/* ============================================
   Human Digital Minds — Main Stylesheet
   ============================================ */

:root {
    --color-primary: #1e293b;
    --color-muted: #64748b;
    --color-light: #94a3b8;
    --color-accent: #4a9eff;
    --color-success: #22c55e;
    --color-bg: #ffffff;
    --color-surface: #f8fafc;
    --color-border: #e2e8f0;
    --color-hero-start: #0f0f1a;
    --color-hero-end: #16213e;
    --radius-sm: 4px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50%;
    --container: 900px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: var(--color-primary);
    line-height: 1.7;
    background: var(--color-bg);
}

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

a {
    color: inherit;
    text-decoration: none;
}

/* Container */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---- Navigation ---- */
.nav {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav__inner {
    max-width: var(--container);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.nav__logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary);
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.nav__link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-muted);
    transition: color 0.2s;
}

.nav__link:hover {
    color: var(--color-primary);
}

.lang-switcher {
    display: flex;
    margin-left: 8px;
}

.lang-switcher__item {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-muted);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    background: var(--color-surface);
}

.lang-switcher__item + .lang-switcher__item {
    margin-left: 2px;
}

.lang-switcher__item--active {
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-border);
}

/* ---- Hero ---- */
.hero {
    background: linear-gradient(135deg, var(--color-hero-start) 0%, var(--color-hero-end) 100%);
    color: white;
    padding: 80px 20px;
}

.hero__inner {
    max-width: var(--container);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.hero__content {
    flex: 1;
    min-width: 300px;
}

.hero__badge {
    display: inline-block;
    background: var(--color-success);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
}

.hero__title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    line-height: 1.1;
    color: white;
}

.hero__subtitle {
    font-size: 1.35rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    line-height: 1.5;
    font-style: italic;
}

.hero__description {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
}

.hero__actions {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.hero__cover {
    flex: 0 0 200px;
}

.hero__cover img {
    width: 200px;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: opacity 0.2s, box-shadow 0.2s;
    cursor: pointer;
    border: none;
}

.btn:hover {
    opacity: 0.9;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

.btn--outline {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn--outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ---- Author ---- */
.author {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 40px 0;
    margin-bottom: 60px;
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.author__photo {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    object-fit: cover;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.author__name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-primary);
}

.author__bio {
    font-size: 1.05rem;
    color: var(--color-muted);
    max-width: 500px;
}

/* ---- Sections ---- */
.section {
    margin-bottom: 60px;
}

.section__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ---- Project Cards ---- */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.card--featured {
    max-width: 100%;
    border-left: 3px solid var(--color-accent);
}

.card--featured .card__title {
    font-size: 1.6rem;
}

.card__subtitle {
    font-size: 1rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.card__icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-primary);
}

.card__text {
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: 16px;
    line-height: 1.6;
}

.card__note {
    font-size: 0.8rem;
    color: var(--color-light);
    font-style: italic;
    margin-bottom: 8px;
}

.card__badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-success);
    border: 1px solid var(--color-success);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.card__link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: opacity 0.2s;
}

.card__link:hover {
    opacity: 0.8;
}

/* ---- Archive ---- */
.archive-box {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--color-border);
}

.archive-box__title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.archive-box__text {
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.archive-box__link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
}

.archive-box__link:hover {
    opacity: 0.8;
}

/* ---- Footer ---- */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 48px 0;
    margin-top: 80px;
}

.footer__links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer__link {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-primary);
    font-weight: 500;
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
    transition: background 0.2s, transform 0.2s;
}

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

.footer__copy {
    font-size: 0.85rem;
    color: var(--color-light);
}

/* ---- Book Page ---- */
.book-text p {
    font-size: 1.15rem;
    color: #334155;
    line-height: 1.9;
    margin-bottom: 1.5em;
}

.book-text--bold {
    font-weight: 500;
    color: var(--color-primary);
}

.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 60px 0;
}

.book-structure {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.book-act__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.book-act__chapters {
    font-size: 1rem;
    color: var(--color-muted);
    padding-left: 16px;
    border-left: 2px solid var(--color-border);
}

.book-quote {
    font-size: 1.25rem;
    color: var(--color-primary);
    font-weight: 500;
    font-style: italic;
}

.cta-box {
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-border) 100%);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    margin-bottom: 60px;
}

.cta-box__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.cta-box__text {
    font-size: 1rem;
    color: var(--color-muted);
    margin-bottom: 24px;
}

/* ---- DNA Page ---- */
.dna-dark-box {
    padding: 32px;
    background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
    border-radius: 16px;
    color: white;
    margin-bottom: 60px;
}

.dna-dark-box__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 28px;
    color: white;
}

.dna-feature {
    margin-bottom: 24px;
}

.dna-feature:last-child {
    margin-bottom: 0;
}

.dna-feature__title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-accent);
}

.dna-feature__text {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
}

.dna-phases {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.dna-phase {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.dna-phase__number {
    flex: 0 0 48px;
    height: 48px;
    background: var(--color-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
}

.dna-phase__title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-accent);
}

.dna-phase__text {
    font-size: 0.95rem;
    color: #475569;
    line-height: 1.7;
}

.dna-coming-soon {
    margin-bottom: 60px;
    padding: 32px;
    background: var(--color-surface);
    border-radius: 16px;
    border: 2px dashed var(--color-accent);
    text-align: center;
}

.dna-coming-soon__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-primary);
}

.dna-coming-soon__subtitle {
    font-size: 1.05rem;
    color: #475569;
    margin-bottom: 24px;
}

.dna-coming-soon__list {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    text-align: left;
    margin-bottom: 20px;
}

.dna-coming-soon__list p {
    font-size: 0.95rem;
    color: #475569;
    margin-bottom: 12px;
}

.dna-coming-soon__list p:last-child {
    margin-bottom: 0;
}

.dna-coming-soon__note {
    font-size: 0.95rem;
    color: var(--color-muted);
    font-style: italic;
}

.dna-cta {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    margin-bottom: 60px;
}

.dna-cta__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.dna-cta__text {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 8px;
}

.dna-cta__subtext {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ---- ADE Page ---- */
.ade-repo-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.ade-repo-card__header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.ade-repo-card__icon {
    font-size: 2.5rem;
}

.ade-repo-card__name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.ade-repo-card__tagline {
    font-size: 0.95rem;
    color: var(--color-muted);
}

.ade-repo-card__desc {
    font-size: 1.05rem;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 24px;
}

.ade-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.ade-features__item {
    padding: 20px;
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.ade-features__item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-primary);
}

.ade-features__item p {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.6;
}

.ade-repo-card__tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ade-tech-badge {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--color-border);
    color: var(--color-primary);
}

/* Hero pretitle */
.hero__pretitle {
    font-size: 0.85rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

/* 2-column card grid */
.cards--2col {
    grid-template-columns: repeat(2, 1fr);
}

/* Compact author (for sub-pages) */
.author--compact {
    background: var(--color-surface);
    padding: 32px;
    border-radius: 16px;
    border-bottom: none;
    margin-bottom: 60px;
}

.author--compact .author__photo {
    width: 80px;
    height: 80px;
}

.author--compact .author__name {
    font-size: 1.1rem;
}

.author--compact .author__bio {
    font-size: 0.95rem;
}

/* Button Amazon variant */
.btn--amazon {
    background: #ff9900;
    color: #111;
}

/* Focus states for accessibility */
.btn:focus-visible,
.nav__link:focus-visible,
.card__link:focus-visible,
.footer__link:focus-visible,
.lang-switcher__item:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ---- Notes ---- */
.note {
    max-width: 680px;
    padding: 3rem 0 4rem;
}

.note__meta {
    font-size: 0.85rem;
    color: var(--color-muted);
    margin-bottom: 0.75rem;
}

.note__title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 2.5rem;
    color: var(--color-primary);
}

.note__back {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.nav__link--active {
    color: var(--color-primary);
    font-weight: 600;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .hero {
        padding: 60px 20px;
    }

    .hero__title {
        font-size: 2.2rem;
    }

    .hero__subtitle {
        font-size: 1.15rem;
    }

    .hero__inner {
        gap: 40px;
    }

    .hero__cover {
        flex: 0 0 160px;
    }

    .hero__cover img {
        width: 160px;
    }

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

    .author__bio {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 1.8rem;
    }

    .hero__cover {
        flex: 0 0 140px;
    }

    .hero__cover img {
        width: 140px;
    }

    .nav__links {
        gap: 12px;
    }

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

    .cards--2col {
        grid-template-columns: 1fr;
    }
}