/*
  E-Kart project site — dark theme, blue neon accent, blueprint aesthetic.
  Mobile-first: base rules target small screens; breakpoints add layout for
  wider viewports. No third-party fonts — the system font stack keeps the
  site dependency-free and avoids any external network requests.
*/

:root {
    --bg: #070b12;
    --bg-alt: #0b111b;
    --surface: #111927;
    --surface-2: #16202f;
    --border: #223145;
    --text: #e7edf5;
    --text-dim: #93a2b5;
    --accent: #2fd8ff;
    --accent-strong: #8feaff;
    --accent-dim: #0f7d99;
    --accent-glow: rgba(47, 216, 255, 0.35);

    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

    --radius: 10px;
    --container-width: 1120px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        transition-duration: 0.001ms !important;
    }
}

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

a {
    color: var(--accent);
}

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

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--accent);
    color: var(--bg);
    padding: 0.5rem 1rem;
    z-index: 1000;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* ---------- Layout helpers ---------- */

.section {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
}

.section__inner {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.section__title {
    font-size: 1.6rem;
    margin: 0 0 0.5rem;
    letter-spacing: 0.02em;
}

.section__lede {
    color: var(--text-dim);
    max-width: 60ch;
    margin: 0 0 2rem;
}

/* ---------- Header / nav ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(7, 11, 18, 0.9);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--border);
}

.site-header__inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.brand__mark {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent-glow);
}

.primary-nav {
    display: none;
}

.primary-nav__list {
    list-style: none;
    display: flex;
    gap: 1.75rem;
    margin: 0;
    padding: 0;
}

.primary-nav__list a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.15s ease;
}

.primary-nav__list a:hover,
.primary-nav__list a:focus-visible {
    color: var(--accent);
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
}

.nav-toggle__bar {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: var(--accent);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 4rem;
}

.mobile-nav[hidden] {
    display: none;
}

.mobile-nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.mobile-nav__list a {
    color: var(--text);
    text-decoration: none;
    font-size: 1.6rem;
    font-weight: 600;
}

.mobile-nav__list a:hover,
.mobile-nav__list a:focus-visible {
    color: var(--accent);
}

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

.hero {
    position: relative;
    padding: 4.5rem 1.25rem 3.5rem;
    overflow: hidden;
    text-align: center;
}

.hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.25;
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
}

.hero__content {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
}

.hero__eyebrow {
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin: 0 0 0.75rem;
}

.hero__title {
    font-size: 2.75rem;
    margin: 0 0 0.75rem;
    letter-spacing: 0.03em;
    text-shadow: 0 0 24px var(--accent-glow);
}

.hero__tagline {
    color: var(--text-dim);
    font-size: 1.1rem;
    margin: 0 0 2rem;
}

.hero__actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid transparent;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    width: 100%;
    max-width: 260px;
}

.button--primary {
    background: var(--accent);
    color: var(--bg);
    box-shadow: 0 0 20px var(--accent-glow);
}

.button--ghost {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
}

.button:hover,
.button:focus-visible {
    transform: translateY(-1px);
}

/* ---------- Spec sheet ---------- */

.spec-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.spec-group {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.spec-group__title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 0 0 0.9rem;
    font-size: 1.05rem;
    color: var(--accent-strong);
}

.spec-group__glyph {
    font-size: 1.1rem;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.spec-table tr {
    border-top: 1px solid var(--border);
}

.spec-table tr:first-child {
    border-top: none;
}

.spec-table th,
.spec-table td {
    text-align: left;
    padding: 0.55rem 0;
    vertical-align: top;
}

.spec-table th {
    color: var(--text-dim);
    font-weight: 500;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    width: 42%;
    padding-right: 0.75rem;
}

/* ---------- Gallery ---------- */

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

.gallery-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
    cursor: pointer;
    text-align: left;
    color: inherit;
    font: inherit;
    display: flex;
    flex-direction: column;
    transition: border-color 0.15s ease;
}

.gallery-item:hover,
.gallery-item:focus-visible {
    border-color: var(--accent-dim);
}

.gallery-item__caption {
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.img-placeholder {
    aspect-ratio: 4 / 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.75rem;
    text-align: center;
    background:
        repeating-linear-gradient(45deg, var(--surface-2) 0 10px, var(--bg-alt) 10px 20px);
    border-bottom: 1px dashed var(--border);
}

.img-placeholder__icon {
    color: var(--accent-dim);
    font-size: 1.4rem;
}

.img-placeholder__filename {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent);
    word-break: break-all;
}

.img-placeholder__alt {
    font-size: 0.72rem;
    color: var(--text-dim);
}

/* ---------- Build log timeline ---------- */

.timeline {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
}

.timeline::before {
    content: "";
    position: absolute;
    top: 0.4rem;
    bottom: 0.4rem;
    left: 7px;
    width: 2px;
    background: var(--border);
}

.timeline__entry {
    position: relative;
    padding-left: 2.25rem;
    margin-bottom: 2rem;
}

.timeline__node {
    position: absolute;
    left: 0;
    top: 0.4rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.timeline__card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.timeline__date {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 0.4rem;
}

.timeline__title {
    margin: 0 0 0.75rem;
    font-size: 1.15rem;
}

.timeline__photos {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
    margin-bottom: 0.9rem;
}

.timeline__photos .img-placeholder {
    border-radius: 6px;
    border-bottom: none;
    border: 1px dashed var(--border);
}

.timeline__body :is(p, ul) {
    margin: 0 0 0.85rem;
    color: var(--text-dim);
}

.timeline__body p:last-child {
    margin-bottom: 0;
}

.timeline__body strong {
    color: var(--text);
}

.timeline__empty {
    color: var(--text-dim);
}

/* ---------- Lightbox ---------- */

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(4, 6, 10, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.lightbox[hidden] {
    display: none;
}

.lightbox__content {
    max-width: 640px;
    width: 100%;
    margin: 0;
}

.lightbox__media .img-placeholder {
    aspect-ratio: 4 / 3;
    border-radius: var(--radius);
    border: 1px dashed var(--border);
}

.lightbox__media img {
    border-radius: var(--radius);
    width: 100%;
}

.lightbox__caption {
    text-align: center;
    color: var(--text-dim);
    margin-top: 0.75rem;
}

.lightbox__close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
}

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

.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.25rem;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.site-footer__inner {
    max-width: var(--container-width);
    margin: 0 auto;
}

.site-footer__meta {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ---------- Breakpoints ---------- */

@media (min-width: 640px) {
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero__actions {
        flex-direction: row;
        justify-content: center;
    }

    .button {
        width: auto;
    }
}

@media (min-width: 860px) {
    .spec-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .primary-nav {
        display: block;
    }

    .nav-toggle {
        display: none;
    }

    .hero {
        padding: 6rem 1.25rem 4.5rem;
    }

    .hero__title {
        font-size: 3.5rem;
    }

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

    .gallery-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .timeline__entry {
        padding-left: 2.75rem;
    }
}