/* CSS Variables for consistent theming */
:root {
    --primary-color: #8B4513;
    --secondary-color: #D2691E;
    --accent-color: #FF8C00;
    --highlight-color: #FFA500;
    --light-color: #FFD700;
    --white: #ffffff;
    --gray-50: #fef7ef;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;
    --font-size-xxxl: 2rem;
    
    /* Border radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-100);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}
.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-text {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.brand-logo {
    width: 72px;
    height: 72px;
    object-fit: contain;
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.2));
}

.brand-label {
    font-size: var(--font-size-sm);
    letter-spacing: 0.5px;
    font-weight: 700;
    color: var(--light-color);
    opacity: 0.95;
}

.logo {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin: 0;
}

.logo-subtitle {
    font-size: var(--font-size-md);
    font-weight: 400;
    color: var(--white);
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.desktop-nav {
    justify-content: flex-end;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid transparent;
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    min-width: 110px;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

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

.nav-label {
    font-size: var(--font-size-xs);
    letter-spacing: 0.2px;
}

/* Main content */
.main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* Loading indicator */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    color: var(--gray-600);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-300);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Messages */
.error-message,
.success-message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.btn-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: inherit;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Tab content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

/* Section header */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
    font-size: var(--font-size-xxxl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.section-header p {
    color: var(--gray-600);
    font-size: var(--font-size-lg);
}

/* Forms */
.medication-form {
    background: var(--white);
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xxl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg) var(--spacing-xl);
}

.form-group {
    margin-bottom: 0;
}

.medication-form .form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    transition: var(--transition-normal);
    background-color: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.1);
}

.form-group input:invalid,
.form-group select:invalid {
    border-color: var(--error-color);
}

.form-group input:valid,
.form-group select:valid {
    border-color: var(--success-color);
}

/* Times grid */
.times-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.time-input-group {
    display: flex;
    flex-direction: column;
}

.time-input-group label {
    font-size: var(--font-size-xs);
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    min-height: 44px; /* Accessibility: minimum touch target */
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

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

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-loading {
    display: none;
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loading {
    display: inline;
}

/* Form actions */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
    grid-column: 1 / -1;
}

/* Medications list */
.medications-list {
    background: var(--white);
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.medications-list h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-xl);
    text-align: center;
}

.medications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.medication-card {
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-normal);
    position: relative;
}

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

.medication-card.antibiotico {
    border-left: 4px solid var(--error-color);
}

.medication-card.antiinflamatorio {
    border-left: 4px solid var(--warning-color);
}

.medication-card.vitamina {
    border-left: 4px solid var(--success-color);
}

.medication-card.vermifugo {
    border-left: 4px solid var(--info-color);
}

.medication-card.outro {
    border-left: 4px solid var(--gray-500);
}

.medication-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.medication-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.medication-type {
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    font-weight: 600;
}

.medication-info {
    margin-bottom: var(--spacing-md);
}

.medication-info p {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.medication-info strong {
    color: var(--gray-800);
}

.medication-times {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.time-badge {
    background: var(--accent-color);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.medication-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn-edit,
.btn-delete {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.btn-edit:hover {
    background: #138496;
}

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

.btn-delete:hover {
    background: #c82333;
}

/* Date selector */
.date-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.date-selector input[type="date"] {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
}

/* Daily stats */
.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-normal);
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Daily agenda */
.daily-agenda {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.agenda-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

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

.agenda-item:hover {
    background: var(--gray-50);
}

.agenda-item.completed {
    background: rgba(40, 167, 69, 0.1);
}

.agenda-item.overdue {
    background: rgba(220, 53, 69, 0.1);
}

.agenda-checkbox {
    width: 24px;
    height: 24px;
    margin-right: var(--spacing-lg);
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
}

.agenda-checkbox input[type="checkbox"] {
    width: 100%;
    height: 100%;
    cursor: pointer;
    opacity: 0;
    position: absolute;
    z-index: 2;
}

.checkbox-custom {
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary-color);
    border-radius: var(--border-radius-sm);
    position: relative;
    transition: var(--transition-normal);
    background: var(--white);
}

.agenda-checkbox input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.agenda-checkbox input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--white);
    font-weight: bold;
    font-size: 14px;
}

.agenda-info {
    flex: 1;
}

.agenda-time {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.agenda-medication {
    font-size: var(--font-size-md);
    color: var(--gray-800);
    margin-bottom: var(--spacing-xs);
}

.agenda-pet {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.agenda-dosage {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    font-style: italic;
}

.agenda-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    margin-left: var(--spacing-md);
}

.agenda-status.pending {
    background: var(--warning-color);
    color: var(--gray-800);
}

.agenda-status.completed {
    background: var(--success-color);
    color: var(--white);
}

.agenda-status.overdue {
    background: var(--error-color);
    color: var(--white);
}

/* History filters */
.history-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.history-filters select,
.history-filters input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    min-width: 150px;
}

/* History stats */
.history-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
}

/* History list */
.history-list {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.history-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

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

.history-date {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin-right: var(--spacing-lg);
    min-width: 100px;
}

.history-info {
    flex: 1;
}

.history-medication {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-xs);
}

.history-pet {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.history-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.history-status.completed {
    background: var(--success-color);
    color: var(--white);
}

.history-status.missed {
    background: var(--error-color);
    color: var(--white);
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--gray-600);
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
}

.empty-state p {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-lg);
}

.empty-state .btn {
    margin-top: var(--spacing-md);
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: auto;
    margin-bottom: 150px; /* To avoid overlap with black bar */
}
.bottom-nav {
    position: fixed;
    bottom: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.08);
    padding: var(--spacing-sm) var(--spacing-md);
    display: none;
    justify-content: space-between;
    gap: var(--spacing-sm);
    z-index: 200;
    backdrop-filter: blur(12px);
    margin-bottom: 80px; /* To avoid overlap with black bar */
}

.bottom-nav .nav-btn {
    flex: 1;
    min-width: auto;
    border-radius: var(--border-radius-md);
    background: transparent;
    color: var(--primary-color);
}

.bottom-nav .nav-btn.active {
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.bottom-nav .nav-label {
    font-size: var(--font-size-xs);
}


.footer p {
    margin: 0;
    font-size: var(--font-size-sm);
}

.footer a {
    color: var(--light-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header .container {
        flex-direction: column;
        text-align: center;
    }

    .brand {
        flex-direction: row;
        justify-content: center;
        text-align: left;
    }
    
    .brand-text {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-sm);
        text-align: left;
    }
    
    .desktop-nav {
        display: none;
    }
    
    .bottom-nav {
        display: flex;
    }
    
    .medication-form {
        padding: var(--spacing-lg);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .medications-grid {
        grid-template-columns: 1fr;
    }
    
    .daily-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .history-filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .history-filters select,
    .history-filters input {
        width: 100%;
    }
    
    .agenda-item {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    
    .agenda-checkbox {
        margin-bottom: var(--spacing-md);
        margin-right: 0;
    }
    
    .agenda-status {
        margin-left: 0;
        margin-top: var(--spacing-sm);
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .history-date {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .section-header h2 {
        font-size: var(--font-size-xxl);
    }
    
    .daily-stats {
        grid-template-columns: 1fr;
    }
    
    .date-selector {
        flex-direction: column;
    }
    
    .times-grid {
        grid-template-columns: 1fr;
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .nav,
    .form-actions,
    .medication-actions,
    .btn {
        display: none !important;
    }
    
    .main {
        padding: 0;
    }
    
    .medication-form,
    .medications-list,
    .daily-agenda,
    .history-list {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
    
    .agenda-checkbox input[type="checkbox"] {
        opacity: 1;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #333333;
        --accent-color: #666666;
        --gray-300: #cccccc;
        --gray-600: #333333;
    }
}