:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent-primary: #38bdf8;
    --accent-secondary: #818cf8;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --danger: #ef4444;
    --success: #22c55e;
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(129, 140, 248, 0.15) 0px, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

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

header {
    text-align: center;
    margin-bottom: 4rem;
    padding-top: 2rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

#links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.link-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: 2rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    box-shadow: var(--glass-shadow);
}

.link-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 40px rgba(56, 189, 248, 0.2);
}

.link-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    color: white;
}

.link-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: center;
}

.link-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.5;
}

.admin-controls {
    display: none;
    position: absolute;
    top: 1rem;
    right: 1rem;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: translateY(-5px);
}

body.admin-mode .link-card:hover .admin-controls {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-icon.delete:hover {
    background: var(--danger);
}

/* FAB */
.fab {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(56, 189, 248, 0.4);
    transition: transform 0.3s;
    border: none;
    z-index: 100;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: #1e293b;
    width: 90%;
    max-width: 500px;
    padding: 2.5rem;
    border-radius: 2rem;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.modal-header {
    margin-bottom: 2rem;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 0.8rem;
    color: white;
    outline: none;
    transition: border-color 0.2s;
}

input:focus {
    border-color: var(--accent-primary);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 0.8rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.icon-selector-wrapper {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.icon-preview-box {
    width: 48px;
    height: 48px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.icon-search-container {
    margin-top: 1rem;
    background: rgba(15, 23, 42, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 1rem;
}

#icon-search {
    margin-bottom: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
}

.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 0.5rem;
    max-height: 150px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Scrollbar and icon buttons */
.icon-grid::-webkit-scrollbar {
    width: 6px;
}
.icon-grid::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}

.icon-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.icon-item:hover {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.icon-item.selected {
    background: var(--accent-primary);
    color: white;
}

/* --- Nuevos Estilos de Administración --- */

.header-top {
    display: flex;
    justify-content: flex-end;
    margin-bottom: -1rem;
}

.btn-admin-auth {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    border-radius: 1rem;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    box-shadow: var(--glass-shadow);
}

.btn-admin-auth:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
    transform: translateY(-2px);
}

body.admin-mode .btn-admin-auth {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

body.admin-mode .btn-admin-auth i {
    color: var(--success);
}

.admin-only {
    display: none !important;
}

body.admin-mode .admin-only {
    display: flex !important;
}

body.admin-mode .admin-only.btn {
    display: inline-block !important;
}

.login-error-msg {
    margin-top: 0.75rem;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 0.75rem;
    border-radius: 0.6rem;
    font-size: 0.85rem;
    text-align: center;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}