/* ====================================
   BrainArray — Main Stylesheet
   ==================================== */


/* ---- Design Tokens ---- */

:root {
    /* Colors */
    --color-black: #0a0a0a;
    --color-white: #f5f3ef;
    --color-gray-100: #e8e6e0;
    --color-gray-200: #d0cec8;
    --color-gray-300: #a8a6a0;
    --color-gray-400: #787670;
    --color-gray-500: #585650;
    --color-gray-600: #383630;
    --color-gray-700: #1a1a18;

    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Manrope', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* Layout */
    --max-width: 1100px;
    --max-width-narrow: 750px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.2s ease;
    --transition-med: 0.3s ease;
}


/* ---- Base ---- */

body {
    font-family: var(--font-body);
    background: var(--color-white);
    color: var(--color-black);
    overflow-x: hidden;
}

::selection {
    background: var(--color-black);
    color: var(--color-white);
}


/* ---- Animations ---- */

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

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

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}


/* ====================================
   Components
   ==================================== */


/* ---- Navigation ---- */

.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 0.7rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(245, 243, 239, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    transition: var(--transition-med);
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav__logo-image {
    display: block;
    width: auto;
    object-fit: contain;
}

.nav__logo-image--icon {
    height: 38px;
}

.nav__logo-image--text {
    height: 90px;
    padding-top: 15px;
}

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

.nav__link {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-gray-400);
    letter-spacing: 0.04em;
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-black);
}

.nav__cta {
    background: var(--color-black);
    color: var(--color-white);
    padding: 0.55rem 1.4rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav__cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    color: var(--color-white);
}


/* ---- Buttons ---- */

.btn-primary {
    display: inline-block;
    background: var(--color-black);
    color: var(--color-white);
    padding: 0.85rem 2.2rem;
    border-radius: 100px;
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.18);
    color: var(--color-white);
}

.btn-primary--inverted {
    background: var(--color-white);
    color: var(--color-black);
}

.btn-primary--inverted:hover {
    color: var(--color-black);
}

.btn-ghost {
    display: inline-block;
    color: var(--color-gray-400);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.85rem 1rem;
    transition: color var(--transition-fast);
}

.btn-ghost:hover {
    color: var(--color-black);
}


/* ---- Hero ---- */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-lg) var(--space-xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.02) 0%, transparent 70%);
    pointer-events: none;
}

.hero__logo {
    display: block;
    height: 80px;
    width: auto;
    margin-top: 0.5rem;
    margin-bottom: 1.25rem;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--color-gray-400);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 2.5rem;
    animation: fadeDown 0.6s ease both 0.1s;
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-black);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.03em;
    max-width: 800px;
    margin-bottom: 1.5rem;
    animation: fadeUp 0.7s ease both 0.2s;
}

.hero__title em {
    font-style: italic;
    opacity: 0.4;
}

.hero__subtitle {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-gray-400);
    max-width: 500px;
    line-height: 1.65;
    margin-bottom: 2.5rem;
    animation: fadeUp 0.7s ease both 0.35s;
}

.hero__cta-group {
    display: flex;
    gap: 1rem;
    align-items: center;
    animation: fadeUp 0.7s ease both 0.5s;
}


/* ---- Features ---- */

.features {
    padding: var(--space-2xl) var(--space-lg) var(--space-3xl);
    max-width: var(--max-width);
    margin: 0 auto;
}

.features__header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.features__header h2 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.features__header p {
    color: var(--color-gray-400);
    font-size: 1rem;
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.6;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    padding: 2rem;
    border: 1px solid var(--color-gray-100);
    border-radius: 12px;
    transition: all var(--transition-med);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--color-black);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-out);
}

.feature-card:hover {
    border-color: var(--color-gray-200);
    transform: translateY(-3px);
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-card__icon {
    width: 40px;
    height: 40px;
    background: var(--color-black);
    color: var(--color-white);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
}

.feature-card__title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.feature-card__desc {
    color: var(--color-gray-400);
    font-size: 0.85rem;
    line-height: 1.55;
}


/* ---- Plus Section ---- */

.plus {
    padding: 5rem var(--space-lg);
    background: var(--color-black);
    color: var(--color-white);
}

.plus__inner {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.plus__badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--color-gray-500);
    border-radius: 3px;
    letter-spacing: 0.12em;
    color: var(--color-gray-300);
    margin-bottom: 1rem;
}

.plus__title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.plus__desc {
    color: var(--color-gray-300);
    font-size: 0.95rem;
    line-height: 1.65;
    margin-bottom: 1.5rem;
}

.plus__features {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.plus__features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--color-gray-200);
}

.plus__features li::before {
    content: '\25C6';
    font-size: 0.5rem;
    color: var(--color-gray-400);
}


/* ---- Footer ---- */

.footer {
    padding: 3rem var(--space-lg);
    border-top: 1px solid var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer__copy {
    font-size: 0.75rem;
    color: var(--color-gray-300);
}

.footer__links {
    display: flex;
    gap: 1.5rem;
}

.footer__link {
    font-size: 0.75rem;
    color: var(--color-gray-300);
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-black);
}

/* Footer on dark backgrounds */
.footer--dark {
    border-top-color: var(--color-gray-600);
}

.footer--dark .footer__copy,
.footer--dark .footer__link {
    color: var(--color-gray-500);
}

.footer--dark .footer__link:hover {
    color: var(--color-gray-300);
}


/* ---- About Page ---- */

.about-hero {
    padding: 10rem var(--space-lg) var(--space-xl);
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.about-hero__title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    letter-spacing: -0.03em;
    line-height: 1.1;
    animation: fadeUp 0.6s ease both 0.1s;
}

.about-content {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg) var(--space-2xl);
}

.about-content__text {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--color-gray-500);
    margin-bottom: 1.5rem;
}

.about-content__text--lead {
    font-size: 1.2rem;
    color: var(--color-gray-600);
}

.about-content__divider {
    width: 40px;
    height: 2px;
    background: var(--color-black);
    margin: 2.5rem 0;
}

.about-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 3rem 0;
}

.about-value__title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.about-value__desc {
    font-size: 0.88rem;
    color: var(--color-gray-400);
    line-height: 1.55;
}


/* ====================================
   Responsive
   ==================================== */

@media (max-width: 768px) {
    .nav {
        padding: 1rem 1.5rem;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.85rem;
    }

     .hero {
        padding-top: 12rem;
    }

    .nav__logo {
        justify-content: center;
        flex-wrap: wrap;
    }

    .nav__links {
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
        flex-wrap: wrap;
        gap: 0.75rem 1rem;
    }

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

    .plus__inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

    .footer {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero__cta-group {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 1rem;
    }

    .nav__links {
        gap: 0.5rem 0.75rem;
    }

    .nav__link,
    .nav__cta {
        display: inline-block;
        font-size: 0.78rem;
    }

  
}