@import url('fonts.css');

/* CSS Variables for Brand Design System */
:root {
    --color-ink: #0F172A;        /* Slate 900 */
    --color-muted: #475569;      /* Slate 600 */
    --color-bg-main: #F8FAFC;    /* Slate 50 */
    --color-bg-card: #FFFFFF;    /* White */
    --color-accent: #4F46E5;     /* Indigo 600 */
    --color-accent-hover: #4338CA; /* Indigo 700 */
    --color-accent-light: #EEF2F6; /* Light indigo/gray for tags */
    --color-accent-on-dark: #A5B4FC; /* Indigo 300 for dark backgrounds */
    --color-success: #047857;    /* Emerald 700 */
    --color-success-bg: #D1FAE5; /* Emerald 100 */
    --color-error: #B91C1C;      /* Red 700 */
    --color-error-bg: #FEE2E2;   /* Red 100 */
    --color-border: #E2E8F0;     /* Slate 200 */
    
    --font-heading: 'Sora', 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-main);
    color: var(--color-ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.5rem;
    color: var(--color-ink);
}

h1 {
    font-size: 2.25rem;
}

h2 {
    font-size: 1.75rem;
}

h3 {
    font-size: 1.25rem;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Global Shell Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--color-ink);
    text-decoration: none;
}

.logo-badge {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: white;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 800;
    font-size: 1.1rem;
}

.logo-badge-img {
    width: 2.25rem;
    height: 2.25rem;
    display: block;
    object-fit: contain;
}

.nav-desktop {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--color-muted);
    font-size: 0.95rem;
    text-decoration: none;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-accent);
    text-decoration: none;
}

.nav-cta {
    background-color: var(--color-accent);
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
}

.nav-cta:hover {
    background-color: var(--color-accent-hover);
    color: white;
    text-decoration: none;
}

/* Mobile Nav Toggle & Menu */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-ink);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0.25rem;
}

.mobile-menu {
    display: none;
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow-md);
}

.mobile-menu a {
    font-weight: 500;
    color: var(--color-muted);
}

.mobile-menu a.active {
    color: var(--color-accent);
}

/* Main Content Area */
main {
    flex: 1;
}

/* Hero Section */
.hero {
    background-color: var(--color-bg-card);
    padding: 4rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    text-align: center;
}

.hero-inner {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-ink) 60%, var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.15rem;
    color: var(--color-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.stat-chips {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.stat-chip {
    background-color: var(--color-bg-main);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stat-chip .dot {
    width: 6px;
    height: 6px;
    background-color: var(--color-accent);
    border-radius: 50%;
}

/* Search container & components */
.search-wrapper {
    max-width: 650px;
    margin: -1.75rem auto 3rem;
    padding: 0 1.5rem;
    position: relative;
    z-index: 10;
}

.search-box-container {
    background-color: var(--color-bg-card);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-lg);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 0.75rem 1rem;
    font-size: 1.1rem;
    font-family: var(--font-body);
    width: 100%;
}

.search-btn {
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.search-filters {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    justify-content: center;
}

.filter-btn {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    color: var(--color-muted);
    padding: 0.35rem 1rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn.active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.search-results-panel {
    display: none;
    margin-top: 0.5rem;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    position: absolute;
    left: 1.5rem;
    right: 1.5rem;
    z-index: 20;
}

.search-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.search-result-item:hover {
    background-color: var(--color-bg-main);
}

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

.result-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-align: left;
}

.result-title-row {
    display: flex;
    align-items: center;
    gap: 0.50rem;
    flex-wrap: wrap;
}

.result-code {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-ink);
    font-size: 1rem;
}

.result-title {
    color: var(--color-muted);
    font-size: 0.95rem;
    font-weight: 500;
}

.result-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 700;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.result-badge.naics {
    background-color: #E0E7FF;
    color: var(--color-accent);
}

.result-badge.sic {
    background-color: #FEF3C7;
    color: #D97706;
}

.result-sector {
    font-size: 0.75rem;
    color: #64748B;
}

.search-state-msg {
    padding: 2rem;
    text-align: center;
    color: var(--color-muted);
    font-weight: 500;
}

/* Sections */
.section {
    max-width: 1200px;
    margin: 0 auto 4rem;
    padding: 0 1.5rem;
}

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

.section-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--color-muted);
    font-size: 1rem;
}

/* Visual Decode Visual Component */
.decode-container {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.decode-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.decode-heading-title {
    font-weight: 700;
    font-size: 1.15rem;
}

.decode-code-tag {
    background-color: var(--color-accent-light);
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-weight: 700;
    font-family: var(--font-heading);
}

.decode-tiles {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

.decode-tile {
    background-color: var(--color-bg-main);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1rem;
    text-align: center;
    transition: var(--transition);
}

.decode-tile:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.tile-level {
    font-size: 0.7rem;
    font-weight: 700;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.tile-digits {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.tile-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-ink);
    line-height: 1.3;
}

/* Validator Page & Layout */
.validator-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 2rem auto 4rem;
    padding: 0 1.5rem;
}

.validator-sidebar {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-self: start;
    box-shadow: var(--shadow-sm);
}

.validator-nav-btn {
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    text-align: left;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-muted);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.validator-nav-btn:hover {
    background-color: var(--color-bg-main);
    color: var(--color-ink);
}

.validator-nav-btn.active {
    background-color: var(--color-accent-light);
    border-color: var(--color-border);
    color: var(--color-accent);
}

.validator-nav-btn::after {
    content: "→";
    opacity: 0.5;
}

.validator-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
}

.validator-title {
    margin-bottom: 0.5rem;
}

.validator-desc {
    color: var(--color-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.validator-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 550px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-ink);
}

.validator-input-group {
    display: flex;
    gap: 0.5rem;
}

.validator-input {
    flex: 1;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: var(--font-body);
    outline: none;
    transition: var(--transition);
}

.validator-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.validator-submit-btn {
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.validator-result {
    margin-top: 1.5rem;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: none;
    font-size: 0.95rem;
}

.validator-result.valid {
    display: block;
    background-color: var(--color-success-bg);
    border: 1px solid #A7F3D0;
    color: var(--color-success);
}

.validator-result.invalid {
    display: block;
    background-color: var(--color-error-bg);
    border: 1px solid #FECACA;
    color: var(--color-error);
}

.result-status {
    font-weight: 700;
    font-family: var(--font-heading);
    margin-bottom: 0.25rem;
}

.result-details {
    font-size: 0.9rem;
}

.result-link {
    margin-top: 0.75rem;
    display: inline-block;
    font-weight: 600;
    text-decoration: underline;
}

/* Home Section Layout */
.home-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1.25rem;
    color: var(--color-accent);
}

.feature-card h3 {
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--color-muted);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
}

/* Footer Section */
footer {
    background-color: var(--color-ink);
    color: #94A3B8; /* Slate 400 */
    border-top: 1px solid #1E293B;
    padding: 4rem 1.5rem;
    font-size: 0.9rem;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    color: white;
    margin-bottom: 1rem;
}

.footer-logo-badge {
    background-color: var(--color-accent);
    color: white;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 800;
}

.footer-brand p {
    line-height: 1.5;
}

.footer-links-grid {
    display: flex;
    gap: 4rem;
}

.footer-link-col {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link-col h3 {
    color: white;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.footer-link-col a {
    color: #94A3B8;
}

.footer-link-col a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #1E293B;
    padding-top: 2rem;
    text-align: center;
}

.footer-disclaimer {
    max-width: 800px;
    margin: 0 auto 1.5rem;
    font-size: 0.8rem;
    line-height: 1.6;
}

.footer-copy {
    font-size: 0.8rem;
}

/* Accessibility Utilities */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: white;
    padding: 8px;
    z-index: 100;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* Media Queries (Responsive Design) */
@media (max-width: 991px) {
    .validator-grid {
        grid-template-columns: 1fr;
    }
    
    .home-features {
        grid-template-columns: 1fr;
    }
    
    .decode-tiles {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .nav-desktop {
        display: none;
    }
    
    .mobile-nav-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .footer-top {
        flex-direction: column;
        gap: 3rem;
    }
    
    .footer-links-grid {
        gap: 2rem;
        flex-wrap: wrap;
    }
}