/* ========================================
   XPASS - 高端黑金主题基础样式系统
   ======================================== */

:root {
    /* 高端黑金配色方案 */
    --primary: #D4AF37;
    --primary-light: #F4D03F;
    --primary-dark: #B8960F;
    --accent: #FFD700;
    --accent-dim: rgba(212, 175, 55, 0.5);

    /* 纯黑主题背景 */
    --bg: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-card: rgba(20, 20, 20, 0.95);
    --bg-glass: rgba(255, 255, 255, 0.02);
    --bg-glass-hover: rgba(255, 255, 255, 0.05);

    /* 文字颜色层级 */
    --text: #FFFFFF;
    --text-muted: rgba(255, 255, 255, 0.65);
    --text-dim: rgba(255, 255, 255, 0.4);
    --text-gold: var(--primary);

    /* 边框系统 */
    --border: rgba(212, 175, 55, 0.12);
    --border-light: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(212, 175, 55, 0.3);

    /* 阴影系统 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-gold: 0 8px 32px rgba(212, 175, 55, 0.15);
    --shadow-gold-hover: 0 12px 48px rgba(212, 175, 55, 0.25);
    --shadow-gold-intense: 0 0 60px rgba(212, 175, 55, 0.3);

    /* 动画曲线 */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* 过渡时间 */
    --transition-fast: all 0.2s var(--ease-smooth);
    --transition: all 0.4s var(--ease-smooth);
    --transition-slow: all 0.6s var(--ease-smooth);

    /* 间距系统 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-2xl: 120px;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ========================================
   全局重置
   ======================================== */

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    font-size: 16px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

/* ========================================
   选中与滚动条样式
   ======================================== */

::selection {
    background: var(--primary);
    color: #000;
    text-shadow: none;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-dark), var(--primary));
    border-radius: 5px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
}

/* ========================================
   无障碍辅助类
   ======================================== */

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

/* ========================================
   高端按钮系统
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 40px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    will-change: transform;
}

/* 按钮光泽效果 */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.6s var(--ease-smooth);
}

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

/* 主要按钮 - 黑金渐变 */
.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #000;
    font-weight: 700;
    box-shadow: var(--shadow-gold), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-gold-hover), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn--primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-gold);
}

/* 轮廓按钮 - 玻璃态 */
.btn--outline {
    background: var(--bg-glass);
    color: var(--primary);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn--outline:hover {
    background: var(--primary);
    color: #000;
    border-color: var(--primary);
    box-shadow: var(--shadow-gold);
    transform: translateY(-2px);
}

.btn--outline:active {
    transform: translateY(0);
}

/* ========================================
   导航栏
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 48px;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.nav.scrolled {
    padding: 16px 48px;
    background: rgba(0, 0, 0, 0.9);
    box-shadow: var(--shadow-md);
}

.nav__brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav__brand:hover {
    color: var(--primary);
    transform: scale(1.05);
}

.nav__logo {
    height: 32px;
    width: 32px;
    object-fit: contain;
}

.nav__brand-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav__links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
    position: relative;
}

.nav__links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s var(--ease-smooth);
}

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

.nav__links a:hover::after {
    width: 100%;
}

/* ========================================
   Toast 通知
   ======================================== */

.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 9999;
    opacity: 0;
    transition: var(--transition);
    min-width: 300px;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ========================================
   动画效果
   ======================================== */

@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(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes goldPulse {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
    }

    50% {
        box-shadow: 0 0 40px rgba(212, 175, 55, 0.6);
    }
}

/* 观察者动画类 */
.fi-observe {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.fi-in {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式断点
   ======================================== */

@media (max-width: 1200px) {
    :root {
        --spacing-xl: 64px;
        --spacing-2xl: 96px;
    }

    .nav {
        padding: 20px 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --spacing-2xl: 64px;
    }

    html {
        font-size: 14px;
    }

    .nav {
        padding: 16px 24px;
    }

    .nav__brand {
        font-size: 20px;
    }

    .nav__logo {
        height: 24px;
        width: 24px;
    }

    .nav__links {
        gap: 16px;
    }

    .btn {
        padding: 14px 28px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 12px 16px;
    }

    .nav__brand {
        font-size: 18px;
    }

    .nav__links {
        display: none;
        /* 移动端隐藏导航链接，可后续添加汉堡菜单 */
    }

    .btn {
        padding: 12px 24px;
        font-size: 12px;
    }

    .toast {
        min-width: calc(100vw - 32px);
        left: 16px;
        right: 16px;
        transform: translateX(0) translateY(100px);
    }

    .toast.show {
        transform: translateX(0) translateY(0);
    }
}

/* ========================================
   性能优化
   ======================================== */

/* 减少重绘 */
.btn,
.nav,
.fi-observe {
    will-change: transform;
}

/* 硬件加速 */
.btn,
.nav,
.toast {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}