/* ============================================================
   longitude.day - Styles
   Maritime-Scientific Narrative Experience
   ============================================================ */

/* Custom Properties */
:root {
    --deep-earth: #1A1008;
    --aged-parchment: #E8D5B7;
    --parchment-dark: #D9C4A0;
    --terracotta-brass: #C47A3A;
    --mahogany-ink: #3B2510;
    --weathered-brass: #A89070;
    --phosphor-green: #5BA370;
    --midnight-atlantic: #0D2137;
    --copper-patina: #D4956A;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

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

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: var(--deep-earth);
    color: var(--aged-parchment);
    font-family: var(--font-display);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* SVG Filters (hidden) */
#svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* ============================================================
   THE MERIDIAN LINE - Fixed vertical spine
   ============================================================ */
#meridian-line {
    position: fixed;
    top: 0;
    left: 50%;
    width: 1px;
    height: 100vh;
    background: var(--terracotta-brass);
    z-index: 100;
    transform: translateX(-0.5px);
    opacity: 0;
    transition: opacity 1.5s var(--ease-smooth);
}

#meridian-line.visible {
    opacity: 1;
}

#meridian-line.pulse {
    animation: meridianPulse 3s ease-in-out infinite;
}

@keyframes meridianPulse {
    0%, 100% { box-shadow: 0 0 4px rgba(196, 122, 58, 0.3); opacity: 1; }
    50% { box-shadow: 0 0 12px rgba(196, 122, 58, 0.6); opacity: 0.8; }
}

/* ============================================================
   COORDINATE READOUT - Fixed top-right
   ============================================================ */
#coordinate-readout {
    position: fixed;
    top: 24px;
    right: 32px;
    z-index: 200;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--phosphor-green);
    opacity: 0;
    transition: opacity 1s var(--ease-smooth);
}

#coordinate-readout.visible {
    opacity: 1;
}

#coord-value {
    font-variant-numeric: tabular-nums;
}

#coord-hemisphere {
    margin-left: 4px;
    opacity: 0.7;
}

/* ============================================================
   MAIN SCROLL CONTAINER
   ============================================================ */
#scroll-container {
    scroll-snap-type: y mandatory;
    overflow-y: auto;
    height: 100vh;
}

/* ============================================================
   FULL-SECTION BASE
   ============================================================ */
.full-section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    overflow: hidden;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Section backgrounds */
.section-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* ============================================================
   THEME: TERMINAL (dark)
   ============================================================ */
[data-theme="terminal"] {
    background: var(--deep-earth);
    color: var(--aged-parchment);
}

[data-theme="terminal"] .section-bg {
    background:
        /* Leather grain texture */
        radial-gradient(ellipse at 20% 50%, rgba(59, 37, 16, 0.15) 0%, transparent 70%),
        radial-gradient(ellipse at 80% 30%, rgba(59, 37, 16, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 80%, rgba(26, 16, 8, 0.3) 0%, transparent 50%),
        linear-gradient(180deg, var(--deep-earth) 0%, #1A1008 100%);
}

/* Scanline overlay */
.scanline-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 200%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(91, 163, 112, 0.07) 2px,
        rgba(91, 163, 112, 0.07) 3px
    );
    z-index: 1;
    animation: scanlineDrift 60s linear infinite;
    pointer-events: none;
}

@keyframes scanlineDrift {
    0% { transform: translateY(0); }
    100% { transform: translateY(-50%); }
}

/* Star field */
.star-field {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* ============================================================
   THEME: PARCHMENT (light)
   ============================================================ */
[data-theme="parchment"] {
    background: var(--aged-parchment);
    color: var(--mahogany-ink);
}

.parchment-bg {
    background:
        /* Fiber texture */
        radial-gradient(ellipse at 30% 20%, #E8D5B7 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(217, 196, 160, 0.8) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 90%, rgba(217, 196, 160, 0.6) 0%, transparent 40%),
        /* Base */
        linear-gradient(180deg, #E8D5B7 0%, #D9C4A0 50%, #E8D5B7 100%);
}

/* ============================================================
   THEME: OCEAN (deep blue)
   ============================================================ */
[data-theme="ocean"] {
    background: var(--midnight-atlantic);
    color: var(--aged-parchment);
}

.ocean-bg {
    background:
        radial-gradient(ellipse at 50% 30%, rgba(13, 33, 55, 0.8) 0%, transparent 60%),
        radial-gradient(ellipse at 20% 70%, rgba(13, 33, 55, 0.6) 0%, transparent 50%),
        linear-gradient(180deg, #0D2137 0%, #0a1a2d 50%, #0D2137 100%);
}

/* ============================================================
   SECTION CONTENT
   ============================================================ */
.section-content {
    position: relative;
    z-index: 10;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 40px;
    width: 100%;
}

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

/* ============================================================
   TYPOGRAPHY
   ============================================================ */

/* Display heading - massive LONGITUDE title */
.display-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(60px, 12vw, 140px);
    letter-spacing: 0.08em;
    color: var(--terracotta-brass);
    margin-bottom: 40px;
    line-height: 1;
    display: flex;
    justify-content: center;
    gap: 0.02em;
}

.display-heading .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
    transition-delay: calc(var(--delay) * 0.12s);
}

.display-heading.animate .letter {
    opacity: 1;
    transform: translateY(0);
}

/* Section headings */
.section-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(36px, 5vw, 72px);
    letter-spacing: 0.04em;
    color: var(--terracotta-brass);
    margin-bottom: 16px;
    line-height: 1.1;
}

.section-heading.dark-text {
    color: var(--mahogany-ink);
}

.section-heading.light-heading {
    color: var(--terracotta-brass);
}

/* Instrument labels */
.instrument-label {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--weathered-brass);
    margin-bottom: 32px;
}

.instrument-label.light-label {
    color: var(--weathered-brass);
}

/* Body text */
.body-text {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 19px;
    line-height: 1.78;
    color: var(--aged-parchment);
    max-width: 640px;
    margin: 0 auto 24px;
    text-align: left;
}

.body-text em {
    font-style: italic;
    color: var(--copper-patina);
}

.body-text.dark-body {
    color: var(--mahogany-ink);
}

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

/* Data readout text */
.green-text {
    color: var(--phosphor-green);
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

/* ============================================================
   COUNTER DISPLAY (Section 1)
   ============================================================ */
.counter-display {
    font-family: var(--font-mono);
    font-size: clamp(24px, 4vw, 48px);
    color: var(--phosphor-green);
    margin-bottom: 32px;
    font-variant-numeric: tabular-nums;
    opacity: 0;
    transition: opacity 1s var(--ease-smooth);
}

.counter-display.visible {
    opacity: 1;
}

/* ============================================================
   MERIDIAN CROSSHAIR
   ============================================================ */
.meridian-crosshair {
    width: 60px;
    height: 60px;
    margin: 24px auto 40px;
    position: relative;
}

.meridian-crosshair::before,
.meridian-crosshair::after {
    content: '';
    position: absolute;
    background: var(--terracotta-brass);
}

.meridian-crosshair::before {
    width: 1px;
    height: 100%;
    left: 50%;
    transform: translateX(-0.5px);
}

.meridian-crosshair::after {
    width: 100%;
    height: 1px;
    top: 50%;
    transform: translateY(-0.5px);
}

/* ============================================================
   COORDINATE MARGINALIA
   ============================================================ */
.coordinate-marginalia {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    opacity: 0.12;
    color: var(--weathered-brass);
    writing-mode: vertical-lr;
    z-index: 5;
}

.coordinate-marginalia.left {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.coordinate-marginalia.right {
    right: 20px;
    top: 50%;
    transform: translateY(-50%) rotate(180deg);
}

[data-theme="parchment"] .coordinate-marginalia {
    color: var(--mahogany-ink);
}

/* ============================================================
   CONCENTRIC RINGS
   ============================================================ */
.concentric-rings {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    z-index: 1;
    pointer-events: none;
}

/* ============================================================
   SECTION WAYPOINTS
   ============================================================ */
.section-waypoint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    opacity: 0.5;
}

.waypoint-symbol {
    display: block;
}

/* ============================================================
   FADE-IN ANIMATION
   ============================================================ */
.fade-in-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
}

.fade-in-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   SPLIT CONTENT (Section 2)
   ============================================================ */
.split-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
    padding-top: 100px;
}

.split-left,
.split-right {
    padding: 0 20px;
}

/* Data panel */
.data-panel {
    border: 1px solid var(--terracotta-brass);
    box-shadow: inset 0 0 20px rgba(196, 122, 58, 0.15);
    padding: 20px;
    margin: 20px 0 24px;
    background: rgba(26, 16, 8, 0.4);
}

.data-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid rgba(168, 144, 112, 0.15);
}

.data-row:last-child {
    border-bottom: none;
}

.data-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--weathered-brass);
}

.data-value {
    font-family: var(--font-mono);
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

/* Chronometer SVG */
.chronometer-container {
    max-width: 300px;
    margin: 0 auto 24px;
}

.instrument-drawing {
    width: 100%;
    height: auto;
}

.draw-path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 2s var(--ease-smooth);
}

.draw-path.drawn {
    stroke-dashoffset: 0;
}

.chrono-numeral {
    opacity: 0;
    transition: opacity 0.8s var(--ease-smooth);
}

.chrono-numeral.visible {
    opacity: 1;
}

/* ============================================================
   COMPASS ROSE (Section 3)
   ============================================================ */
.compass-rose-container {
    max-width: 320px;
    margin: 32px auto;
}

.compass-rose-svg {
    width: 100%;
    height: auto;
}

/* ============================================================
   MERIDIAN PROPOSALS (Section 3)
   ============================================================ */
.proposal-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    max-width: 720px;
    margin: 32px auto;
}

.proposal-item {
    border: 1px solid rgba(196, 122, 58, 0.3);
    box-shadow: inset 0 0 20px rgba(196, 122, 58, 0.08);
    padding: 16px 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: rgba(13, 33, 55, 0.5);
    transition: border-color 0.4s var(--ease-smooth), box-shadow 0.4s var(--ease-smooth);
}

.proposal-item.resolved {
    border-color: var(--phosphor-green);
    box-shadow: inset 0 0 20px rgba(91, 163, 112, 0.15), 0 0 8px rgba(91, 163, 112, 0.1);
}

.proposal-city {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--weathered-brass);
}

.proposal-item.resolved .proposal-city {
    color: var(--phosphor-green);
}

.proposal-coord {
    font-family: var(--font-mono);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    color: var(--phosphor-green);
    opacity: 0.7;
}

.proposal-item.resolved .proposal-coord {
    opacity: 1;
}

/* ============================================================
   TIMELINE (Section 4)
   ============================================================ */
.timeline-container {
    position: relative;
    max-width: 700px;
    margin: 40px auto;
    padding-left: 50%;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--terracotta-brass);
    opacity: 0.4;
    transform: translateX(-0.5px);
}

.timeline-entry {
    position: relative;
    margin-bottom: 40px;
    padding-left: 40px;
}

.timeline-entry:nth-child(odd) {
    transform: translateX(-100%);
    padding-left: 0;
    padding-right: 40px;
    text-align: right;
}

.timeline-panel {
    position: relative;
    padding: 20px 24px;
}

.brass-panel {
    border: 1px solid var(--terracotta-brass);
    box-shadow: inset 0 0 20px rgba(196, 122, 58, 0.15), 4px 4px 0 rgba(59, 37, 16, 0.12);
    background: rgba(26, 16, 8, 0.6);
    transition: transform 0.4s var(--ease-smooth), box-shadow 0.4s var(--ease-smooth);
}

.brass-panel:hover {
    transform: translateY(-2px);
    box-shadow: inset 0 0 20px rgba(196, 122, 58, 0.2), 6px 6px 0 rgba(59, 37, 16, 0.15);
}

.timeline-year {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 500;
    color: var(--terracotta-brass);
    display: block;
    margin-bottom: 4px;
    font-variant-numeric: tabular-nums;
}

.timeline-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--weathered-brass);
    display: block;
    margin-bottom: 12px;
}

.timeline-desc {
    font-family: var(--font-display);
    font-size: 16px;
    line-height: 1.6;
    color: var(--aged-parchment);
    margin-bottom: 12px;
}

.timeline-accuracy {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--phosphor-green);
    font-variant-numeric: tabular-nums;
}

/* ============================================================
   SATELLITE READOUT (Section 5)
   ============================================================ */
.satellite-readout {
    border: 1px solid var(--terracotta-brass);
    box-shadow: inset 0 0 20px rgba(196, 122, 58, 0.15);
    background: rgba(26, 16, 8, 0.7);
    max-width: 500px;
    margin: 32px auto;
    padding: 24px 32px;
}

.readout-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(168, 144, 112, 0.1);
}

.readout-row:last-child {
    border-bottom: none;
}

.readout-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--weathered-brass);
}

.readout-value {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--phosphor-green);
    font-variant-numeric: tabular-nums;
}

.blink-slow {
    animation: blinkSlow 2s ease-in-out infinite;
}

@keyframes blinkSlow {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* Constellation list */
.constellation-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 640px;
    margin: 32px auto;
}

.constellation-item {
    text-align: center;
    padding: 16px 8px;
    border: 1px solid rgba(196, 122, 58, 0.2);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.constellation-name {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--phosphor-green);
}

.constellation-nation {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.1em;
    color: var(--weathered-brass);
    opacity: 0.7;
}

.constellation-year {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--copper-patina);
    font-variant-numeric: tabular-nums;
}

/* ============================================================
   ORBITAL ARCS (Section 5)
   ============================================================ */
.orbital-arcs {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

/* ============================================================
   CLOSING SECTION (Section 6)
   ============================================================ */
.closing-meditation {
    max-width: 640px;
    margin: 0 auto 60px;
}

.final-meridian {
    width: 2px;
    height: 120px;
    margin: 40px auto;
    position: relative;
    background: var(--terracotta-brass);
    transition: width 2s var(--ease-smooth), box-shadow 2s var(--ease-smooth);
}

.final-meridian.expanded {
    width: 4px;
    box-shadow: 0 0 20px rgba(196, 122, 58, 0.4), 0 0 40px rgba(196, 122, 58, 0.2);
}

.meridian-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(196, 122, 58, 0.15) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 2s var(--ease-smooth);
}

.final-meridian.expanded .meridian-glow {
    opacity: 1;
}

.closing-coord {
    margin-top: 24px;
    color: var(--phosphor-green);
    font-size: 16px;
}

.closing-label {
    color: var(--weathered-brass);
    font-size: 12px;
    margin-top: 8px;
}

/* ============================================================
   CONCENTRIC RINGS (CSS-generated)
   ============================================================ */
.concentric-rings::before,
.concentric-rings::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 0.5px solid rgba(196, 122, 58, 0.08);
}

.concentric-rings::before {
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    transform: translate(-50%, -50%);
}

.concentric-rings::after {
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    transform: translate(-50%, -50%);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
    .split-content {
        grid-template-columns: 1fr;
        gap: 40px;
        padding-top: 60px;
    }

    .proposal-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .constellation-list {
        grid-template-columns: repeat(2, 1fr);
    }

    .timeline-container {
        padding-left: 30px;
    }

    .timeline-container::before {
        left: 0;
    }

    .timeline-entry {
        padding-left: 30px;
    }

    .timeline-entry:nth-child(odd) {
        transform: none;
        padding-left: 30px;
        padding-right: 0;
        text-align: left;
    }
}

@media (max-width: 600px) {
    .section-content {
        padding: 60px 24px;
    }

    .body-text {
        font-size: 17px;
    }

    .display-heading {
        font-size: clamp(40px, 10vw, 80px);
    }

    .coordinate-marginalia {
        display: none;
    }

    #coordinate-readout {
        top: 16px;
        right: 16px;
        font-size: 11px;
    }

    .proposal-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .constellation-list {
        grid-template-columns: 1fr 1fr;
    }
}