/* ============================================================
   a6c.dev - Isometric Developer Identity
   ============================================================ */

/* --- Custom Properties --- */
:root {
    --deep-ground: #0d1117;
    --mid-ground: #161b22;
    --warm-glow: #e3a857;
    --cool-steel: #4a6a8a;
    --text-primary: #c4b69c;
    --text-secondary: #7a8a7a;
    --verdigris: #3fb89f;
    --shadow: #06090d;

    --iso-angle: 30deg;
    --iso-skew-x: skewX(-30deg);
    --iso-skew-y: skewY(30deg);

    --font-heading: 'Space Mono', monospace;
    --font-body: 'Libre Baskerville', serif;
    --font-code: 'Fira Code', monospace;
    --font-numeral: 'Chakra Petch', sans-serif;

    --cube-unit: 60px;
    --grid-gap: 2rem;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--deep-ground);
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--text-primary);
    background-color: var(--deep-ground);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Engineering Grid Background --- */
#engineering-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    transition: opacity 800ms ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='52'%3E%3Ccircle cx='10' cy='10' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='30' cy='10' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='50' cy='10' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='20' cy='26' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='40' cy='26' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='10' cy='42' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='30' cy='42' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3Ccircle cx='50' cy='42' r='1.2' fill='%234a6a8a' opacity='0.08'/%3E%3C/svg%3E");
    background-repeat: repeat;
}

#engineering-grid.visible {
    opacity: 1;
}

/* --- Navigation Cube --- */
#nav-cube {
    position: fixed;
    top: 2rem;
    left: 2rem;
    z-index: 1000;
    cursor: pointer;
    width: 40px;
    height: 40px;
}

.nav-cube-faces {
    position: relative;
    width: 40px;
    height: 40px;
    transform-style: preserve-3d;
    transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

#nav-cube:hover .nav-cube-faces {
    transform: rotateY(45deg) rotateX(-15deg);
}

#nav-cube.active .nav-cube-faces {
    transform: rotateY(90deg) rotateX(-30deg);
}

.nav-cube-face {
    position: absolute;
    width: 28px;
    height: 28px;
}

.nav-cube-top {
    background: var(--warm-glow);
    transform: translateY(-6px) translateX(6px) skewX(-30deg) scaleY(0.864);
    top: 0;
    left: 0;
}

.nav-cube-left {
    background: #b8872e;
    transform: skewY(30deg);
    top: 8px;
    left: 0;
    height: 24px;
    width: 20px;
}

.nav-cube-right {
    background: #8a6520;
    transform: skewY(-30deg);
    top: -4px;
    left: 20px;
    height: 24px;
    width: 20px;
}

.nav-menu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    gap: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms ease;
    background: var(--mid-ground);
    border: 1px solid var(--cool-steel);
    padding: 0.5rem 0;
    min-width: 160px;
    transform: translate(-10px, 10px);
}

#nav-cube.active .nav-menu {
    opacity: 1;
    pointer-events: all;
}

.nav-link {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1.2rem;
    transition: color 200ms ease, background-color 200ms ease;
    display: block;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--verdigris);
    background-color: rgba(63, 184, 159, 0.08);
}

/* --- Hero Zone --- */
.hero-zone {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 1;
}

/* --- Isometric Cityscape --- */
.hero-cityscape {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -60%);
    width: 500px;
    height: 400px;
    transform-style: preserve-3d;
}

/* --- Cube Base Styles --- */
.cube {
    position: relative;
    display: inline-block;
    transform-style: preserve-3d;
}

.cube--lg {
    position: absolute;
    width: var(--cube-unit);
    transform: translateY(100px) scale(0);
    opacity: 0;
    transition: transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1), opacity 400ms ease;
}

.cube--lg.risen {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.cube--lg .cube-face {
    position: absolute;
}

.cube--lg .cube-top {
    width: var(--cube-unit);
    height: calc(var(--cube-unit) * 0.577);
    background: var(--cube-color-top, var(--cool-steel));
    transform: translateX(0px) translateY(0px) skewX(-30deg) scaleY(0.864);
    left: 15px;
    top: 0;
}

.cube--lg .cube-left {
    width: calc(var(--cube-unit) * 0.5);
    height: var(--cube-h, 100px);
    background: var(--cube-color-left, var(--mid-ground));
    transform: skewY(30deg);
    left: 0;
    top: 15px;
}

.cube--lg .cube-right {
    width: calc(var(--cube-unit) * 0.5);
    height: var(--cube-h, 100px);
    background: var(--cube-color-right, var(--deep-ground));
    transform: skewY(-30deg);
    left: 30px;
    top: -2px;
}

/* Position cubes in grid pattern */
.cube--lg[data-delay="0"] { left: 40px; top: 180px; }
.cube--lg[data-delay="1"] { left: 120px; top: 140px; }
.cube--lg[data-delay="2"] { left: 200px; top: 170px; }
.cube--lg[data-delay="3"] { left: 280px; top: 150px; }
.cube--lg[data-delay="4"] { left: 80px; top: 210px; }
.cube--lg[data-delay="5"] { left: 160px; top: 180px; }
.cube--lg[data-delay="6"] { left: 240px; top: 160px; }
.cube--lg[data-delay="7"] { left: 320px; top: 190px; }
.cube--lg[data-delay="8"] { left: 60px; top: 250px; }
.cube--lg[data-delay="9"] { left: 140px; top: 220px; }
.cube--lg[data-delay="10"] { left: 220px; top: 200px; }
.cube--lg[data-delay="11"] { left: 300px; top: 170px; }

/* Small Cubes (list bullets) */
.cube--sm {
    width: 10px;
    height: 10px;
    display: inline-block;
    margin-right: 0.5rem;
    position: relative;
    vertical-align: middle;
    flex-shrink: 0;
}

.cube--sm .cube-top {
    position: absolute;
    width: 8px;
    height: 5px;
    background: var(--warm-glow);
    transform: skewX(-30deg) scaleY(0.864);
    top: 0;
    left: 2px;
}

.cube--sm .cube-left {
    position: absolute;
    width: 5px;
    height: 7px;
    background: #b8872e;
    transform: skewY(30deg);
    top: 3px;
    left: 0;
}

.cube--sm .cube-right {
    position: absolute;
    width: 5px;
    height: 7px;
    background: #8a6520;
    transform: skewY(-30deg);
    top: 1px;
    left: 5px;
}

/* --- Hero Content --- */
.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(4rem, 12vw, 10rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--warm-glow);
    line-height: 1;
    margin-bottom: 1rem;
    text-shadow: 4px 4px 0 var(--shadow), 8px 8px 0 rgba(6, 9, 13, 0.5);
}

.hero-char {
    display: inline-block;
    opacity: 0;
    transform: translateX(-30px) translateY(-20px);
    transition: opacity 400ms ease, transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hero-char.visible {
    opacity: 1;
    transform: translateX(0) translateY(0);
}

.hero-char--numeral {
    font-family: var(--font-numeral);
    font-weight: 600;
    animation: none;
}

.hero-char--numeral.visible {
    animation: numeralPulse 3s ease-in-out infinite;
}

@keyframes numeralPulse {
    0%, 100% { text-shadow: 4px 4px 0 var(--shadow), 8px 8px 0 rgba(6, 9, 13, 0.5); }
    50% { text-shadow: 4px 4px 0 var(--shadow), 8px 8px 0 rgba(6, 9, 13, 0.5), 0 0 20px rgba(227, 168, 87, 0.4), 0 0 40px rgba(227, 168, 87, 0.2); }
}

/* --- Hero Subtitle --- */
.hero-subtitle {
    font-family: var(--font-code);
    font-size: clamp(0.875rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.subtitle-prompt {
    color: var(--verdigris);
}

.subtitle-cursor {
    animation: blink 800ms step-end infinite;
    color: var(--warm-glow);
}

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

/* --- Numeronym Decoder --- */
.numeronym-decoder {
    position: relative;
    z-index: 10;
    text-align: center;
    margin-top: 3rem;
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    opacity: 0;
    transition: opacity 600ms ease;
}

.numeronym-decoder.visible {
    opacity: 1;
}

.decoder-prefix, .decoder-suffix {
    color: var(--warm-glow);
    font-weight: 700;
}

.decoder-expansion {
    color: var(--verdigris);
    font-family: var(--font-code);
    font-size: 0.875em;
    transition: opacity 150ms ease;
    display: inline-block;
    min-width: 5ch;
}

.decoder-bracket {
    color: var(--cool-steel);
    font-weight: 400;
    margin-left: 1rem;
}

.decoder-count {
    font-family: var(--font-numeral);
    font-weight: 600;
    color: var(--warm-glow);
    animation: numeralPulse 3s ease-in-out infinite;
}

/* --- Connector Lines --- */
.connector-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.connector-line {
    stroke: var(--warm-glow);
    stroke-width: 1;
    fill: none;
    filter: url(#glow);
    opacity: 0.6;
}

.connector-line.drawn {
    animation: drawLine 1200ms ease forwards;
}

@keyframes drawLine {
    to { stroke-dashoffset: 0; }
}

/* --- Content Rooms --- */
.content-rooms {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem 6rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.content-room {
    position: relative;
    perspective: 1000px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 600ms ease, transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.content-room.visible {
    opacity: 1;
    transform: translateY(0);
}

.content-room--offset {
    margin-top: 3rem;
}

.room-inner {
    position: relative;
    width: 100%;
    min-height: 320px;
    transition: transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
}

.content-room:hover .room-inner {
    transform: rotateY(180deg);
}

.room-front, .room-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    padding: 2rem;
    border: 1px solid var(--cool-steel);
    background: var(--mid-ground);
}

.room-front {
    /* Isometric border effect via pseudo-element */
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
}

.room-back {
    transform: rotateY(180deg);
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='52'%3E%3Ccircle cx='10' cy='10' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='30' cy='10' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='50' cy='10' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='20' cy='26' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='40' cy='26' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='10' cy='42' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='30' cy='42' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3Ccircle cx='50' cy='42' r='1.2' fill='%234a6a8a' opacity='0.15'/%3E%3C/svg%3E");
    background-color: var(--deep-ground);
}

/* --- Room Annotations --- */
.room-annotation {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 400ms ease 200ms, transform 400ms ease 200ms;
}

.content-room.visible .room-annotation {
    opacity: 1;
    transform: translateX(0);
}

.annotation-line {
    display: inline-block;
    width: 24px;
    height: 1px;
    background: var(--cool-steel);
    position: relative;
}

.annotation-line::after {
    content: '';
    position: absolute;
    right: -3px;
    top: -3px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    border: 1px solid var(--cool-steel);
    background: var(--deep-ground);
}

.annotation-label {
    font-family: var(--font-code);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

/* --- Room Content --- */
.room-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.5rem, 4vw, 2rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--warm-glow);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.room-body {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.room-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.room-list li {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}

.list-text {
    font-family: var(--font-body);
    color: var(--text-primary);
}

.list-meta {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.room-quote {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--text-primary);
    padding: 1rem;
    border-left: 2px solid var(--warm-glow);
    background: rgba(227, 168, 87, 0.05);
    font-size: 0.9rem;
    line-height: 1.7;
}

.quote-mark {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--warm-glow);
    opacity: 0.5;
    vertical-align: -0.1em;
}

.room-code {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--verdigris);
    background: var(--deep-ground);
    padding: 1rem;
    border: 1px solid var(--cool-steel);
    overflow-x: auto;
    line-height: 1.6;
}

.room-link {
    font-family: var(--font-code);
    color: var(--verdigris);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 200ms ease;
}

.room-link:hover {
    color: var(--warm-glow);
}

/* --- Room Blueprint (Back) --- */
.room-blueprint {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding: 1rem 0;
}

.blueprint-label {
    font-family: var(--font-code);
    font-size: 0.65rem;
    color: var(--cool-steel);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 0.5rem;
}

.blueprint-label:first-child {
    margin-top: 0;
}

.blueprint-item {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--text-primary);
}

.blueprint-numeral {
    font-family: var(--font-numeral);
    font-weight: 600;
    color: var(--warm-glow);
    font-size: 1.1rem;
}

/* --- Footer Plane --- */
.footer-plane {
    position: relative;
    z-index: 1;
    padding: 6rem 2rem 4rem;
    background: var(--deep-ground);
    overflow: hidden;
}

.footer-grid {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3E%3Ccircle cx='20' cy='20' r='1' fill='%234a6a8a' opacity='0.12'/%3E%3C/svg%3E");
    background-repeat: repeat;
    opacity: 0.6;
}

.footer-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-label .annotation-line {
    width: 40px;
}

.footer-text {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-secondary);
}

.footer-domain {
    color: var(--warm-glow);
}

.footer-separator {
    color: var(--cool-steel);
}

.footer-year {
    font-family: var(--font-numeral);
    font-weight: 600;
    color: var(--text-secondary);
}

.footer-decoder {
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-prefix, .footer-suffix {
    color: var(--warm-glow);
}

.footer-cycling {
    color: var(--verdigris);
    display: inline-block;
    min-width: 6ch;
}

/* --- Shadow Planes for Hero Cubes --- */
.cube--lg::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 10px;
    width: calc(var(--cube-unit) * 0.8);
    height: 20px;
    background: var(--shadow);
    opacity: 0.4;
    transform: skewX(-30deg);
    z-index: -1;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .content-rooms {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .content-room--offset {
        margin-top: 1.5rem;
    }

    .hero-cityscape {
        transform: translate(-50%, -60%) scale(0.7);
    }
}

@media (max-width: 600px) {
    .content-rooms {
        grid-template-columns: 1fr;
        padding: 2rem 1rem 4rem;
    }

    .content-room--offset {
        margin-top: 0;
    }

    .hero-cityscape {
        transform: translate(-50%, -60%) scale(0.5);
    }

    #nav-cube {
        top: 1rem;
        left: 1rem;
    }

    .room-front, .room-back {
        padding: 1.5rem;
    }

    .room-inner {
        min-height: 280px;
    }
}

/* --- Utility: scroll-triggered visibility --- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease, transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}