/* Kokonut-inspired Modern Design */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login Page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    text-align: center;
    margin-bottom: 30px;
}

.logo h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-wrapper input {
    padding-right: 50px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: 4px 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
}

.toggle-password:hover {
    transform: scale(1.1);
}

.toggle-password:active {
    transform: scale(0.95);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--text-secondary);
    color: white;
}

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

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

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

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

.btn-success:hover {
    background: #059669;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.875rem;
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    margin-bottom: -2px;
}

.auth-tab:hover {
    color: var(--primary-color);
}

.auth-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Auth Forms */
.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.error-message {
    background: #fee2e2;
    color: var(--danger-color);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.success-message {
    background: #d1fae5;
    color: var(--success-color);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
}

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

/* Dashboard */
.app-container {
    min-height: 100vh;
    background: var(--bg-color);
}

.header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.card-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* Date Selector */
.date-selector {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.date-controls {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.form-group-inline {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group-inline label {
    font-weight: 600;
}

.form-group-inline select {
    padding: 10px 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    cursor: pointer;
    min-width: 150px;
}

.form-group-inline select option {
    color: var(--text-primary);
}

/* Form Row for side-by-side fields */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

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

/* Summary Grid */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.summary-card {
    text-align: center;
    padding: 30px 20px;
    border-left: 4px solid;
}

.summary-card.total {
    border-left-color: var(--primary-color);
    background: linear-gradient(135deg, #667eea20, #764ba220);
}

.summary-card.spent {
    border-left-color: var(--danger-color);
    background: linear-gradient(135deg, #ef444420, #dc262620);
}

.summary-card.remaining {
    border-left-color: var(--warning-color);
    background: linear-gradient(135deg, #f59e0b20, #d9770620);
}

.summary-card.savings {
    border-left-color: var(--success-color);
    background: linear-gradient(135deg, #10b98120, #05966920);
}

.summary-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

.summary-card .amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.summary-card .grade {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 600;
    margin-top: 8px;
}

.grade-A {
    background: var(--success-color);
    color: white;
}

.grade-B {
    background: var(--primary-color);
    color: white;
}

.grade-C {
    background: var(--warning-color);
    color: white;
}

.grade-D, .grade-F {
    background: var(--danger-color);
    color: white;
}

/* Instructions Card */
.instructions-card {
    background: linear-gradient(135deg, #fbbf2420, #f59e0b20);
    border-left: 4px solid var(--warning-color);
}

.instructions-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.instructions-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Forms */
.form-container {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* Lists */
.list-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--bg-color);
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.list-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.list-item-content {
    flex: 1;
}

.list-item-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.list-item-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 20px;
}

.list-item-actions {
    display: flex;
    gap: 8px;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.125rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }

    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        white-space: nowrap;
        font-size: 0.875rem;
        padding: 10px 16px;
    }

    .list-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .list-item-amount {
        margin: 0;
    }

    .list-item-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .date-controls {
        flex-direction: column;
        width: 100%;
    }

    .form-group-inline {
        width: 100%;
    }

    .form-group-inline select {
        flex: 1;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 20px 12px;
    }

    .card {
        padding: 16px;
    }

    .login-card {
        padding: 30px 20px;
    }

    .summary-card .amount {
        font-size: 1.5rem;
    }
}