/* ============================================
   公共主题与基础重置，统一视觉语言
   符合现代UI/UX设计标准
   ============================================ */

:root {
    /* ========== 色彩系统 ========== */
    /* 背景色系 - 符合WCAG AA对比度标准 */
    --color-bg-deep: #0b1120;
    --color-bg-soft: #111936;
    --color-bg-surface: rgba(15, 23, 42, 0.85);
    --color-surface: rgba(15, 23, 42, 0.75);
    --color-card: #121c3b;
    --color-card-light: #1c2750;
    --color-card-hover: rgba(28, 39, 80, 0.95);
    
    /* 边框与分割线 - 增强可见性 */
    --color-border: rgba(255, 255, 255, 0.12);
    --color-border-hover: rgba(255, 255, 255, 0.2);
    --color-border-strong: rgba(255, 255, 255, 0.3);
    --color-divider: rgba(255, 255, 255, 0.1);
    
    /* 主色调 - 确保4.5:1对比度 */
    --color-primary: #8cfcc8;
    --color-primary-strong: #65d9a8;
    --color-primary-soft: rgba(140, 252, 200, 0.25);
    --color-primary-hover: #a4ffd8;
    --color-primary-active: #4ec994;
    --color-primary-dark: #2d9a6f;
    
    /* 辅助色 */
    --color-accent: #7dd3fc;
    --color-accent-strong: #38bdf8;
    --color-accent-soft: rgba(125, 211, 252, 0.25);
    --color-accent-dark: #0284c7;
    
    /* 文本色系 - WCAG AA标准 (4.5:1对比度) */
    --color-text-main: #f8fafc;
    --color-text-secondary: #e2e8f0;
    --color-text-muted: #cbd5e1;
    --color-text-disabled: #94a3b8;
    --color-text-inverse: #0f172a;
    
    /* 状态色 - 增强对比度 */
    --color-success: #10b981;
    --color-success-light: #34d399;
    --color-success-dark: #059669;
    --color-warning: #f59e0b;
    --color-warning-light: #fbbf24;
    --color-warning-dark: #d97706;
    --color-error: #ef4444;
    --color-error-light: #f87171;
    --color-error-dark: #dc2626;
    --color-info: #3b82f6;
    --color-info-light: #60a5fa;
    --color-info-dark: #2563eb;
    
    /* ========== 阴影系统 ========== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 40px rgba(10, 14, 27, 0.4);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-strong: 0 25px 80px rgba(4, 9, 20, 0.55);
    --shadow-glow-primary: 0 0 20px rgba(140, 252, 200, 0.4);
    --shadow-glow-accent: 0 0 20px rgba(125, 211, 252, 0.4);
    
    /* ========== 圆角系统 ========== */
    --radius-xs: 4px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 999px;
    
    /* ========== 间距系统（8px基准） ========== */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* ========== 字体系统 ========== */
    /* 字族 */
    --font-family-base: "Inter", "HarmonyOS Sans", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-family-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Code", "Consolas", monospace;
    
    /* 字号层级 */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 28px;
    --font-size-4xl: 32px;
    --font-size-5xl: 36px;
    
    /* 字重 */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 行高 */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;
    
    /* 字间距 */
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.05em;
    --letter-spacing-wider: 0.1em;
    --letter-spacing-widest: 0.2em;
    
    /* ========== 动画系统 ========== */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* ========== 模糊效果 ========== */
    --blur-sm: blur(8px);
    --blur-md: blur(16px);
    --blur-lg: blur(24px);
    --blur-xl: blur(34px);
    --blur-bg: blur(34px);
    
    /* ========== 渐变 ========== */
    --gradient-primary: linear-gradient(120deg, var(--color-primary), var(--color-primary-strong));
    --gradient-accent: linear-gradient(120deg, var(--color-accent), var(--color-accent-strong));
    --gradient-brand: 
        radial-gradient(circle at 20% 20%, rgba(124, 58, 237, 0.55), transparent 45%),
        radial-gradient(circle at 80% 0%, rgba(14, 165, 233, 0.45), transparent 40%),
        radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.35), transparent 40%);
    
    /* ========== Z-index层级 ========== */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    
    /* ========== 响应式断点 ========== */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== 基础重置与排版 ========== */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-main);
    background-color: var(--color-bg-deep);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    position: relative;
    overflow-x: hidden;
}

/* 增强的背景效果：多层渐变 + 动态动画 */
body {
    background: linear-gradient(135deg, #081226 0%, #0b1a3a 25%, #0f264d 50%, #122f60 75%, #153873 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 背景网格效果 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        linear-gradient(rgba(140, 252, 200, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(140, 252, 200, 0.03) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.8;
    z-index: -1;
    pointer-events: none;
}

/* 背景光效 */
body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 20% 30%, rgba(125, 211, 252, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(140, 252, 200, 0.25) 0%, transparent 50%);
    animation: lightPulse 10s ease-in-out infinite alternate;
    z-index: -2;
    pointer-events: none;
}

@keyframes lightPulse {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(1.1); opacity: 0.8; }
}

.page-shell {
    width: 100%;
    height: 100vh;
    min-height: 100vh;
    max-height: 100vh;
    padding: clamp(10px, 1.5vh, 20px) clamp(16px, 2vw, 30px);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

/* ========== 排版层次系统 ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-main);
    margin: 0;
}

h1 { font-size: var(--font-size-5xl); letter-spacing: var(--letter-spacing-tight); }
h2 { font-size: var(--font-size-4xl); letter-spacing: var(--letter-spacing-normal); }
h3 { font-size: var(--font-size-3xl); letter-spacing: var(--letter-spacing-normal); }
h4 { font-size: var(--font-size-2xl); letter-spacing: var(--letter-spacing-wide); }
h5 { font-size: var(--font-size-xl); letter-spacing: var(--letter-spacing-wide); }
h6 { font-size: var(--font-size-lg); letter-spacing: var(--letter-spacing-wide); }

p {
    margin: 0;
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

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

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

/* ========== 顶部导航条 ========== */
.nav {
    width: min(1200px, 100%);
    margin: 0 auto var(--spacing-xl);
    padding: var(--spacing-md) clamp(20px, 4vw, 40px);
    border-radius: var(--radius-lg);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    font-size: clamp(18px, 2.2vw, 22px);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-widest);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    backdrop-filter: var(--blur-md);
    transition: all var(--transition-base);
}

.nav::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(140, 252, 200, 0.25), rgba(125, 211, 252, 0.2), transparent 60%);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.nav:hover::before {
    opacity: 1;
}

.glass-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-strong);
    backdrop-filter: var(--blur-bg);
    position: relative;
    overflow: hidden;
}

.glass-card::after {
    content: "";
    position: absolute;
    inset: -40% 20% auto;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.25), transparent 60%);
    opacity: 0.4;
    pointer-events: none;
}

/* ========== 按钮系统 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 14px 24px;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    font-family: var(--font-family-base);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-wide);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px; /* 触摸目标最小尺寸 */
}

.btn:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px var(--color-primary-soft);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md), var(--shadow-glow-primary);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
    background: linear-gradient(120deg, var(--color-primary-hover), var(--color-primary));
}

.btn-primary:active:not(:disabled) {
    transform: translateY(-1px) scale(0.98);
    box-shadow: var(--shadow-sm), var(--shadow-glow-primary);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-border-strong);
    color: var(--color-text-main);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-soft);
    transform: translateY(-2px);
}

.btn-outline:active:not(:disabled) {
    background: var(--color-primary-soft);
    border-color: var(--color-primary-strong);
    transform: translateY(0);
}

.btn-outline:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 按钮加载状态 */
.btn.loading {
    pointer-events: none;
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 3px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* 表单输入框基础样式 */
input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-main);
    background: var(--color-bg-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    transition: all var(--transition-base);
    min-height: 44px; /* 触摸目标最小尺寸 */
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-soft);
    background: var(--color-surface);
}

input[type="text"]:disabled,
input[type="password"]:disabled,
textarea:disabled,
select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--color-card);
}

input[type="text"]::placeholder,
input[type="password"]::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

/* 表单验证状态 */
input.error,
textarea.error {
    border-color: var(--color-error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.2);
}

input.success,
textarea.success {
    border-color: var(--color-success);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
}

input.warning,
textarea.warning {
    border-color: var(--color-warning);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

/* ========== 滚动条样式 ========== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    border-radius: var(--radius-full);
    background: linear-gradient(180deg, var(--color-primary-soft), var(--color-accent-soft));
    border: 2px solid transparent;
    background-clip: padding-box;
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    background-clip: padding-box;
}

/* Firefox滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary-soft) rgba(0, 0, 0, 0.2);
}

/* ========== 选择文本样式 ========== */
::selection {
    background: var(--color-primary-soft);
    color: var(--color-text-main);
}

::-moz-selection {
    background: var(--color-primary-soft);
    color: var(--color-text-main);
}

/* ========== 焦点样式 ========== */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ========== 禁用动画（无障碍） ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ========== 工具类 ========== */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }
.text-warning { color: var(--color-warning); }

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

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

/* 间距工具类 */
.mt-xs { margin-top: var(--spacing-xs); }
.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-xs { margin-bottom: var(--spacing-xs); }
.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-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* 动画工具类 */
.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-up {
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 加载动画 */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== 高对比度模式支持 ========== */
@media (prefers-contrast: high) {
    :root {
        --color-border: rgba(255, 255, 255, 0.4);
        --color-text-muted: var(--color-text-secondary);
        --color-border-strong: rgba(255, 255, 255, 0.6);
    }
    
    .btn {
        border-width: 2px;
    }
    
    input, textarea, select {
        border-width: 2px;
    }
}

/* ========== 打印样式优化 ========== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .btn,
    .nav {
        display: none;
    }
}