/* ============================================================
   后台登录页 - 深色高端毛玻璃风格
   ============================================================ */

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

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent: #a78bfa;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-hint: #64748b;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(148, 163, 184, 0.15);
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(148, 163, 184, 0.2);
    --input-focus: #6366f1;
    --error-bg: rgba(239, 68, 68, 0.1);
    --error-border: rgba(239, 68, 68, 0.3);
    --error-text: #fca5a5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    background: #0f172a;
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* ========== 背景装饰 ========== */
.bg-decoration {
    position: fixed;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    top: -150px;
    left: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
    bottom: -100px;
    right: -80px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #a78bfa, #ec4899);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.25;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* ========== 登录卡片 ========== */
.login-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 40px 36px;
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    animation: cardIn 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ========== Logo 区域 ========== */
.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.logo-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4); }
    50% { box-shadow: 0 8px 32px rgba(99, 102, 241, 0.6); }
}

.login-logo h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    background: linear-gradient(135deg, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== 错误提示 ========== */
.login-error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* ========== 表单 ========== */
.login-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group label i {
    margin-right: 6px;
    color: var(--primary-light);
}

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

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--text-hint);
    font-size: 14px;
    pointer-events: none;
    transition: color 0.2s;
}

.input-wrapper input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
}

.input-wrapper input::placeholder {
    color: var(--text-hint);
}

.input-wrapper input:focus {
    border-color: var(--input-focus);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.input-wrapper input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
    color: var(--primary-light);
}

/* 密码显示切换 */
.toggle-password {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-hint);
    cursor: pointer;
    padding: 6px;
    font-size: 14px;
    transition: color 0.2s;
}

.toggle-password:hover {
    color: var(--text-secondary);
}

/* 验证码 */
.captcha-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.captcha-input {
    flex: 1;
}

.captcha-img {
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    cursor: pointer;
    transition: opacity 0.2s;
}

.captcha-img:hover {
    opacity: 0.8;
}

/* ========== 登录按钮 ========== */
.login-btn {
    margin-top: 8px;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 2px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.login-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 0.5s;
}

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

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.45);
}

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

.login-btn i {
    font-size: 14px;
    transition: transform 0.3s;
}

.login-btn:hover i {
    transform: translateX(4px);
}

/* ========== 底部 ========== */
.login-footer {
    margin-top: 24px;
    text-align: center;
}

.login-footer p {
    font-size: 12px;
    color: var(--text-hint);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.login-footer i {
    color: var(--primary-light);
}

/* ========== 响应式 ========== */
@media (max-width: 480px) {
    .login-card {
        padding: 28px 20px;
        border-radius: 16px;
        margin: 0 12px;
    }
    .logo-icon {
        width: 52px;
        height: 52px;
        font-size: 22px;
        border-radius: 14px;
    }
    .login-logo {
        margin-bottom: 24px;
    }
    .login-logo h1 {
        font-size: 20px;
    }
    .login-logo p {
        font-size: 13px;
    }
    .form-group {
        gap: 14px;
        margin-bottom: 0;
    }
    .form-group label {
        font-size: 12px;
        margin-bottom: 6px;
    }
    .input-wrapper input {
        padding: 11px 12px 11px 38px;
        font-size: 14px;
        border-radius: 8px;
    }
    .input-icon {
        left: 12px;
        font-size: 13px;
    }
    .login-btn {
        padding: 12px;
        font-size: 14px;
        border-radius: 8px;
    }
    /* 验证码区域：小屏垂直排列 */
    .captcha-row {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 8px !important;
    }
    .captcha-row input {
        width: 100% !important;
    }
    .captcha-row img {
        height: 42px !important;
        align-self: flex-start;
    }
    .auth-tabs {
        margin-bottom: 20px;
    }
    .auth-tab {
        padding: 10px 8px;
        font-size: 14px;
    }
}

@media (max-width: 360px) {
    .login-card {
        padding: 24px 16px;
    }
    .login-logo h1 {
        font-size: 18px;
    }
    .form-group {
        gap: 12px;
    }
}