/* ============================================================
   concurrent.quest - Styles
   The Concurrent Forest: A computational narrative
   ============================================================ */

/* CSS Custom Properties */
:root {
    --midnight-canopy: #0A1A10;
    --deep-moss: #1B4332;
    --fern-shadow: #2D6A4F;
    --bioluminescent: #3DA37A;
    --firefly-gold: #D4A843;
    --pale-lichen: #D4E7D0;
    --fog-green: #8FB8A0;
    --forest-cream: #E8E4D9;
    --process-amber: #E6943A;
    --deep-canopy: #0B1F14;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--midnight-canopy);
}

body {
    font-family: 'Commissioner', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.72;
    color: var(--pale-lichen);
    background-color: var(--midnight-canopy);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   Canvas Layers
   ============================================================ */

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
}

#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 5;
    pointer-events: none;
}

/* ============================================================
   Floating Data Fragments
   ============================================================ */

#data-fragments {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 15;
    pointer-events: none;
    overflow: hidden;
}

.data-fragment {
    position: absolute;
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    color: var(--bioluminescent);
    opacity: 0;
    white-space: nowrap;
    animation: fragmentFloat 12s linear forwards;
}

@keyframes fragmentFloat {
    0% {
        opacity: 0;
        transform: translateY(0);
    }
    8% {
        opacity: 0.18;
    }
    85% {
        opacity: 0.15;
    }
    100% {
        opacity: 0;
        transform: translateY(-100vh);
    }
}

/* ============================================================
   Guide Lines
   ============================================================ */

#guide-line-container {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 680px;
    height: 100vh;
    z-index: 8;
    pointer-events: none;
}

#guide-lines {
    width: 100%;
    height: 100%;
}

.guide-line {
    stroke: var(--bioluminescent);
    stroke-width: 0.15;
    opacity: 0.4;
    transition: opacity 1s ease;
}

/* ============================================================
   Sections - Common
   ============================================================ */

.section {
    position: relative;
    z-index: 10;
    min-height: 100vh;
}

.thread-column {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-heading {
    font-family: 'Commissioner', sans-serif;
    font-weight: 600;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    letter-spacing: 0.01em;
    color: var(--pale-lichen);
    margin-bottom: 2rem;
    padding-top: 15vh;
}

p {
    margin-bottom: 1.6rem;
}

.code-inline {
    font-family: 'Space Mono', monospace;
    font-size: 0.88rem;
    color: var(--bioluminescent);
    background: rgba(61, 163, 122, 0.1);
    padding: 2px 6px;
    border-radius: 3px;
}

/* ============================================================
   SECTION 1: SPAWN
   ============================================================ */

.section-spawn {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.spawn-content {
    text-align: center;
    position: relative;
}

.spawn-title {
    font-family: 'Commissioner', sans-serif;
    font-weight: 800;
    font-size: clamp(3rem, 7vw, 6rem);
    letter-spacing: -0.02em;
    color: var(--pale-lichen);
    opacity: 0;
    animation: spawnFadeIn 2s ease 0.5s forwards;
    margin-bottom: 2rem;
}

@keyframes spawnFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.spawn-point {
    width: 4px;
    height: 4px;
    background: var(--bioluminescent);
    border-radius: 50%;
    margin: 0 auto;
    position: relative;
    opacity: 0;
    animation: spawnPointAppear 1s ease 0.3s forwards;
}

.spawn-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, rgba(61, 163, 122, 0.4) 0%, transparent 70%);
    border-radius: 50%;
    animation: glowPulse 3s ease-in-out infinite;
}

@keyframes spawnPointAppear {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes glowPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%, -50%) scale(1.5); opacity: 1; }
}

/* Fork animation */
.spawn-fork {
    position: relative;
    height: 60px;
    width: 100px;
    margin: 10px auto 0;
    opacity: 0;
    animation: forkAppear 1s ease 1.8s forwards;
}

@keyframes forkAppear {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fork-point {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--bioluminescent);
    border-radius: 50%;
    top: 0;
}

.fork-line {
    position: absolute;
    width: 1px;
    background: var(--bioluminescent);
    height: 50px;
    top: 4px;
    opacity: 0.5;
}

.fork-point.fork-left {
    left: 20px;
}
.fork-point.fork-right {
    right: 20px;
}
.fork-line.fork-line-left {
    left: 21px;
}
.fork-line.fork-line-right {
    right: 21px;
}

/* Tagline with typewriter effect */
.spawn-tagline {
    font-family: 'Commissioner', sans-serif;
    font-weight: 200;
    font-size: 1.1rem;
    color: var(--fog-green);
    margin-top: 1.5rem;
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid var(--fog-green);
    width: 0;
    margin-left: auto;
    margin-right: auto;
    animation: typewriter 2s steps(22) 2.5s forwards,
               blinkCursor 0.8s step-end infinite 2.5s;
}

@keyframes typewriter {
    from { width: 0; }
    to { width: 22ch; }
}

@keyframes blinkCursor {
    50% { border-color: transparent; }
}

/* ============================================================
   SECTION 2: BRANCH
   ============================================================ */

.section-branch {
    min-height: 200vh;
    padding-top: 40vh;
    padding-bottom: 40vh;
}

.branch-intro {
    margin-bottom: 6rem;
}

.branch-passage {
    margin-top: 6rem;
}

/* ============================================================
   Card Flip System
   ============================================================ */

.card-cluster {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin: 4rem 0;
}

.flip-card {
    width: 320px;
    height: 200px;
    perspective: 1200px;
    cursor: default;
}

.flip-card:nth-child(2) {
    margin-left: 60px;
}

.flip-card:nth-child(3) {
    margin-left: -30px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 800ms cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    overflow: hidden;
}

.flip-card-front {
    background: var(--deep-moss);
    display: flex;
    align-items: center;
    justify-content: center;
}

.flip-card-front canvas {
    width: 100%;
    height: 100%;
}

.flip-card-back {
    background: var(--deep-moss);
    color: var(--forest-cream);
    transform: rotateY(180deg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.flip-card-back h3 {
    font-family: 'Commissioner', sans-serif;
    font-weight: 600;
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    color: var(--bioluminescent);
}

.flip-card-back p {
    font-family: 'Commissioner', sans-serif;
    font-weight: 300;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--forest-cream);
    margin-bottom: 0;
}

/* ============================================================
   SECTION 3: EXECUTE
   ============================================================ */

.section-execute {
    min-height: 200vh;
    padding-top: 40vh;
    padding-bottom: 40vh;
}

/* Hexagonal Process Nodes */
.hex-node-row {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin: 3rem 0;
}

.hex-node {
    width: 24px;
    height: 24px;
    background: var(--midnight-canopy);
    border: 1.5px solid var(--bioluminescent);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    animation: hexPulse 2s ease-in-out infinite;
}

.hex-node:nth-child(2) {
    animation-delay: 0.4s;
}

.hex-node:nth-child(3) {
    animation-delay: 0.8s;
}

@keyframes hexPulse {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.08); opacity: 1; }
}

/* Fork-Join Container */
.fork-join-container {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 24px;
    position: relative;
    z-index: 10;
}

.fork-join-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    transition: grid-template-columns 600ms cubic-bezier(0.4, 0, 0.2, 1),
                gap 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.fork-join-container.forked .fork-join-columns {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

.thread-col {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms ease, transform 600ms ease;
    overflow: hidden;
}

.fork-join-container.forked .thread-col {
    opacity: 1;
    transform: translateY(0);
}

.fork-join-container.forked .thread-col.thread-beta {
    transition-delay: 100ms;
}

.fork-join-container.forked .thread-col.thread-gamma {
    transition-delay: 200ms;
}

.thread-label {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(61, 163, 122, 0.3);
}

.thread-col p {
    font-size: clamp(0.85rem, 1.4vw, 0.95rem);
    line-height: 1.65;
}

/* ============================================================
   SECTION 4: CONVERGE
   ============================================================ */

.section-converge {
    min-height: 200vh;
    padding-top: 40vh;
    padding-bottom: 40vh;
}

/* ============================================================
   SECTION 5: RESOLVE
   ============================================================ */

.section-resolve {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.resolve-content {
    text-align: center;
    position: relative;
}

.resolve-point {
    width: 4px;
    height: 4px;
    background: var(--bioluminescent);
    border-radius: 50%;
    margin: 0 auto 2rem;
    position: relative;
}

.resolve-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, rgba(61, 163, 122, 0.4) 0%, transparent 70%);
    border-radius: 50%;
    animation: glowPulse 3s ease-in-out infinite;
}

.resolve-text {
    font-family: 'Commissioner', sans-serif;
    font-weight: 200;
    font-size: 1.4rem;
    color: var(--fog-green);
    letter-spacing: 0.05em;
    margin-bottom: 3rem;
}

/* Growth Rings */
.growth-rings {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 300px;
    pointer-events: none;
}

.ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    border: 1px solid var(--bioluminescent);
    border-radius: 50%;
    opacity: 0;
}

.resolve-content.visible .ring {
    animation: ringExpand 3s ease-out forwards;
}

.ring-1 { width: 40px; height: 40px; }
.ring-2 { width: 80px; height: 80px; }
.ring-3 { width: 120px; height: 120px; }
.ring-4 { width: 170px; height: 170px; }
.ring-5 { width: 220px; height: 220px; }
.ring-6 { width: 280px; height: 280px; }

.resolve-content.visible .ring-1 { animation-delay: 0ms; }
.resolve-content.visible .ring-2 { animation-delay: 200ms; }
.resolve-content.visible .ring-3 { animation-delay: 400ms; }
.resolve-content.visible .ring-4 { animation-delay: 600ms; }
.resolve-content.visible .ring-5 { animation-delay: 800ms; }
.resolve-content.visible .ring-6 { animation-delay: 1000ms; }

@keyframes ringExpand {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
    }
    30% {
        opacity: var(--ring-opacity, 0.4);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0;
    }
}

.ring-1 { --ring-opacity: 0.40; }
.ring-2 { --ring-opacity: 0.30; }
.ring-3 { --ring-opacity: 0.22; }
.ring-4 { --ring-opacity: 0.16; }
.ring-5 { --ring-opacity: 0.10; }
.ring-6 { --ring-opacity: 0.06; }

/* ============================================================
   Scroll-Linked Fade-In Animations
   ============================================================ */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 960px) {
    .fork-join-container.forked .fork-join-columns {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .thread-col {
        border-left: 2px solid rgba(61, 163, 122, 0.3);
        padding-left: 16px;
    }
}

@media (max-width: 600px) {
    .thread-column {
        padding: 0 16px;
    }

    .flip-card {
        width: 280px;
        height: 180px;
    }

    .flip-card:nth-child(2) {
        margin-left: 0;
    }

    .flip-card:nth-child(3) {
        margin-left: 0;
    }

    #guide-line-container {
        display: none;
    }

    .spawn-tagline {
        font-size: 0.95rem;
    }
}