:root {
    /* Colores Tema Claro */
    --color-bg: #ffffff;
    --color-text: #1f2937;
    --color-primary: #10b981; /* Verde */
    --color-secondary: #3b82f6; /* Azul */
    --color-visited: #10b981;
    --color-pending: #e5e7eb; /* Gris claro */
    --color-border: #e5e7eb;
    --color-panel-bg: #f9fafb;
    --color-hover: #f3f4f6;
    
    /* Tipografía */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Efectos */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --transition-fast: 200ms ease;
}

[data-theme="dark"] {
    /* Colores Tema Oscuro */
    --color-bg: #111827;
    --color-text: #f9fafb;
    --color-panel-bg: #1f2937;
    --color-border: #374151;
    --color-pending: #374151;
    --color-hover: #4b5563;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    height: 100vh;
    overflow: hidden;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.app-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Cabecera */
.app-header {
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.logo {
    display: flex;
    align-items: center;
}

#toggle-panel-btn {
    margin-right: 12px;
    font-size: 1.25rem;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.slogan {
    font-size: 0.875rem;
    color: var(--color-text);
    opacity: 0.7;
    display: none;
}

@media (min-width: 768px) {
    .slogan { display: block; }
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

#theme-toggle {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background-color: var(--color-panel-bg);
}

#theme-toggle:hover {
    background-color: var(--color-hover);
}

/* Layout Principal */
.app-main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Paneles Laterales */
.panel-left, .panel-right {
    background-color: var(--color-panel-bg);
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow-y: auto;
}

.panel-left {
    width: 300px;
    border-right: 1px solid var(--color-border);
    transition: width 0.3s ease, padding 0.3s ease, border 0.3s ease;
    overflow-x: hidden;
}

.panel-left.collapsed {
    width: 0;
    padding-left: 0;
    padding-right: 0;
    border-right: none;
}

.panel-right {
    width: 320px;
    border-left: 1px solid var(--color-border);
}

/* Panel Izquierdo */
.search-box input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 0.875rem;
    margin-bottom: 16px;
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.visited-list {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 16px;
}

/* List Items */
.list-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 0.875rem;
}

.list-item .flag {
    margin-right: 8px;
    font-size: 1.1rem;
}

.list-item .name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.list-item button {
    background-color: var(--color-panel-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 6px;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.list-item button.remove-btn {
    color: #ef4444;
    font-weight: bold;
    padding: 4px 10px;
}

.list-item button:hover {
    background-color: var(--color-hover);
}

.empty-state {
    font-size: 0.875rem;
    color: var(--color-text);
    opacity: 0.6;
    text-align: center;
    padding: 20px 0;
}

.suggest-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--color-primary);
    color: white;
    border-radius: 6px;
    font-weight: 500;
}

.suggest-btn:hover {
    opacity: 0.9;
}

#suggest-continent {
    width: 100%;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 0.875rem;
    margin-bottom: 8px;
    font-family: inherit;
    cursor: pointer;
}

#suggest-continent:focus {
    outline: none;
    border-color: var(--color-primary);
}

.action-buttons {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.action-btn {
    flex: 1;
    padding: 10px;
    border-radius: 6px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    background-color: var(--color-primary);
    color: white;
    font-family: inherit;
    font-size: 0.875rem;
    transition: opacity 0.2s, background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.action-btn:hover {
    opacity: 0.9;
}

.action-btn.danger {
    background-color: #ef4444;
}

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

/* Área Central (Mapa) */
.map-area {
    flex: 1;
    position: relative;
    background-color: var(--color-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#map-container {
    width: 100%;
    height: 100%;
}

.legend {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    gap: 16px;
    background-color: var(--color-bg);
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
}

.color-box {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    margin-right: 8px;
}

.color-box.visited { background-color: var(--color-visited); }
.color-box.pending { background-color: var(--color-pending); }

.map-controls {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 10;
}

.map-controls button {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.map-controls button:hover {
    background-color: var(--color-hover);
}

/* Panel Derecho (Estadísticas) */
.stat-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.stat-card h3 {
    font-size: 0.875rem;
    margin-bottom: 8px;
    color: var(--color-text);
    opacity: 0.8;
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--color-pending);
    border-radius: 3px;
    margin-top: 8px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    transition: width 0.5s ease;
}

/* Pie de página */
.app-footer {
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text);
    opacity: 0.6;
    background-color: var(--color-bg);
}

/* Mapa (SVG) */
.country {
    transition: fill var(--transition-fast), stroke-width var(--transition-fast);
    outline: none;
}

.country:hover {
    cursor: pointer;
}

/* Tooltip D3 */
.tooltip {
    position: absolute;
    background-color: var(--color-bg);
    color: var(--color-text);
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    pointer-events: none;
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 100;
    opacity: 0;
}

/* Estadísticas de continentes */
.continent-stat {
    margin-bottom: 12px;
}

.continent-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    margin-bottom: 4px;
    color: var(--color-text);
}

.continent-numbers {
    opacity: 0.8;
}