/* ============================================
   a6c.boo — Crystalline Editorial Design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --deep-canvas: #0f1f15;
    --panel-surface: #1a3328;
    --text-primary: #e2ece4;
    --text-secondary: #7a9e7e;
    --accent-warm: #d4b896;
    --accent-crystal: #88c4a0;
    --hidden-violet: #aa66cc;
    --garnet-spark: #c45c5c;
    --frost-lichen: #c4dcc0;
    --frame-inset: 24px;
    --frame-inset-mobile: 12px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--deep-canvas);
    color: var(--text-primary);
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: 1.05rem;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Custom Selection (Easter Egg) --- */
::selection {
    background: var(--hidden-violet);
    color: var(--deep-canvas);
}

::-moz-selection {
    background: var(--hidden-violet);
    color: var(--deep-canvas);
}

/* --- Cursor Proximity Glow --- */
#cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 20vw;
    height: 20vw;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(136, 196, 160, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* --- Prismatic Light (Conic Gradient) --- */
#prismatic-light {
    position: fixed;
    top: -50vh;
    left: -50vw;
    width: 200vw;
    height: 200vh;
    background: conic-gradient(
        from 0deg at 50% 50%,
        rgba(136, 196, 160, 0.04) 0deg,
        rgba(15, 31, 21, 0) 60deg,
        rgba(170, 102, 204, 0.02) 120deg,
        rgba(15, 31, 21, 0) 180deg,
        rgba(136, 196, 160, 0.03) 240deg,
        rgba(15, 31, 21, 0) 300deg,
        rgba(136, 196, 160, 0.04) 360deg
    );
    z-index: -1;
    pointer-events: none;
    animation: prismaticRotate 90s linear infinite;
    opacity: 0.5;
}

@keyframes prismaticRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* --- HUD Outer Frame --- */
#hud-frame {
    position: fixed;
    top: var(--frame-inset);
    left: var(--frame-inset);
    right: var(--frame-inset);
    bottom: var(--frame-inset);
    pointer-events: none;
    z-index: 1000;
}

#hud-frame-svg {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

#hud-frame-line {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    animation: drawFrame 2s ease-out 0.2s forwards;
}

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

/* HUD frame border color reference: #c4dcc0 at 15% opacity */

/* Frame ornaments */
.frame-ornament {
    position: absolute;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.25em;
    color: var(--frost-lichen);
    opacity: 0.12;
}

.ornament-tl { top: 8px; left: 12px; }
.ornament-tr { top: 8px; right: 12px; }
.ornament-bl { bottom: 8px; left: 12px; }
.ornament-br { bottom: 8px; right: 12px; }

/* --- Side Navigation (Desktop) --- */
#side-nav {
    position: fixed;
    left: calc(var(--frame-inset) + 6px);
    top: 50%;
    transform: translateY(-50%);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

#side-nav .nav-link {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-decoration: none;
    opacity: 0.5;
    transition: opacity 0.3s ease, color 0.3s ease;
    cursor: pointer;
    pointer-events: auto;
}

#side-nav .nav-link:hover {
    opacity: 1;
    color: var(--accent-warm);
}

#side-nav .nav-link.active {
    opacity: 1;
    color: var(--accent-crystal);
}

/* --- Top Navigation (Mobile) --- */
#top-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    background: rgba(15, 31, 21, 0.9);
    backdrop-filter: blur(8px);
    padding: 12px var(--frame-inset-mobile);
    gap: 1rem;
    overflow-x: auto;
    white-space: nowrap;
}

#top-nav a {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.3s ease, color 0.3s ease;
}

#top-nav a:hover {
    opacity: 1;
    color: var(--accent-warm);
}

/* --- Ghost Watermark Letters --- */
.ghost-letter {
    position: fixed;
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: 30vw;
    color: var(--text-primary);
    opacity: 0.03;
    pointer-events: none;
    z-index: 0;
    line-height: 1;
    user-select: none;
}

.ghost-a {
    top: 10vh;
    left: -5vw;
    animation: ghostDrift 200s linear infinite;
}

.ghost-b {
    top: 40vh;
    right: -5vw;
    animation: ghostDrift 240s linear infinite;
    animation-delay: -80s;
}

.ghost-c {
    top: 70vh;
    left: 10vw;
    animation: ghostDrift 180s linear infinite;
    animation-delay: -40s;
}

@keyframes ghostDrift {
    from { transform: translateY(0); }
    to { transform: translateY(-100vh); }
}

/* --- HERO SECTION --- */
#hero {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1;
    overflow: hidden;
}

/* Icosahedron */
#icosahedron-container {
    position: absolute;
    width: clamp(250px, 50vw, 500px);
    height: clamp(250px, 50vw, 500px);
    opacity: 0;
    animation: fadeInIcosahedron 1.2s ease-out 0.4s forwards;
}

@keyframes fadeInIcosahedron {
    to { opacity: 0.4; }
}

#icosahedron {
    width: 100%;
    height: 100%;
    will-change: transform;
    animation: rotateIcosahedron 120s linear infinite;
}

@keyframes rotateIcosahedron {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Hero text */
#hero-text {
    position: relative;
    z-index: 2;
    text-align: center;
}

#letter-sequence {
    display: flex;
    justify-content: center;
    gap: 0.5em;
    margin-bottom: 1rem;
    height: clamp(60px, 12vw, 140px);
    align-items: center;
}

.hero-letter {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: clamp(3rem, 12vw, 10rem);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-primary);
    opacity: 0;
    line-height: 1;
}

#wordmark {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: clamp(2.2rem, 6vw, 5.5rem);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-primary);
    opacity: 0;
    margin-bottom: 1.5rem;
}

#hero-subtitle {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(0.95rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    opacity: 0;
    max-width: 500px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- Crystal Dividers --- */
.crystal-divider {
    width: 100%;
    padding: 2vh 0;
    position: relative;
    z-index: 1;
}

.crystal-divider svg {
    width: 100%;
    height: 20px;
    display: block;
}

/* --- Content Panels --- */
.content-panel {
    position: relative;
    z-index: 2;
    margin: -6vh auto 0;
    padding: 0 var(--frame-inset);
}

.content-panel .panel-inner {
    background: var(--panel-surface);
    border: 1px solid rgba(136, 196, 160, 0.25);
    border-top: 1px solid rgba(136, 196, 160, 0.4);
    padding: clamp(2rem, 4vw, 3.5rem);
    position: relative;
    max-width: 720px;
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, border-color 0.25s ease;
}

.panel-right .panel-inner {
    transform: translateX(40px);
}

.content-panel.visible .panel-inner {
    opacity: 1;
    transform: translateX(0);
}

/* Panel layout: left/right alignment */
.panel-left {
    display: flex;
    justify-content: flex-start;
    padding-left: calc(var(--frame-inset) + 40px);
}

.panel-right {
    display: flex;
    justify-content: flex-end;
    padding-right: calc(var(--frame-inset) + 40px);
}

/* Panel hover effect */
.content-panel .panel-inner:hover {
    border-color: rgba(136, 196, 160, 0.6);
    transform: translateY(-2px);
    transition: opacity 0.6s ease-out, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.25s ease;
}

/* Panel labels */
.panel-label {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    opacity: 0;
    transition: opacity 0.4s ease-out 0.15s;
}

.content-panel.visible .panel-label {
    opacity: 1;
}

/* Panel headings */
.panel-heading {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 600;
    font-size: clamp(1.4rem, 3vw, 2.8rem);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    opacity: 0;
    transition: opacity 0.4s ease-out 0.3s;
}

.content-panel.visible .panel-heading {
    opacity: 1;
}

/* Panel body */
.panel-body {
    opacity: 0;
    transition: opacity 0.4s ease-out 0.45s;
}

.content-panel.visible .panel-body {
    opacity: 1;
}

.panel-body p {
    margin-bottom: 1.2em;
    color: var(--text-primary);
}

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

/* Mono accent text */
.mono-accent {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85em;
    letter-spacing: 0.08em;
    color: var(--accent-crystal);
}

/* Panel accent details */
.panel-accent {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(136, 196, 160, 0.15);
    opacity: 0;
    transition: opacity 0.4s ease-out 0.6s;
}

.content-panel.visible .panel-accent {
    opacity: 1;
}

.panel-accent .mono-accent {
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    color: var(--text-secondary);
}

/* Panel decorative crystals */
.panel-crystal {
    position: absolute;
    width: clamp(80px, 10vw, 130px);
    height: auto;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

.panel-left .panel-crystal {
    right: calc(var(--frame-inset) + 10px);
    top: 50%;
    transform: translateY(-50%);
}

.panel-right .panel-crystal {
    left: calc(var(--frame-inset) + 10px);
    top: 50%;
    transform: translateY(-50%);
}

/* --- Footer --- */
#footer {
    position: relative;
    z-index: 2;
    padding: 8vh var(--frame-inset) 6vh;
    text-align: center;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-crystal {
    width: 40px;
    height: 40px;
    opacity: 0.4;
}

.footer-text {
    font-family: 'Source Serif 4', Georgia, serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

.footer-hex {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    color: var(--text-secondary);
    opacity: 0.2;
}

/* --- Link Hover Effect --- */
a[href] {
    color: var(--accent-warm);
    text-decoration: none;
    position: relative;
}

a[href]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-warm);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease-out;
}

a[href]:hover::after {
    transform: scaleX(1);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    #icosahedron-container { opacity: 0.4; }
    #hud-frame-line { stroke-dashoffset: 0; }
    .hero-letter, #wordmark, #hero-subtitle { opacity: 1; }
    .content-panel .panel-inner { opacity: 1; transform: none; }
    .panel-label, .panel-heading, .panel-body, .panel-accent { opacity: 1; }
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
    :root {
        --frame-inset: 12px;
    }

    #side-nav {
        display: none;
    }

    #top-nav {
        display: flex;
    }

    .ghost-letter {
        font-size: 50vw;
    }

    .content-panel {
        margin: -4vh auto 0;
    }

    .panel-left,
    .panel-right {
        justify-content: center;
        padding-left: var(--frame-inset);
        padding-right: var(--frame-inset);
    }

    .content-panel .panel-inner {
        max-width: 92%;
        width: 92%;
        transform: translateY(20px);
    }

    .panel-right .panel-inner {
        transform: translateY(20px);
    }

    .content-panel.visible .panel-inner {
        transform: translateY(0);
    }

    .panel-crystal {
        display: none;
    }

    #hero {
        padding-top: 50px;
    }

    .ornament-bl, .ornament-br {
        display: none;
    }
}

/* --- Tablet --- */
@media (max-width: 1024px) and (min-width: 769px) {
    .panel-left {
        padding-left: calc(var(--frame-inset) + 50px);
    }

    .panel-right {
        padding-right: calc(var(--frame-inset) + 20px);
    }
}