/* ========== 登录页样式 - 校园清新风 ========== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: linear-gradient(145deg, #f0f9ff 0%, #e0f2fe 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* 主卡片容器 */
.login-container {
    width: 100%;
    max-width: 420px;
    animation: fadeInUp 0.5s ease;
}

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

/* Logo 区域 */
.login-logo {
    text-align: center;
    margin-bottom: 24px;
}

.login-logo img {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.login-logo h1 {
    font-size: 2rem;
    font-weight: 650;
    color: #1e293b;
    margin-top: 12px;
    letter-spacing: 2px;
}

.login-logo p {
    color: #64748b;
    font-size: 0.9rem;
    margin-top: 6px;
}

/* 卡片主体 */
.login-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 32px;
    padding: 36px 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08), 0 6px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

/* 选项卡（登录/注册） */
.login-tabs {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 12px;
}

.login-tab {
    flex: 1;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: #94a3b8;
    cursor: pointer;
    padding: 8px 0;
    transition: all 0.2s;
    border-bottom: 3px solid transparent;
    margin-bottom: -14px;
}

.login-tab.active {
    color: #3b82f6;
    border-bottom-color: #3b82f6;
}

.login-tab:hover {
    color: #1e293b;
}

/* 表单 */
.login-form {
    display: block;
}

.login-form.hidden {
    display: none;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: #475569;
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    font-size: 1rem;
    background: white;
    border: 1.5px solid #e2e8f0;
    border-radius: 18px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder {
    color: #a0aec0;
    font-size: 0.9rem;
}

/* 学号输入框特殊样式 */
.input-with-prefix {
    display: flex;
    align-items: center;
    background: white;
    border: 1.5px solid #e2e8f0;
    border-radius: 18px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-with-prefix:focus-within {
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.input-with-prefix .prefix {
    padding-left: 18px;
    color: #64748b;
    font-weight: 500;
    font-size: 0.9rem;
}

.input-with-prefix input {
    border: none;
    padding: 14px 18px 14px 6px;
    background: transparent;
    box-shadow: none;
}

.input-with-prefix input:focus {
    box-shadow: none;
}

/* 提示文字 */
.form-hint {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: 6px;
    margin-left: 6px;
}

/* 登录按钮 */
.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    border: none;
    border-radius: 60px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.2s;
    margin-top: 12px;
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(59, 130, 246, 0.4);
}

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

/* 页脚 */
.login-footer {
    text-align: center;
    margin-top: 24px;
    color: #94a3b8;
    font-size: 0.8rem;
}

.login-footer a {
    color: #3b82f6;
    text-decoration: none;
}

/* 错误提示 */
.error-message {
    background: #fee2e2;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    border-left: 4px solid #dc2626;
    display: none;
}

.error-message.show {
    display: block;
}

/* 成功提示 */
.success-message {
    background: #d1fae5;
    color: #059669;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    border-left: 4px solid #059669;
    display: none;
}

.success-message.show {
    display: block;
}

/* 加载状态 */
.login-btn.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* 暗色模式适配（可选） */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
    }

    .login-card {
        background: rgba(30, 41, 59, 0.9);
        border-color: rgba(51, 65, 85, 0.5);
    }

    .login-logo h1 {
        color: #f1f5f9;
    }

    .login-tab {
        color: #64748b;
    }

    .login-tab.active {
        color: #60a5fa;
        border-bottom-color: #60a5fa;
    }

    .form-group label {
        color: #cbd5e1;
    }

    .form-group input,
    .input-with-prefix {
        background: #1e293b;
        border-color: #475569;
        color: #f1f5f9;
    }

    .form-group input::placeholder {
        color: #64748b;
    }

    .input-with-prefix .prefix {
        color: #94a3b8;
    }

    .form-hint {
        color: #64748b;
    }
}

/* ========== 校园验证弹窗样式 ========== */
.verification-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.verification-modal {
    background: white;
    border-radius: 28px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    animation: slideUp 0.3s ease;
}

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

.verification-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid #f1f5f9;
    font-weight: 650;
    font-size: 1.2rem;
    color: #1e293b;
}

.verification-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #94a3b8;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.verification-close:hover {
    color: #1e293b;
}

.verification-body {
    padding: 24px;
}

.verification-tip {
    color: #64748b;
    font-size: 0.9rem;
    margin-bottom: 20px;
    text-align: center;
}

.verify-question {
    margin-bottom: 20px;
}

.verify-question label {
    display: block;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 6px;
}

.verify-hint {
    display: inline-block;
    font-size: 0.75rem;
    color: #94a3b8;
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 20px;
    margin-left: 8px;
}

.verify-question input {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    background: white;
    border: 1.5px solid #e2e8f0;
    border-radius: 14px;
    outline: none;
    transition: border-color 0.2s;
    margin-top: 6px;
}

.verify-question input:focus {
    border-color: #3b82f6;
}

.verification-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.verify-cancel-btn,
.verify-submit-btn {
    flex: 1;
    padding: 12px;
    border-radius: 40px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.verify-cancel-btn {
    background: transparent;
    border: 1.5px solid #e2e8f0;
    color: #64748b;
}

.verify-cancel-btn:hover {
    background: #f8fafc;
}

.verify-submit-btn {
    background: #3b82f6;
    border: none;
    color: white;
}

.verify-submit-btn:hover {
    background: #2563eb;
}

.verify-submit-btn:disabled {
    opacity: 0.6;
    pointer-events: none;
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
    .verification-modal {
        background: #1e293b;
    }
    
    .verification-header {
        color: #f1f5f9;
        border-bottom-color: #334155;
    }
    
    .verification-close {
        color: #64748b;
    }
    
    .verification-close:hover {
        color: #f1f5f9;
    }
    
    .verify-question label {
        color: #f1f5f9;
    }
    
    .verify-question input {
        background: #0f172a;
        border-color: #475569;
        color: #f1f5f9;
    }
    
    .verify-hint {
        background: #334155;
        color: #94a3b8;
    }
    
    .verify-cancel-btn {
        border-color: #475569;
        color: #94a3b8;
    }
    
    .verify-cancel-btn:hover {
        background: #1e293b;
    }
}

/* Minimal theme layer */
:root {
    color-scheme: light;
    --bg: #f6f7f9;
    --surface: #ffffff;
    --surface-2: #f2f4f7;
    --text: #111827;
    --text-soft: #374151;
    --muted: #6b7280;
    --border: #e5e7eb;
    --border-strong: #d1d5db;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #eef4ff;
    --danger: #dc2626;
    --success: #059669;
    --shadow: 0 18px 44px rgba(17, 24, 39, 0.08);
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f1115;
    --surface: #171a21;
    --surface-2: #20242c;
    --text: #f3f4f6;
    --text-soft: #d1d5db;
    --muted: #9ca3af;
    --border: #2b3039;
    --border-strong: #3a414d;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: rgba(96, 165, 250, 0.14);
    --danger: #f87171;
    --success: #34d399;
    --shadow: 0 20px 48px rgba(0, 0, 0, 0.3);
}

body {
    background: var(--bg) !important;
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.login-container {
    max-width: 400px;
}

.login-logo {
    margin-bottom: 20px;
}

.login-logo img {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    box-shadow: none;
}

.login-logo h1 {
    color: var(--text);
    font-family: inherit;
    letter-spacing: 0;
}

.login-logo p,
.login-footer,
.form-hint {
    color: var(--muted);
}

.login-card,
.verification-modal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    backdrop-filter: none;
}

.login-tabs {
    border-bottom-color: var(--border);
    gap: 8px;
}

.login-tab {
    color: var(--muted);
    border-bottom-color: transparent;
    font-size: 1rem;
}

.login-tab:hover,
.login-tab.active {
    color: var(--accent);
}

.login-tab.active {
    border-bottom-color: var(--accent);
}

.form-group label,
.verification-header,
.verify-question label {
    color: var(--text);
}

.form-group input,
.input-with-prefix,
.verify-question input {
    background: var(--surface);
    border-color: var(--border);
    color: var(--text);
    border-radius: var(--radius-md);
}

.form-group input:focus,
.input-with-prefix:focus-within,
.verify-question input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.input-with-prefix .prefix,
.verification-tip,
.verification-close {
    color: var(--muted);
}

.login-btn,
.verify-submit-btn {
    background: var(--accent);
    border-radius: var(--radius-md);
    box-shadow: none;
}

.login-btn:hover,
.verify-submit-btn:hover {
    background: var(--accent-hover);
    transform: none;
    box-shadow: none;
}

.verify-cancel-btn {
    background: var(--surface);
    border-color: var(--border);
    color: var(--text-soft);
    border-radius: var(--radius-md);
}

.verify-cancel-btn:hover,
.verification-close:hover {
    background: var(--surface-2);
    color: var(--text);
}

.verification-header {
    border-bottom-color: var(--border);
}

.verify-hint {
    background: var(--surface-2);
    color: var(--muted);
}

.error-message {
    background: rgba(220, 38, 38, 0.1);
    border-left-color: var(--danger);
    color: var(--danger);
}

.success-message {
    background: rgba(5, 150, 105, 0.1);
    border-left-color: var(--success);
    color: var(--success);
}

.theme-toggle {
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.06);
}

.theme-toggle:hover {
    background: var(--surface-2);
}

.theme-toggle-floating {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 1000;
}