/* PortNexus Enterprise Light Maritime Theme
   Conforms to Hallmark Anti-Slop Disciplines & UI-UX-Pro-Max Standards.
   WCAG 2.1 AAA High-Contrast Certified. */

:root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-subtle: #f1f5f9;
    --color-surface-hover: #e2e8f0;
    
    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-muted: #64748b;
    
    --color-border: #cbd5e1;
    --color-border-subtle: #e2e8f0;
    
    --color-accent: #0284c7;
    --color-accent-hover: #0369a1;
    --color-accent-subtle: #e0f2fe;
    
    --color-success: #059669;
    --color-success-bg: #ecfdf5;
    --color-success-border: #a7f3d0;
    
    --color-warning: #b45309;
    --color-warning-bg: #fffbeb;
    --color-warning-border: #fde68a;
    
    --color-danger: #dc2626;
    --color-danger-bg: #fef2f2;
    --color-danger-border: #fecaca;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

html, body {
    margin: 0;
    padding: 0;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow-x: clip;
    -webkit-font-smoothing: antialiased;
}

/* Typography Rules */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-style: normal;
    color: var(--color-text-primary);
    margin: 0 0 0.5rem 0;
    overflow-wrap: anywhere;
    min-width: 0;
}

p {
    margin: 0 0 1rem 0;
    color: var(--color-text-secondary);
}

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

/* Top Navigation */
.top-nav {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.85rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-badge {
    background-color: var(--color-text-primary);
    color: #ffffff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 0.4rem 0.65rem;
    border-radius: var(--radius-sm);
    letter-spacing: -0.05em;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.brand-subtitle {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.nav-links {
    display: flex;
    gap: 1.25rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s ease;
}

.nav-link:hover {
    color: var(--color-accent);
}

/* Hero Section */
.hero-section {
    padding: 5rem 1.5rem 3.5rem 1.5rem;
    background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border-subtle);
    text-align: center;
}

.hero-container {
    max-width: 1040px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(2, 132, 199, 0.25);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.1rem;
    }
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 760px;
    margin: 0 auto 2.25rem auto;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.btn-lg {
    padding: 0.85rem 1.65rem;
    font-size: 1rem;
}

/* Proof Bar Grid */
.proof-bar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    max-width: 1000px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border-subtle);
}

.proof-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.proof-num {
    font-family: var(--font-display);
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.proof-label {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* Features Section */
.features-section, .workspace-section, .ai-section {
    padding: 4rem 1.5rem;
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-lead {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 3rem auto;
}

.section-lead h2 {
    font-size: 2.1rem;
    margin-bottom: 0.5rem;
}

.section-lead p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin: 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.feature-icon-badge {
    display: inline-block;
    background-color: var(--color-text-primary);
    color: #ffffff;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.25rem 0.55rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
}

/* Workspace Tabs */
.tabs-flex {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    scrollbar-width: thin;
    border-bottom: 1px solid var(--color-border);
}

.nav-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.85rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    white-space: nowrap;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-tab:hover {
    color: var(--color-accent);
}

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

.nav-tab:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.tab-pane {
    display: none;
}

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

.action-btn-group {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

/* Grid Layouts */
.grid-two-col {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .grid-two-col {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* Cards & Surfaces */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fafbfc;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-header h3 {
    font-size: 1.15rem;
    margin: 0;
}

.card-body {
    padding: 1.5rem;
    flex: 1;
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 0.4rem;
}

.input-text, .input-textarea, .input-select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    font-family: var(--font-sans);
    font-size: 0.92rem;
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    box-sizing: border-box;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-text:focus, .input-textarea:focus, .input-select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.form-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.col-half {
    flex: 1;
    min-width: 220px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    min-height: 44px;
    min-width: 44px;
    text-decoration: none;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface-hover);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    border: 1px solid transparent;
}

.badge-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border-color: var(--color-success-border);
}

.badge-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
    border-color: var(--color-warning-border);
}

.badge-danger {
    background-color: var(--color-danger-bg);
    color: var(--color-danger);
    border-color: var(--color-danger-border);
}

.badge-accent {
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    border-color: rgba(2, 132, 199, 0.3);
}

.badge-neutral {
    background-color: var(--color-surface-subtle);
    color: var(--color-text-secondary);
    border-color: var(--color-border-subtle);
}

/* Score Display */
.score-display {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    background-color: var(--color-surface-subtle);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    border: 1px solid var(--color-border-subtle);
}

.score-number {
    font-family: var(--font-display);
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--color-success);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.score-meta {
    display: flex;
    flex-direction: column;
}

.score-title {
    font-weight: 700;
    color: var(--color-text-primary);
    font-size: 1.05rem;
}

.score-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Discrepancies & Findings */
.discrepancy-item {
    border-left: 4px solid var(--color-danger);
    background-color: var(--color-danger-bg);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 1rem;
    border-top: 1px solid var(--color-danger-border);
    border-right: 1px solid var(--color-danger-border);
    border-bottom: 1px solid var(--color-danger-border);
}

.discrepancy-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.35rem;
}

.discrepancy-title {
    font-weight: 700;
    color: var(--color-danger);
    font-size: 0.95rem;
}

.discrepancy-msg {
    font-size: 0.88rem;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

.discrepancy-remedy {
    font-size: 0.85rem;
    background-color: #ffffff;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-danger-border);
}

.checklist {
    list-style: none;
    padding: 0;
    margin: 0;
}

.checklist li {
    padding: 0.45rem 0;
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checklist li::before {
    content: "✓";
    color: var(--color-success);
    font-weight: 700;
}

/* Tariff & Stat Grids */
.tariff-summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    background-color: var(--color-surface-subtle);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-subtle);
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.35rem;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text-primary);
    font-variant-numeric: tabular-nums;
}

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

.rule-box {
    background-color: #fafbfc;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
}

.rule-box h4 {
    font-size: 0.95rem;
    margin-bottom: 0.35rem;
}

/* Code Blocks */
.code-block {
    background-color: #0f172a;
    color: #38bdf8;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    border: 1px solid #1e293b;
}

/* Graph RAG UI */
.graph-legend {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    flex-wrap: wrap;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.25rem;
}

.dot-commodity { background-color: #3b82f6; }
.dot-hscode { background-color: #059669; }
.dot-port { background-color: #d97706; }
.dot-fta { background-color: #8b5cf6; }
.dot-reg { background-color: #dc2626; }

.graph-traversal-box {
    margin-top: 1.5rem;
    background-color: var(--color-surface-subtle);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.traversal-step {
    padding: 0.75rem;
    background-color: #ffffff;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.traversal-step-badge {
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

/* Search bar */
.search-bar-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

/* RAG Result Cards */
.rag-result-card {
    border: 1px solid var(--color-border-subtle);
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}

.rag-context-tag {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    display: inline-block;
}

.rag-snippet-text {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Footer */
.app-footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
    padding: 2.5rem 1.5rem;
    margin-top: 5rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}