/* Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border: #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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 1rem;
    box-shadow: var(--shadow-lg);
}

.header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.subtitle {
    text-align: center;
    opacity: 0.9;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}

.back-link {
    color: white;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 1rem;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.back-link:hover {
    opacity: 1;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Summary Cards */
.summary-section {
    background: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-sm);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card h3 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.card .amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.amount.balance {
    color: var(--success);
}

.amount.gain {
    color: var(--success);
}

.amount.loss {
    color: var(--danger);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Panel */
.panel {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.panel h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-danger {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
}

.btn-danger:hover {
    background: #dc2626;
}

/* Portfolios Grid */
.portfolios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.portfolio-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 2px solid var(--border);
    transition: transform 0.2s, border-color 0.2s;
    cursor: pointer;
}

.portfolio-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.portfolio-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.portfolio-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.portfolio-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.portfolio-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Stocks Table */
.stocks-table {
    overflow-x: auto;
}

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

thead {
    background: var(--bg-primary);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

tr:hover {
    background: var(--bg-primary);
}

.stock-symbol {
    font-weight: 700;
    color: var(--primary);
}

.stock-name {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.gain {
    color: var(--success);
    font-weight: 600;
}

.loss {
    color: var(--danger);
    font-weight: 600;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .summary-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}