: var(--space-4xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,107,26,0.15) 0%, transparent 70%);
}

.page-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26,58,107,0.3) 0%, transparent 70%);
}

.page-banner__title {
    color: var(--color-text-inverse);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--space-md);
    position: relative;
    z-index: 1;
}

.page-banner__subtitle {
    color: rgba(255,255,255,0.7);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ---------- Back to Top ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--gradient-accent);
    color: #FFFFFF;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-secondary-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-secondary);
}

/* ---------- Page Loader ---------- */
.page-loader {
    position: fixed;
    inset: 0;
    background: var(--color-bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.page-loader__logo {
    font-size: 2rem;
    font-weight: 800;
    color: #FFFFFF;
    animation: pulseLogo 1.5s ease-in-out infinite;
    letter-spacing: 4px;
}

@keyframes pulseLogo {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.95); }
}

.page-loader__bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--gradient-accent);
    width: 0%;
    animation: loadingBar 1.5s ease forwards;
}

@keyframes loadingBar {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}