:root {
    --primary: #2d3436;
    --accent: #00b894;
    --danger: #d63031;
    --warning: #fdcb6e;
    --info: #0984e3;
    --bg: #f5f6fa;
    --card-bg: rgba(255, 255, 255, 0.9);
    --text: #2d3436;
    --text-main: #2d3436;
    --text-light: #636e72;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --glass: blur(10px);
    --border: rgba(0,0,0,0.05);
    --input-bg: #f1f2f6;
    --nav-bg: #ffffff;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.8);
    --text: #f1f5f9;
    --text-main: #f1f5f9;
    --text-light: #94a3b8;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --border: rgba(255,255,255,0.1);
    --input-bg: #1e293b;
    --nav-bg: #1e293b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
    padding-bottom: 100px; /* Espacio para que la navbar no tape nada */
    width: 100%;
    flex: 1;
}

/* Glassmorphism Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: var(--glass);
    -webkit-backdrop-filter: var(--glass);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    padding: 15px 25px;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}

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

.btn-danger {
    background: var(--danger);
    color: white;
    box-shadow: 0 4px 15px rgba(214, 48, 49, 0.3);
}

/* Clock UI */
.clock-display {
    text-align: center;
    padding: 40px 0;
}

.time {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 5px;
}

.date {
    color: var(--text-light);
    font-size: 1rem;
}

/* Status Badges */
.badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-in { background: rgba(0, 184, 148, 0.15); color: var(--accent); }
.badge-out { background: rgba(214, 48, 49, 0.15); color: var(--danger); }

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 12px 15px;
    border-radius: 10px;
    border: 2px solid transparent;
    background: var(--input-bg);
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
}

/* Navigation */
.top-nav {
    background: var(--nav-bg);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.navbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    display: flex;
    justify-content: space-around;
    padding: 15px 0;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.05);
    z-index: 100;
    border-top: 1px solid var(--border);
}

.nav-item {
    text-decoration: none;
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    font-size: 0.75rem;
}

.nav-item.active {
    color: var(--accent);
}

/* Desktop Styles */
@media (min-width: 768px) {
    .container {
        max-width: 1000px;
    }
    .navbar {
        position: relative;
        box-shadow: none;
        padding: 20px;
        background: transparent;
    }
}


/* Tabs de Historial */
.tab-container {
    background: var(--input-bg);
    padding: 5px;
    border-radius: 12px;
    margin-bottom: 20px;
    gap: 5px;
    display: flex;
}

.tab-btn {
    flex: 1;
    border: none;
    background: none;
    padding: 10px 5px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-light);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.tab-btn.active {
    background: var(--bg-card);
    color: var(--accent);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.badge-pending { background: rgba(253, 203, 110, 0.2); color: #d35400; }
.badge-success { background: rgba(0, 184, 148, 0.2); color: #27ae60; }
.badge-danger { background: rgba(214, 48, 49, 0.2); color: #c0392b; }

/* Estilos de Impresión */
@media print {
    body { background: white !important; }
    .navbar, .btn, .nav-item, #loader, #modal { display: none !important; }
    .container { max-width: 100% !important; padding: 0 !important; margin: 0 !important; }
    .card { box-shadow: none !important; border: 1px solid #eee !important; backdrop-filter: none !important; break-inside: avoid; }
    h3 { margin-top: 0; }
    .badge { border: 1px solid #ccc; }
}