/* ================= 全局变量 ================= */
:root {
    --bg-main: #F4F3F0;
    --bg-card: #FFFFFF;
    --text-main: #2A2A2A;
    --text-muted: #999999;
    --theme-gold: #C8A951;
    --theme-pink: #D98295;
    --theme-green: #82B39B;
    --border-color: #E0E0E0;
    --font-mono: "Courier New", Courier, monospace;
    --font-sans: "PingFang SC", "Helvetica Neue", "Microsoft YaHei Light", sans-serif;
}

[data-theme="dark"] {
    --bg-main: #1C1B1A;
    --bg-card: #242322;
    --text-main: #E8E6E1;
    --text-muted: #7A7674;
    --theme-gold: #D4B86A;
    --border-color: #3A3837;
}

/* ================= 基础重置 ================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border-radius: 0 !important;
    /* 绝对直角 */
}

body {
    font-family: var(--font-mono), var(--font-sans);
    font-weight: 300;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.8;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1), color 0.6s ease;
    overflow-x: hidden;
}

.en {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 1px;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ================= 自定义鼠标 (GPU加速版) ================= */
@media (pointer: fine) {
    * {
        cursor: none !important;
    }
}

.custom-cursor {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 9999;
    width: 24px;
    height: 24px;
    display: none;
}

@media (pointer: fine) {
    .custom-cursor {
        display: block;
    }
}

.custom-cursor::before,
.custom-cursor::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        background-color 0.3s ease,
        border-color 0.3s ease,
        opacity 0.3s ease;
}

/* 默认状态：极细十字架 */
.custom-cursor::before {
    width: 12px;
    height: 1px;
    background-color: var(--text-main);
    border: 1px solid transparent;
}

.custom-cursor::after {
    width: 1px;
    height: 12px;
    background-color: var(--text-main);
}

/* 悬浮状态：金色方框 (使用 transform 避免重排) */
.custom-cursor.hovered::before {
    width: 24px;
    height: 24px;
    background-color: transparent;
    border-color: var(--theme-gold);
    transform: translate(-50%, -50%) scale(1);
}

.custom-cursor.hovered::after {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0);
}

/* ================= 动画 ================= */
.fade-in {
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
    will-change: opacity, transform;
}

.delay-1 {
    animation-delay: 0.15s;
}

.delay-2 {
    animation-delay: 0.3s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================= 导航栏与页脚 ================= */
.top-nav {
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    height: 70px;
    transition: border-color 0.6s ease;
}

.brand {
    font-size: 18px;
    font-weight: 400;
    letter-spacing: 2px;
}

.brand span {
    color: var(--theme-gold);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-btn {
    font-size: 13px;
    transition: color 0.3s;
}

.nav-btn:hover {
    color: var(--theme-gold);
}

.active-nav {
    color: var(--theme-gold);
    border-bottom: 1px solid var(--theme-gold);
    padding-bottom: 4px;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 12px;
    color: var(--text-muted);
    transition: color 0.3s;
    font-family: var(--font-mono);
    margin-left: 20px;
}

.theme-toggle:hover {
    color: var(--theme-gold);
}

.footer {
    text-align: center;
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 12px;
}

.secret-login {
    cursor: pointer;
    margin-top: 15px;
    display: inline-block;
    transition: color 0.3s;
    color: var(--text-muted);
    font-size: 12px;
    letter-spacing: 2px;
}

.secret-login:hover {
    color: var(--theme-gold);
}

/* ================= 错误页面 (404 / 403) ================= */
.error-page-body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
    padding: 20px;
}

.error-box {
    border: 1px solid var(--text-main);
    padding: 80px 100px;
    background: var(--bg-card);
    position: relative;
}

/* 左上角机密标签 */
.error-badge {
    position: absolute;
    top: -12px;
    left: -12px;
    background: var(--bg-main);
    padding: 0 10px;
    font-size: 12px;
    color: var(--text-muted);
}

/* 403 专属粉色警告 */
.error-badge.restricted {
    color: var(--theme-pink);
}

.error-title.restricted {
    color: var(--theme-pink);
}

.error-code {
    font-size: 120px;
    font-weight: 300;
    line-height: 1;
    margin-bottom: 10px;
    color: var(--text-main);
    letter-spacing: -5px;
}

.error-title {
    font-size: 18px;
    letter-spacing: 4px;
    margin-bottom: 30px;
    color: var(--theme-gold);
}

.error-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 50px;
    letter-spacing: 1px;
}

.back-btn {
    display: inline-block;
    border: 1px solid var(--text-main);
    padding: 12px 30px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 13px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-btn:hover {
    background: var(--text-main);
    color: var(--bg-main);
}

/* ================= 全局响应式适配 ================= */
@media (max-width: 900px) {
    .top-nav {
        padding: 0 20px;
    }

    .nav-right {
        gap: 20px;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 14px;
    }

    .top-nav {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
        gap: 15px;
    }

    .nav-right {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .theme-toggle {
        margin-left: 0;
        width: 100%;
        text-align: center;
        margin-top: 5px;
    }

    .error-box {
        padding: 60px 40px;
    }

    .error-code {
        font-size: 80px;
    }
}

@media (hover: none) and (pointer: coarse) {

    /* 触屏防误触 */
    a:hover,
    button:hover {
        transform: none !important;
    }
}