/* OptiFocus — slate midnight + cyan (distinct from previous warm theme) */

:root {
    --color-bg-primary: #e8eef5;
    --color-bg-secondary: #dce5f0;
    --color-bg-elevated: #ffffff;
    --color-bg-muted: #cbd5e1;

    --color-ink: #0f172a;
    --color-accent-primary: #0891b2;
    --color-accent-deep: #0e7490;
    --color-accent-primary-hover: #06b6d4;
    --color-accent-violet: #7c3aed;
    --color-accent-cyan: #22d3ee;
    --color-highlight: #38bdf8;
    --color-cta: #0ea5e9;
    --color-cta-hover: #0284c7;

    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-muted: #64748b;

    --color-border: rgba(15, 23, 42, 0.12);
    --color-border-strong: rgba(15, 23, 42, 0.22);

    --color-header-bg: linear-gradient(180deg, #020617 0%, #0f172a 100%);
    --color-header-border: rgba(34, 211, 238, 0.35);

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Space Grotesk', 'Inter', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.1);
    --shadow-brutal: 6px 6px 0 #0f172a;
    --shadow-brutal-sm: 4px 4px 0 #0f172a;
    --shadow-glow-accent: 0 0 24px rgba(34, 211, 238, 0.25);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-blob: 20px;

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

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

html {
    scroll-behavior: smooth;
}

::selection {
    background: rgba(34, 211, 238, 0.25);
    color: var(--color-ink);
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.65;
    overflow-x: hidden;
    position: relative;
    font-feature-settings: 'kern' 1, 'liga' 1;
    -webkit-font-smoothing: antialiased;
}

main {
    position: relative;
    z-index: 1;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 1px 1px, rgba(15, 23, 42, 0.04) 1px, transparent 0),
        linear-gradient(180deg, #e8eef5 0%, #dfe8f2 50%, #e2ebf5 100%);
    background-size: 20px 20px, 100% 100%;
    pointer-events: none;
    z-index: 0;
}

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-header-bg);
    border-bottom: 3px solid var(--color-accent-cyan);
    box-shadow: 0 8px 32px rgba(2, 6, 23, 0.55);
    transition: var(--transition-base);
}

.main-header::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -3px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.6), transparent);
    pointer-events: none;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: var(--transition-base);
}

.logo::before {
    content: '';
    width: 12px;
    height: 12px;
    background: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-violet));
    border-radius: 3px;
    transform: rotate(45deg);
    box-shadow: 0 0 16px rgba(34, 211, 238, 0.5);
    flex-shrink: 0;
}

.logo:hover {
    transform: translateY(-1px);
    filter: brightness(1.08);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: #f8fafc;
    letter-spacing: -0.04em;
    text-transform: uppercase;
}

.logo-image {
    height: 50px;
    width: auto;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: #94a3b8;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    position: relative;
    transition: var(--transition-base);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.nav-link:hover {
    color: #f8fafc;
    background: rgba(34, 211, 238, 0.12);
    box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.35);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(34, 211, 238, 0.4);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0.55rem 0.65rem;
}

.mobile-menu-toggle span {
    width: 22px;
    height: 2px;
    background: #f1f5f9;
    transition: var(--transition-base);
    border-radius: 1px;
}

.main-footer {
    position: relative;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-top: calc(var(--spacing-lg) + 8px);
    background: linear-gradient(180deg, #020617 0%, #0f172a 55%, #1e293b 100%);
    z-index: 1;
    box-shadow: 0 -24px 64px rgba(2, 6, 23, 0.45);
}

.main-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-cyan), var(--color-accent-violet), var(--color-cta));
    background-size: 200% 100%;
    animation: footerBar 8s linear infinite;
}

@keyframes footerBar {
    0% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 200% 50%;
    }
}

.main-footer::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(148, 163, 184, 0.25), transparent);
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    text-align: center;
}

.footer-text,
.footer-links {
    color: #cbd5e1;
    font-size: 0.875rem;
    line-height: 1.85;
}

.footer-link {
    color: #22d3ee;
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 600;
}

.footer-link:hover {
    color: #a5f3fc;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.contact-link {
    color: var(--color-accent-deep);
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 600;
    border-bottom: 2px solid rgba(8, 145, 178, 0.35);
}

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

.legacy-asset {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.content-image-wrapper {
    position: relative;
}

@media (prefers-reduced-motion: reduce) {
    .main-footer::before {
        animation: none;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: linear-gradient(180deg, #0f172a 0%, #020617 100%);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0.25rem;
        transform: translateX(-100%);
        transition: var(--transition-base);
        border-bottom: 2px solid rgba(34, 211, 238, 0.3);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        border-radius: var(--radius-sm);
        border-bottom: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: var(--spacing-sm);
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .logo-image {
        height: 40px;
    }
}