/* ============================================================
   CBDC.STUDIO — Sovereign Digital Currency Design
   Ethereal Blue Palette | Libre Baskerville + IBM Plex Mono
   Compliance terms: Consolas' Georgia' (`"CBDC-2026-001"` `0.75rem` accents creates "government document meets financial dashboard" typographic that other batch achieves. reserved strictly data/serial-number `color: Mono" (Google Interaction Pattern (5% frequency IntersectionObserver-triggered reveals IntersectionObserver` `threshold: 0.15`
   ============================================================ */

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

:root {
    /* Ethereal Blue: The Sovereign Spectrum */
    --midnight: #0d1b2a;
    --midnight-deep: #132b3e;
    --obsidian: #1a2634;
    --reserve-slate: #4a6d8c;
    --ethereal-cerulean: #7ba7c9;
    --sterling-silver: #c5d1dc;
    --vault-marble: #e8eef4;
    --parchment-cream: #f5f0e8;
    --sovereign-gold: #c4a265;
    --devaluation-red: #a63d40;

    /* Fonts */
    --font-display: Georgia, 'Times New Roman', serif;
    --font-body: Georgia, 'Times New Roman', serif;
    --font-mono: 'IBM Plex Mono', Consolas, 'Courier New', monospace;

    /* Motion */
    --ease-press: cubic-bezier(0.22, 1, 0.36, 1);
}

html {
    background: var(--midnight);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    color: var(--sterling-silver);
    background: var(--midnight);
    line-height: 1.72;
    overflow-x: hidden;
}

img,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.4s var(--ease-press);
}

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

/* ============================================================
   CHAMBER NAVIGATION (Right-edge vertical line with 4 dots)
   ============================================================ */

.chamber-nav {
    position: fixed;
    top: 50%;
    right: 32px;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
}

.chamber-nav-line {
    position: absolute;
    top: -40px;
    bottom: -40px;
    left: 50%;
    width: 1px;
    background: var(--reserve-slate);
    opacity: 0.35;
    transform: translateX(-50%);
}

.chamber-nav-dots {
    position: relative;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding: 0;
    margin: 0;
}

.chamber-dot {
    display: block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--reserve-slate);
    position: relative;
    transition: background 0.6s var(--ease-press), transform 0.6s var(--ease-press);
}

.chamber-dot::before {
    content: "";
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    border: 1px solid var(--sovereign-gold);
    opacity: 0;
    transform: scale(0.6);
    transition: opacity 0.6s var(--ease-press), transform 0.6s var(--ease-press);
}

.chamber-dot.active {
    background: var(--sovereign-gold);
    transform: scale(1.4);
}

.chamber-dot.active::before {
    opacity: 1;
    transform: scale(1);
}

/* ============================================================
   SECTION 1: THE VAULT DOOR
   ============================================================ */

.vault-door {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(175deg, #0d1b2a 0%, #132b3e 40%, #0d1b2a 100%);
    padding: 96px 48px;
}

.vault-guilloche {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.18;
    pointer-events: none;
}

.guilloche-ring {
    animation: guilloche-rotate 120s linear infinite;
}

.guilloche-ring-middle {
    animation: guilloche-rotate-rev 180s linear infinite;
}

.guilloche-ring-inner {
    animation: guilloche-rotate 90s linear infinite;
}

@keyframes guilloche-rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes guilloche-rotate-rev {
    from {
        transform: rotate(360deg);
    }
    to {
        transform: rotate(0deg);
    }
}

.vault-door-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 48px;
}

.vault-serial {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 960px;
    opacity: 0;
    animation: fade-up 1.2s var(--ease-press) 0.1s forwards;
}

.wordmark-row {
    display: flex;
    align-items: center;
    gap: 32px;
    width: 100%;
    max-width: 1040px;
    opacity: 0;
    animation: fade-up 1.2s var(--ease-press) 0.3s forwards;
}

.rule {
    flex: 1;
    border: none;
    height: 1px;
    background: var(--reserve-slate);
    opacity: 0.5;
    position: relative;
}

.rule::after {
    content: "";
    position: absolute;
    top: -2px;
    width: 5px;
    height: 5px;
    border: 1px solid var(--reserve-slate);
    background: var(--midnight);
    transform: rotate(45deg);
}

.rule-left::after {
    right: 0;
}

.rule-right::after {
    left: 0;
}

.wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sterling-silver);
    line-height: 1;
    white-space: nowrap;
}

.vault-tagline {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    opacity: 0;
    animation: fade-up 1.2s var(--ease-press) 0.6s forwards;
}

.vault-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 20px;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    opacity: 0;
    animation: fade-up 1.2s var(--ease-press) 0.9s forwards;
}

.vault-meta-divider {
    color: var(--sovereign-gold);
    font-size: 0.5rem;
}

.vault-descend {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    opacity: 0;
    animation: fade-up 1.2s var(--ease-press) 1.2s forwards;
}

.descend-label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--reserve-slate);
}

.descend-line {
    width: 1px;
    height: 56px;
    background: linear-gradient(to bottom, var(--reserve-slate) 0%, transparent 100%);
    position: relative;
    overflow: hidden;
}

.descend-line::after {
    content: "";
    position: absolute;
    top: -14px;
    left: 0;
    width: 100%;
    height: 14px;
    background: var(--sovereign-gold);
    animation: descend-pulse 2.6s var(--ease-press) infinite;
}

@keyframes descend-pulse {
    0% {
        top: -14px;
        opacity: 0;
    }
    40% {
        opacity: 1;
    }
    100% {
        top: 56px;
        opacity: 0;
    }
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   SECTION 2: THE LEDGER (Card Grid)
   ============================================================ */

.ledger {
    background: var(--vault-marble);
    color: var(--obsidian);
    padding: 96px 48px;
    position: relative;
    overflow: hidden;
}

.ledger::before {
    content: "";
    position: absolute;
    top: 48px;
    left: 48px;
    right: 48px;
    height: 2px;
    background: linear-gradient(to right, transparent 0%, var(--reserve-slate) 20%, var(--reserve-slate) 80%, transparent 100%);
    opacity: 0.25;
}

.ledger::after {
    content: "";
    position: absolute;
    bottom: 48px;
    left: 48px;
    right: 48px;
    height: 2px;
    background: linear-gradient(to right, transparent 0%, var(--reserve-slate) 20%, var(--reserve-slate) 80%, transparent 100%);
    opacity: 0.25;
}

.ledger-inner {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.section-chapter {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    position: relative;
    padding: 0 32px;
}

.section-chapter::before,
.section-chapter::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 20px;
    height: 1px;
    background: var(--sovereign-gold);
}

.section-chapter::before {
    left: 0;
}

.section-chapter::after {
    right: 0;
}

.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-style: italic;
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    letter-spacing: 0.06em;
    color: var(--obsidian);
    line-height: 1.2;
}

.section-lede {
    max-width: 62ch;
    font-size: 1rem;
    line-height: 1.72;
    color: var(--obsidian);
    opacity: 0.82;
}

/* ---------- Card Grid ---------- */

.ledger-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.denom-card {
    position: relative;
    background: var(--parchment-cream);
    padding: 32px;
    aspect-ratio: 380 / 240;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-press), transform 0.8s var(--ease-press), background 0.5s var(--ease-press);
    outline: 2px solid var(--reserve-slate);
    outline-offset: -2px;
}

.denom-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.denom-card:hover {
    background: #ece7de;
}

/* Border-animate: four-segment draw effect */
.card-border {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(var(--ethereal-cerulean), var(--ethereal-cerulean)) top left / 0% 2px no-repeat,
        linear-gradient(var(--ethereal-cerulean), var(--ethereal-cerulean)) top right / 2px 0% no-repeat,
        linear-gradient(var(--ethereal-cerulean), var(--ethereal-cerulean)) bottom right / 0% 2px no-repeat,
        linear-gradient(var(--ethereal-cerulean), var(--ethereal-cerulean)) bottom left / 2px 0% no-repeat;
    transition: background-size 0.8s var(--ease-press);
    z-index: 3;
}

.denom-card:hover .card-border {
    background-size: 100% 2px, 2px 100%, 100% 2px, 2px 100%;
}

/* Corner ornaments */
.card-corners {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.corner {
    position: absolute;
    width: 14px;
    height: 14px;
    border: 1px solid var(--sovereign-gold);
    opacity: 0;
    transition: opacity 0.6s var(--ease-press);
}

.corner-tl {
    top: 8px;
    left: 8px;
    border-right: none;
    border-bottom: none;
}

.corner-tr {
    top: 8px;
    right: 8px;
    border-left: none;
    border-bottom: none;
}

.corner-br {
    bottom: 8px;
    right: 8px;
    border-left: none;
    border-top: none;
}

.corner-bl {
    bottom: 8px;
    left: 8px;
    border-right: none;
    border-top: none;
}

.denom-card:hover .corner {
    opacity: 0.9;
}

.card-serial {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    position: relative;
    z-index: 1;
}

.card-viz {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    transition: transform 0.4s var(--ease-press);
    position: relative;
    z-index: 1;
}

.card-viz svg {
    width: 100%;
    height: 100%;
    max-height: 160px;
}

.denom-card:hover .viz-line,
.denom-card:hover .viz-area {
    transform: scaleY(1.05);
    transform-origin: bottom center;
    transition: transform 0.4s var(--ease-press);
}

.denom-card:hover .viz-area {
    opacity: 1;
}

/* Gauge arc animation on hover */
.gauge-arc {
    transition: stroke-dashoffset 0.8s var(--ease-press);
}

/* Network pulse */
.node-pulse {
    transform-origin: 160px 70px;
    animation: pulse-ring 2.4s var(--ease-press) infinite;
}

@keyframes pulse-ring {
    0% {
        r: 6;
        opacity: 0.9;
    }
    100% {
        r: 22;
        opacity: 0;
    }
}

/* Bars animate on hover */
.bar {
    transform-origin: left center;
    transition: transform 0.6s var(--ease-press);
}

.denom-card:hover .bar-gold {
    transform: scaleX(1.03);
}

.card-body {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-denom {
    font-family: var(--font-display);
    font-weight: 700;
    font-style: italic;
    font-size: 1.375rem;
    letter-spacing: 0.02em;
    color: var(--obsidian);
    line-height: 1.2;
}

.card-desc {
    font-family: var(--font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--obsidian);
    opacity: 0.72;
    max-width: 40ch;
}

/* Ledger footnote */
.ledger-footnote {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding-top: 32px;
    border-top: 1px solid var(--reserve-slate);
    border-top-color: rgba(74, 109, 140, 0.3);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    color: var(--reserve-slate);
    line-height: 1.7;
    max-width: 88ch;
    margin: 0 auto;
}

.footnote-mark {
    color: var(--sovereign-gold);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* ============================================================
   SECTION 3: THE RESERVE (Data Chart)
   ============================================================ */

.reserve {
    background: var(--midnight);
    padding: 96px 48px;
    position: relative;
    overflow: hidden;
}

.reserve-inner {
    max-width: 1280px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.reserve-header {
    margin-bottom: 80px;
}

.reserve-chapter,
.reserve-title,
.reserve-lede {
    color: var(--sterling-silver);
}

.reserve-chapter {
    color: var(--reserve-slate);
}

.reserve-lede {
    color: var(--sterling-silver);
    opacity: 0.72;
}

.reserve-chart-wrap {
    position: relative;
    padding-left: 72px;
    padding-bottom: 48px;
}

.reserve-chart-axis {
    position: absolute;
    top: 0;
    left: 0;
    height: 400px;
    width: 56px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.14em;
    color: var(--reserve-slate);
    text-align: right;
    padding-right: 8px;
    border-right: 1px solid var(--obsidian);
}

.reserve-chart {
    width: 100%;
    height: 400px;
    display: block;
}

.reserve-line {
    stroke-dasharray: 2400;
    stroke-dashoffset: 2400;
    transition: stroke-dashoffset 2.4s var(--ease-press);
}

.reserve.visible .reserve-line {
    stroke-dashoffset: 0;
}

.reserve-area {
    opacity: 0;
    transition: opacity 1.6s var(--ease-press) 0.6s;
}

.reserve.visible .reserve-area {
    opacity: 1;
}

.reserve-markers circle {
    opacity: 0;
    transition: opacity 0.6s var(--ease-press);
}

.reserve.visible .reserve-markers circle {
    opacity: 1;
}

.reserve.visible .reserve-markers circle:nth-child(1) {
    transition-delay: 0.8s;
}
.reserve.visible .reserve-markers circle:nth-child(2) {
    transition-delay: 1.2s;
}
.reserve.visible .reserve-markers circle:nth-child(3) {
    transition-delay: 1.6s;
}
.reserve.visible .reserve-markers circle:nth-child(4) {
    transition-delay: 2s;
}

.reserve-years {
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.14em;
    color: var(--reserve-slate);
}

.reserve-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    margin-top: 64px;
    padding-top: 32px;
    border-top: 1px solid var(--obsidian);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--sterling-silver);
    opacity: 0.8;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.legend-swatch {
    display: inline-block;
    width: 24px;
    height: 2px;
}

.legend-swatch-line {
    background: var(--ethereal-cerulean);
}

.legend-swatch-marker {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--sovereign-gold);
}

.legend-swatch-area {
    width: 24px;
    height: 10px;
    background: linear-gradient(to bottom, rgba(123, 167, 201, 0.3), transparent);
    border: 1px solid rgba(123, 167, 201, 0.3);
}

.reserve-skyline {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 120px;
    opacity: 0.08;
    z-index: 1;
    pointer-events: none;
}

/* ============================================================
   SECTION 4: THE SEAL (Footer)
   ============================================================ */

.seal {
    background: var(--midnight);
    padding: 64px 48px;
    text-align: center;
    border-top: 1px solid var(--obsidian);
    position: relative;
}

.seal::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background: var(--sovereign-gold);
    opacity: 0.6;
}

.seal-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

.seal-svg {
    width: 180px;
    height: 180px;
    margin-bottom: 16px;
}

.seal-outer {
    transition: stroke-dashoffset 3s var(--ease-press);
}

.seal.visible .seal-outer {
    stroke-dashoffset: 0;
}

.seal-guilloche {
    animation: guilloche-rotate 60s linear infinite;
}

.seal-rule {
    width: 80px;
    height: 1px;
    background: var(--sovereign-gold);
    opacity: 0.5;
}

.seal-wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.625rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sterling-silver);
}

.seal-tagline {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--reserve-slate);
    margin-top: -12px;
}

.seal-meta {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    width: 100%;
    max-width: 720px;
    margin-top: 24px;
    padding: 32px 0;
    border-top: 1px solid var(--obsidian);
    border-bottom: 1px solid var(--obsidian);
}

.seal-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-align: center;
}

.seal-col-label {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 300;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--reserve-slate);
}

.seal-col-value {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 0.9375rem;
    letter-spacing: 0.04em;
    color: var(--sterling-silver);
    transition: color 0.4s var(--ease-press);
}

a.seal-col-value:hover {
    color: var(--sovereign-gold);
}

.seal-footline {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px;
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 300;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--reserve-slate);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 960px) {
    .chamber-nav {
        right: 16px;
    }

    .ledger,
    .reserve {
        padding: 96px 32px;
    }

    .vault-door {
        padding: 96px 32px;
    }

    .seal {
        padding: 72px 32px 48px;
    }

    .reserve-chart-wrap {
        padding-left: 56px;
    }

    .reserve-chart-axis {
        width: 40px;
        font-size: 0.625rem;
    }
}

@media (max-width: 720px) {
    .chamber-nav {
        display: none;
    }

    .vault-serial {
        flex-direction: column;
        gap: 8px;
        text-align: center;
        align-items: center;
    }

    .wordmark-row {
        gap: 12px;
    }

    .wordmark {
        font-size: 2.25rem;
        letter-spacing: 0.14em;
    }

    .vault-meta {
        gap: 10px;
        font-size: 0.625rem;
    }

    .ledger-grid {
        grid-template-columns: 1fr;
    }

    .denom-card {
        aspect-ratio: auto;
        min-height: 340px;
    }

    .reserve-chart {
        height: 280px;
    }

    .reserve-chart-axis {
        height: 280px;
    }

    .reserve-years {
        min-width: 720px;
        font-size: 0.5625rem;
        letter-spacing: 0.1em;
    }

    .reserve-chart-wrap {
        overflow-x: auto;
        padding-left: 56px;
    }

    .reserve-chart-axis {
        position: sticky;
        left: 0;
        z-index: 3;
        background: var(--midnight);
    }

    .reserve-chart {
        min-width: 720px;
    }

    .reserve-legend {
        gap: 20px;
        flex-direction: column;
        align-items: flex-start;
    }

    .seal-meta {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .seal-footline {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .ledger,
    .reserve {
        padding: 72px 24px;
    }

    .vault-door {
        padding: 72px 24px;
    }

    .reserve-chart {
        height: 220px;
    }

    .reserve-chart-axis {
        height: 220px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}