/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --color-primary: #05386B;
    --color-secondary: #379683;
    --color-accent: #5CDB95;
    --color-light-accent: #8EE4AF;
    --color-background: #EDF5E1;
    
    /* Light Theme */
    --bg-primary: #EDF5E1;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #05386B;
    --text-secondary: #379683;
    --text-muted: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(5, 56, 107, 0.1);
    --shadow-hover: 0 4px 20px rgba(5, 56, 107, 0.15);
    
    /* 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-sm: 0.875rem;
    --font-size-base: 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: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-card: #3a3a3a;
    --text-primary: #EDF5E1;
    --text-secondary: #8EE4AF;
    --text-muted: #cccccc;
    --border-color: #555555;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 72px; /* espaço para a bottom-nav */
}

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

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    padding: calc(var(--spacing-xl) + var(--spacing-sm)) 0 var(--spacing-xl);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.header__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.header__title {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.header__title .icon {
    width: 28px;
    height: 28px;
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-top: var(--spacing-xs);
}

.header__logo {
    display: block;
    margin: 0 auto var(--spacing-sm);
    max-width: 220px;
    max-height: 80px;
    width: auto;
    height: auto;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
}

.theme-toggle {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.theme-toggle__icon {
    font-size: var(--font-size-xl);
}

.theme-toggle .icon {
    width: 20px;
    height: 20px;
}

/* Main Content */
.main {
    flex: 1;
    padding: calc(var(--spacing-xxl) + 180px) 0 var(--spacing-xxl);
}

/* Card Styles */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card__title .icon {
    width: 20px;
    height: 20px;
}

/* Input Styles */
.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group__label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group__input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.input-group__input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(92, 219, 149, 0.1);
}

.input-with-unit {
    display: flex;
    gap: var(--spacing-sm);
}

.input-with-unit .input-group__input {
    flex: 1;
}

.unit-select {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    cursor: pointer;
    min-width: 80px;
}

/* Transport Modes */
.transport-modes {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.transport-mode {
    flex: 1;
    min-width: 120px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.transport-mode:hover {
    border-color: var(--color-accent);
    transform: translateY(-1px);
}

.transport-mode--active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary);
}

/* Checkbox Styles */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent);
}

.checkbox-label {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    cursor: pointer;
}

/* Results Styles */
.results {
    display: grid;
    gap: var(--spacing-md);
}

.result-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--color-accent);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item__label {
    font-weight: 500;
    color: var(--text-secondary);
}

.result-item__value {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

/* Button Styles */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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

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

.btn--secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn--secondary:hover {
    border-color: var(--color-accent);
    transform: translateY(-1px);
}

.btn--danger {
    background: #e74c3c;
    color: white;
}

.btn--danger:hover {
    background: #c0392b;
    transform: translateY(-1px);
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.quick-actions .btn {
    flex: 1;
    min-width: 140px;
}

/* History Styles */
.history-list {
    margin-bottom: var(--spacing-lg);
}

.history-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.history-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.history-item__title {
    font-weight: 600;
    color: var(--text-primary);
}

.history-item__date {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.history-item__details {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.4;
}

.history-item__actions {
    margin-top: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-sm);
}

.history-item__actions .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-bottom: 60px;
}

.footer__text {
    font-size: var(--font-size-sm);
}

.footer__link {
    color: var(--color-light-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-accent);
}

/* Toast Notification */
.toast {
    position: fixed;
    top: calc(64px + var(--spacing-md));
    right: var(--spacing-xl);
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-hover);
    transform: translateY(-200%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: 1000;
}

.toast--show {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.toast__message {
    font-size: var(--font-size-base);
    font-weight: 500;
}

/* Icon base */
.icon {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 64px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0 env(safe-area-inset-right) max(env(safe-area-inset-bottom), 8px) env(safe-area-inset-left);
    z-index: 1000;
    margin-bottom: 80px;
}

.bottom-nav__item {
    background: transparent;
    border: none;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.bottom-nav__item .icon { width: 22px; height: 22px; }
.bottom-nav__label { font-size: 0.75rem; }
.bottom-nav__item--active { color: var(--color-primary); }
.bottom-nav__item--active .icon { color: var(--color-primary); }

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .header__title {
        font-size: var(--font-size-xxl);
    }
    
    .header__subtitle {
        font-size: var(--font-size-base);
    }
    
    .theme-toggle {
        position: absolute;
        right: var(--spacing-md);
        top: var(--spacing-sm);
        margin: 0;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .transport-modes {
        flex-direction: column;
    }
    
    .transport-mode {
        min-width: auto;
    }
    
    .quick-actions {
        flex-direction: column;
    }
    
    .quick-actions .btn {
        min-width: auto;
    }
    
    .input-with-unit {
        flex-direction: column;
    }
    
    .unit-select {
        min-width: auto;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .history-item__header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .history-item__actions {
        flex-wrap: wrap;
    }
    
    .toast {
        right: var(--spacing-md);
        left: var(--spacing-md);
        top: calc(56px + var(--spacing-md));
        transform: translateY(-220%);
    }
}

@media (min-width: 1024px) {
    .bottom-nav {
        max-width: 640px;
        margin: 0 auto;
        left: 50%;
        transform: translateX(-50%);
        border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
    }
}

@media (max-width: 480px) {
    .main {
        padding: calc(var(--spacing-lg) + 140px) 0 var(--spacing-lg);
    }
    
    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }
    
    .card__title {
        font-size: var(--font-size-lg);
    }

    .header__logo {
        max-width: 200px;
        max-height: 80px;
    }
}

/* Animation for smooth transitions */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.result-item,
.history-item {
    animation: fadeIn 0.3s ease;
}

/* Focus styles for accessibility */
.btn:focus,
.input-group__input:focus,
.unit-select:focus,
.transport-mode:focus,
.checkbox:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
    }
}

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