/* ===== CSS Custom Properties ===== */
:root {
    --deep-ground: #0F1729;
    --compartment-surface: #1A2744;
    --slate-ink: #4A5568;
    --pale-slate: #CBD5E1;
    --muted-steel: #94A3B8;
    --airmail-red: #DC4A3A;
    --diplomatic-gold: #C8A951;
    --envelope-cream: #F5F0E8;

    --font-display: 'Outfit', sans-serif;
    --font-body: 'Literata', serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-exit: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 200ms;
    --duration-med: 500ms;
    --duration-slow: 800ms;
    --stagger: 80ms;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--deep-ground);
    color: var(--pale-slate);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--envelope-cream);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-enter);
}

a:hover {
    color: var(--diplomatic-gold);
}

/* ===== Coordinate Navigator ===== */
.coord-nav {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    cursor: pointer;
    user-select: none;
}

.coord-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate-ink);
}

.coord-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted-steel);
    transition: color var(--duration-fast) var(--ease-enter);
}

.coord-nav:hover .coord-value {
    color: var(--diplomatic-gold);
}

/* ===== Nav Overlay ===== */
.nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(15, 23, 41, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-med) var(--ease-enter);
}

.nav-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.nav-overlay-inner {
    text-align: center;
}

.nav-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    background: none;
    border: none;
    color: var(--muted-steel);
    font-size: 2rem;
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-enter);
}

.nav-close:hover {
    color: var(--envelope-cream);
}

.nav-list {
    list-style: none;
}

.nav-list li {
    margin: 1.5rem 0;
}

.nav-list a {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: var(--muted-steel);
    transition: color var(--duration-fast) var(--ease-enter);
}

.nav-list a:hover {
    color: var(--diplomatic-gold);
}

/* ===== SVG Route Overlay ===== */
.route-svg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ===== Station Base ===== */
.station {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

/* ===== Station 0: Dispatch / Hero ===== */
.station-0 {
    padding: 2rem;
}

.hero-container {
    text-align: center;
    width: 100%;
    max-width: 90vw;
}

.hero-letters {
    display: inline-flex;
    gap: 0;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-letter {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(3rem, 8vw, 7rem);
    letter-spacing: -0.03em;
    text-transform: uppercase;
    color: var(--envelope-cream);
    display: inline-block;
    opacity: 0;
    transition: opacity var(--duration-med) var(--ease-enter),
                transform var(--duration-slow) var(--ease-enter);
}

.hero-letter.arrived {
    opacity: 1;
    transform: translate(0, 0) !important;
}

.hero-rule-container {
    position: relative;
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 65%;
    margin-left: auto;
    margin-right: auto;
}

.hero-rule {
    height: 1px;
    background: var(--airmail-red);
    width: 0;
    transition: width 600ms var(--ease-enter);
}

.hero-rule.drawn {
    width: 100%;
}

.hero-coords {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    color: var(--muted-steel);
    white-space: nowrap;
    margin-left: 1rem;
    opacity: 0;
    transition: opacity var(--duration-med) var(--ease-enter);
}

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

.coord-digit, .coord-static {
    display: inline;
}

/* ===== Wax Seals ===== */
.wax-seal {
    transition: transform var(--duration-fast) var(--ease-enter);
}

.wax-seal:hover {
    transform: rotate(3deg);
}

.wax-seal-sm {
    position: absolute;
}

.seal-dispatch {
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
}

.seal-relay-entry {
    top: 2rem;
    left: 3rem;
}

.seal-route-entry {
    top: 2rem;
    left: 3rem;
}

/* ===== Station 1: Relay / Diagonal Compartments ===== */
.station-1 {
    padding: 4rem 2rem;
    min-height: 100vh;
}

.diagonal-wrapper {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    align-items: center;
    width: 100%;
    max-width: 900px;
    transform: rotate(-3deg);
}

@media (min-width: 768px) {
    .diagonal-wrapper {
        transform: rotate(-5deg);
    }
}

.compartment {
    border: 1px solid var(--slate-ink);
    background: var(--compartment-surface);
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    position: relative;
    opacity: 0;
    transform: translateX(-40px) translateY(20px);
    transition: opacity var(--duration-med) var(--ease-enter),
                transform var(--duration-med) var(--ease-enter);
}

.compartment.revealed {
    opacity: 1;
    transform: translateX(0) translateY(0);
}

.compartment-1 { align-self: flex-start; }
.compartment-2 { align-self: center; }
.compartment-3 { align-self: flex-end; }

.compartment-inner {
    transform: rotate(3deg);
}

@media (min-width: 768px) {
    .compartment-inner {
        transform: rotate(5deg);
    }
}

.compartment-id {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted-steel);
    display: block;
    margin-bottom: 0.75rem;
}

.compartment-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    letter-spacing: -0.03em;
    text-transform: uppercase;
    color: var(--envelope-cream);
    margin-bottom: 0.75rem;
}

.compartment-text {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--pale-slate);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.compartment-coords {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--slate-ink);
}

/* Envelope fold lines */
.compartment::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        transparent 45%,
        rgba(74, 85, 104, 0.12) 45%,
        rgba(74, 85, 104, 0.12) 45.5%,
        transparent 45.5%
    );
    pointer-events: none;
}

/* ===== Station 2: Route Map / Timeline ===== */
.station-2 {
    padding: 4rem 2rem;
    min-height: 100vh;
}

.route-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: -0.03em;
    text-transform: uppercase;
    color: var(--envelope-cream);
    margin-bottom: 3rem;
    text-align: center;
}

.timeline-container {
    position: relative;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

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

.timeline-node {
    transition: r var(--duration-med) var(--ease-enter),
                fill var(--duration-med) var(--ease-enter);
}

.timeline-node.active {
    fill: var(--diplomatic-gold);
}

.timeline-line {
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 2s linear;
}

.timeline-line.animated {
    stroke-dashoffset: 0;
}

.timeline-cards {
    position: relative;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.timeline-card {
    flex: 1;
    min-width: 150px;
    max-width: 180px;
    padding: 1rem;
    border: 1px solid var(--slate-ink);
    background: var(--compartment-surface);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--duration-med) var(--ease-exit),
                transform var(--duration-med) var(--ease-exit);
}

.timeline-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.card-id {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--diplomatic-gold);
    display: block;
    margin-bottom: 0.5rem;
}

.timeline-card p {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--pale-slate);
    line-height: 1.6;
}

/* ===== Station 3: Signal / Large Typography ===== */
.station-3 {
    background: var(--compartment-surface);
    padding: 4rem 2rem;
    min-height: 100vh;
    overflow: hidden;
}

.postmark-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.postmark-bg::before,
.postmark-bg::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 2px solid var(--slate-ink);
    opacity: 0.08;
}

.postmark-bg::before {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 15%;
    animation: postmarkPulse 4s ease-in-out infinite;
}

.postmark-bg::after {
    width: 200px;
    height: 200px;
    bottom: 15%;
    right: 20%;
    animation: postmarkPulse 4s ease-in-out infinite 2s;
}

@media (prefers-reduced-motion: no-preference) {
    @keyframes postmarkPulse {
        0%, 100% { opacity: 0.05; }
        50% { opacity: 0.12; }
    }
}

.signal-text-container {
    position: relative;
    max-width: 800px;
    z-index: 2;
}

.signal-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: -0.03em;
    color: var(--envelope-cream);
    line-height: 1.2;
    clip-path: inset(0 100% 0 0);
    transition: clip-path var(--duration-slow) var(--ease-enter);
}

.signal-text.revealed {
    clip-path: inset(0 0 0 0);
}

/* ===== Station 4: Delivered / Footer ===== */
.station-4 {
    padding: 4rem 2rem;
    min-height: 100vh;
}

.destination-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.dest-wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    color: var(--envelope-cream);
    opacity: 0;
    transform: scale(1.3);
    transition: opacity var(--duration-fast) var(--ease-enter),
                transform var(--duration-fast) var(--ease-enter);
}

.dest-wordmark.stamped {
    opacity: 1;
    transform: scale(1);
}

.dest-links {
    display: flex;
    gap: 2rem;
}

.dest-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted-steel);
    opacity: 0;
    transform: scale(1.3);
    transition: opacity var(--duration-fast) var(--ease-enter),
                transform var(--duration-fast) var(--ease-enter),
                color var(--duration-fast) var(--ease-enter);
}

.dest-link:hover {
    color: var(--diplomatic-gold);
}

.dest-link.stamped {
    opacity: 1;
    transform: scale(1);
}

.dest-seal {
    opacity: 0;
    transition: opacity 600ms var(--ease-enter), transform 600ms var(--ease-enter);
    transform: rotate(0deg);
}

.dest-seal.revealed {
    opacity: 1;
    transform: rotate(3deg);
}

.dest-route-line {
    width: 1.5px;
    height: 0;
    background: var(--airmail-red);
    transition: height 800ms var(--ease-enter);
}

.dest-route-line.drawn {
    height: 120px;
}

.dest-copyright {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: var(--slate-ink);
    text-transform: uppercase;
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .hero-letter {
        opacity: 1;
        transform: none !important;
    }

    .hero-rule {
        width: 100%;
    }

    .hero-coords {
        opacity: 1;
    }

    .compartment {
        opacity: 1;
        transform: none;
    }

    .timeline-card {
        opacity: 1;
        transform: none;
    }

    .signal-text {
        clip-path: none;
    }

    .dest-wordmark,
    .dest-link {
        opacity: 1;
        transform: none;
    }

    .dest-seal {
        opacity: 1;
    }
}