/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-main: #f3f4f6;
    --bg-card: #ffffff;
    --bg-input: #f9fafb;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-main);
    min-height: 100vh;
}

/* ==================== Landing 页面样式 ==================== */
.landing-body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.landing-container {
    width: 100%;
    max-width: 480px;
}

.landing-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 48px 40px;
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-section {
    text-align: center;
    margin-bottom: 36px;
}

.logo-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: block;
}

.landing-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.landing-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.login-section {
    margin-bottom: 32px;
}

.login-icon {
    text-align: center;
    font-size: 48px;
    margin-bottom: 16px;
}

.login-section h2 {
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-hint {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.input-group input {
    width: 100%;
    padding: 14px 50px 14px 16px;
    font-size: 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--bg-input);
    transition: all 0.3s ease;
    outline: none;
}

.input-group input:focus {
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.input-group input::placeholder {
    color: var(--text-light);
}

.toggle-pwd {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.toggle-pwd:hover {
    background-color: var(--bg-main);
}

.btn-login {
    position: relative;
    width: 100%;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-login:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-login:active:not(:disabled) {
    transform: translateY(0);
}

.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.hidden {
    display: none !important;
}

.error-msg {
    margin-top: 16px;
    padding: 12px 16px;
    background-color: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fecaca;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
    animation: shake 0.4s ease;
}

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

.footer-section {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.copyright {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.version {
    font-size: 11px;
    color: var(--text-light);
    opacity: 0.7;
}

/* ==================== 功能选择页样式 ==================== */
.home-body {
    background: var(--bg-main);
    min-height: 100vh;
}

.home-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 头部 */
.home-header {
    background: var(--bg-card);
    padding: 20px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    border-radius: 0 0 20px 20px;
    margin-bottom: 40px;
}

.header-content h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

.btn-logout {
    padding: 8px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-logout:hover {
    background-color: #fee2e2;
    color: var(--error-color);
    border-color: #fecaca;
}

/* 主体 */
.home-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 28px;
}

/* 功能卡片 */
.feature-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 32px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card.card-exit {
    transform: scale(0.95);
    opacity: 0.5;
}

.card-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.icon-emoji {
    font-size: 36px;
}

.card-content h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.card-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.feature-tag {
    padding: 4px 12px;
    font-size: 12px;
    color: var(--primary-color);
    background-color: #eff6ff;
    border-radius: 20px;
    font-weight: 500;
}

.card-action {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.action-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

.arrow-icon {
    font-size: 20px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.feature-card:hover .arrow-icon {
    transform: translateX(8px);
}

/* 系统信息 */
.system-info {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px 32px;
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    box-shadow: var(--shadow-sm);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.info-value {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.status-ok {
    color: var(--success-color);
}

/* 页脚 */
.home-footer {
    padding: 32px 0;
    text-align: center;
}

.home-footer p {
    font-size: 13px;
    color: var(--text-light);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .landing-card {
        padding: 32px 24px;
        border-radius: 16px;
    }

    .logo-icon {
        font-size: 40px;
    }

    .landing-title {
        font-size: 24px;
    }

    .home-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
        padding: 16px;
    }

    .home-container {
        padding: 0 16px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .feature-card {
        padding: 24px;
    }

    .system-info {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .landing-card {
        padding: 24px 20px;
    }

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

    .input-group input {
        padding: 12px 44px 12px 12px;
        font-size: 15px;
    }

    .btn-login {
        padding: 12px 20px;
        font-size: 15px;
    }
}