/* 登录页令牌（--login-*）统一由 theme.css 按主题提供，本文件不再重复定义，
   避免出现与主站不一致的私有蓝色（旧 #2563eb 已移除） */

* {
    box-sizing: border-box;
}

.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    position: relative;
    overflow-y: auto;
    overflow-x: hidden;
    background-color: #e8ecf4;
    padding: 20px 0;
}

.login-background {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-image: url('../images/login-bg.png');
    z-index: 0;
    transition: opacity 0.5s ease;
}

.login-background:not([style*="background-image"]) {
    /* Keep default background-image if not overridden by JS */
}

/* Centered narrow login card */
.login-wrapper {
    position: relative;
    z-index: 10;
    width: min(420px, 90vw);
    max-width: 420px;
    margin: 40px 20px;
    background: var(--login-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: visible;
}

/* 3D cat sticker attached to top-left corner of the card */
.login-cat {
    position: absolute;
    top: -90px;
    left: -48px;
    width: 140px;
    height: auto;
    z-index: 20;
    filter: drop-shadow(0 12px 20px rgba(0, 0, 0, 0.25));
    pointer-events: none;
    user-select: none;
    animation: catBob 3.5s ease-in-out infinite;
}

@keyframes catBob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

/* Decorative gradient accent at top of card */
.login-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--brand-gradient);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    z-index: -1;
}

.login-panel {
    padding: 88px 40px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.login-panel-header {
    margin-bottom: 28px;
    text-align: center;
}

.login-panel-header h2 {
    font-size: clamp(20px, 4vw, 26px);
    font-weight: 700;
    color: var(--login-text);
    margin: 0 0 8px 0;
    letter-spacing: 0.5px;
}

.login-panel-header p {
    font-size: clamp(12px, 2.5vw, 13px);
    color: var(--login-text-secondary);
    margin: 0;
}

.login-form .form-group {
    margin-bottom: 18px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--login-text);
    font-size: 14px;
}

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

.input-icon {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--login-text-muted);
    pointer-events: none;
}

.login-form input {
    width: 100%;
    height: var(--control-height-lg);
    /* 已移除输入框左侧装饰图标，使用标准 12px 内边距；
       密码框右侧保留眼睛切换按钮，单独留出 40px */
    padding: 0 12px;
    border: 1px solid var(--login-border);
    border-radius: var(--radius);
    font-size: var(--fs-lg);
    transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
    background: var(--login-bg);
    color: var(--login-text);
    font-family: inherit;
}

/* 密码框：Chromium 系浏览器使用原生 reveal 眼睛（浏览器自行预留空间，无需自定义 padding）；
   Firefox/Safari 无原生能力，JS 注入兜底按钮时为 .input-wrapper 加 has-reveal-toggle 类留位 */
.input-wrapper.has-reveal-toggle input[type="password"] {
    padding-right: 40px;
}

.login-form input:hover {
    border-color: var(--login-text-muted);
}

.login-form input:focus {
    outline: none;
    border-color: var(--login-border-focus);
    background: var(--login-white);
    box-shadow: 0 0 0 3px rgba(15, 108, 189, 0.12);
}

.login-form input::placeholder {
    color: var(--login-text-muted);
}

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

.toggle-password {
    position: absolute;
    right: 14px;
    cursor: pointer;
    color: var(--login-text-muted);
    display: flex;
    align-items: center;
    transition: color 0.2s;
    user-select: none;
}

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

.toggle-password:hover svg {
    stroke: var(--login-text-secondary);
}

.btn-login {
    width: 100%;
    height: var(--control-height-lg);
    padding: 0 20px;
    border: none;
    border-radius: var(--radius);
    font-size: var(--fs-lg);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--dur-base) var(--ease-out);
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--login-primary);
    color: #fff !important;
    font-family: inherit;
    /* 白色文字与品牌色背景拉开对比度，增强可读性 */
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}

/* 注意：内部 span 类名 .btn-text 与 theme.css 全局"文字按钮"类同名，
   全局规则 color:var(--brand) !important 会把登录文字染成品牌蓝、
   落在蓝底按钮上导致"文字消失"。这里用 .btn-login 作用域 + 双类选择器
   提升特异性并显式 !important，两态都压过全局 .btn-text */
.btn-login .btn-text,
.btn-login .btn-icon {
    color: #fff !important;
}

.btn-login:hover:not(:disabled) {
    background: var(--login-primary-hover);
}

.btn-login:active:not(:disabled) {
    background: var(--login-primary-hover);
}

.btn-login:disabled {
    /* 禁用态：浅灰底 + 深灰字，避免白字与中灰底混在一起看不清；
       加 !important 压过 theme.css 的 button[type="submit"] 蓝底规则 */
    background: #d3d8df !important;
    border-color: #d3d8df !important;
    color: #5f6b7a !important;
    cursor: not-allowed;
    opacity: 1;
    text-shadow: none;
}

.btn-login:disabled .btn-text,
.btn-login:disabled .btn-icon {
    color: #5f6b7a !important;
}

.btn-login .btn-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.2s;
}

.btn-login:hover:not(:disabled) .btn-icon {
    transform: translateX(4px);
}

.login-panel-footer {
    text-align: center;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--login-border);
}

.login-panel-footer p {
    margin: 0;
    font-size: 12px;
    color: var(--login-text-muted);
}

/* 关键兜底：内联 <svg hidden> 在部分浏览器中会被 SVG UA 默认 display 覆盖而仍然显示，
   作者样式表显式隐藏（登录按钮 spinner/箭头、班级卡片 spinner 也依赖此规则） */
.btn-login svg[hidden],
.class-chip svg[hidden],
.toggle-password svg[hidden] {
    display: none !important;
}

/* ========== 密码 reveal 兜底按钮（仅 Firefox/Safari 等无原生眼睛的浏览器，由 JS 注入） ========== */
/* Chromium 系不注入此按钮，直接使用系统原生 reveal，故这里不需要任何遮罩 */
button.toggle-password {
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    color: var(--login-text-muted);
    transition: color 0.2s, background-color 0.2s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

button.toggle-password:hover {
    color: var(--login-text-secondary);
    background: rgba(15, 108, 189, 0.06);
}

button.toggle-password:active {
    color: var(--login-primary);
}

button.toggle-password:focus-visible {
    outline: 2px solid var(--login-border-focus);
    outline-offset: 1px;
}

/* ========== 多班级选择区 ========== */
.class-select-group {
    margin-bottom: 18px;
    animation: classSelectIn 0.25s var(--ease-out, ease);
}

@keyframes classSelectIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.class-select-hint {
    margin: -2px 0 12px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--login-text-secondary);
}

.class-chip-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 264px;
    overflow-y: auto;
    padding: 2px 2px 4px;
    margin: 0 -2px;
}

.class-chip {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    min-height: 46px;
    padding: 8px 14px;
    border: 1px solid var(--login-border);
    border-radius: var(--radius);
    background: var(--login-white);
    color: var(--login-text);
    font-family: inherit;
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    transition: border-color var(--dur-base, 0.15s) ease,
                background-color var(--dur-base, 0.15s) ease,
                box-shadow var(--dur-base, 0.15s) ease,
                transform 0.1s ease;
}

.class-chip:hover {
    border-color: var(--login-border-focus);
    background: rgba(15, 108, 189, 0.05);
    box-shadow: 0 0 0 3px rgba(15, 108, 189, 0.1);
}

.class-chip:active {
    transform: scale(0.995);
}

.class-chip:focus-visible {
    outline: none;
    border-color: var(--login-border-focus);
    box-shadow: 0 0 0 3px rgba(15, 108, 189, 0.16);
}

.class-chip:disabled {
    cursor: default;
    opacity: 0.7;
}

.class-chip .chip-code {
    flex-shrink: 0;
    min-width: 52px;
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--login-primary);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    letter-spacing: 0.3px;
}

.class-chip .chip-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

.class-chip .chip-arrow {
    flex-shrink: 0;
    display: flex;
    color: var(--login-text-muted);
    transition: transform 0.2s, color 0.2s;
}

.class-chip:hover .chip-arrow {
    color: var(--login-primary);
    transform: translateX(2px);
}

.class-chip .chip-spinner {
    flex-shrink: 0;
    display: none;
    color: var(--login-primary);
}

.class-chip.is-loading {
    border-color: var(--login-border-focus);
    background: rgba(15, 108, 189, 0.05);
}

.class-chip.is-loading .chip-arrow,
.class-chip.is-loading .chip-name {
    opacity: 0.55;
}

.class-chip.is-loading .chip-spinner {
    display: flex;
    animation: chipSpin 0.8s linear infinite;
}

@keyframes chipSpin {
    to { transform: rotate(360deg); }
}

/* 返回账号链接按钮 */
.btn-back-account {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 12px;
    padding: 4px 6px;
    border: none;
    background: transparent;
    color: var(--login-text-muted);
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
    border-radius: 6px;
    transition: color 0.2s, background-color 0.2s;
}

.btn-back-account:hover {
    color: var(--login-primary);
    background: rgba(15, 108, 189, 0.06);
}

.btn-back-account:focus-visible {
    outline: 2px solid var(--login-border-focus);
    outline-offset: 1px;
}

.btn-back-account svg {
    transition: transform 0.2s;
}

.btn-back-account:hover svg {
    transform: translateX(-2px);
}

/* 主登录按钮加载旋转图标 */
.btn-login .btn-spinner.spinning {
    animation: chipSpin 0.8s linear infinite;
}

.notification {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    z-index: 9999;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.notification.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.notification.error {
    background: var(--login-error);
}

.notification.info {
    background: var(--login-primary);
}

.notification.success {
    background: #10b981;
}

/* ========== Responsive Breakpoints ========== */

/* Large tablets and small laptops */
@media (max-width: 1024px) {
    .login-wrapper {
        width: min(400px, 85vw);
        margin: 30px 20px;
    }

    .login-cat {
        width: 130px;
        top: -82px;
        left: -42px;
    }

    .login-panel {
        padding: 80px 36px 28px;
    }
}

/* Tablets and large phones */
@media (max-width: 768px) {
    .login-wrapper {
        width: min(380px, 88vw);
        margin: 80px 20px 20px;
    }

    .login-cat {
        top: -72px;
        left: 50%;
        transform: translateX(-50%);
        width: 120px;
    }

    .login-panel {
        padding: 72px 28px 24px;
    }

    .login-panel-header {
        margin-bottom: 24px;
    }

    .login-panel-header h2 {
        font-size: clamp(18px, 5vw, 22px);
    }

    .login-form .form-group {
        margin-bottom: 16px;
    }

    .btn-login {
        padding: 12px 18px;
    }
}

/* Small phones */
@media (max-width: 480px) {
    .login-wrapper {
        width: min(340px, 92vw);
        margin: 70px 16px 20px;
        border-radius: var(--radius-lg);
    }

    .login-cat {
        width: 100px;
        top: -58px;
    }

    .login-wrapper::before {
        height: 48px;
    }

    .login-panel {
        padding: 64px 22px 20px;
    }

    .login-panel-header {
        margin-bottom: 20px;
    }

    .login-panel-header h2 {
        font-size: 20px;
    }

    .login-panel-header p {
        font-size: 12px;
    }

    .login-form input {
        padding: 11px 12px;
        font-size: 13px;
    }

    .input-icon {
        left: 12px;
        width: 16px;
        height: 16px;
    }

    .btn-login {
        padding: 12px 16px;
        font-size: 14px;
    }

    .login-panel-footer {
        margin-top: 20px;
        padding-top: 16px;
    }
}

/* Very small phones */
@media (max-width: 360px) {
    .login-wrapper {
        width: calc(100vw - 24px);
        margin: 60px 12px 16px;
    }

    .login-cat {
        width: 90px;
        top: -52px;
    }

    .login-panel {
        padding: 58px 18px 16px;
    }
}

/* Landscape mode on phones */
@media (max-height: 500px) and (orientation: landscape) {
    .login-wrapper {
        margin: 10px auto;
    }

    .login-cat {
        width: 80px;
        top: -44px;
    }

    .login-panel {
        padding: 52px 24px 16px;
    }

    .login-panel-header {
        margin-bottom: 16px;
    }

    .login-panel-header h2 {
        font-size: 18px;
    }
}

/* High DPI / Retina optimization */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .login-cat {
        filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.2));
    }
}