/* 登录门禁全屏遮罩：直接透出底层的动态 3D 流体/NewJeans 质感背景，实现完全同步 */
.auth-gatekeeper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(248, 250, 252, 0.18);
    backdrop-filter: blur(14px) saturate(160%);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999999;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s ease;
}

.auth-gatekeeper.logged-in {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* 晶莹毛玻璃流光登录卡片，完美融合系统内部动态背景 */
.auth-box {
    width: 90%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(28px) saturate(190%);
    -webkit-backdrop-filter: blur(28px) saturate(190%);
    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: 28px;
    padding: 38px 34px;
    box-shadow: 
        0 24px 70px -12px rgba(99, 102, 241, 0.22),
        0 12px 36px -8px rgba(236, 72, 153, 0.18),
        0 0 0 1px rgba(255, 255, 255, 0.85),
        inset 0 1px 1px 0 rgba(255, 255, 255, 0.95);
    animation: authBoxPop 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* 未登录时隐藏主内容，使底层的动态背景纯净透出 */
body:not(.user-authenticated) .container.hero-shell {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

body.user-authenticated .container.hero-shell {
    opacity: 1;
    pointer-events: auto;
}

@keyframes authBoxPop {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.auth-header {
    text-align: center;
    margin-bottom: 24px;
}

.auth-logo-img {
    width: 58px;
    height: 58px;
    margin-bottom: 12px;
    filter: drop-shadow(0 6px 16px rgba(99, 102, 241, 0.28));
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-logo-img:hover {
    transform: scale(1.06) rotate(-3deg);
}

.auth-title {
    font-size: 23px;
    font-weight: 800;
    background: linear-gradient(135deg, #0f172a 20%, #4338ca 70%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0 0 6px 0;
    letter-spacing: -0.025em;
}

.auth-subtitle {
    font-size: 13px;
    font-weight: 500;
    color: #64748b;
    margin: 0;
}

/* 选项卡 Tab 胶囊切换 */
.auth-tabs {
    display: flex;
    background: rgba(241, 245, 249, 0.7);
    border: 1px solid rgba(226, 232, 240, 0.6);
    border-radius: 14px;
    padding: 4px;
    margin-bottom: 22px;
}

.auth-tab-btn {
    flex: 1;
    padding: 9px 0;
    font-size: 13px;
    font-weight: 600;
    color: #64748b;
    background: transparent;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-tab-btn.active {
    background: #ffffff;
    color: #0f172a;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.08);
}

/* 表单组件 */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.auth-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.auth-label {
    font-size: 12px;
    font-weight: 700;
    color: #334155;
    margin-left: 2px;
}

.auth-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.auth-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    color: #0f172a;
    background: rgba(255, 255, 255, 0.75);
    border: 1.5px solid rgba(226, 232, 240, 0.9);
    border-radius: 14px;
    outline: none;
    box-sizing: border-box;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-input:focus {
    background: #ffffff;
    border-color: #6366f1;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.14), 0 4px 14px rgba(99, 102, 241, 0.08);
}

.auth-password-toggle {
    position: absolute;
    right: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 15px;
    color: #94a3b8;
    padding: 6px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.auth-password-toggle:hover {
    color: #475569;
    background: rgba(15, 23, 42, 0.05);
}

.auth-error {
    font-size: 12px;
    color: #e11d48;
    background: rgba(255, 241, 242, 0.9);
    padding: 10px 14px;
    border-radius: 12px;
    border: 1px solid rgba(254, 205, 211, 0.8);
    display: flex;
    align-items: center;
    gap: 6px;
    animation: authShake 0.3s ease;
}

@keyframes authShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.auth-submit-btn {
    width: 100%;
    padding: 14px;
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    border: none;
    border-radius: 14px;
    cursor: pointer;
    margin-top: 6px;
    box-shadow: 0 6px 20px -2px rgba(99, 102, 241, 0.45);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-submit-btn:hover {
    box-shadow: 0 8px 25px -1px rgba(99, 102, 241, 0.55), 0 0 20px rgba(236, 72, 153, 0.3);
    transform: translateY(-1.5px);
}

.auth-submit-btn:active {
    transform: translateY(0.5px) scale(0.99);
}

.auth-footer-notice {
    font-size: 11px;
    color: #94a3b8;
    text-align: center;
    margin-top: 18px;
    line-height: 1.5;
}

/* 主系统顶部右侧的用户状态栏 */
.top-user-bar {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
}

.top-user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 9999px;
    font-size: 13px;
    font-weight: 700;
    color: #0f172a;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.top-user-avatar {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #ec4899);
    color: #ffffff;
    font-size: 11px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-logout-gate {
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    color: #ef4444;
    background: #fff;
    border: 1px solid #fecaca;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-logout-gate:hover {
    background: #ef4444;
    color: #ffffff;
    border-color: #ef4444;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25);
}

/* ===== 核心特性：多背景主题切换联动自适应 (Dynamic Theme Sync) ===== */

/* 1. 当切换为 ASCII-Flower（极客黑金/深色主题）时 */
body[data-bg-theme="ascii-flower"] .auth-gatekeeper {
    background: rgba(9, 9, 11, 0.45);
}

body[data-bg-theme="ascii-flower"] .auth-box {
    background: rgba(18, 18, 23, 0.86);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 
        0 24px 70px -12px rgba(0, 0, 0, 0.8),
        0 0 35px rgba(255, 255, 255, 0.05),
        inset 0 1px 1px 0 rgba(255, 255, 255, 0.15);
}

body[data-bg-theme="ascii-flower"] .auth-title {
    background: linear-gradient(135deg, #ffffff 20%, #e2e8f0 70%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

body[data-bg-theme="ascii-flower"] .auth-subtitle,
body[data-bg-theme="ascii-flower"] .auth-label {
    color: #94a3b8;
}

body[data-bg-theme="ascii-flower"] .auth-tabs {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.1);
}

body[data-bg-theme="ascii-flower"] .auth-tab-btn {
    color: #94a3b8;
}

body[data-bg-theme="ascii-flower"] .auth-tab-btn.active {
    background: rgba(255, 255, 255, 0.18);
    color: #ffffff;
}

body[data-bg-theme="ascii-flower"] .auth-input {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

body[data-bg-theme="ascii-flower"] .auth-input:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: #38bdf8;
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.2);
}

body[data-bg-theme="ascii-flower"] .top-user-info {
    background: rgba(18, 18, 23, 0.85);
    border-color: rgba(255, 255, 255, 0.15);
    color: #f8fafc;
}

/* 2. 当切换为 NewJeans 梦幻花瓣主题时 */
body[data-bg-theme="newjeans"] .auth-box {
    box-shadow: 
        0 24px 70px -12px rgba(236, 72, 153, 0.25),
        0 12px 36px -8px rgba(56, 189, 248, 0.2),
        0 0 0 1px rgba(255, 255, 255, 0.9),
        inset 0 1px 1px 0 rgba(255, 255, 255, 1);
}