/* ==========================================================================
   Strata LLC - Main Stylesheet
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    /* Colors - Slate palette */
    --color-slate-900: #0f172a;
    --color-slate-800: #1e293b;
    --color-slate-700: #334155;
    --color-slate-600: #475569;
    --color-slate-500: #64748b;
    --color-slate-400: #94a3b8;
    --color-slate-300: #cbd5e1;
    --color-slate-200: #e2e8f0;
    --color-slate-100: #f1f5f9;
    --color-slate-50: #f8fafc;
    --color-white: #ffffff;
    
    /* Accent colors */
    --color-accent: #3b82f6;
    --color-accent-dark: #2563eb;
    --color-accent-light: #60a5fa;
    --color-accent-lighter: #93c5fd;
    
    /* Typography */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-section: 5rem;
    --spacing-container: 2rem;
    --max-width: 1200px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-slate-700);
    line-height: 1.6;
    background: var(--color-white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-slate-100);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--spacing-container);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo Styles */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-slate-900);
}

.logo-mark {
    width: 40px;
    height: 40px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

/* Logo Style 1: Layered Bars */
.logo-style-1 .logo-mark {
    flex-direction: column;
    justify-content: center;
    gap: 3px;
}

.logo-style-1 .layer {
    height: 4px;
    border-radius: 2px;
}

.logo-style-1 .layer1 { width: 40px; background: #2563eb; }
.logo-style-1 .layer2 { width: 34px; background: #3b82f6; }
.logo-style-1 .layer3 { width: 28px; background: #60a5fa; }
.logo-style-1 .layer4 { width: 22px; background: #93c5fd; }

/* Logo Style 3: Mountain Strata (footer) */
.logo-style-3 svg {
    width: 40px;
    height: 40px;
}

/* Navigation */
nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav a {
    color: var(--color-slate-600);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

nav a:hover {
    color: var(--color-slate-900);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    padding: 10rem var(--spacing-container) 6rem;
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.hero-content {
    max-width: 680px;
}

.hero-tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--color-slate-100);
    border-radius: 100px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-slate-600);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 700;
    color: var(--color-slate-900);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.125rem;
    color: var(--color-slate-600);
    max-width: 540px;
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Dividers
   -------------------------------------------------------------------------- */
.divider {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-container);
}

.divider-line {
    height: 1px;
    background: var(--color-slate-200);
}

/* --------------------------------------------------------------------------
   Companies Section
   -------------------------------------------------------------------------- */
.companies {
    padding: var(--spacing-section) var(--spacing-container);
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.section-header {
    margin-bottom: 3rem;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-slate-400);
    margin-bottom: 0.75rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-slate-900);
}

/* Company Card */
.company-card {
    background: var(--color-slate-50);
    border: 1px solid var(--color-slate-200);
    border-radius: 16px;
    padding: 2.5rem;
    transition: all var(--transition-medium);
}

.company-card:hover {
    border-color: var(--color-slate-300);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.company-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.company-logo-mark {
    width: 48px;
    height: 48px;
    background: var(--color-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.company-logo-mark svg {
    width: 28px;
    height: 28px;
}

.company-name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-slate-900);
}

.company-desc {
    color: var(--color-slate-600);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.company-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: gap var(--transition-fast);
}

.company-link:hover {
    gap: 0.75rem;
}

.company-link svg {
    width: 18px;
    height: 18px;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact {
    padding: var(--spacing-section) var(--spacing-container);
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-slate-900);
    margin-bottom: 1rem;
}

.contact-info > p {
    color: var(--color-slate-600);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: var(--color-slate-100);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-slate-600);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-item-content {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-slate-500);
    margin-bottom: 0.25rem;
}

.contact-value {
    color: var(--color-slate-900);
    text-decoration: none;
    font-weight: 500;
}

.contact-value:hover {
    color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Form Styles
   -------------------------------------------------------------------------- */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-group label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-slate-700);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-slate-300);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--color-slate-900);
    transition: all var(--transition-fast);
    background: var(--color-white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-slate-400);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.submit-btn {
    background: var(--color-accent);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.submit-btn:hover {
    background: var(--color-accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Form States */
.form-success,
.form-error {
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9375rem;
    display: none;
}

.form-success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.form-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.form-success.show,
.form-error.show {
    display: block;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
footer {
    margin-top: auto;
    background: var(--color-slate-900);
    color: var(--color-slate-400);
    padding: 2rem;
}

.footer-inner {
    max-width: var(--max-width);
    padding: 0 var(--spacing-container);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.footer-logo-mark {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-logo-mark svg {
    width: 32px;
    height: 32px;
}

.footer-logo-text {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-slate-200);
    letter-spacing: -0.01em;
}

.footer-copy {
    font-size: 0.875rem;
    color: var(--color-slate-400);
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content {
    animation: fadeInUp 0.6s ease-out;
}

.company-card {
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.contact-info {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.contact-form {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

/* Scroll-triggered animations (activated via JS) */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --spacing-section: 3.5rem;
        --spacing-container: 1.5rem;
    }
    
    .hero {
        padding-top: 8rem;
        padding-bottom: 4rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-container: 1rem;
    }
    
    .hero h1 {
        font-size: 1.875rem;
    }
    
    .company-card {
        padding: 1.5rem;
    }
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }