:root {
    --primary-color: #2C3E50;
    --accent-color: #E74C3C;
    --success-color: #27AE60;
    --muted-color: #7F8C8D;
    --bg-color: #F4F6F7;
    --card-color: #FFFFFF;
    --text-color: #333333;
    --border-color: #D6DBDF;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
}

a {
    color: inherit;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

header h1 {
    margin: 0;
    letter-spacing: -0.04em;
}

nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover,
nav a:focus {
    color: var(--accent-color);
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero,
.panel-header {
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero h2,
.panel-header h2,
.form-panel h2 {
    margin: 0 0 0.5rem;
    color: var(--primary-color);
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: -0.05em;
}

.eyebrow {
    margin: 0 0 0.5rem;
    color: var(--accent-color);
    text-transform: uppercase;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.grid-galeria {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tarjeta-obra {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.tarjeta-obra:hover {
    transform: translateY(-5px);
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.12);
}

.tarjeta-obra img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.card-body {
    padding: 1rem 1rem 1.25rem;
}

.tarjeta-obra h3 {
    margin: 0 0 0.35rem;
    color: var(--primary-color);
}

.categoria {
    color: var(--muted-color);
    font-size: 0.9em;
    margin-bottom: 15px;
}

.btn-primary,
.btn-secundario {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1rem;
    text-decoration: none;
    border-radius: 6px;
    border: 0;
    cursor: pointer;
    font-weight: 800;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

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

.btn-link {
    color: var(--primary-color);
    font-weight: 800;
    text-decoration: none;
}

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

.filter-bar {
    display: flex;
    align-items: end;
    gap: 0.75rem;
    flex-wrap: wrap;
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
}

.filter-bar label,
.form-card label {
    font-weight: 800;
    color: var(--primary-color);
}

input,
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font: inherit;
    background: white;
}

.filter-bar select {
    min-width: 240px;
}

.form-page,
.auth-container {
    max-width: 760px;
}

.form-panel,
.auth-card {
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.form-card {
    display: grid;
    gap: 0.9rem;
    margin-top: 1.25rem;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-row input {
    width: auto;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.alert {
    padding: 0.9rem 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-weight: 700;
}

.alert-success {
    background: #D4EFDF;
    color: #145A32;
    border: 1px solid #A9DFBF;
}

.alert-error {
    background: #FADBD8;
    color: #922B21;
    border: 1px solid #F5B7B1;
}

.alert-info {
    background: #EBF5FB;
    color: #1B4F72;
    border: 1px solid #AED6F1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.card-stat {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.card-stat h3 {
    margin: 0 0 0.5rem;
    color: var(--muted-color);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.card-stat p {
    margin: 0;
    color: var(--primary-color);
    font-size: 2.2rem;
    font-weight: 900;
}

.admin-section {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.table-wrapper {
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    vertical-align: middle;
}

.admin-table th {
    color: var(--primary-color);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.thumb-admin {
    width: 84px;
    height: 58px;
    object-fit: cover;
    border-radius: 6px;
    display: block;
}

.badge {
    display: inline-block;
    padding: 0.35rem 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
}

.badge-success {
    background: #D4EFDF;
    color: #145A32;
}

.badge-muted {
    background: #EAECF0;
    color: #566573;
}

.actions-cell {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.actions-cell a {
    color: var(--primary-color);
    font-weight: 800;
    text-decoration: none;
}

.actions-cell a:hover {
    color: var(--accent-color);
}

.message-card,
.empty-state {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.message-read {
    opacity: 0.72;
}

.message-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: start;
}

.message-header p {
    margin: 0.2rem 0 0;
    color: var(--muted-color);
    font-size: 0.9rem;
}

.obra-detalle {
    background: white;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.obra-detalle > img {
    width: 100%;
    max-height: 560px;
    object-fit: cover;
    display: block;
}

.obra-info {
    padding: 2rem;
}

.obra-info h2 {
    margin: 0 0 0.5rem;
    color: var(--primary-color);
    font-size: clamp(2rem, 4vw, 3rem);
}

.artist-name {
    color: var(--muted-color);
    font-weight: 800;
}

.preview-image {
    display: block;
    width: 180px;
    max-width: 100%;
    height: 120px;
    object-fit: cover;
    margin-top: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.full-width {
    grid-column: 1 / -1;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: var(--primary-color);
    color: white;
    margin-top: 40px;
}

#lightbox {
    cursor: pointer;
}

@media (max-width: 700px) {
    header {
        align-items: flex-start;
    }

    nav {
        width: 100%;
    }

    main {
        padding: 1rem;
    }

    .hero,
    .panel-header,
    .form-panel,
    .auth-card {
        padding: 1.25rem;
    }

    .filter-bar {
        align-items: stretch;
    }

    .filter-bar select,
    .filter-bar button,
    .filter-bar a {
        width: 100%;
    }
}