/* =====================================================
   hil.st  -- text as terrain
   Palette (from DESIGN.md):
   #f8f4ee Paper Slope (bg primary)
   #e8e4de Altitude Gray (summit bg)
   #f0ece2 Meadow (valley bg)
   #1a1a2e Basalt (text primary)
   #4a4a5e Slate (text secondary)
   #8a8a98 Limestone (text muted)
   #d44030 Peak Red (accent primary)
   #e8883c Trail Orange (accent secondary)
   #2a8a7a Valley Teal (accent tertiary)
   #c8c0b0 Elevation Line (contour svg)
   #2a2a3e Hill Shadow (shadow)
   ===================================================== */

:root {
    --paper-slope: #f8f4ee;
    --altitude-gray: #e8e4de;
    --meadow: #f0ece2;
    --basalt: #1a1a2e;
    --slate: #4a4a5e;
    --limestone: #8a8a98;
    --peak-red: #d44030;
    --trail-orange: #e8883c;
    --valley-teal: #2a8a7a;
    --elevation-line: #c8c0b0;
    --hill-shadow: #2a2a3e;
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Work Sans', system-ui, sans-serif;
    --font-accent: 'Syne', system-ui, sans-serif;
    --font-mono: 'Space Mono', ui-monospace, monospace;
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--paper-slope);
    color: var(--basalt);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body {
    position: relative;
    min-height: 100vh;
}

/* ---------- Background contours (fixed) ---------- */
.contour-bg {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    transition: opacity 1.5s ease-out;
}
.contour-bg.is-ready { opacity: 1; }
.contour-bg .contour-group { opacity: 0.06; }
.contour-bg .contour-labels text { opacity: 0.18; letter-spacing: 0.08em; }

.horizon-grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}
.horizon-line {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--y);
    height: 1px;
    background: var(--elevation-line);
    opacity: 0.14;
    transform-origin: 50% 50%;
}

/* ---------- Altitude marker rail ---------- */
.altitude-rail {
    position: fixed;
    top: 0;
    bottom: 0;
    left: clamp(12px, 2vw, 32px);
    width: 28px;
    z-index: 4;
    pointer-events: none;
}
.altitude-marker {
    position: absolute;
    left: 0;
    top: var(--at);
    width: 22px;
    height: 22px;
    transform: translateY(-50%);
    opacity: 0.5;
}
.altitude-marker::before {
    content: "";
    position: absolute;
    left: 10px;
    top: 0;
    width: 1px;
    height: 22px;
    background: var(--trail-orange);
}
.altitude-marker::after {
    content: "";
    position: absolute;
    left: 11px;
    top: 0;
    width: 0;
    height: 0;
    border-left: 9px solid var(--trail-orange);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
}
.altitude-marker[data-elev]::before {
    box-shadow: 0 0 0 0 transparent;
}
.altitude-rail .altitude-marker > span {
    /* unused; kept reserved */
}

/* small elevation labels next to markers */
.altitude-marker[data-elev] {
    color: var(--limestone);
}
.altitude-marker[data-elev]::after {
    /* arrow, kept */
}

/* ---------- Layout ---------- */
.terrain {
    position: relative;
    z-index: 2;
    padding-left: clamp(48px, 6vw, 96px);
    padding-right: clamp(24px, 4vw, 64px);
}

.section {
    position: relative;
    min-height: 100vh;
    padding: clamp(64px, 10vh, 140px) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    z-index: 2;
}

.section-tag {
    position: absolute;
    top: clamp(32px, 6vh, 64px);
    left: 0;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--limestone);
}
.section-tag.dark { color: var(--slate); }

/* ===================================================== */
/* SECTION 1 - FOOTHILLS                                 */
/* ===================================================== */
.foothills {
    background: var(--paper-slope);
}
.hero-block {
    margin-top: 6vh;
    margin-left: clamp(0px, 4vw, 80px);
}
.hero-title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(4rem, 14vw, 12rem);
    line-height: 0.92;
    letter-spacing: -0.04em;
    color: var(--basalt);
    transform: rotate(3deg);
    transform-origin: left center;
    display: inline-block;
    text-shadow: 0 4px 0 rgba(42, 42, 62, 0.06);
}
.hero-title .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 320ms ease, transform 320ms var(--spring);
}
.hero-title .char.is-in {
    opacity: 1;
    transform: translateY(0);
}
.hero-title .char.dot {
    color: var(--peak-red);
}

.hero-subtitle {
    margin-top: clamp(20px, 4vh, 40px);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: clamp(1.1rem, 2vw, 1.6rem);
    color: var(--slate);
    transform: rotate(-3deg);
    transform-origin: right center;
    display: inline-block;
    letter-spacing: -0.005em;
}

.hero-readings {
    margin-top: clamp(24px, 4vh, 56px);
    margin-left: 4px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--limestone);
    letter-spacing: 0.06em;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: baseline;
}
.hero-readings .sep {
    color: var(--elevation-line);
}

.foothills-caption {
    position: absolute;
    bottom: clamp(40px, 8vh, 80px);
    left: 0;
    right: 0;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--limestone);
    letter-spacing: 0.2em;
    text-transform: lowercase;
}

/* ===================================================== */
/* SECTION 2 / 3 - ASCENT                                */
/* ===================================================== */
.ascent {
    background: var(--paper-slope);
    gap: clamp(32px, 6vh, 64px);
    align-items: stretch;
}
.path-svg {
    width: 100%;
    height: clamp(160px, 26vh, 280px);
    overflow: visible;
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 600ms ease, transform 700ms var(--spring);
    cursor: crosshair;
}
.path-svg.tall {
    height: clamp(200px, 32vh, 360px);
}
.path-svg.is-in {
    opacity: 1;
    transform: translateY(0);
}
.path-svg .path-text {
    transition: transform 320ms var(--spring);
    transform-origin: 50% 100%;
}
.path-svg:hover .path-text {
    transform: scaleY(0.55) translateY(20%);
}
.peak-word {
    transition: font-size 220ms var(--spring);
}
.path-svg .peak-word.is-pulse {
    /* placeholder pulse class hooked from JS */
}

.ascent-prose {
    margin: 0;
    max-width: 720px;
    align-self: flex-start;
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.7;
    color: var(--slate);
    transform: rotate(-1.5deg);
    transform-origin: left center;
}

.ridge-list {
    list-style: none;
    margin: clamp(20px, 4vh, 40px) 0 0;
    padding: 0;
    max-width: 520px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    font-family: var(--font-mono);
    color: var(--basalt);
}
.ridge-list li {
    display: grid;
    grid-template-columns: 28px 1fr auto;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px dashed var(--elevation-line);
}
.ridge-list .bullet {
    color: var(--trail-orange);
    font-size: 0.7rem;
}
.ridge-list span:nth-of-type(2) {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}
.ridge-list em {
    font-style: normal;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    color: var(--limestone);
}

.ascent-one .ascent-prose { transform: rotate(-2deg); }
.ascent-two .ascent-prose { transform: rotate(-1deg); }

/* ===================================================== */
/* SECTION 4 - SUMMIT                                    */
/* ===================================================== */
.summit {
    background: var(--altitude-gray);
    align-items: center;
    text-align: center;
}
.summit-stage {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: clamp(40px, 6vh, 80px) 0;
}
.peak-word-massive {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(8rem, 20vw, 16rem);
    line-height: 0.85;
    letter-spacing: -0.05em;
    color: var(--peak-red);
    text-shadow: 0 8px 0 rgba(42, 42, 62, 0.08);
    transform: scale(1.3);
    opacity: 0;
    transition: transform 600ms var(--spring), opacity 600ms ease;
}
.summit.is-in .peak-word-massive {
    transform: scale(1);
    opacity: 1;
}

.radiating {
    position: relative;
    margin-top: clamp(24px, 4vh, 48px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, 1.4vh, 16px);
}
.radiate {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(0.9rem, 1.2vw, 1.15rem);
    color: var(--basalt);
    letter-spacing: -0.01em;
    transform-origin: center top;
    opacity: 0;
    transform: translateY(-10px) rotate(0deg);
    transition: opacity 500ms ease, transform 500ms var(--spring);
}
.summit.is-in .radiate {
    opacity: 1;
    transform: translateY(0) var(--rot, rotate(0deg));
}
.radiate.r-l2 { --rot: rotate(-15deg); transition-delay: 220ms; }
.radiate.r-l1 { --rot: rotate(-8deg);  transition-delay: 320ms; }
.radiate.r-c  { --rot: rotate(0deg);   transition-delay: 420ms; font-weight: 700; }
.radiate.r-r1 { --rot: rotate(8deg);   transition-delay: 520ms; }
.radiate.r-r2 { --rot: rotate(15deg);  transition-delay: 620ms; }

.summit-altitude {
    margin-top: clamp(40px, 8vh, 80px);
    font-family: var(--font-mono);
    color: var(--limestone);
    font-size: 0.82rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

/* ===================================================== */
/* SECTION 5 / 6 - VALLEY                                */
/* ===================================================== */
.valley {
    background: var(--meadow);
    gap: clamp(24px, 5vh, 56px);
}
.valley .path-text {
    fill: var(--basalt);
}
.valley .path-svg:hover .path-text {
    transform: scaleY(0.7) translateY(15%);
}

.valley-prose {
    margin: 0;
    max-width: 640px;
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 2;
    color: var(--basalt);
}
.valley-prose .valley-accent {
    color: var(--valley-teal);
    font-family: var(--font-accent);
    font-weight: 600;
    font-size: 1.15em;
    letter-spacing: -0.01em;
}
.valley-one { padding-bottom: clamp(80px, 12vh, 160px); }
.valley-two .valley-prose { margin-left: auto; text-align: right; }
.valley-two .valley-prose .valley-accent { display: inline; }

/* ===================================================== */
/* SECTION 7 - HORIZON                                   */
/* ===================================================== */
.horizon {
    background: var(--paper-slope);
    align-items: center;
    text-align: center;
    border-top: 1px solid var(--elevation-line);
}
.horizon-block {
    max-width: 720px;
    width: 100%;
    margin: 0 auto;
    padding: 0 16px;
}
.horizon-prelude {
    margin: 0 0 24px 0;
    font-family: var(--font-mono);
    color: var(--limestone);
    font-size: 0.82rem;
    letter-spacing: 0.2em;
    text-transform: lowercase;
}
.horizon-statement {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.4rem, 2.6vw, 2.2rem);
    color: var(--basalt);
    letter-spacing: -0.02em;
    line-height: 1.4;
}
.horizon-domain {
    margin: clamp(40px, 8vh, 80px) 0 0 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.2rem, 5vw, 4rem);
    color: var(--basalt);
    letter-spacing: -0.04em;
    line-height: 1;
}
.horizon-meta {
    margin: clamp(32px, 6vh, 64px) auto 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--limestone);
    letter-spacing: 0.14em;
    text-transform: lowercase;
}
.horizon-meta .dot-sep { color: var(--elevation-line); }

/* ---------- Footer ---------- */
.terrain-footer {
    padding: 40px 0 60px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--limestone);
    letter-spacing: 0.14em;
    text-transform: lowercase;
    border-top: 1px solid var(--elevation-line);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .hero-title { transform: none !important; }
    .hero-subtitle { transform: none !important; }
    .ascent-prose { transform: none !important; }
    .path-svg { opacity: 1 !important; transform: none !important; }
    .path-svg:hover .path-text { transform: none !important; }
    .peak-word-massive { transform: none !important; opacity: 1 !important; }
    .radiate { opacity: 1 !important; transform: none !important; }
    .hero-title .char { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
    .terrain { padding-left: 24px; padding-right: 16px; }
    .altitude-rail { left: 6px; }
    .hero-block { margin-left: 0; }
    .ridge-list { max-width: 100%; }
    .valley-two .valley-prose { text-align: left; margin-left: 0; }
    .radiate.r-l2, .radiate.r-l1, .radiate.r-r1, .radiate.r-r2 {
        --rot: rotate(0deg);
    }
}