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

/* === ROOT VARIABLES === */
:root {
    --deep-forest: #1a3a2a;
    --mid-forest: #2d5a3d;
    --sage: #4a7a5a;
    --pale-moss: #7aaa7a;
    --light-verdant: #e8f0e4;
    --aged-paper: #f4ede4;
    --warm-amber: #c4a35a;
    --near-black: #0a0a0a;
    --faded-ink: #3a3a2a;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Libre Baskerville', serif;
    color: var(--faded-ink);
    background: var(--aged-paper);
    line-height: 1.85;
    letter-spacing: 0.01em;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
}

/* === SECTION RULES === */
.section-rule {
    height: 4px;
    background: var(--near-black);
    border: none;
    margin: 0;
}

/* === SECTION 0 — TITLE PLATE === */
.section-title {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 15%;
    background: var(--deep-forest);
    position: relative;
    box-shadow: inset 0 0 0 8px var(--near-black), inset 0 0 0 28px var(--deep-forest);
    overflow: hidden;
}

.title-content {
    position: relative;
    z-index: 2;
}

.title-text {
    font-family: 'Archivo Black', sans-serif;
    font-size: clamp(6rem, 18vw, 14rem);
    font-weight: 400;
    color: var(--aged-paper);
    line-height: 0.9;
    letter-spacing: -0.02em;
    text-shadow: 2px 0 var(--mid-forest), -2px 0 var(--warm-amber);
    transform: scale(1.15);
    opacity: 0.7;
    transition: transform 1.2s ease-out, opacity 1.2s ease-out;
}

.title-text.focused {
    transform: scale(1);
    opacity: 1;
}

.subtitle {
    font-family: 'Libre Baskerville', serif;
    font-size: 1.1rem;
    color: var(--pale-moss);
    margin-top: 1.5rem;
    font-variant: small-caps;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.8s ease-out 0.6s, transform 0.8s ease-out 0.6s;
}

.subtitle.focused {
    opacity: 1;
    transform: translateY(0);
}

/* Title spiral ornament */
#title-spiral {
    position: absolute;
    bottom: 40px;
    right: 40px;
    width: 60px;
    height: 60px;
    z-index: 2;
}

/* === SPIRAL ORNAMENTS === */
.spiral-small {
    width: 60px;
    height: 60px;
    position: relative;
}

.spiral-small .arc-1 {
    width: 60px;
    height: 60px;
    border-top: 3px solid var(--warm-amber);
    border-right: 3px solid var(--warm-amber);
    border-radius: 0 50% 0 0;
    position: absolute;
    top: 0;
    right: 0;
}

.spiral-small .arc-2 {
    width: 37px;
    height: 37px;
    border-top: 3px solid var(--mid-forest);
    border-left: 3px solid var(--mid-forest);
    border-radius: 50% 0 0 0;
    position: absolute;
    top: 0;
    left: 0;
}

.spiral-small .arc-3 {
    width: 23px;
    height: 23px;
    border-bottom: 3px solid var(--warm-amber);
    border-left: 3px solid var(--warm-amber);
    border-radius: 0 0 0 50%;
    position: absolute;
    bottom: 10px;
    left: 7px;
}

.spiral-small .arc-4 {
    width: 14px;
    height: 14px;
    border-bottom: 3px solid var(--mid-forest);
    border-right: 3px solid var(--mid-forest);
    border-radius: 0 0 50% 0;
    position: absolute;
    bottom: 12px;
    right: 20px;
}

.spiral-tiny {
    width: 30px;
    height: 30px;
    position: absolute;
    bottom: 12px;
    right: 12px;
}

.spiral-tiny .arc-1 {
    width: 30px;
    height: 30px;
    border-top: 2px solid var(--mid-forest);
    border-right: 2px solid var(--mid-forest);
    border-radius: 0 50% 0 0;
    position: absolute;
    top: 0;
    right: 0;
}

.spiral-tiny .arc-2 {
    width: 18px;
    height: 18px;
    border-top: 2px solid var(--sage);
    border-left: 2px solid var(--sage);
    border-radius: 50% 0 0 0;
    position: absolute;
    top: 0;
    left: 0;
}

.spiral-tiny .arc-3 {
    width: 11px;
    height: 11px;
    border-bottom: 2px solid var(--mid-forest);
    border-left: 2px solid var(--mid-forest);
    border-radius: 0 0 0 50%;
    position: absolute;
    bottom: 5px;
    left: 4px;
}

/* === SECTION 1 — SKY REGISTER === */
.section-sky {
    min-height: 80vh;
    background: var(--aged-paper);
    padding: clamp(3rem, 8vw, 8rem) clamp(2rem, 5vw, 6rem);
    position: relative;
    overflow: hidden;
}

.sky-text {
    max-width: 60ch;
    position: relative;
    z-index: 2;
}

.section-heading {
    font-family: 'Archivo Black', sans-serif;
    font-size: clamp(2.5rem, 5vw, 5rem);
    font-weight: 400;
    letter-spacing: 0em;
    text-transform: uppercase;
    color: var(--faded-ink);
    margin-bottom: 2rem;
}

.sky-paragraph {
    margin-bottom: 1.5rem;
    color: var(--faded-ink);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.sky-paragraph.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Concentric Sky Arcs */
.sky-arcs {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%) scale(0.85);
    width: 400px;
    height: 200px;
    transition: transform 0.8s ease-out;
    z-index: 1;
}

.sky-arcs.visible {
    transform: translateY(-50%) scale(1);
}

.arc {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50% 50% 0 0;
    border-top: 3px solid;
    border-left: 3px solid;
    border-right: 3px solid;
    border-bottom: none;
}

.arc-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.08em;
    color: var(--mid-forest);
    position: absolute;
    top: 2px;
    right: -10px;
    white-space: nowrap;
}

.arc-outer {
    width: 400px;
    height: 200px;
    border-color: var(--pale-moss);
}

.arc-mid-outer {
    width: 320px;
    height: 160px;
    border-color: var(--sage);
}

.arc-mid {
    width: 240px;
    height: 120px;
    border-color: var(--mid-forest);
}

.arc-mid-inner {
    width: 160px;
    height: 80px;
    border-color: var(--deep-forest);
}

.arc-inner {
    width: 80px;
    height: 40px;
    border-color: var(--near-black);
}

/* === SECTION 2 — SPECIMEN CARDS === */
.section-specimens {
    background: var(--aged-paper);
    padding: clamp(3rem, 8vw, 8rem) clamp(2rem, 5vw, 6rem);
}

.section-specimens .section-heading {
    margin-bottom: 3rem;
}

.specimen-card {
    border-top: 4px solid var(--near-black);
    background: var(--light-verdant);
    padding: 2rem 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    transition: box-shadow 0.3s ease;
    box-shadow: 0 0 0 transparent;
}

.specimen-card:hover {
    box-shadow: 2px 0 0 var(--mid-forest), -2px 0 0 var(--warm-amber);
}

.card-offset-a {
    margin-left: 5%;
    margin-right: 10%;
}

.card-offset-b {
    margin-left: 15%;
    margin-right: 5%;
}

.specimen-id {
    font-family: 'IBM Plex Mono', monospace;
    font-size: clamp(0.75rem, 1vw, 0.9rem);
    letter-spacing: 0.08em;
    color: var(--mid-forest);
    display: block;
    margin-bottom: 0.5rem;
}

.specimen-term {
    font-family: 'Archivo Black', sans-serif;
    font-size: clamp(1.2rem, 2vw, 2rem);
    font-weight: 400;
    color: var(--faded-ink);
    margin-bottom: 0.75rem;
}

.specimen-desc {
    color: var(--faded-ink);
    max-width: 65ch;
}

/* === SECTION 3 — SHELL DIAGRAM === */
.section-shell {
    height: 100vh;
    background: var(--near-black);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.spiral-container {
    position: relative;
    width: 300px;
    height: 300px;
    transform: scale(0.6);
    opacity: 0;
    transition: transform 1.5s ease-out, opacity 1.5s ease-out;
}

.spiral-container.visible {
    transform: scale(1);
    opacity: 1;
}

.spiral-ring {
    position: absolute;
    border-radius: 0 50% 0 0;
    border-top: 3px solid;
    border-right: 3px solid;
    border-bottom: none;
    border-left: none;
}

.ring-1 {
    width: 300px;
    height: 300px;
    top: 0;
    right: 0;
    border-color: var(--mid-forest);
}

.ring-2 {
    width: 185px;
    height: 185px;
    top: 0;
    right: 0;
    border-color: var(--warm-amber);
    transform: rotate(90deg);
    transform-origin: top right;
}

.ring-3 {
    width: 115px;
    height: 115px;
    bottom: 0;
    right: 0;
    border-color: var(--aged-paper);
    transform: rotate(180deg);
    transform-origin: bottom right;
}

.ring-4 {
    width: 70px;
    height: 70px;
    bottom: 0;
    left: 60px;
    border-color: var(--mid-forest);
    transform: rotate(270deg);
    transform-origin: bottom left;
}

.ring-5 {
    width: 44px;
    height: 44px;
    top: 70px;
    left: 60px;
    border-color: var(--warm-amber);
}

.ring-6 {
    width: 27px;
    height: 27px;
    top: 70px;
    left: 77px;
    border-color: var(--aged-paper);
    transform: rotate(90deg);
    transform-origin: top right;
}

.ring-7 {
    width: 17px;
    height: 17px;
    top: 87px;
    left: 77px;
    border-color: var(--mid-forest);
    transform: rotate(180deg);
    transform-origin: bottom right;
}

.ring-8 {
    width: 10px;
    height: 10px;
    top: 87px;
    left: 84px;
    border-color: var(--warm-amber);
    transform: rotate(270deg);
    transform-origin: bottom left;
}

/* Annotations */
.annotation {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.annotation.visible {
    opacity: 1;
}

.annotation-dot {
    width: 6px;
    height: 6px;
    background: var(--mid-forest);
    border-radius: 50%;
    flex-shrink: 0;
}

.annotation-line {
    width: 60px;
    height: 1px;
    background: var(--mid-forest);
    border: none;
    flex-shrink: 0;
}

.annotation-label {
    font-family: 'Libre Baskerville', serif;
    font-size: 0.8rem;
    color: var(--aged-paper);
    max-width: 250px;
    line-height: 1.4;
}

.annotation-date {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    color: var(--warm-amber);
    letter-spacing: 0.08em;
    display: block;
    margin-bottom: 2px;
}

.annotation-1 {
    top: 25%;
    right: 8%;
}

.annotation-2 {
    top: 55%;
    left: 8%;
    flex-direction: row-reverse;
}

.annotation-3 {
    bottom: 20%;
    right: 10%;
}

/* === SECTION 4 — COLOPHON === */
.section-colophon {
    background: var(--aged-paper);
    padding: clamp(4rem, 10vw, 10rem) clamp(2rem, 5vw, 6rem);
    text-align: left;
}

.library-stamp {
    border: 2px dashed var(--mid-forest);
    border-radius: 4px;
    display: inline-block;
    padding: 0.5rem 1rem;
    transform: rotate(-3deg);
    margin-bottom: 2.5rem;
}

.stamp-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: clamp(0.75rem, 1vw, 0.9rem);
    letter-spacing: 0.08em;
    color: var(--mid-forest);
    display: block;
}

.stamp-date {
    font-family: 'IBM Plex Mono', monospace;
    font-size: clamp(0.75rem, 1vw, 0.9rem);
    letter-spacing: 0.08em;
    color: var(--mid-forest);
    display: block;
}

.colophon-note {
    max-width: 60ch;
    margin-bottom: 2.5rem;
    color: var(--faded-ink);
}

.colophon-domain {
    font-family: 'Archivo Black', sans-serif;
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--faded-ink);
    margin-bottom: 0.5rem;
}

.colophon-closing {
    font-family: 'Libre Baskerville', serif;
    font-size: 1rem;
    color: var(--pale-moss);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .sky-arcs {
        position: relative;
        right: auto;
        top: auto;
        transform: scale(0.7);
        margin: 2rem auto;
    }

    .sky-arcs.visible {
        transform: scale(0.85);
    }

    .card-offset-a,
    .card-offset-b {
        margin-left: 2%;
        margin-right: 2%;
    }

    .annotation {
        display: none;
    }

    .section-title {
        padding-left: 8%;
    }
}