:root {
    --primary: #06a44b;
    --primary-dark: #058c3f;
    --primary-light: #07c559;
    --black: #000000;
    --dark: #1a1a1a;
    --gray: #666666;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --success: #06a44b;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* Header Moderno */
.app-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center;
    max-width: 100%;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.6rem;
}

.user-menu {
    position: relative;
}

.user-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    cursor: pointer;
    transition: var(--transition);
}

.user-avatar:hover {
    border-color: var(--white);
    transform: scale(1.05);
}

/* Navegación Inferior Moderna */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-around;
    padding: 0.8rem 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--gray);
    font-size: 0.75rem;
    padding: 0.5rem;
    flex: 1;
    text-align: center;
    transition: var(--transition);
    border-radius: var(--radius);
    margin: 0 0.2rem;
}

.nav-item.active {
    color: var(--primary);
    background: rgba(6, 164, 75, 0.1);
}

.nav-item:hover {
    color: var(--primary);
    transform: translateY(-2px);
}

.nav-icon {
    font-size: 1.3rem;
    margin-bottom: 0.3rem;
}

/* Contenido Principal */
.main-content {
    margin: 70px 0 80px 0;
    padding: 1rem;
    min-height: calc(100vh - 150px);
}

/* Cards Modernas */
.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--black);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Botones Modernos */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    text-decoration: none;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(6, 164, 75, 0.3);
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--black);
    border: 1px solid #ddd;
}

.btn-secondary:hover {
    background: #e9ecef;
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Forms Modernos */
.form-group {
    margin-bottom: 1.2rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--black);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--white);
    color: var(--black);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(6, 164, 75, 0.1);
}

/* Posts Modernos */
.post-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.post-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.2rem;
}

.post-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 1rem;
    border: 3px solid var(--primary);
    object-fit: cover;
}

.post-user-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    font-weight: 600;
}

.post-time {
    font-size: 0.8rem;
    color: var(--gray);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.post-content {
    margin-bottom: 1.2rem;
    line-height: 1.6;
    font-size: 1rem;
}

.post-image {
    width: 100%;
    border-radius: var(--radius);
    margin-bottom: 1.2rem;
    max-height: 400px;
    object-fit: cover;
}

.post-actions {
    display: flex;
    justify-content: space-around;
    border-top: 1px solid rgba(0,0,0,0.1);
    padding-top: 1rem;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: var(--transition);
    cursor: pointer;
}

.action-btn:hover {
    background: rgba(6, 164, 75, 0.1);
    color: var(--primary);
}

.action-btn.active {
    color: var(--primary);
    background: rgba(6, 164, 75, 0.1);
}

/* Stats Grid Moderno */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem 1rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(6, 164, 75, 0.3);
}

.stat-icon {
    font-size: 2rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.9;
}

/* Modal Moderno */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--white);
    margin: 2rem;
    border-radius: var(--radius);
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border-radius: var(--radius) var(--radius) 0 0;
}

.modal-header h3 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.close {
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.8;
    transition: var(--transition);
}

.close:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* Alertas Modernas */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.alert-success {
    background: rgba(6, 164, 75, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: var(--warning);
    color: var(--warning);
}

/* Utilidades */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.bg-primary { background: var(--primary); }
.text-muted { color: var(--gray); }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        padding: 0.8rem;
        margin: 15px 0 75px 0;
    }
    
    .card {
        padding: 1.2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }
    
    .modal-content {
        margin: 1rem;
    }
    
    .btn {
        padding: 0.7rem 1.2rem;
    }
}

/* Loading Spinner */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(6, 164, 75, 0.2);
    border-left: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}