:root {
    --brand-primary: #F97316;
    --brand-primary-light: #FB923C;
    --brand-primary-dark: #EA580C;
    --brand-primary-glow: rgba(249, 115, 22, 0.4);
    
    --brand-accent: #FB923C;
    --brand-accent-light: #FDBA74;
    --brand-accent-dark: #F97316;
    --brand-accent-hover: #FDBA74;
    
    --brand-coral: #F9A8D4;
    --brand-coral-light: #FBCFE8;
    
    --brand-terracotta: #FB923C;
    --brand-terracotta-light: #FDBA74;
    
    --brand-amber: #FCD34D;
    --brand-amber-light: #FDE68A;
    
    --brand-rose: #F87171;
    --brand-rose-light: #FCA5A5;
    
    --brand-mint: #FEF3C7;
    --brand-success: #10B981;
    --brand-success-light: #34D399;
    --brand-success-dark: #059669;
    --brand-error: #F87171;
    --brand-wechat: #07C160;
    --brand-wechat-light: #10B981;
    --brand-wechat-dark: #059669;
    
    --bg-page: #F5F7FA;
    --bg-primary: #F5F7FA;
    --bg-secondary: #EEF2F7;
    --bg-cream: #FFFDF5;
    --bg-sky: #FEF3C7;
    --bg-white: #FFFFFF;
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-hover: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(255, 255, 255, 0.6);
    --glass-blur: 24px;
    
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-tertiary: #94A3B8;
    --text-white: #FFFFFF;
    
    --border-color: rgba(148, 163, 184, 0.15);
    --border-light: rgba(255, 255, 255, 0.7);
    --border-subtle: rgba(148, 163, 184, 0.12);
    
    --shadow-neu-outset: 
        6px 6px 12px rgba(148, 163, 184, 0.1),
        -6px -6px 12px rgba(255, 255, 255, 0.95);
    --shadow-neu-inset: 
        inset 4px 4px 8px rgba(148, 163, 184, 0.08),
        inset -4px -4px 8px rgba(255, 255, 255, 0.9);
    --shadow-neu-pressed: 
        inset 5px 5px 10px rgba(148, 163, 184, 0.12),
        inset -3px -3px 6px rgba(255, 255, 255, 0.7);
    
    --shadow-glass: 
        0 8px 32px rgba(148, 163, 184, 0.1),
        0 2px 8px rgba(148, 163, 184, 0.06);
    
    --shadow-card: 
        0 1px 3px rgba(0, 0, 0, 0.04),
        0 4px 12px rgba(0, 0, 0, 0.06);
    
    --shadow-card-hover: 
        0 2px 6px rgba(0, 0, 0, 0.06),
        0 12px 32px rgba(0, 0, 0, 0.08);
    
    --shadow-float: 
        0 20px 40px rgba(249, 115, 22, 0.12),
        0 8px 16px rgba(249, 115, 22, 0.08);
    
    --shadow-glow-primary: 
        0 0 30px rgba(249, 115, 22, 0.3),
        0 0 60px rgba(249, 115, 22, 0.15);
    
    --gradient-primary: linear-gradient(135deg, #FB923C 0%, #FCD34D 50%, #F9A8D4 100%);
    --gradient-accent: linear-gradient(135deg, #FB923C 0%, #FDBA74 50%, #FDE68A 100%);
    --gradient-warm: linear-gradient(135deg, #FB923C 0%, #F87171 50%, #F9A8D4 100%);
    --gradient-soft: linear-gradient(135deg, #FFF7ED 0%, #FEF3C7 50%, #FDE68A 100%);
    --gradient-sunset: linear-gradient(135deg, #F9A8D4 0%, #FCD34D 50%, #FB923C 100%);
    
    --font-family: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-family-mono: 'SF Mono', 'Consolas', monospace;
    
    --font-size-xs: 13px;
    --font-size-sm: 15px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
    --font-size-4xl: 44px;
    --font-size-5xl: 52px;
    --font-size-6xl: 60px;
    --font-size-7xl: 72px;
    
    /* 流体排版 - 自动适配PC和移动端 */
    --h1-fluid: clamp(28px, 5vw, 52px);
    --h2-fluid: clamp(24px, 4vw, 44px);
    --h3-fluid: clamp(20px, 3vw, 36px);
    --h4-fluid: clamp(18px, 2.5vw, 28px);
    --body-fluid: clamp(15px, 1.8vw, 18px);
    --lead-fluid: clamp(16px, 2vw, 20px);
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    --spacing-5xl: 96px;
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-2xl: 40px;
    --radius-3xl: 60px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

    --primary-color: var(--text-primary);
    --accent-color: var(--brand-primary);
    --text-main: var(--text-primary);
    --text-light: var(--text-secondary);
    --bg-color: var(--bg-primary);
    --white: var(--bg-white);
    
    /* ===== 底纹装饰（暖橙主题 - 柔和斜纹） ===== */
    --pattern-opacity: 0.10;
    --bg-pattern: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 60L60 0' stroke='%23F97316' stroke-width='0.5' stroke-opacity='1' fill='none'/%3E%3Cpath d='M-60 60L0 0' stroke='%23F97316' stroke-width='0.5' stroke-opacity='0.6' fill='none'/%3E%3Cpath d='M60 120L120 60' stroke='%23F97316' stroke-width='0.5' stroke-opacity='0.6' fill='none'/%3E%3C/svg%3E");
    --bg-pattern-dot: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='0.8' fill='%23F97316' fill-opacity='1'/%3E%3C/svg%3E");
    --bg-pattern-grid: url("data:image/svg+xml,%3Csvg width='80' height='80' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='80' height='80' fill='none' stroke='%23F97316' stroke-width='0.3' stroke-opacity='0.5'/%3E%3C/svg%3E");
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    background: var(--bg-page);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

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

img {
    max-width: 100%;
    display: block;
}

/* 标题层级复原 - 覆盖 reset.css 的 font-size:100% 重置 */
h1 { font-size: var(--h1-fluid); font-weight: 800; line-height: 1.2; letter-spacing: -0.03em; }
h2 { font-size: var(--h2-fluid); font-weight: 700; line-height: 1.25; letter-spacing: -0.02em; }
h3 { font-size: var(--h3-fluid); font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
h4 { font-size: var(--h4-fluid); font-weight: 600; line-height: 1.35; }
h5 { font-size: var(--font-size-lg); font-weight: 600; line-height: 1.4; }
h6 { font-size: var(--font-size-base); font-weight: 600; line-height: 1.5; }
p { margin-bottom: 1em; line-height: 1.7; }

/* 移动端标题适度缩小 */
@media (max-width: 768px) {
    h1 { letter-spacing: -0.02em; }
    h2 { letter-spacing: -0.01em; }
    p { line-height: 1.65; }
}

::selection {
    background: var(--brand-terracotta);
    color: var(--text-white);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-glass);
}

.glass-hover:hover {
    background: var(--glass-bg-hover);
}

.neu-outset {
    background: var(--bg-white);
    box-shadow: var(--shadow-neu-outset);
}

.neu-inset {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-neu-inset);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-border {
    position: relative;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: var(--gradient-primary);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.noise-bg {
    position: relative;
}

.noise-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' 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)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    border-radius: inherit;
}

.glow-primary {
    box-shadow: var(--shadow-glow-primary);
}

.float-animation {
    animation: float 6s ease-in-out infinite;
}

.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.fade-in {
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.scale-in {
    animation: scaleIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.slide-in-left {
    animation: slideInLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.slide-in-right {
    animation: slideInRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }

.text-balance {
    text-wrap: balance;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 
        0 4px 16px rgba(249, 115, 22, 0.3),
        0 2px 4px rgba(249, 115, 22, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 8px 28px rgba(249, 115, 22, 0.35),
        0 4px 12px rgba(249, 115, 22, 0.25);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: 
        0 4px 12px rgba(249, 115, 22, 0.25),
        0 2px 4px rgba(249, 115, 22, 0.15);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.6);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 500;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(12px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.1);
}

.btn-neu {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 500;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-neu-outset);
}

.btn-neu:hover {
    box-shadow: var(--shadow-neu-inset);
    transform: scale(0.98);
}

.btn-neu:active {
    box-shadow: var(--shadow-neu-pressed);
}

.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

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

.card-neu {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-neu-outset);
    transition: all var(--transition-normal);
}

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

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-12px) rotate(1deg); }
    66% { transform: translateY(-6px) rotate(-1deg); }
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

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

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

@keyframes pulse-glow {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin-top: -9px;
    margin-left: -9px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--text-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-loading span {
    visibility: hidden;
}

.btn-loading i {
    visibility: hidden;
}

.btn:focus-visible {
    outline: 3px solid rgba(251, 146, 60, 0.3);
    outline-offset: 2px;
}

input:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(251, 146, 60, 0.3);
    outline-offset: 2px;
}

a:focus-visible {
    outline: 2px solid var(--brand-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ========================================
   底纹装饰工具类
   用于白色背景组件，提供极淡的主题色底纹装饰
   ======================================== */

/* 斜纹底纹 - 适合卡片、区块 */
.bg-textured {
    position: relative;
    background-color: var(--bg-white);
}

.bg-textured::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--bg-pattern);
    opacity: var(--pattern-opacity);
    pointer-events: none;
    border-radius: inherit;
    z-index: 0;
}

.bg-textured > * {
    position: relative;
    z-index: 1;
}

/* 点阵底纹 - 更细腻的装饰 */
.bg-textured-dot {
    position: relative;
    background-color: var(--bg-white);
}

.bg-textured-dot::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--bg-pattern-dot);
    opacity: var(--pattern-opacity);
    pointer-events: none;
    border-radius: inherit;
    z-index: 0;
}

.bg-textured-dot > * {
    position: relative;
    z-index: 1;
}

/* 网格底纹 - 适合大面积区域 */
.bg-textured-grid {
    position: relative;
    background-color: var(--bg-white);
}

.bg-textured-grid::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--bg-pattern-grid);
    opacity: var(--pattern-opacity);
    pointer-events: none;
    border-radius: inherit;
    z-index: 0;
}

.bg-textured-grid > * {
    position: relative;
    z-index: 1;
}

/* 兼容已有 .neu-outset / .card-neu / .card-glass 的自动底纹 */
.card-neu.bg-textured,
.neu-outset.bg-textured,
.card-glass.bg-textured {
    background-image: none;
}