/* ==========================================
   cbdc.bar — Volcanic Twilight Design System
   ========================================== */

:root {
    --obsidian: #0f0e13;
    --basalt: #1c1a24;
    --liquid-amber: #c47a3a;
    --magma: #e85d26;
    --smoked-honey: #d4a65a;
    --summit-mist: #8b8698;
    --snowfield: #e8e4df;
    --ember-glow: #2a1f18;
}

/* ==========================================
   Reset & Base
   ========================================== */

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

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

body {
    background: var(--obsidian);
    color: var(--snowfield);
    font-family: 'Jost', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    line-height: 1.75;
    overflow-x: hidden;
}

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

.headline {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: clamp(2rem, 5vw, 4rem);
    color: var(--liquid-amber);
    line-height: 1.15;
    margin-bottom: 1.5rem;
    white-space: nowrap;
}

.body-text {
    font-family: 'Jost', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    line-height: 1.75;
    color: var(--summit-mist);
    max-width: 38ch;
}

.body-text--light {
    color: var(--snowfield);
}

.accent-meta {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    color: var(--liquid-amber);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: block;
    margin-bottom: 1rem;
}

.domain-name {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    letter-spacing: 0.3em;
    color: var(--liquid-amber);
    opacity: 0;
    transition: opacity 1.5s ease;
}

.domain-name.visible {
    opacity: 1;
}

.domain-name--inverted {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    letter-spacing: 0.3em;
    color: var(--obsidian);
    opacity: 1;
}

/* ==========================================
   Altitude Markers
   ========================================== */

.altitude-markers {
    position: fixed;
    left: 1.5vw;
    top: 0;
    bottom: 0;
    width: 60px;
    z-index: 100;
    pointer-events: none;
}

.alt-marker {
    position: absolute;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.65rem;
    color: var(--smoked-honey);
    opacity: 0.35;
    letter-spacing: 0.05em;
    transform: rotate(-90deg);
    transform-origin: left center;
    white-space: nowrap;
    transition: opacity 0.6s ease;
}

.alt-marker.active {
    opacity: 0.8;
    color: var(--liquid-amber);
}

/* ==========================================
   Contour Lines
   ========================================== */

.contour-lines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
    opacity: 0.08;
    background:
        repeating-conic-gradient(
            from 0deg at 30% 60%,
            transparent 0deg,
            transparent 358deg,
            var(--summit-mist) 358deg,
            var(--summit-mist) 360deg
        ),
        repeating-conic-gradient(
            from 15deg at 70% 40%,
            transparent 0deg,
            transparent 357deg,
            var(--summit-mist) 357deg,
            var(--summit-mist) 360deg
        );
    transition: transform 0.3s ease-out;
}

/* ==========================================
   Bar Lines
   ========================================== */

.bar-line {
    border: none;
    height: 1px;
    background: var(--liquid-amber);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.bar-line.animate {
    transform: scaleX(1);
}

.bar-line--intro {
    width: 80vw;
    margin: 2rem auto 0;
    display: block;
}

.bar-line--treeline {
    width: 100%;
    margin: clamp(4rem, 8vh, 10rem) 0;
}

.bar-line--ridge {
    width: 38ch;
    max-width: 90vw;
    margin: clamp(4rem, 8vh, 10rem) auto;
}

.bar-line--final {
    width: 60vw;
    margin: 0 auto 2rem;
    background: var(--magma);
    transform: scaleX(0);
    transition: transform 2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.bar-line--final.animate {
    transform: scaleX(1);
}

/* ==========================================
   ZONE 1: Base Camp
   ========================================== */

.zone-basecamp {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    background: var(--obsidian);
}

.basecamp-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chevron-down {
    margin-top: 3rem;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.chevron-down.visible {
    opacity: 0.4;
}

.chevron-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-right: 1.5px solid var(--liquid-amber);
    border-bottom: 1.5px solid var(--liquid-amber);
    transform: rotate(45deg);
    animation: chevronPulse 1.5s ease-in-out 1;
}

@keyframes chevronPulse {
    0% { transform: rotate(45deg) scale(1); }
    50% { transform: rotate(45deg) scale(1.1); }
    100% { transform: rotate(45deg) scale(1); }
}

/* ==========================================
   ZONE 2: Treeline
   ========================================== */

.zone-treeline {
    min-height: 150vh;
    position: relative;
    z-index: 2;
    padding: clamp(4rem, 8vh, 10rem) 0;
    background: linear-gradient(
        to bottom,
        var(--obsidian) 0%,
        var(--ember-glow) 50%,
        var(--obsidian) 100%
    );
}

.treeline-block {
    margin-bottom: clamp(4rem, 8vh, 10rem);
    padding: 0 5vw;
}

.treeline-block--left {
    margin-left: 5vw;
    margin-right: 25vw;
}

.treeline-block--right {
    margin-left: 40vw;
    margin-right: 5vw;
}

.treeline-block--center {
    margin-left: 15vw;
    margin-right: 20vw;
}

/* Photo Strips */
.photo-strip {
    height: 15vh;
    width: 70vw;
    margin-bottom: clamp(4rem, 8vh, 10rem);
    overflow: hidden;
    clip-path: inset(0 15% 0 15%);
    transition: clip-path 1.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.photo-strip.revealed {
    clip-path: inset(0 0 0 0);
}

.photo-strip--right {
    margin-left: auto;
    margin-right: 5vw;
}

.photo-strip--left {
    margin-left: 5vw;
}

.photo-strip-inner {
    width: 100%;
    height: 100%;
    position: relative;
}

#photoStrip1 .photo-strip-inner {
    background: linear-gradient(
        135deg,
        var(--obsidian) 0%,
        var(--basalt) 20%,
        var(--ember-glow) 40%,
        var(--obsidian) 55%,
        var(--basalt) 70%,
        var(--smoked-honey) 85%,
        var(--obsidian) 100%
    );
}

#photoStrip1 .photo-strip-inner::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(15,14,19,0.6), transparent 40%, rgba(15,14,19,0.8));
}

#photoStrip2 .photo-strip-inner {
    background: linear-gradient(
        -15deg,
        var(--basalt) 0%,
        var(--ember-glow) 15%,
        var(--liquid-amber) 25%,
        var(--obsidian) 40%,
        var(--basalt) 55%,
        var(--smoked-honey) 70%,
        var(--obsidian) 85%,
        var(--basalt) 100%
    );
}

#photoStrip2 .photo-strip-inner::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(15,14,19,0.6), transparent 40%, rgba(15,14,19,0.8));
}

/* ==========================================
   Scroll Reveal
   ========================================== */

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

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

.scroll-reveal-line {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.scroll-reveal-out {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

/* ==========================================
   ZONE 3: The Ridge
   ========================================== */

.zone-ridge {
    min-height: 150vh;
    position: relative;
    z-index: 2;
    padding: clamp(6rem, 12vh, 14rem) 5vw;
    background: var(--basalt);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.zone-ridge::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30vh;
    background: linear-gradient(to bottom, var(--obsidian), transparent);
    pointer-events: none;
}

.zone-ridge::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 30vh;
    background: linear-gradient(to top, var(--obsidian), transparent);
    pointer-events: none;
}

.ridge-column {
    max-width: 38ch;
    position: relative;
    z-index: 3;
}

.ridge-text {
    font-family: 'Jost', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    line-height: 1.75;
    color: var(--snowfield);
    text-indent: 2em;
    margin-bottom: 0;
}

.ridge-text + .ridge-text {
    margin-top: 0;
}

/* Breath Particles */
.breath-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 2;
    overflow: hidden;
}

.breath-particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--snowfield);
    border-radius: 50%;
    opacity: 0;
    animation: breathDrift linear infinite;
}

@keyframes breathDrift {
    0% {
        opacity: 0;
        transform: translateY(0) translateX(0);
    }
    15% {
        opacity: 0.3;
    }
    85% {
        opacity: 0.15;
    }
    100% {
        opacity: 0;
        transform: translateY(-120px) translateX(20px);
    }
}

/* ==========================================
   ZONE 4: The Summit
   ========================================== */

.zone-summit {
    height: 100vh;
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--obsidian);
    overflow: hidden;
}

.summit-image {
    width: 20vw;
    height: 20vh;
    margin: 0;
    will-change: transform;
    transition: transform 0.05s linear;
    position: relative;
    overflow: hidden;
    border: none;
}

.summit-image-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(
        180deg,
        var(--obsidian) 0%,
        var(--basalt) 10%,
        var(--ember-glow) 25%,
        var(--liquid-amber) 35%,
        var(--smoked-honey) 42%,
        var(--snowfield) 50%,
        var(--smoked-honey) 58%,
        var(--liquid-amber) 65%,
        var(--ember-glow) 78%,
        var(--basalt) 90%,
        var(--obsidian) 100%
    );
    position: relative;
}

.summit-image-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 50% 40%, transparent 20%, var(--obsidian) 70%),
        linear-gradient(to bottom, rgba(15,14,19,0.4), transparent 30%, transparent 70%, rgba(15,14,19,0.4));
    mix-blend-mode: multiply;
}

.summit-image-inner::after {
    content: '';
    position: absolute;
    bottom: 30%;
    left: 10%;
    right: 10%;
    height: 40%;
    background: linear-gradient(
        170deg,
        transparent 0%,
        transparent 30%,
        var(--basalt) 35%,
        var(--ember-glow) 45%,
        var(--basalt) 55%,
        transparent 60%,
        transparent 100%
    );
    clip-path: polygon(20% 100%, 50% 0%, 80% 100%);
    opacity: 0.8;
}

/* ==========================================
   ZONE 5: The Descent
   ========================================== */

.zone-descent {
    min-height: 100vh;
    position: relative;
    z-index: 2;
    padding: clamp(6rem, 12vh, 14rem) 5vw;
    background: linear-gradient(
        to bottom,
        var(--obsidian) 0%,
        var(--basalt) 30%,
        var(--snowfield) 75%,
        var(--snowfield) 100%
    );
}

.descent-block {
    margin-bottom: clamp(4rem, 8vh, 10rem);
}

.descent-block--left {
    margin-left: 8vw;
    margin-right: 35vw;
}

.descent-block--right {
    margin-left: 30vw;
    margin-right: 10vw;
}

.descent-final {
    text-align: center;
    padding: clamp(4rem, 10vh, 12rem) 0;
}

.accent-meta--final {
    color: var(--obsidian);
    opacity: 0.5;
    margin-top: 1rem;
}

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

@media (max-width: 768px) {
    .altitude-markers {
        display: none;
    }

    .treeline-block--left,
    .treeline-block--right,
    .treeline-block--center {
        margin-left: 5vw;
        margin-right: 5vw;
    }

    .photo-strip {
        width: 90vw;
    }

    .photo-strip--right,
    .photo-strip--left {
        margin-left: 5vw;
        margin-right: 5vw;
    }

    .descent-block--left,
    .descent-block--right {
        margin-left: 5vw;
        margin-right: 5vw;
    }

    .headline {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
        white-space: normal;
    }
}

@media (max-width: 480px) {
    .ridge-column {
        max-width: 90vw;
    }

    .summit-image {
        width: 40vw;
        height: 25vh;
    }
}