/* =========================================================
   lunge.dev — Art-Deco Technology Research Institute
   Palette: Honeyed Neutral with Metallic Accents
   ========================================================= */

:root {
    --obsidian-loam: #1C1A17;
    --burnished-ecru: #2E2A22;
    --deco-brass: #C9A84C;
    --honeyed-sand: #D4B896;
    --cream-nacre: #F0E6D2;
    --oxidized-copper: #6B8F71;
    --carbon-veil: #0F0E0C;

    --font-primary: 'Josefin Sans', sans-serif;
    --font-secondary: 'DM Sans', sans-serif;

    --ease-controlled: cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--obsidian-loam);
    color: var(--honeyed-sand);
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: 17px;
    line-height: 1.65;
    overflow-x: hidden;
}

/* =========================================================
   Progress Bar
   ========================================================= */

#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0%;
    background: var(--deco-brass);
    z-index: 9999;
    transition: none;
}

/* =========================================================
   Section Base
   ========================================================= */

.section {
    position: relative;
    width: 100%;
}

/* =========================================================
   Typography
   ========================================================= */

.section-heading {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--deco-brass);
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.sub-heading {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: clamp(1.2rem, 3vw, 2rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--deco-brass);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

p {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: clamp(16px, 1.8vw, 18px);
    line-height: 1.65;
    color: var(--honeyed-sand);
    margin-bottom: 1.2rem;
}

/* =========================================================
   Section 1: The Threshold
   ========================================================= */

.section-threshold {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--obsidian-loam);
    overflow: hidden;
}

.threshold-line {
    position: absolute;
    left: calc(50% - 8%);
    top: 0;
    width: 1px;
    height: 100%;
    background: var(--deco-brass);
    opacity: 0;
    animation: pulse-line 2s var(--ease-controlled) 0.3s forwards;
}

@keyframes pulse-line {
    0% {
        opacity: 0;
        transform: scaleY(0);
        transform-origin: top;
    }
    50% {
        opacity: 0.8;
        transform: scaleY(1);
        transform-origin: top;
    }
    100% {
        opacity: 0.25;
        transform: scaleY(1);
        transform-origin: top;
    }
}

.threshold-content {
    width: 40%;
    margin-left: -8%;
    text-align: center;
    position: relative;
    z-index: 2;
}

.domain-title {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: clamp(3rem, 8vw, 7rem);
    letter-spacing: 0.25em;
    text-transform: lowercase;
    color: var(--deco-brass);
    line-height: 1;
    margin-bottom: 1.5rem;
}

.letter {
    display: inline-block;
    opacity: 0;
    transition: opacity 0.6s var(--ease-controlled);
}

.letter.visible {
    opacity: 1;
}

.threshold-tagline {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: clamp(14px, 1.5vw, 18px);
    letter-spacing: 0.08em;
    color: var(--honeyed-sand);
    opacity: 0;
    transition: opacity 1s var(--ease-controlled);
}

.threshold-tagline.visible {
    opacity: 0.7;
}

/* Monumental watermark sunburst */
.sunburst-watermark {
    position: absolute;
    width: 800px;
    height: 800px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--deco-brass);
    opacity: 0.12;
    pointer-events: none;
    z-index: 1;
}

/* =========================================================
   Section 2: The Chamber
   ========================================================= */

.section-chamber {
    min-height: 150vh;
    background-color: var(--burnished-ecru);
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    position: relative;
    padding: 8vh 0;
}

.chamber-sidebar {
    width: 5%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 10vh;
    gap: 0;
    overflow: hidden;
}

.chamber-sidebar-left {
    transform: translateX(-20px);
    opacity: 0;
    transition: transform 0.8s var(--ease-controlled), opacity 0.8s var(--ease-controlled);
}

.chamber-sidebar-left.visible {
    transform: translateX(0);
    opacity: 1;
}

.chamber-sidebar-right {
    transform: translateX(20px);
    opacity: 0;
    transition: transform 0.8s var(--ease-controlled), opacity 0.8s var(--ease-controlled);
}

.chamber-sidebar-right.visible {
    transform: translateX(0);
    opacity: 1;
}

.chevron {
    width: 30px;
    height: 24px;
    margin-bottom: 6px;
    background: var(--honeyed-sand);
    opacity: 0.4;
    clip-path: polygon(50% 0%, 100% 50%, 80% 50%, 50% 20%, 20% 50%, 0% 50%);
}

.chamber-content {
    width: 60%;
    margin: 0 auto;
    padding: 4vh 3vw;
    display: flex;
    flex-direction: column;
}

.chamber-image-wrapper {
    width: 100%;
    margin-bottom: 3rem;
    overflow: hidden;
}

.chamber-image {
    width: 100%;
    height: 50vh;
    /* Macro brass texture as CSS gradient — simulates brushed metal */
    background:
        repeating-linear-gradient(
            87deg,
            rgba(201, 168, 76, 0.08) 0px,
            rgba(201, 168, 76, 0.03) 1px,
            transparent 1px,
            transparent 3px
        ),
        repeating-linear-gradient(
            93deg,
            rgba(212, 184, 150, 0.06) 0px,
            rgba(212, 184, 150, 0.02) 1px,
            transparent 1px,
            transparent 4px
        ),
        linear-gradient(
            175deg,
            #8B7335 0%,
            #C9A84C 20%,
            #A68B3A 35%,
            #D4B896 50%,
            #C9A84C 65%,
            #8B7335 80%,
            #6B5A28 100%
        );
    transform: scale(1.0);
    transition: transform 1.2s var(--ease-controlled);
    float: left;
    shape-outside: polygon(0% 0%, 100% 0%, 85% 100%, 0% 100%);
    clip-path: polygon(0% 0%, 100% 0%, 85% 100%, 0% 100%);
}

.chamber-image.scaled {
    transform: scale(1.04);
}

.chamber-text {
    clear: both;
}

.chamber-text .section-heading {
    font-size: clamp(1.8rem, 4vw, 3.5rem);
}

/* =========================================================
   Section Divider (Medium Circuit Sunburst)
   ========================================================= */

.section-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 4vh 0;
    width: 100%;
}

.sunburst-divider {
    width: 200px;
    height: 200px;
    color: var(--deco-brass);
}

.sunburst-divider .trace-line {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset 1.5s var(--ease-controlled);
}

.sunburst-divider.drawn .trace-line {
    stroke-dashoffset: 0;
}

.sunburst-divider .solder-point {
    opacity: 0;
    transition: opacity 0.8s var(--ease-controlled) 0.8s;
}

.sunburst-divider.drawn .solder-point {
    opacity: 1;
}

/* =========================================================
   Section 3: The Atrium
   ========================================================= */

.section-atrium {
    min-height: 200vh;
    background-color: var(--burnished-ecru);
    padding: 8vh 5%;
    position: relative;
}

.atrium-grid {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 2vw;
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
}

.atrium-flank {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 4vh;
    opacity: 0.3;
    transition: opacity 1.2s var(--ease-controlled);
}

.atrium-flank.revealed {
    opacity: 1;
}

.circuit-panel {
    width: 100%;
    max-width: 200px;
    height: auto;
    color: var(--oxidized-copper);
}

.atrium-center {
    padding: 4vh 2vw;
}

.atrium-center .section-heading {
    font-size: clamp(2rem, 5vw, 4.5rem);
    margin-bottom: 2rem;
}

.atrium-center p {
    margin-bottom: 1.5rem;
}

/* Central Sunburst SVG with draw animation */
.sunburst-central {
    width: 100%;
    max-width: 400px;
    height: auto;
    display: block;
    margin: 3rem auto;
    color: var(--deco-brass);
}

.sunburst-central .draw-line {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    transition: stroke-dashoffset 2s var(--ease-controlled);
}

.sunburst-central.drawn .draw-line {
    stroke-dashoffset: 0;
}

.sunburst-central .draw-point {
    opacity: 0;
    transition: opacity 0.6s var(--ease-controlled) 1.2s;
}

.sunburst-central.drawn .draw-point {
    opacity: 1;
}

/* =========================================================
   Section 4: The Apex
   ========================================================= */

.section-apex {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background-color: var(--obsidian-loam);
}

.apex-sunburst {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: conic-gradient(
        from 0deg,
        var(--deco-brass) 0deg 7.5deg,
        var(--burnished-ecru) 7.5deg 15deg,
        var(--deco-brass) 15deg 22.5deg,
        var(--burnished-ecru) 22.5deg 30deg,
        var(--deco-brass) 30deg 37.5deg,
        var(--burnished-ecru) 37.5deg 45deg,
        var(--deco-brass) 45deg 52.5deg,
        var(--burnished-ecru) 52.5deg 60deg,
        var(--deco-brass) 60deg 67.5deg,
        var(--burnished-ecru) 67.5deg 75deg,
        var(--deco-brass) 75deg 82.5deg,
        var(--burnished-ecru) 82.5deg 90deg,
        var(--deco-brass) 90deg 97.5deg,
        var(--burnished-ecru) 97.5deg 105deg,
        var(--deco-brass) 105deg 112.5deg,
        var(--burnished-ecru) 112.5deg 120deg,
        var(--deco-brass) 120deg 127.5deg,
        var(--burnished-ecru) 127.5deg 135deg,
        var(--deco-brass) 135deg 142.5deg,
        var(--burnished-ecru) 142.5deg 150deg,
        var(--deco-brass) 150deg 157.5deg,
        var(--burnished-ecru) 157.5deg 165deg,
        var(--deco-brass) 165deg 172.5deg,
        var(--burnished-ecru) 172.5deg 180deg,
        var(--deco-brass) 180deg 187.5deg,
        var(--burnished-ecru) 187.5deg 195deg,
        var(--deco-brass) 195deg 202.5deg,
        var(--burnished-ecru) 202.5deg 210deg,
        var(--deco-brass) 210deg 217.5deg,
        var(--burnished-ecru) 217.5deg 225deg,
        var(--deco-brass) 225deg 232.5deg,
        var(--burnished-ecru) 232.5deg 240deg,
        var(--deco-brass) 240deg 247.5deg,
        var(--burnished-ecru) 247.5deg 255deg,
        var(--deco-brass) 255deg 262.5deg,
        var(--burnished-ecru) 262.5deg 270deg,
        var(--deco-brass) 270deg 277.5deg,
        var(--burnished-ecru) 277.5deg 285deg,
        var(--deco-brass) 285deg 292.5deg,
        var(--burnished-ecru) 292.5deg 300deg,
        var(--deco-brass) 300deg 307.5deg,
        var(--burnished-ecru) 307.5deg 315deg,
        var(--deco-brass) 315deg 322.5deg,
        var(--burnished-ecru) 322.5deg 330deg,
        var(--deco-brass) 330deg 337.5deg,
        var(--burnished-ecru) 337.5deg 345deg,
        var(--deco-brass) 345deg 352.5deg,
        var(--burnished-ecru) 352.5deg 360deg
    );
    opacity: 0.18;
    z-index: 1;
}

.apex-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 5vw;
}

.apex-statement {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--cream-nacre);
    line-height: 1.2;
    margin-bottom: 2rem;
}

.apex-domain {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    letter-spacing: 0.3em;
    text-transform: lowercase;
    color: var(--deco-brass);
}

/* =========================================================
   Micro sunburst list markers (inline accents)
   ========================================================= */

.atrium-center p::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 0.5em;
    background: var(--deco-brass);
    border-radius: 50%;
    vertical-align: middle;
    opacity: 0.5;
}

.atrium-center .section-heading::before,
.atrium-center .sub-heading::before {
    content: none;
}

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

@media (max-width: 900px) {
    .threshold-content {
        width: 80%;
        margin-left: 0;
    }

    .chamber-sidebar {
        display: none;
    }

    .chamber-content {
        width: 90%;
    }

    .atrium-grid {
        grid-template-columns: 1fr;
        width: 95%;
    }

    .atrium-flank {
        display: none;
    }

    .chamber-image {
        float: none;
        shape-outside: none;
        clip-path: none;
        height: 40vh;
    }

    .sunburst-watermark {
        width: 500px;
        height: 500px;
    }
}

@media (max-width: 600px) {
    .domain-title {
        letter-spacing: 0.12em;
    }

    .section-heading {
        letter-spacing: 0.1em;
    }

    .apex-statement {
        letter-spacing: 0.1em;
    }

    .sunburst-watermark {
        width: 350px;
        height: 350px;
    }
}