/* Components */

/* Headers */
.app-header {
    height: var(--header-height);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 50;
    position: sticky;
    top: 0;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background var(--transition-fast);
}

.header-btn:active {
    background: rgba(255, 255, 255, 0.1);
}

/* Bottom Navigation */
.bottom-nav {
    position: relative; /* Part of flex flow, not floating over content */
    flex-shrink: 0;     /* Never compress — always fully visible */
    width: 100%;
    height: var(--nav-height);
    background: var(--bg-glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 50;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.75rem;
    gap: 4px;
    padding: var(--spacing-sm);
    transition: color var(--transition-fast);
    cursor: pointer;
}

.nav-item i {
    font-size: 1.25rem;
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.nav-item:hover, .nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: translateY(-2px);
    filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.5));
}

.nav-item.center-action {
    position: relative;
    top: -15px;
}

.nav-item.center-action .action-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-neon);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-family: var(--font-body);
    font-size: 1rem;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast);
    border: none;
    gap: 8px;
    width: 100%;
}

.btn:active {
    transform: scale(0.98);
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 229, 255, 0.2);
}

.btn-primary:active {
    box-shadow: 0 2px 8px rgba(0, 229, 255, 0.2);
}

.btn-accent {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 42, 95, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Inputs & Form Groups */
.form-group {
    margin-bottom: var(--spacing-md);
    width: 100%;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
}

.form-control::placeholder {
    color: var(--text-tertiary);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

/* Cards (Glassmorphism look) */
.card {
    background: var(--gradient-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-normal);
}

.card:active {
    transform: scale(0.98);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title i {
    color: var(--primary-color);
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.category-card {
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-card.selected {
    border-color: var(--primary-color);
    background: rgba(0, 229, 255, 0.05);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.1);
}

.category-card i {
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.category-card.selected i {
    color: var(--primary-color);
}

.category-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.category-type {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Profile Picture & Avatars */
.avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 2px solid var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    object-fit: cover;
}

.avatar-lg {
    width: 100px;
    height: 100px;
    border-width: 3px;
    margin: 0 auto;
}

.avatar i {
    font-size: 2rem;
    color: var(--text-tertiary);
}

/* List Items (Rankings, Challenges) */
.list-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.list-item:last-child {
    border-bottom: none;
}

.item-index {
    width: 30px;
    font-weight: 700;
    color: var(--text-secondary);
}

.item-index.top-1 { color: #facc15; } /* Gold */
.item-index.top-2 { color: #94a3b8; } /* Silver */
.item-index.top-3 { color: #b45309; } /* Bronze */

.item-body {
    flex: 1;
    margin-left: var(--spacing-sm);
}

.item-name {
    font-weight: 600;
    font-size: 1rem;
}

.item-meta {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    display: flex;
    gap: 8px;
}

.item-action {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Tags/Badges */
.badge {
    padding: 2px 8px;
    border-radius: var(--radius-rounded);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-info { background: rgba(59, 130, 246, 0.1); color: var(--info); }