/* ========= 基础变量 ========= */
:root {
    --auth-max-width: 420px;
    --auth-inner-hpad: 40px;
    --auth-radius: 24px;
    --auth-input-radius: 12px;
    --auth-fs-base: 16px;
    --auth-fs-small: 14px;
    --auth-label-fs: 14px;
    --auth-gap: 20px;

    --color-primary: #4f46e5;
    --color-primary-light: #6366f1;
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #cbd5e1;
    --color-background: #f1f5f9;
    --color-card-bg: #ffffff;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
}

/* ========= 基础布局 ========= */
body {
    background-color: var(--color-background);
    font-family: "LXGW WenKai Screen", 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text-primary);
    line-height: 1.6;
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: var(--auth-max-width);
    background: var(--color-card-bg);
    border-radius: var(--auth-radius);
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    overflow: hidden;
    transition: all 0.3s ease-in-out;
}

.auth-header {
    padding: 32px var(--auth-inner-hpad) 16px;
    text-align: center;
}

.auth-title {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-primary);
}

.auth-sub {
    font-size: var(--auth-fs-small);
    color: var(--color-text-secondary);
    margin-top: 8px;
}

form {
    padding: 16px var(--auth-inner-hpad) 32px;
}

/* ========= 表单元素 ========= */
.form-group {
    margin-bottom: var(--auth-gap);
}

label {
    font-weight: 500;
    font-size: var(--auth-label-fs);
    color: var(--color-text-primary);
    display: block;
    margin-bottom: 8px;
}

.form-control {
    border: 1px solid var(--color-border);
    border-radius: var(--auth-input-radius);
    padding: 12px 16px;
    font-size: var(--auth-fs-base);
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: #fff;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* 双列布局 (用于验证码) */
.dual-inline {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.dual-inline .form-control {
    flex: 1;
}

/* ========= 按钮 ========= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    border: none;
    border-radius: var(--auth-input-radius);
    cursor: pointer;
    transition: all 0.25s;
    font-size: var(--auth-fs-base);
    padding: 12px 24px;
    width: 100%;
    box-sizing: border-box;
}

.btn-primary {
    background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
    color: #fff;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2), 0 2px 4px -2px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    filter: brightness(1.1);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.2), 0 4px 6px -2px rgba(79, 70, 229, 0.2);
}

.btn-secondary {
    background: var(--color-background);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    width: auto;
    flex-shrink: 0;
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: var(--color-background);
}

/* ========= 反馈 & 附加 ========= */
.alert {
    border-radius: var(--auth-input-radius);
    padding: 12px 16px;
    font-size: var(--auth-fs-small);
    display: flex;
    gap: 10px;
    align-items: center;
    margin: 0 var(--auth-inner-hpad) 16px;
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.switch-link {
    text-align: center;
    margin-top: 24px;
    font-size: var(--auth-fs-small);
}

.switch-link a {
    color: var(--color-primary);
    font-weight: 500;
    text-decoration: none;
}

.switch-link a:hover {
    text-decoration: underline;
}

/* 密码强度 */
.pwd-meter {
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    overflow: hidden;
    margin-top: 8px;
}

.pwd-meter-bar {
    height: 100%;
    width: 0;
    background: var(--color-error);
    transition: width 0.3s, background-color 0.3s;
}
.pwd-meter-bar.strength-1 { background-color: #f97171; }
.pwd-meter-bar.strength-2 { background-color: #fbbF77; }
.pwd-meter-bar.strength-3 { background-color: #34d399; }
.pwd-meter-bar.strength-4 { background-color: #60a5fa; }


.pwd-hint {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-top: 6px;
    height: 16px;
}

.code-sent {
    font-size: 12px;
    color: #16a34a;
    margin-top: 8px;
    display: none;
}

.pwd-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 13px;
    cursor: pointer;
    color: var(--color-primary);
    user-select: none;
    font-weight: 500;
}
.form-group.password-group {
    position: relative;
}
.password-group .form-control {
    padding-right: 60px;
}


/* ========= 响应式 ========= */
@media (max-width: 480px) {
    :root {
        --auth-inner-hpad: 24px;
        --auth-fs-base: 15px;
    }
    .auth-wrapper {
        padding: 16px;
    }
    .auth-card {
        border-radius: 20px;
    }
    .auth-header {
        padding: 24px var(--auth-inner-hpad) 8px;
    }
    .auth-title {
        font-size: 26px;
    }
    form {
        padding: 16px var(--auth-inner-hpad) 24px;
    }
    .dual-inline {
        flex-direction: column;
    }
    .dual-inline .btn-secondary {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}