:root {
    /* Paleta Bento-style / Soft Minimalist */
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-main: #2d3436;
    --text-muted: #636e72;
    --accent: #4e54c8;
    --accent-glow: rgba(78, 84, 200, 0.3);
    --success: #00b894;
    --shadow-soft: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    --radius-l: 24px;
    --radius-m: 16px;
    --font-main: 'Inter', sans-serif;
}

/* VARIABLES MODO OSCURO */
body.dark-theme {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-main: #f4f6f9;
    --text-muted: #a0a0a0;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* Reset y Base */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.app-header {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Barra de XP */
.xp-bar-container {
    width: 80px; height: 8px;
    background: rgba(0,0,0,0.1);
    border-radius: 10px; margin-top: 5px;
}
body.dark-theme .xp-bar-container { background: rgba(255,255,255,0.1); }

.xp-bar-fill {
    height: 100%; background: var(--accent);
    width: 0%; border-radius: 10px;
    transition: width 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Layout */
#app-container {
    flex: 1; overflow-y: auto;
    padding: 0 24px 120px 24px;
}

.view { display: none; }
.view.active { display: block; animation: slideUpFade 0.4s ease; }

@keyframes slideUpFade {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Tarjetas de Metas */
.goal-card {
    background: var(--card-bg);
    border-radius: var(--radius-l);
    padding: 20px; margin-bottom: 16px;
    box-shadow: var(--shadow-soft);
    display: flex; align-items: center; justify-content: space-between;
    transition: transform 0.2s;
}

.goal-card:active { transform: scale(0.98); }

.goal-card.completed {
    background-color: var(--bg-color);
    opacity: 0.7;
}

/* Navegación Inferior */
.bottom-nav {
    position: fixed; bottom: 0; left: 0; width: 100%;
    height: 80px; background: var(--card-bg);
    display: flex; justify-content: space-around; align-items: center;
    border-top: 1px solid rgba(0,0,0,0.05);
    backdrop-filter: blur(10px);
    z-index: 100;
}
body.dark-theme .bottom-nav { border-top: 1px solid rgba(255,255,255,0.05); }

.nav-item {
    background: none; border: none; font-size: 1.5rem;
    color: var(--text-muted); cursor: pointer; transition: 0.3s;
}

.nav-item.active {
    color: var(--accent);
    transform: translateY(-5px);
}

/* Botón flotante (+) */
.fab-button {
    position: fixed; bottom: 100px; right: 24px;
    width: 56px; height: 56px; border-radius: 18px;
    background: var(--text-main); color: var(--bg-color);
    border: none; font-size: 1.2rem; cursor: pointer;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    z-index: 101;
}

/* Modales */
.modal {
    display: none; position: fixed; top: 0; left: 0;
    width: 100%; height: 100%; background: rgba(0,0,0,0.5);
    z-index: 200; align-items: flex-end;
}

.modal-content {
    background: var(--card-bg);
    width: 100%; padding: 32px 24px;
    border-radius: 32px 32px 0 0;
    animation: slideUp 0.3s ease-out;
}

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

.modal input, .modal select {
    width: 100%; padding: 14px; margin: 8px 0;
    border-radius: 12px; border: 1px solid rgba(0,0,0,0.1);
    background: var(--bg-color); color: var(--text-main);
    font-size: 1rem;
}

/* Botones */
.btn-primary {
    background: var(--accent); color: white;
    border: none; padding: 16px; border-radius: 16px;
    width: 100%; font-weight: 600; margin-top: 10px;
}

.icon-btn {
    background: none; border: none; font-size: 1.2rem;
    color: var(--text-main); cursor: pointer;
}