:root {
    --obsidian: #0F1114;
    --basalt: #1A1E24;
    --slate-shelf: #252B33;
    --limestone: #E8DCC8;
    --glacier-gray: #9EAAB4;
    --fog: #5C6670;
    --volcanic-amber: #D4812A;
    --magma-orange: #E85D26;
    --glacial-blue: #3A7CA5;
    --deep-fjord: #1B4D6E;
    --sulfur-gold: #F0C75E;
    --tectonic-blue: #2E5D7B;
    --body-text: #B8C4CE;

    --font-heading: 'Baskervville', serif;
    --font-body: 'Inter', sans-serif;
    --font-accent: 'Fraunces', serif;

    --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background: var(--obsidian);
    color: var(--body-text);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.05rem;
    line-height: 1.75;
    overflow-x: hidden;
}

/* ===== Rift Line ===== */
.rift-line {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background: var(--tectonic-blue);
    z-index: 10;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 800ms ease;
    animation: riftPulse 4s ease-in-out infinite;
}

.rift-line.visible {
    opacity: 0.5;
}

@keyframes riftPulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.7; }
}

/* ===== Mountain Silhouette ===== */
.mountain-silhouette {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    z-index: 5;
    pointer-events: none;
    opacity: 0.05;
}

/* ===== Scroll Progress ===== */
.scroll-progress {
    position: fixed;
    right: 1.5rem;
    top: 10%;
    bottom: 10%;
    width: 2px;
    background: var(--fog);
    z-index: 20;
    opacity: 0.4;
}

.progress-fill {
    width: 100%;
    height: 0%;
    background: var(--volcanic-amber);
    transition: height 100ms linear;
}

/* ===== Sections ===== */
.section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 4rem 3rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 800ms var(--ease-enter), transform 800ms var(--ease-enter);
}

.section.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Hero ===== */
.section-hero {
    opacity: 1;
    transform: none;
    flex-direction: column;
    gap: 1.5rem;
}

.steam-vents {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.steam-particle {
    position: absolute;
    border-radius: 50%;
    background: white;
    opacity: 0;
    animation: steamRise linear forwards;
}

@keyframes steamRise {
    0% { opacity: 0; transform: translate(0, 0); }
    20% { opacity: 0.08; }
    80% { opacity: 0.04; }
    100% { opacity: 0; transform: translate(var(--drift), -100vh); }
}

.hero-split {
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 11;
}

.hero-left, .hero-right {
    font-family: var(--font-heading);
    font-size: clamp(4rem, 10vw, 8rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--limestone);
}

.hero-left .char, .hero-right .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 400ms var(--ease-enter), transform 400ms var(--ease-enter);
}

.hero-left .char.visible, .hero-right .char.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero-sub {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--glacier-gray);
    font-size: 1.05rem;
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
    position: relative;
    z-index: 11;
}

.hero-sub.visible {
    opacity: 1;
}

/* ===== Speaker Sections ===== */
.section-speaker {
    background: radial-gradient(ellipse at center, var(--basalt) 0%, var(--obsidian) 70%);
}

.speaker-text {
    font-family: var(--font-accent);
    font-weight: 900;
    font-size: clamp(2rem, 5vw, 4.5rem);
    color: var(--volcanic-amber);
    text-align: center;
    max-width: 700px;
    line-height: 1.2;
    position: relative;
    z-index: 11;
}

.speaker-text .word {
    display: inline-block;
    opacity: 0;
    transition: opacity 300ms var(--ease-enter);
    margin-right: 0.25em;
}

.speaker-text .word.visible {
    opacity: 1;
}

/* ===== Content Sections ===== */
.section-content {
    background: var(--obsidian);
}

.stone-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 900px;
    width: 100%;
    position: relative;
    z-index: 11;
}

.stone-block {
    background: var(--basalt);
    border: 1px solid var(--slate-shelf);
    padding: 2rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms var(--ease-enter), transform 600ms var(--ease-enter);
}

.stone-block.revealed {
    opacity: 1;
    transform: translateY(0);
}

.block-heading {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--limestone);
    margin-bottom: 1rem;
}

.data-number {
    font-family: var(--font-accent);
    font-weight: 700;
    font-size: clamp(3rem, 6vw, 5rem);
    color: var(--sulfur-gold);
    display: block;
    margin: 0.5rem 0;
}

.data-label {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.9rem;
    color: var(--fog);
}

/* ===== Close Section ===== */
.section-close {
    flex-direction: column;
    gap: 1rem;
}

.close-content {
    text-align: center;
    position: relative;
    z-index: 11;
}

.close-mark {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 4rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--limestone);
    display: block;
}

.close-label {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.9rem;
    color: var(--fog);
    letter-spacing: 0.05em;
}

/* ===== Runic Dividers ===== */
.section + .section::before {
    content: '\2503 \2571 \2503 \00B7 \2503 \2572 \2503';
    display: block;
    text-align: center;
    color: var(--fog);
    font-size: 1.2rem;
    letter-spacing: 0.5em;
    position: absolute;
    top: -1rem;
    width: 100%;
    pointer-events: none;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero-split { gap: 1rem; }
    .stone-grid { grid-template-columns: 1fr; }
    .scroll-progress { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .section { opacity: 1; transform: none; }
    .stone-block { opacity: 1; transform: none; }
}