:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a2332;
    --bg-card: #1e2a3a;
    --accent-green: #00c853;
    --accent-red: #ff5252;
    --accent-blue: #448aff;
    --accent-amber: #ffab00;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --border: #2d3a4d;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* 页面切换：仅显示带 active 的页面 */
.app-container {
    position: relative;
    min-height: 100vh;
}

.app-container > .page {
    display: none;
    min-height: 100vh;
}

.app-container > .page.active {
    display: flex;
    flex-direction: column;
}

/* 认证页面 */
#auth-page {
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f1419 0%, #1a2332 50%, #0d1117 100%);
}

.auth-container {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.auth-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.auth-tabs .tab {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.auth-tabs .tab.active {
    background: var(--accent-blue);
    color: white;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.auth-form.hidden {
    display: none !important;
}

.auth-form input {
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
}

.auth-form input::placeholder {
    color: var(--text-secondary);
}

.auth-form input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.auth-form button {
    padding: 0.9rem;
    background: var(--accent-blue);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.auth-form button:hover {
    background: #5a9aff;
}

.error-msg {
    margin-top: 1rem;
    color: var(--accent-red);
    font-size: 0.9rem;
    min-height: 1.2rem;
}

/* 主应用 */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.25rem;
}

.btn-icon:hover {
    color: var(--text-primary);
}

.btn-outline {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-outline:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
}

#main-page.active,
#project-detail-page.active {
    flex-direction: column;
}

#main-page .app-main,
#project-detail-page .app-main {
    flex: 1;
}

.app-main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* 总览卡片 */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.card {
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.card .label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.card .value {
    font-size: 1.5rem;
    font-weight: 600;
}

.total-income .value { color: var(--accent-green); }
.total-expense .value { color: var(--accent-red); }
.total-balance .value { color: var(--accent-amber); }

/* 项目列表 */
.projects-section {
    margin-top: 1rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 表格 */
.table-wrapper {
    overflow-x: auto;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.data-table tbody tr:hover {
    background: rgba(255,255,255,0.02);
}

.project-link {
    color: var(--accent-blue);
    text-decoration: none;
}

.project-link:hover {
    text-decoration: underline;
}

.data-table .income { color: var(--accent-green); }
.data-table .expense { color: var(--accent-red); }
.data-table .positive { color: var(--accent-green); }
.data-table .negative { color: var(--accent-red); }

.btn-delete {
    background: rgba(255, 82, 82, 0.2);
    color: var(--accent-red);
    border: none;
    padding: 0.35rem 0.6rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-delete:hover {
    background: rgba(255, 82, 82, 0.4);
}

.btn-sm { font-size: 0.85rem; }

/* 项目详情 */
.detail-summary {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.detail-summary strong.positive { color: var(--accent-green); }
.detail-summary strong.negative { color: var(--accent-red); }

.add-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.add-form input {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.add-form input[type="number"] { width: 100px; }
.add-form input[type="text"] { flex: 1; min-width: 120px; }

.add-form button {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
}

.add-form #btn-submit-trans {
    background: var(--accent-blue);
    color: white;
    border: none;
}

.add-form #btn-cancel-trans {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.section-header .btn-income,
.section-header .btn-expense {
    padding: 0.5rem 1rem;
    margin-left: 0.5rem;
}

.btn-primary {
    padding: 0.6rem 1.2rem;
    background: var(--accent-blue);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #5a9aff;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.project-card {
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.project-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.project-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.project-card .balance {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0.5rem 0;
}

.project-card .balance.positive { color: var(--accent-green); }
.project-card .balance.negative { color: var(--accent-red); }
.project-card .balance.zero { color: var(--text-secondary); }

.project-card .meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 模态框 */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.hidden {
    display: none !important;
}

.hidden {
    display: none !important;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content.small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 1.1rem;
}

.btn-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.btn-close:hover {
    color: var(--text-primary);
}

.modal-summary {
    display: flex;
    gap: 2rem;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
}

.modal-summary .stat {
    flex: 1;
}

.modal-summary .stat span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.modal-summary .stat strong {
    font-size: 1.1rem;
}

.modal-summary .stat.highlight strong {
    color: var(--accent-amber);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    padding: 1rem 1.5rem;
}

.btn-income, .btn-expense {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 500;
}

.btn-income {
    background: rgba(0, 200, 83, 0.2);
    color: var(--accent-green);
}

.btn-income:hover {
    background: rgba(0, 200, 83, 0.3);
}

.btn-expense {
    background: rgba(255, 82, 82, 0.2);
    color: var(--accent-red);
}

.btn-expense:hover {
    background: rgba(255, 82, 82, 0.3);
}

.transactions-list {
    padding: 1rem 1.5rem 1.5rem;
}

.transactions-list h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.transaction-item .amount.income { color: var(--accent-green); }
.transaction-item .amount.expense { color: var(--accent-red); }

.transaction-item .reason {
    flex: 1;
    margin: 0 1rem;
    font-size: 0.9rem;
}

.transaction-item .date {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 表单 */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

#project-form, #transaction-form, #settings-form {
    padding: 1.5rem;
}

.btn-primary.full {
    width: 100%;
    padding: 0.85rem;
    margin-top: 0.5rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .summary-cards {
        grid-template-columns: 1fr;
    }
    .app-main {
        padding: 1rem;
    }
    .projects-grid {
        grid-template-columns: 1fr;
    }
}