/* Stratum Scale - Premium Institutional Design System */

:root {
    --bg-page: #050505;
    --bg-card: #0a0a0a;
    --bg-glass: rgba(10, 10, 10, 0.82);

    --border-subtle: #1f1f1f;
    --border-strong: #343434;

    --text-primary: #ededed;
    --text-secondary: #a1a1aa;
    --text-tertiary: #575763;

    --accent-primary: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.15);

    --success: #10b981;
    --warning: #f59e0b;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: 'Avenir Next', 'Segoe UI', 'SF Pro Text', 'Inter', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: 16px;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 500;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.mono {
    font-family: 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', monospace;
    letter-spacing: -0.02em;
}

/* Font Awesome alignment helpers. */
i.fa-solid,
i.fa-brands {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    vertical-align: middle;
}

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

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

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

.text-accent {
    color: var(--accent-primary);
}

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

.grid {
    display: grid;
    gap: var(--space-md);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.25rem 0;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

nav.is-scrolled {
    background: rgba(10, 10, 10, 0.94);
    border-bottom-color: var(--border-strong);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.nav-logo {
    font-family: 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', monospace;
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    white-space: nowrap;
}

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

.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    border-radius: 6px;
    padding: 0.45rem 0.75rem;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-page);
    border: 1px solid var(--text-primary);
}

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

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

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

.btn-accent {
    background: var(--accent-primary);
    color: white;
    border: 1px solid var(--accent-primary);
    box-shadow: 0 0 15px var(--accent-glow);
}

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

.hero {
    padding: 10rem 0 6rem;
    position: relative;
    overflow: hidden;
    text-align: left;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, rgba(5, 5, 5, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

.hero h1 {
    font-size: 4.2rem;
    line-height: 1.08;
    font-weight: 500;
    margin-bottom: 1.35rem;
    background: linear-gradient(to bottom right, #fff, #8e8e96);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 620px;
    margin-bottom: 2.2rem;
    font-weight: 300;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 2rem;
    transition: var(--transition-fast);
}

.card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 22px -12px rgba(0, 0, 0, 0.5);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    min-height: 70vh;
}

body.is-navigating main {
    opacity: 0.78;
}

footer {
    border-top: 1px solid var(--border-subtle);
    padding: 6rem 0 3rem;
    background: var(--bg-page);
    color: var(--text-tertiary);
}

.footer-brand {
    margin-bottom: 2rem;
}

.footer-primary {
    grid-column: span 2;
}

.footer-links a {
    display: block;
    margin-bottom: 0.75rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text-primary);
}

input,
select,
textarea {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent-primary) !important;
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.section {
    padding: 5rem 0;
}

.section-divider {
    border-top: 1px solid var(--border-subtle);
}

.eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.section-intro {
    max-width: 760px;
    margin-bottom: 2rem;
}

.section-intro h2 {
    font-size: 2.1rem;
    margin-bottom: 0.55rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-note {
    font-size: 0.88rem;
    margin-top: 1rem;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.metric-card {
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.01);
    border-radius: 8px;
    padding: 1.2rem;
}

.metric-value {
    font-size: 2rem;
    line-height: 1;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.65rem;
    font-variant-numeric: tabular-nums;
}

.metric-label {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.service-grid {
    align-items: stretch;
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}

.service-code {
    font-size: 0.75rem;
    margin-bottom: 0.75rem;
}

.service-link {
    display: inline-flex;
    align-items: center;
    margin-top: 1rem;
    font-size: 0.88rem;
    color: var(--accent-primary);
    border-bottom: 1px solid transparent;
}

.service-link:hover {
    border-bottom-color: var(--accent-primary);
}

.service-icon {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 6px;
    border: 1px solid var(--border-strong);
    background: rgba(37, 99, 235, 0.06);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #6ea2ff;
    margin-bottom: 0.95rem;
}

.logo-marquee {
    overflow: hidden;
    padding: 1rem 0;
    background: rgba(255, 255, 255, 0.015);
    mask-image: linear-gradient(
        to right,
        transparent,
        #000 8%,
        #000 92%,
        transparent
    );
}

.logo-track {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: max-content;
    animation: logo-scroll 32s linear infinite;
}

.logo-marquee:hover .logo-track {
    animation-play-state: paused;
}

.logo-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    color: var(--text-secondary);
    font-size: 0.86rem;
    padding: 0.42rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.01);
}

.logo-item i,
.logo-item svg {
    color: #8f9bb2;
}

.cta-card {
    background: rgba(255, 255, 255, 0.015);
    border-color: var(--border-strong);
}

.cta-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
}

@keyframes logo-scroll {
    from {
        transform: translateX(0);
    }
    to {
        transform: translateX(-50%);
    }
}

@media (max-width: 960px) {
    .metric-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    .section-intro h2 {
        font-size: 1.55rem;
    }

    .hero {
        padding: 7.25rem 0 3.4rem;
    }

    .hero h1 {
        font-size: 2.2rem !important;
        line-height: 1.12;
        margin-bottom: 1rem;
        background: none;
        -webkit-text-fill-color: var(--text-primary);
    }

    .hero p {
        font-size: 1rem;
        margin-bottom: 1.15rem;
    }

    .card {
        padding: 1.25rem;
    }

    .metric-grid {
        grid-template-columns: 1fr;
    }

    .metric-value {
        font-size: 1.7rem;
    }

    .logo-marquee {
        mask-image: none;
    }

    footer {
        padding: 3rem 0 2rem;
    }

    .footer-primary {
        grid-column: span 1;
    }

    footer .container > div:last-child {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 0.45rem !important;
    }

    .nav-toggle {
        display: inline-flex;
        margin-left: auto;
    }

    .nav-container {
        align-items: flex-start;
        flex-wrap: wrap;
    }

    .nav-links {
        width: 100%;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0.55rem;
        padding-top: 0.75rem;
    }

    body.nav-open .nav-links {
        display: flex;
    }

    .nav-link,
    .nav-links .btn {
        width: 100%;
        justify-content: flex-start;
        border: 1px solid var(--border-subtle);
        border-radius: 6px;
        padding: 0.55rem 0.7rem;
    }

    .nav-links .btn {
        justify-content: center;
    }
}

@media (max-width: 520px) {
    nav {
        padding: 0.8rem 0;
    }

    .nav-logo {
        font-size: 0.72rem;
        letter-spacing: 0.2em;
    }

    .hero h1 {
        font-size: 1.9rem !important;
    }

    .cta-card h2 {
        font-size: 1.25rem;
    }

    .metric-value {
        font-size: 1.45rem;
    }
}

@media (hover: none) and (pointer: coarse) {
    .logo-track {
        animation: none;
    }
}

@media (max-width: 768px) {
    .about-page {
        padding-top: 6.9rem !important;
    }

    .about-intro h1 {
        font-size: 2rem !important;
        line-height: 1.15 !important;
    }

    .about-intro p {
        font-size: 1rem !important;
    }

    .about-phases,
    .about-detail-grid {
        margin-top: 1.1rem !important;
        gap: 1rem;
    }

    .about-panel {
        padding: 1.25rem !important;
    }

    .about-founder-row {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 0.35rem !important;
    }

    .contact-page {
        padding: 6.9rem 0 3rem !important;
    }

    .contact-heading {
        margin-bottom: 1.25rem !important;
    }

    .contact-heading h1 {
        font-size: 2rem !important;
        line-height: 1.12 !important;
    }

    .contact-form-card {
        padding: 1.15rem !important;
    }

    .contact-page .grid.grid-2 {
        grid-template-columns: 1fr !important;
        gap: 0.85rem !important;
        margin-bottom: 0.9rem !important;
    }

    .legal-page {
        padding: 6.9rem 0 3rem !important;
    }

    .legal-page h1 {
        font-size: 2rem !important;
        line-height: 1.14;
    }

    .legal-page .card {
        padding: 1.1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .card {
        transition: none;
    }

    .card:hover {
        transform: none;
        box-shadow: none;
    }

    .logo-track {
        animation: none;
    }
}