:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #64748b;
    --accent: #0ea5e9;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
    --radius: 16px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --font-family: 'Outfit', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    padding-bottom: 80px; /* Space for bottom nav */
}

/* Header */
.app-header {
    background: var(--surface);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    position: sticky;
    top: 0;
    z-index: 50;
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

#current-date {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Main Content */
#main-content {
    padding: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Bottom Nav */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem;
    box-shadow: 0 -1px 3px 0 rgb(0 0 0 / 0.1);
    z-index: 50;
    padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
}

.nav-btn {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-family: var(--font-family);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
}

.nav-btn svg {
    width: 24px;
    height: 24px;
}

.nav-btn.active {
    color: var(--primary);
}

/* Cards */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.card h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-main);
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-card {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.stat-card.highlight {
    background: var(--primary);
    color: white;
}

.stat-card.highlight .stat-value,
.stat-card.highlight .stat-label {
    color: white;
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-family: var(--font-family);
    font-size: 1rem;
    background: var(--background);
    transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 1rem;
}

.btn-primary:active {
    background: var(--primary-dark);
    transform: scale(0.98);
}

/* Lists */
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.list-item:last-child {
    border-bottom: none;
}

.list-item-main {
    font-weight: 500;
}

.list-item-sub {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.amount-positive { color: var(--success); }
.amount-negative { color: var(--danger); }

/* Loading */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}