:root {
    --primary: #4F6EF7;
    --primary-light: #6B85F9;
    --primary-dark: #3A55D5;
    --success: #52c41a;
    --warning: #faad14;
    --danger: #ff4d4f;
    --info: #1890ff;
    --bg: #f0f2f5;
    --bg-card: #ffffff;
    --text: #1f1f1f;
    --text-secondary: #666;
    --text-muted: #999;
    --border: #e8e8e8;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --radius: 8px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background: var(--primary-dark);
    color: #fff;
    padding: 0;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px 16px;
    font-size: 18px;
    font-weight: 600;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header .logo-icon {
    font-size: 24px;
    margin-right: 8px;
}

.sidebar-nav { flex: 1; padding: 12px 0; }

.nav-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    color: rgba(255,255,255,0.75);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    color: #fff;
    background: rgba(255,255,255,0.08);
}

.nav-item.active {
    color: #fff;
    background: rgba(255,255,255,0.12);
    border-left-color: #fff;
}

.nav-item .icon { margin-right: 10px; width: 20px; text-align: center; }
.nav-item .badge {
    margin-left: auto;
    background: var(--danger);
    color: #fff;
    font-size: 12px;
    padding: 1px 6px;
    border-radius: 10px;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: 56px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: var(--shadow);
}

.topbar-title { font-size: 16px; font-weight: 600; }

.topbar-project-selector { margin-left: 12px; display: inline-block; }
.topbar-project-selector .form-select { font-size: 13px; padding: 4px 8px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-card); color: var(--text); min-width: 180px; }
.topbar-project-selector .form-select option[value=""] { color: #999; }

.topbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.topbar-user .avatar {
    width: 32px; height: 32px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

.page-body { padding: 24px; flex: 1; }

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.card-title { font-size: 16px; font-weight: 600; }

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-card .label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.stat-card .value { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-card .change { font-size: 12px; margin-top: 4px; }
.stat-card .change.up { color: var(--success); }
.stat-card .change.down { color: var(--danger); }

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    background: var(--bg);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

.data-table tr:hover td { background: rgba(79,110,247,0.04); }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: var(--font);
    transition: border-color 0.2s;
    background: #fff;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,110,247,0.15);
}

.form-textarea { min-height: 80px; resize: vertical; }

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group { flex: 1; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    gap: 6px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-light); }

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border-color: var(--border);
    color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 16px; }

/* Tags */
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.tag-primary { background: rgba(79,110,247,0.1); color: var(--primary); }
.tag-success { background: rgba(82,196,26,0.1); color: var(--success); }
.tag-warning { background: rgba(250,173,20,0.1); color: var(--warning); }
.tag-danger { background: rgba(255,77,79,0.1); color: var(--danger); }
.tag-info { background: rgba(24,144,255,0.1); color: var(--info); }

/* Phase Progress */
.phase-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.phase-item {
    flex: 1;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 16px;
    position: relative;
    overflow: hidden;
}

.phase-item .phase-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 4px;
    background: var(--primary);
    transition: width 0.3s;
}

.phase-item.current { border: 2px solid var(--primary); }
.phase-item.completed { background: rgba(82,196,26,0.05); }
.phase-item.completed .phase-fill { background: var(--success); }

.phase-name { font-weight: 600; font-size: 14px; }
.phase-date { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.phase-progress { font-size: 18px; font-weight: 700; margin-top: 8px; }
.phase-progress .unit { font-size: 12px; color: var(--text-muted); }

/* Keyword Matrix */
.matrix-table { width: 100%; border-collapse: collapse; }
.matrix-table th, .matrix-table td { padding: 6px 10px; text-align: center; font-size: 13px; border: 1px solid var(--border); }
.matrix-table th { background: var(--bg); font-weight: 600; }
.matrix-cell-yes { background: rgba(82,196,26,0.15); color: var(--success); font-weight: 600; }
.matrix-cell-no { background: rgba(255,77,79,0.08); color: var(--danger); }

/* Exception Ticket */
.ticket-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--warning);
}

.ticket-card.P0 { border-left-color: var(--danger); }
.ticket-card.P1 { border-left-color: var(--warning); }
.ticket-card.P2 { border-left-color: var(--info); }

.ticket-title { font-weight: 600; font-size: 15px; }
.ticket-meta { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

.ticket-status-flow {
    display: flex;
    gap: 4px;
    margin-top: 8px;
}

.ticket-status-flow .step {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    background: var(--bg);
    color: var(--text-muted);
}

.ticket-status-flow .step.active { background: var(--primary); color: #fff; }
.ticket-status-flow .step.done { background: rgba(82,196,26,0.1); color: var(--success); }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.modal-overlay.show { opacity: 1; visibility: visible; }

.modal {
    background: var(--bg-card);
    border-radius: 12px;
    width: 600px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.modal-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 12px; margin-top: 20px; }

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 40px;
    width: 380px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.login-logo {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-error {
    background: rgba(255,77,79,0.08);
    color: var(--danger);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
    display: none;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 2000;
}

.toast {
    background: var(--bg-card);
    border-radius: 8px;
    padding: 12px 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    transform: translateX(100%);
    transition: transform 0.3s;
}

.toast.show { transform: translateX(0); }
.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

/* Client Portal specific */
.portal-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 32px 24px;
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.portal-header .project-name { font-size: 22px; font-weight: 700; }
.portal-header .project-meta { font-size: 14px; opacity: 0.8; margin-top: 4px; }

/* Topbar notification badge */
.topbar-badge {
    display: inline-block;
    background: var(--danger);
    color: #fff;
    font-size: 11px;
    padding: 1px 5px;
    border-radius: 10px;
    position: relative;
    top: -2px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 0; overflow: hidden; }
    .sidebar.mobile-open { width: 220px; }
    .page-body { padding: 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { flex-direction: column; }
}