:root {
    --bg-color: #f8fafc;
    --sidebar-bg: #1e293b;
    --text-main: #0f172a;
    --text-light: #f1f5f9;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --card-bg: #ffffff;
    --danger: #ef4444;
    --success: #10b981;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', sans-serif; }

body { background-color: var(--bg-color); color: var(--text-main); height: 100vh; overflow: hidden; }

.hidden { display: none !important; }

/* LOGIN SCREEN */
.login-container { height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--sidebar-bg), #0f172a); }
.login-box { background: var(--card-bg); padding: 3rem; border-radius: 16px; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2); width: 100%; max-width: 400px; text-align: center; }
.login-box h2 { margin-bottom: 2rem; color: var(--text-main); }
.login-box input { width: 100%; padding: 15px; margin-bottom: 1rem; border: 2px solid var(--border); border-radius: 8px; outline: none; transition: 0.3s; }
.login-box input:focus { border-color: var(--accent); }

/* DASHBOARD LAYOUT */
.dashboard-layout { display: flex; height: 100vh; }

/* SIDEBAR */
.sidebar { width: 260px; background-color: var(--sidebar-bg); color: var(--text-light); display: flex; flex-direction: column; }
.sidebar-header { padding: 2rem 1.5rem; border-bottom: 1px solid rgba(255,255,255,0.1); display: flex; justify-content: space-between; align-items: center; }
.sidebar-header h2 { font-size: 1.2rem; font-weight: 600; }
.logout-btn { background: none; border: none; color: var(--danger); cursor: pointer; font-size: 0.9rem; transition: 0.3s; }
.logout-btn:hover { color: #fca5a5; }

.sidebar-nav { padding: 1.5rem 0; display: flex; flex-direction: column; gap: 0.5rem; }
.nav-btn { background: none; border: none; color: #cbd5e1; padding: 12px 1.5rem; text-align: left; font-size: 1rem; cursor: pointer; transition: 0.3s; display: flex; align-items: center; gap: 10px; width: 100%; }
.nav-btn:hover, .nav-btn.active { background-color: rgba(255,255,255,0.05); color: white; border-left: 4px solid var(--accent); }

/* MAIN CONTENT */
.main-content { flex: 1; padding: 2rem 3rem; overflow-y: auto; background-color: var(--bg-color); }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.section-header h1 { font-size: 1.8rem; font-weight: 600; color: var(--sidebar-bg); }

/* BOTONES GLOBALES */
.primary-btn { width: 100%; padding: 12px; background: var(--accent); color: white; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; transition: 0.3s; }
.primary-btn:hover { background: var(--accent-hover); }
.secondary-btn { padding: 10px 20px; background: white; border: 1px solid var(--border); border-radius: 8px; font-weight: 500; cursor: pointer; transition: 0.3s; color: var(--text-main); }
.secondary-btn:hover { border-color: var(--accent); color: var(--accent); }
.delete-btn { background: #fee2e2; color: var(--danger); border: none; padding: 8px 12px; border-radius: 6px; cursor: pointer; transition: 0.3s; }
.delete-btn:hover { background: var(--danger); color: white; }

/* TABLA DE MENSAJES */
.table-container { background: white; border-radius: 12px; box-shadow: var(--shadow); overflow: hidden; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; }
.data-table th, .data-table td { padding: 15px; border-bottom: 1px solid var(--border); }
.data-table th { background-color: #f8fafc; font-weight: 600; color: var(--text-muted); text-transform: uppercase; font-size: 0.85rem; }
.data-table tbody tr:hover { background-color: #f1f5f9; }

/* FORMULARIO DE SUBIDA */
.upload-card { background: white; padding: 2rem; border-radius: 12px; box-shadow: var(--shadow); margin-bottom: 2rem; }
.upload-card h3 { margin-bottom: 1.5rem; color: var(--text-main); }
.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-group label { font-size: 0.9rem; font-weight: 500; color: var(--text-muted); }
.form-group select, .form-group input { padding: 12px; border: 1px solid var(--border); border-radius: 8px; outline: none; background: #f8fafc; }
#upload-btn { grid-column: 1 / -1; margin-top: 1rem; }

/* GALERÍA ADMIN */
.admin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 15px; margin-top: 1rem; }
.admin-media-card { position: relative; border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); height: 150px; background: #000; }
.admin-media-card img { width: 100%; height: 100%; object-fit: cover; opacity: 0.8; }
.admin-media-card .delete-btn { position: absolute; top: 10px; right: 10px; }

/* ESTADO DE SUBIDA */
.status-msg { margin-top: 1rem; padding: 10px; border-radius: 8px; text-align: center; font-weight: 500; }
.status-msg.success { background: #d1fae5; color: #065f46; }
.status-msg.error { background: #fee2e2; color: #991b1b; }
.status-msg.loading { background: #e0f2fe; color: #075985; }