/* ============================================================
   EIGEN — Dark Cinematic Aerospace Landing Page
   Full-bleed ASCII Hero · Minimal Navigation
   ============================================================ */

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

:root {
    /* Monochromatic palette */
    --color-bg:              #000000;
    --color-bg-elevated:     #060608;
    --color-text:            #ffffff;
    --color-text-secondary:  rgba(255, 255, 255, 0.50);
    --color-text-tertiary:   rgba(255, 255, 255, 0.25);
    --color-accent:          #ffffff;
    --color-border:          rgba(255, 255, 255, 0.06);
    --color-border-hover:    rgba(255, 255, 255, 0.14);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Bebas Neue', 'Impact', 'Arial Narrow', sans-serif;

    /* Motion */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 0.35s var(--ease-out-expo);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
}

::selection {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

.btn-primary::selection {
    background: rgba(0, 0, 0, 0.3);
    color: #000;
}

/* Navigation
   ------------------------------------------------------------ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 clamp(2.5rem, 5vw, 4.5rem);
    height: 72px;
    display: flex;
    align-items: center;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-base);
}

.nav-container {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text);
}

.nav-logo-text {
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color var(--transition-base);
}

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

/* Hero — Full-bleed ASCII Canvas
   ------------------------------------------------------------ */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 600px;
    background: var(--color-bg);
    overflow: hidden;
}

#ascii-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    pointer-events: none;
    background: linear-gradient(
        to right,
        rgba(0, 0, 0, 0.7) 0%,
        rgba(0, 0, 0, 0.4) 40%,
        rgba(0, 0, 0, 0.0) 70%
    );
}

.hero-content {
    padding: clamp(2.5rem, 5vw, 4.5rem);
    padding-bottom: clamp(3rem, 6vh, 5rem);
    max-width: 560px;
    pointer-events: auto;
    opacity: 0;
    animation: fadeUp 1s var(--ease-out-expo) 0.15s forwards;
}

.hero-headline {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 7vw, 7rem);
    font-weight: 400;
    line-height: 0.95;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.hero-subtitle {
    font-size: clamp(0.9375rem, 1.4vw, 1.125rem);
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 380px;
}

.hero-cta {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Buttons
   ------------------------------------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2.25rem;
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(255, 255, 255, 0.15);
}

/* Footer
   ------------------------------------------------------------ */
.footer {
    padding: 4rem 2.5rem;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-logo {
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.25em;
}

.footer-tagline {
    color: var(--color-text-tertiary);
    font-size: 0.8125rem;
    margin-top: 0.375rem;
}

.footer-links {
    display: flex;
    gap: 2.5rem;
}

.footer-links a {
    color: var(--color-text-tertiary);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: color var(--transition-base);
}

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

.footer-copyright {
    width: 100%;
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    margin-top: 2rem;
}

.footer-copyright p {
    color: var(--color-text-tertiary);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
}

/* ASCII Controls Panel
   ------------------------------------------------------------ */
.ascii-controls-wrap {
    position: absolute;
    bottom: clamp(1.5rem, 3vh, 2.5rem);
    right: clamp(1.5rem, 3vw, 2.5rem);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
}

.ascii-controls-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
    padding: 0;
}

.ascii-controls-toggle:hover {
    color: rgba(255, 255, 255, 0.7);
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.6);
}

.ascii-controls-wrap.open .ascii-controls-toggle {
    color: rgba(255, 255, 255, 0.7);
    border-color: rgba(255, 255, 255, 0.18);
}

.ascii-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    font-family: 'Inter', monospace;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
    pointer-events: none;
}

.ascii-controls-wrap.open .ascii-controls {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.ascii-controls-row {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.ascii-controls-row label {
    font-size: 0.5625rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.35);
    min-width: 62px;
    flex-shrink: 0;
}

.ascii-controls-row input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 2px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 1px;
    outline: none;
    cursor: pointer;
}

.ascii-controls-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.ascii-controls-row input[type="range"]::-webkit-slider-thumb:hover {
    background: rgba(255, 255, 255, 0.9);
}

.ascii-controls-row input[type="range"]::-moz-range-thumb {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    border: none;
    cursor: pointer;
}

.ascii-controls-val {
    font-size: 0.5625rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    color: rgba(255, 255, 255, 0.3);
    min-width: 28px;
    text-align: right;
}

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

/* Responsive
   ------------------------------------------------------------ */
@media (max-width: 768px) {
    .nav {
        padding: 0 clamp(1.5rem, 4vw, 2.5rem);
    }

    .nav-links {
        display: none;
    }

    .hero {
        min-height: 100vh;
    }

    .hero-overlay {
        background: linear-gradient(
            to top,
            rgba(0, 0, 0, 0.8) 0%,
            rgba(0, 0, 0, 0.3) 50%,
            rgba(0, 0, 0, 0.0) 100%
        );
        align-items: flex-end;
    }

    .hero-headline {
        font-size: clamp(2rem, 5vw, 3rem);
    }

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

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        text-align: center;
    }

    .ascii-controls-wrap {
        display: none;
    }
}