/* ==========================================================
   layout.css — Header, breadcrumb, portfolio header, tabs,
                main content, footer
   ========================================================== */

/* Header */
.header {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(26, 26, 46, 0.95) 100%);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-md) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    flex-shrink: 0;
}

.logo-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
    color: var(--accent-blue-light);
    background: rgba(99, 102, 241, 0.15);
}

/* Breadcrumb */
.breadcrumb-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
}

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.breadcrumb-link:hover {
    color: var(--accent-blue-light);
}

.breadcrumb-separator {
    color: var(--text-muted);
}

.breadcrumb-separator svg {
    width: 14px;
    height: 14px;
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
}

.back-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.back-link:hover {
    color: var(--accent-blue-light);
}

.back-link svg {
    width: 16px;
    height: 16px;
}

/* Portfolio Header */
.portfolio-header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
    border-bottom: 1px solid var(--border-color);
}

.portfolio-header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.portfolio-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.portfolio-avatar {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.portfolio-avatar svg {
    width: 32px;
    height: 32px;
    color: white;
}

.portfolio-author {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.portfolio-title-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.portfolio-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.portfolio-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.portfolio-actions .btn-icon {
    width: 32px;
    height: 32px;
    padding: 6px;
    border-radius: 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-actions .btn-icon:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.portfolio-actions .btn-icon.delete:hover {
    background: var(--danger);
    border-color: var(--danger);
}

.portfolio-actions .btn-icon svg {
    width: 16px;
    height: 16px;
}

.portfolio-stats-summary {
    display: flex;
    gap: var(--spacing-2xl);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.75rem;
    flex-direction: column;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-value.positive {
    color: var(--accent-green);
}

.stat-value.negative {
    color: var(--accent-red);
}

/* Tabs */
.tabs-container {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: var(--header-height);
    z-index: 50;
}

.tabs {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    gap: var(--spacing-xs);
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
}

.tab:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.05);
}

.tab.active {
    color: var(--accent-blue-light);
    border-bottom-color: var(--accent-blue);
}

/* Main Content */
.main-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-2xl);
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-right {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--accent-blue-light);
}

/* Responsive */
@media (max-width: 768px) {
    .portfolio-header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .portfolio-stats-summary {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }

    .stat-item {
        text-align: left;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}