/* styles.css */

/* 1. Basic CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 2. Theme - Dark with Blue Gradients */
:root {
    --bg-primary: #0f172a; /* Slate-900 like */
    --bg-secondary: #1e3a8a; /* Darker blue */
    --bg-gradient-start: #1e3a8a;
    --bg-gradient-mid: #3b82f6;
    --bg-gradient-end: #60a5fa;
    --text-color: #f8fafc; /* White */
    --text-muted: #94a3b8; /* Slate-400 */
    --border-color: rgba(255, 255, 255, 0.2);
    --card-bg: rgba(255, 255, 255, 0.05); /* White with opacity */
    --card-bg-blur: 8px;
    --button-primary: #3b82f6;
    --button-primary-hover: #2563eb;
    --button-secondary: #ef4444; /* Red for destructive actions */
    --button-secondary-hover: #dc2626;
    --transition-speed: 0.3s;
}

body {
    background: linear-gradient(to bottom right, var(--bg-gradient-start), var(--bg-gradient-mid), var(--bg-gradient-end));
    background-size: cover;
    background-attachment: fixed;
    color: var(--text-color);
    min-height: 100vh;
}

/* 3. Glassmorphism Cards */
.card {
    background-color: var(--card-bg);
    backdrop-filter: blur(var(--card-bg-blur));
    border: 1px solid var(--border-color);
    border-radius: 16px; /* Bordes más redondeados */
    padding: 2rem; /* Más espacio interno */
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37); /* Sombra más pronunciada y suave */
    transition: transform var(--transition-speed) ease-in-out, box-shadow var(--transition-speed) ease-in-out; /* Añadir transición para la sombra */
}

.card:hover {
    transform: translateY(-8px); /* Elevación más notoria */
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.45); /* Sombra más profunda en hover */
}

/* 4. Buttons with Hover Effects */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 12px; /* Bordes más redondeados */
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition-speed) ease-in-out, border-color var(--transition-speed) ease-in-out, transform var(--transition-speed) ease-in-out, box-shadow var(--transition-speed) ease-in-out; /* Añadir transición para la sombra */
    -webkit-appearance: none; /* For consistency across browsers */
    -moz-appearance: none;
    appearance: none;
    font-size: 1rem;
    line-height: 1.5;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); /* Sombra sutil para botones */
}

.btn-primary {
    background-color: var(--button-primary);
    color: var(--text-color);
    border: 1px solid var(--button-primary);
}

.btn-primary:hover {
    background-color: var(--button-primary-hover);
    border-color: var(--button-primary-hover);
    transform: translateY(-3px); /* Un poco más de elevación */
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25); /* Sombra más pronunciada en hover */
}

.btn-secondary {
    background-color: var(--button-secondary);
    color: var(--text-color);
    border: 1px solid var(--button-secondary);
}

.btn-secondary:hover {
    background-color: var(--button-secondary-hover);
    border-color: var(--button-secondary-hover);
    transform: translateY(-3px); /* Un poco más de elevación */
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25); /* Sombra más pronunciada en hover */
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 5. Responsive Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    text-align: left;
}

.table th, .table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

.table th {
    color: var(--text-muted);
    font-weight: 600;
    white-space: nowrap;
}

.table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

/* 6. Smooth Transitions (already included in .card and .btn) */
/* This is handled by defining var(--transition-speed) and applying it */

/* 7. Mobile-first Responsive Design */
/* Basic responsive adjustments for typography and padding */
body {
    padding: 1rem;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem; /* Más espacio */
    font-weight: 700;
}

h2 {
    font-size: 1.7rem;
    margin-bottom: 1.25rem; /* Más espacio */
}

h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem; /* Más espacio */
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    body {
        padding: 2rem;
    }

    h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2.2rem;
    }

    h3 {
        font-size: 1.7rem;
    }

    .card {
        padding: 2rem;
    }
}

/* Large devices (desktops, 1024px and up) */
@media (min-width: 1024px) {
    body {
        padding: 3rem;
    }

    .container { /* Example for a centered content area */
        max-width: 1200px;
        margin: 0 auto;
    }
}

/* Utility classes for layout - to be used with HTML */
.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.grid-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.grid-cols-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

@media (max-width: 767px) {
    .grid-cols-2, .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr; /* Stack columns on small screens */
    }
}