:root {
    --bg-app: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger: #ef4444;
    --success: #22c55e;
    --border: #334155;
    
    --radius: 12px;
    --font-family: 'Inter', system-ui, sans-serif;
}

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

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

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

/* Login */
#login-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.login-card {
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--accent), #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

input, select {
    width: 100%;
    padding: 0.75rem;
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: #0f172a;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-text {
    background: transparent;
    color: var(--text-secondary);
    width: auto;
}

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

.message {
    min-height: 20px;
    color: var(--danger);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.dashboard-header .logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.controls-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.control-group {
    flex: 1;
    max-width: 200px;
}

.summary-card {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    text-align: center;
}

.summary-card h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--success);
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
}

.payments-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.payment-item {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s;
}

.payment-item:hover {
    transform: translateX(4px);
    border-color: var(--text-secondary);
}

.payment-info h4 {
    margin-bottom: 0.25rem;
}

.payment-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.payment-status {
    font-weight: 600;
}

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

.status-pending {
    color: var(--danger);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row > * {
    flex: 1;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
    margin-top: 1.8rem;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

.input-wrapper {
    position: relative;
}

.currency-symbol {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.input-wrapper input {
    padding-left: 25px;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.2s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    background: var(--bg-card);
    transform: scale(1);
    transition: transform 0.2s;
}

.modal.hidden .modal-content {
    transform: scale(0.95);
}