/* Helix Quantica - Global Styles */

:root {
    --bg: #000000;
    --fg: #ffffff;
    --muted: #a3a3a3;
    --border: #262626;
    --accent: #e5e5e5;
    --header-height: 4.5rem;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    text-decoration: underline;
}

.container {
    width: min(100% - 2rem, 75rem);
    margin-inline: auto;
}

.narrow {
    max-width: 44rem;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo-link {
    display: flex;
    align-items: center;
}

.logo {
    width: 12rem; /* Desktop logo width */
    height: auto;
    transition: transform 0.2s ease;
}

.logo-link:hover .logo {
    transform: scale(1.02);
}

/* Navigation */
.main-nav {
    position: relative;
    margin-left: auto;
    display: inline-flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    padding: 0.5rem 0;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    border-bottom-color: var(--fg);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--fg);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    top: 6px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    transform: translateY(-6px) rotate(-45deg);
}

/* Hero */
.hero {
    padding: 8rem 0 6rem;
    border-bottom: 1px solid var(--border);
}

.hero-content {
    max-width: 48rem;
}

.hero-logo {
    width: min(100%, 42rem);
    height: auto;
    margin: 0 0 1.5rem;
}

.hero-tagline {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 500;
    line-height: 1.3;
    margin: 0 0 1.5rem;
    color: var(--muted);
    letter-spacing: -0.01em;
}

.lead {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--muted);
    margin: 0 0 2rem;
    line-height: 1.6;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.6rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 0.25rem;
    border: 1px solid var(--fg);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn-primary {
    background-color: var(--fg);
    color: var(--bg);
}

.btn-primary:hover {
    background-color: var(--accent);
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--fg);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.08);
    text-decoration: none;
}

/* Sections */
.section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border);
}

.section-page {
    padding-top: 4rem;
}

.section h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin: 0 0 1.25rem;
    letter-spacing: -0.02em;
}

.section h2 {
    font-size: 1.35rem;
    font-weight: 600;
    margin: 2.5rem 0 0.75rem;
}

.section h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.section p {
    color: var(--muted);
    margin: 0 0 1rem;
}

/* Grid & Cards */
.grid {
    display: grid;
    gap: 1.5rem;
}

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

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

.card {
    padding: 1.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
    border-color: var(--muted);
    transform: translateY(-2px);
}

.card p {
    margin: 0;
}

.value-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0;
}

.value-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    color: var(--muted);
}

.value-list li:last-child {
    border-bottom: none;
}

/* Contact form */
.contact-form {
    margin-top: 2.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    background-color: transparent;
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    font: inherit;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--muted);
}

.contact-alt {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* Footer */
.site-footer {
    padding: 2rem 0;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.footer-inner p {
    margin: 0;
}

.footer-links a {
    color: var(--muted);
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --header-height: 4rem;
    }

    .logo {
        width: 9rem; /* Smaller logo on phones */
    }

    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: calc(var(--header-height) - 1rem);
        right: 0;
        flex-direction: column;
        gap: 0;
        min-width: 12rem;
        max-width: calc(100vw - 2rem);
        background-color: var(--bg);
        border: 1px solid var(--border);
        border-radius: 0.5rem;
        padding: 0.5rem 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-0.5rem);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
        z-index: 200;
    }

    .nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-menu a {
        display: block;
        padding: 0.75rem 1.25rem;
        border-bottom: none;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
        background-color: rgba(255, 255, 255, 0.06);
        border-bottom-color: transparent;
    }

    .hero {
        padding: 4rem 0 3.5rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 3rem 0;
    }

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