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

:root {
    /* Colors */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --wood-color: #92400e;
    --wood-light: #fef3c7;
    --eggs-color: #b45309;
    --eggs-light: #fef9c3;
    --success: #16a34a;
    --success-light: #dcfce7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;

    /* Responsive spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* Responsive typography */
    --text-xs: clamp(0.7rem, 2vw, 0.75rem);
    --text-sm: clamp(0.8rem, 2.2vw, 0.875rem);
    --text-base: clamp(0.875rem, 2.5vw, 1rem);
    --text-lg: clamp(1rem, 3vw, 1.125rem);
    --text-xl: clamp(1.125rem, 3.5vw, 1.25rem);
    --text-2xl: clamp(1.25rem, 4vw, 1.5rem);
    --text-3xl: clamp(1.5rem, 5vw, 2rem);
    --text-4xl: clamp(1.75rem, 6vw, 2.5rem);

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Touch target minimum */
    --touch-target: 44px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    line-height: 1.5;
    font-size: var(--text-base);
    -webkit-text-size-adjust: 100%;
    min-height: 100vh;
    min-height: 100dvh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-md);
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

header h1 {
    font-size: var(--text-4xl);
    color: var(--primary);
    letter-spacing: 2px;
}

.subtitle {
    color: var(--gray-500);
    font-size: var(--text-sm);
}

/* Navigation - Mobile First */
.main-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    background: white;
    padding: var(--space-sm);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nav-btn {
    flex: 1;
    padding: var(--space-md);
    min-height: var(--touch-target);
    border: none;
    background: transparent;
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.nav-btn:active {
    transform: scale(0.98);
}

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

.nav-btn[data-tab="wood"].active {
    background: var(--wood-color);
}

.nav-btn[data-tab="eggs"].active {
    background: var(--eggs-color);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Dashboard - Mobile First */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.summary-card {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.summary-card h3 {
    font-size: var(--text-xs);
    color: var(--gray-500);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.summary-card .amount {
    font-size: var(--text-3xl);
    font-weight: 700;
}

.summary-card.total .amount {
    color: var(--primary);
}

.summary-card.wood {
    border-left: 4px solid var(--wood-color);
}

.summary-card.wood .amount {
    color: var(--wood-color);
}

.summary-card.eggs {
    border-left: 4px solid var(--eggs-color);
}

.summary-card.eggs .amount {
    color: var(--eggs-color);
}

.breakdown {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    margin-top: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--gray-500);
}

/* Category Header - Mobile First */
.category-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.category-header.wood {
    border-left: 4px solid var(--wood-color);
}

.category-header.eggs {
    border-left: 4px solid var(--eggs-color);
}

.category-header h2 {
    font-size: var(--text-2xl);
}

.category-summary {
    font-size: var(--text-base);
    color: var(--gray-500);
}

.category-summary strong {
    color: var(--gray-900);
}

/* Forms - Mobile First */
.entry-form {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.entry-form h3 {
    margin-bottom: var(--space-md);
    color: var(--gray-700);
    font-size: var(--text-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-xs);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="date"] {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    min-height: var(--touch-target);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    transition: border-color 0.2s;
    -webkit-appearance: none;
    appearance: none;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Toggle Group - Mobile First */
.toggle-group {
    display: flex;
    gap: 0;
}

.toggle-group input[type="radio"] {
    display: none;
}

.toggle-btn {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    min-height: var(--touch-target);
    text-align: center;
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    cursor: pointer;
    font-size: var(--text-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-btn:first-of-type {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.toggle-btn:last-of-type {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    border-left: none;
}

.toggle-btn:active {
    transform: scale(0.98);
}

input[type="radio"]:checked + .toggle-btn {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

#wood-sale:checked + .toggle-btn,
#wood-expense:checked + .toggle-btn {
    background: var(--wood-color);
    border-color: var(--wood-color);
}

#eggs-sale:checked + .toggle-btn,
#eggs-expense:checked + .toggle-btn {
    background: var(--eggs-color);
    border-color: var(--eggs-color);
}

/* Buttons - Mobile First */
.btn-primary {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    min-height: var(--touch-target);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

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

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

#wood-form .btn-primary {
    background: var(--wood-color);
}

#wood-form .btn-primary:hover {
    background: #78350f;
}

#eggs-form .btn-primary {
    background: var(--eggs-color);
}

#eggs-form .btn-primary:hover {
    background: #92400e;
}

.btn-secondary {
    padding: var(--space-sm) var(--space-md);
    min-height: var(--touch-target);
    background: var(--gray-200);
    color: var(--gray-700);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--gray-300);
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn-danger {
    padding: var(--space-sm) var(--space-md);
    min-height: var(--touch-target);
    background: var(--danger);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: background 0.2s;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-danger:active {
    transform: scale(0.98);
}

/* Transactions Section - Mobile First */
.transactions-section {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.transactions-section h3,
.recent-transactions h3 {
    margin-bottom: var(--space-md);
    color: var(--gray-700);
    font-size: var(--text-lg);
}

.recent-transactions {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Filter Bar - Mobile First */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: var(--space-xs);
}

.filter-bar::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    padding: var(--space-sm) var(--space-md);
    min-height: 36px;
    border: 1px solid var(--gray-300);
    background: white;
    border-radius: 20px;
    font-size: var(--text-sm);
    color: var(--gray-500);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.filter-btn:hover {
    border-color: var(--gray-500);
    color: var(--gray-700);
}

.filter-btn:active {
    transform: scale(0.95);
}

.filter-btn.active {
    background: var(--gray-900);
    border-color: var(--gray-900);
    color: white;
}

/* Transactions List - Mobile First */
.transactions-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.empty-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--gray-500);
    font-size: var(--text-sm);
}

.transaction-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    transition: background 0.2s;
}

.transaction-item:hover {
    background: var(--gray-100);
}

.transaction-info {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.transaction-type {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 5px;
}

.transaction-type.sale {
    background: var(--success);
}

.transaction-type.expense {
    background: var(--danger);
}

.transaction-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.transaction-description {
    font-weight: 500;
    color: var(--gray-900);
    font-size: var(--text-base);
    word-break: break-word;
}

.transaction-meta {
    font-size: var(--text-xs);
    color: var(--gray-500);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
}

.transaction-category {
    display: inline-block;
    padding: 2px var(--space-sm);
    border-radius: 4px;
    font-size: var(--text-xs);
    text-transform: uppercase;
    font-weight: 600;
}

.transaction-category.wood {
    background: var(--wood-light);
    color: var(--wood-color);
}

.transaction-category.eggs {
    background: var(--eggs-light);
    color: var(--eggs-color);
}

.transaction-right {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding-top: var(--space-xs);
    border-top: 1px solid var(--gray-200);
}

.transaction-amount {
    font-weight: 600;
    font-size: var(--text-lg);
}

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

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

.delete-btn {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--space-sm);
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.delete-btn:hover {
    background: var(--danger-light);
    color: var(--danger);
}

.delete-btn:active {
    transform: scale(0.95);
}

/* Modal - Mobile First */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    align-items: flex-end;
    justify-content: center;
    z-index: 1000;
    padding: var(--space-md);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h3 {
    margin-bottom: var(--space-sm);
    font-size: var(--text-xl);
}

.modal-content p {
    color: var(--gray-500);
    margin-bottom: var(--space-lg);
    font-size: var(--text-sm);
}

.modal-actions {
    display: flex;
    flex-direction: column-reverse;
    gap: var(--space-sm);
}

.modal-actions button {
    width: 100%;
}

/* =============================================
   RESPONSIVE BREAKPOINTS - TABLET AND UP
   ============================================= */

/* Tablet (481px - 768px) */
@media (min-width: 481px) {
    :root {
        --space-md: 20px;
        --space-lg: 28px;
    }

    .container {
        padding: var(--space-lg);
    }

    .main-nav {
        flex-direction: row;
    }

    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-row {
        grid-template-columns: 1fr 1fr;
    }

    .category-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .transaction-item {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .transaction-right {
        width: auto;
        border-top: none;
        padding-top: 0;
        gap: var(--space-md);
    }

    .modal {
        align-items: center;
        padding: var(--space-lg);
    }

    .modal-content {
        border-radius: var(--radius-lg);
        max-width: 400px;
        animation: fadeIn 0.2s ease-out;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: scale(0.95);
        }
        to {
            opacity: 1;
            transform: scale(1);
        }
    }

    .modal-actions {
        flex-direction: row;
        justify-content: flex-end;
    }

    .modal-actions button {
        width: auto;
    }

    .entry-form {
        padding: var(--space-lg);
    }

    .transactions-section,
    .recent-transactions {
        padding: var(--space-lg);
    }
}

/* Desktop (769px and up) */
@media (min-width: 769px) {
    :root {
        --space-md: 24px;
        --space-lg: 32px;
    }

    .dashboard-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .summary-card {
        padding: var(--space-lg);
    }

    .transaction-info {
        gap: var(--space-md);
    }

    .transaction-type {
        width: 12px;
        height: 12px;
    }

    .filter-bar {
        flex-wrap: nowrap;
    }
}

/* Large Desktop (1024px and up) */
@media (min-width: 1024px) {
    .container {
        max-width: 1000px;
    }
}

/* =============================================
   ACCESSIBILITY & INTERACTION STATES
   ============================================= */

/* Focus visible styles for keyboard navigation */
.nav-btn:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-danger:focus-visible,
.filter-btn:focus-visible,
.delete-btn:focus-visible,
.toggle-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.form-group input:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .main-nav,
    .entry-form,
    .modal,
    .delete-btn,
    .btn-primary,
    .btn-secondary,
    .btn-danger,
    .filter-bar {
        display: none !important;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .summary-card,
    .transactions-section,
    .category-header {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}