/* ── Custom Properties ── */
:root {
    --bg: #0e0e10;
    --bg-card: #1a1a1f;
    --bg-card-hover: #22222a;
    --border: #2a2a35;
    --border-hover: #3a3a48;
    --text: #e4e4e7;
    --text-muted: #8a8a96;
    --accent: #6ee7b7;
    --accent-muted: rgba(110, 231, 183, 0.12);
    --radius: 12px;
    --radius-sm: 6px;
    --font: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1100px;
    --transition: 0.2s ease;
    --flip-duration: 0.75s;
}

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

/* ── Base ── */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    /* overflow hidden prevents scrollbar flash during flip */
    overflow: hidden;
    height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

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

/* ── 3-D Flip Scene ── */
.scene {
    position: fixed;
    inset: 0;
    perspective: 1800px;
}

.flip-container {
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform var(--flip-duration) cubic-bezier(0.4, 0, 0.2, 1);
}

.flip-container.is-flipped {
    transform: rotateY(180deg);
}

.face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: var(--bg);
    overflow-y: auto;
}

.face--back {
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
}

.face--back main {
    flex: 1;
}

/* ── Front face: hero stage ── */
.hero-stage {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 5rem); /* leave room for footer */
    padding: 2rem 1.5rem;
}

.hero-card {
    width: min(60%, 820px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.55);
    transition: box-shadow var(--transition), border-color var(--transition);
}

.hero-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.65);
}

.hero-card__image {
    width: 100%;
    aspect-ratio: 1200 / 630;
    overflow: hidden;
    background: #15151a;
    border-bottom: 1px solid var(--border);
}

.hero-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-card__body {
    padding: 1.25rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hero-card__url {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    text-transform: lowercase;
    letter-spacing: 0.02em;
}

.hero-card__title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.hero-card__desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.hero-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.hero-card__tag {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    background: var(--accent-muted);
    color: var(--accent);
    border-radius: var(--radius-sm);
    letter-spacing: 0.02em;
}

.hero-card__tag--link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition);
    text-decoration: none;
}

.hero-card__tag--link:hover,
.hero-card__tag--link:focus-visible {
    background: rgba(110, 231, 183, 0.22);
    box-shadow: 0 0 0 2px var(--accent);
    outline: none;
}

.tag-arrow {
    transition: transform var(--transition);
}

.hero-card__tag--link:hover .tag-arrow,
.hero-card__tag--link:focus-visible .tag-arrow {
    transform: translateX(3px);
}

.face-footer {
    text-align: center;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ── Back face: header ── */
header {
    padding: 1.5rem 0 1rem;
    text-align: left;
}

/* Small muted back-link button */
.back-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 400;
    padding: 0;
    transition: color var(--transition);
}

.back-home-btn:hover,
.back-home-btn:focus-visible {
    color: var(--text);
    outline: none;
}

.back-home-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.back-arrow {
    font-size: 0.85rem;
    transition: transform var(--transition);
}

.back-home-btn:hover .back-arrow,
.back-home-btn:focus-visible .back-arrow {
    transform: translateX(-3px);
}

.back-home-label {
    letter-spacing: 0.01em;
}

/* Big prominent path title */
.projects-path {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-top: 0.2rem;
    line-height: 1.1;
}

.path-slash {
    color: var(--text-muted);
    font-weight: 300;
}

.path-cursor {
    color: var(--accent);
    font-weight: 300;
}

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

.slash {
    color: var(--text-muted);
    font-weight: 300;
}

/* ── Project Grid (back face) ── */
main {
    flex: 1;
    padding: 2rem 0 4rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* ── OG-Style Card ── */
.og-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    cursor: pointer;
}

.og-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    border-color: var(--border-hover);
}

.og-card:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    border-color: var(--border-hover);
}

.og-card:hover .og-card__image img,
.og-card:focus-visible .og-card__image img {
    transform: scale(1.03);
}

/* Card image area */
.og-card__image {
    width: 100%;
    aspect-ratio: 1200 / 630;
    overflow: hidden;
    background: #15151a;
    border-bottom: 1px solid var(--border);
}

.og-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

/* Card body */
.og-card__body {
    padding: 1rem 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.og-card__url {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    text-transform: lowercase;
    letter-spacing: 0.02em;
}

.og-card__title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text);
}

.og-card__desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Tags */
.og-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: auto;
    padding-top: 0.5rem;
}

.og-card__tag {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    background: var(--accent-muted);
    color: var(--accent);
    border-radius: var(--radius-sm);
    letter-spacing: 0.02em;
}

/* ── No-script fallback ── */
.noscript-message {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 0;
}

/* ── Footer (back face) ── */
footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

footer p {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ── Responsive ── */
@media (max-width: 700px) {
    .hero-card {
        width: 100%;
    }

    .hero-card__title {
        font-size: 1.3rem;
    }

    header {
        padding: 1rem 0 0.5rem;
    }

    .projects-path {
        font-size: 1.8rem;
    }

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

    main {
        padding: 1.5rem 0 3rem;
    }
}

/* ── Reduced-motion: disable 3-D flip, use fade instead ── */
@media (prefers-reduced-motion: reduce) {
    .flip-container {
        transition: none;
    }

    .face {
        transition: opacity 0.3s ease;
    }

    .face--back {
        transform: none;
        opacity: 0;
        pointer-events: none;
    }

    .flip-container.is-flipped .face--front {
        opacity: 0;
        pointer-events: none;
    }

    .flip-container.is-flipped .face--back {
        opacity: 1;
        pointer-events: auto;
    }
}