/* =========================================================
   公共导航栏样式（独立文件，所有 developer 页面统一引用）
   加载顺序：style.css → header-nav.css → modern.css
   说明：本文件包含主题变量与顶部导航样式，
        不含任何页面内容区样式，可在所有页面上安全使用。
   ========================================================= */

:root {
    --dev-bg: #f5f7fb;
    --dev-surface: #ffffff;
    --dev-soft: #eef3fa;
    --dev-text: #0f172a;
    --dev-text-soft: #5c6b83;
    --dev-border: #e3e9f2;
    --dev-brand: #4f46e5;
    --dev-brand-2: #06b6d4;
    --dev-radius-xl: 26px;
    --dev-radius-lg: 18px;
    --dev-radius: 12px;
    --dev-radius-sm: 8px;
    --dev-shadow-xs: 0 1px 2px rgba(16, 24, 40, .05);
    --dev-shadow-sm: 0 2px 6px rgba(16, 24, 40, .05), 0 14px 34px -22px rgba(16, 24, 40, .35);
    --dev-shadow-md: 0 22px 50px -26px rgba(16, 24, 40, .38);
    --dev-shadow-lg: 0 50px 110px -50px rgba(16, 24, 40, .5);
    --dev-header-h: 64px;
}

/* ================= 主题基底 ================= */
body {
    background:
        radial-gradient(900px 480px at 10% -12%, rgba(79, 70, 229, .10), transparent 62%),
        radial-gradient(820px 420px at 92% -6%, rgba(6, 182, 212, .10), transparent 62%),
        var(--dev-bg);
    color: var(--dev-text);
    -webkit-font-smoothing: antialiased;
}

/* ================= 顶部导航（毛玻璃） ================= */
.api-header {
    background: rgba(255, 255, 255, .72);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid rgba(15, 23, 42, .06);
    box-shadow: none;
}

.header-content {
    max-width: 1240px;
    padding: 12px 24px;
    min-height: var(--dev-header-h);
}

.logo h1 {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--dev-text);
}

.main-nav ul {
    gap: 4px;
    padding: 4px;
    border-radius: 999px;
    background: rgba(15, 23, 42, .035);
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    height: 34px;
    padding: 0 14px;
    border-radius: 999px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--dev-text-soft);
    transition: all .25s ease;
}

.main-nav a:hover {
    color: var(--dev-text);
    background: rgba(255, 255, 255, .8);
}

.main-nav a.active {
    color: #fff;
    background: linear-gradient(135deg, var(--dev-brand), #6366f1);
    box-shadow: 0 8px 18px -10px rgba(79, 70, 229, .9);
}

.login-btn,
.register-btn,
.console-btn {
    border-radius: 999px;
    padding: 8px 18px;
    font-size: 13.5px;
    font-weight: 600;
}

.login-btn {
    background: #fff;
    color: var(--dev-text);
    border: 1px solid var(--dev-border);
}

.login-btn:hover {
    background: #fff;
    color: var(--dev-brand);
    border-color: var(--dev-brand);
}

.register-btn,
.console-btn {
    background: linear-gradient(135deg, var(--dev-brand), #6366f1);
    border: none;
    color: #fff;
    box-shadow: 0 10px 22px -12px rgba(79, 70, 229, .9);
}

.register-btn:hover,
.console-btn:hover {
    filter: brightness(1.06);
    background: linear-gradient(135deg, var(--dev-brand), #6366f1);
    border: none;
}

/* ================= 导航响应式 ================= */
@media (max-width: 992px) {
    .header-content {
        padding: 10px 18px;
    }

    .main-nav {
        order: 3;
        width: 100%;
        margin-top: 4px;
    }

    .main-nav ul {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 576px) {
    .header-content {
        padding: 10px 15px;
    }

    .login-btn,
    .register-btn,
    .console-btn {
        padding: 6px 14px;
        font-size: 13px;
    }
}