:root {
    --bureau-green: #1B3A2D;
    --parchment: #FAF7F0;
    --parchment-alt: #F5F0E1;
    --ink: #2A2A28;
    --seal-gold: #B8860B;
    --stamp-red: #8B2500;
    --ledger-blue: #4A6FA5;
    --faded-violet: #5A4E3C;
}

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

html {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    background-color: var(--parchment);
    color: var(--ink);
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===================== BUREAU HEADER ===================== */
.bureau-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 48px;
    background-color: var(--bureau-green);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 100;
}

.header-domain {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--parchment);
}

.header-serial {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--seal-gold);
}

.header-seal {
    flex-shrink: 0;
}

/* ===================== PAGE LAYOUT ===================== */
.page-layout {
    display: flex;
    margin-top: 48px;
}

/* ===================== SIDEBAR ===================== */
.sidebar-index {
    width: 220px;
    min-width: 220px;
    position: sticky;
    top: 48px;
    height: calc(100vh - 48px);
    padding: 2rem 1rem;
    background-color: var(--parchment-alt);
    border-right: 1px solid var(--bureau-green);
    overflow-y: auto;
}

.sidebar-entry {
    display: flex;
    align-items: baseline;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: color 300ms ease;
}

.sidebar-entry.active .sidebar-label,
.sidebar-entry.active .sidebar-num {
    color: var(--seal-gold);
}

.sidebar-entry.active .sidebar-label::before {
    content: "\25B6 ";
    font-size: 0.5rem;
    margin-right: 0.3rem;
}

.sidebar-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--ink);
    white-space: nowrap;
}

.sidebar-leader {
    flex: 1;
    border-bottom: 1px dotted var(--faded-violet);
    margin: 0 0.3rem;
    min-width: 10px;
    position: relative;
    top: -3px;
}

.sidebar-num {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.7rem;
    color: var(--faded-violet);
}

/* ===================== MAIN CONTENT ===================== */
.main-content {
    flex: 1;
    padding: 4rem 80px;
    max-width: 1000px;
}

/* ===================== CERTIFICATE PANELS ===================== */
.cert-panel {
    margin-bottom: 120px;
    position: relative;
    opacity: 0;
    transition: opacity 400ms ease;
}

.cert-panel.visible {
    opacity: 1;
}

.panel-reg {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--faded-violet);
    text-align: right;
    margin-bottom: 0.5rem;
}

/* Triple-rule borders */
.panel-border-outer {
    border: 1px solid var(--bureau-green);
    padding: 4px;
}

.panel-border-mid {
    border: 3px solid var(--bureau-green);
    padding: 4px;
}

.panel-border-inner {
    border: 1px solid var(--bureau-green);
    padding: 40px;
    position: relative;
    background-color: var(--parchment);
}

.panel-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3.2rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--bureau-green);
    text-align: center;
    margin-bottom: 2rem;
}

/* Two-column text */
.panel-columns {
    display: flex;
    gap: 0;
}

.panel-col {
    flex: 1;
    text-align: justify;
    hyphens: auto;
}

.panel-divider {
    width: 1px;
    background-color: var(--bureau-green);
    margin: 0 2rem;
}

.panel-col p {
    margin-bottom: 1.2rem;
}

.panel-seal {
    position: absolute;
    bottom: -30px;
    right: -30px;
}

/* Drop cap */
.drop-cap {
    float: left;
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 4rem;
    line-height: 0.8;
    color: var(--seal-gold);
    margin-right: 0.15em;
    margin-top: 0.05em;
}

/* ===================== PANEL II: CLASSIFICATIONS ===================== */
.panel-asymmetric {
    display: flex;
    gap: 2rem;
}

.classify-content {
    flex: 6;
}

.classify-specimen {
    flex: 4;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.specimen-watermark {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 3rem;
    letter-spacing: 0.2em;
    color: var(--stamp-red);
    opacity: 0.15;
    transform: rotate(90deg);
    position: absolute;
    white-space: nowrap;
}

.taxonomy {
    margin-top: 1rem;
}

.tax-item {
    display: flex;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.tax-indent {
    padding-left: 2rem;
}

.tax-num {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--bureau-green);
    min-width: 3rem;
    letter-spacing: 0.04em;
}

.tax-text {
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: 0.95rem;
}

/* License card */
.license-card {
    width: 260px;
    height: 180px;
    border: 2px solid var(--bureau-green);
    background-color: var(--parchment-alt);
    padding: 1rem;
    position: relative;
    z-index: 1;
}

.card-field {
    display: flex;
    align-items: baseline;
    margin-bottom: 0.8rem;
}

.card-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    color: var(--bureau-green);
    white-space: nowrap;
    margin-right: 0.5rem;
}

.card-blank {
    flex: 1;
    border-bottom: 1px solid var(--ink);
    min-height: 1rem;
}

.card-seal {
    position: absolute;
    bottom: 8px;
    right: 8px;
}

/* ===================== PANEL III: FLOWCHART ===================== */
.flowchart {
    margin: 2rem 0;
}

.flow-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.flow-row-offset {
    margin-left: 15%;
}

.flow-box {
    border: 2px solid var(--bureau-green);
    border-radius: 4px;
    padding: 1rem;
    text-align: center;
    min-width: 160px;
    max-width: 200px;
}

.flow-num {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.7rem;
    color: var(--seal-gold);
    display: block;
    margin-bottom: 0.3rem;
}

.flow-text {
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: 0.85rem;
}

.flow-arrow {
    font-family: 'IBM Plex Mono', monospace;
    color: var(--ledger-blue);
    font-size: 1.2rem;
}

.flow-connector {
    text-align: center;
    color: var(--ledger-blue);
    font-size: 1.2rem;
    padding: 0.5rem 0;
    margin-left: 5%;
}

/* Perforation */
.perforation {
    height: 1px;
    margin: 2rem 0;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='2' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='1' cy='1' r='1' fill='%232A2A28'/%3E%3C/svg%3E");
    background-repeat: repeat-x;
    background-size: 8px 2px;
}

.receipt-section {
    background-color: var(--parchment-alt);
    padding: 2rem;
    position: relative;
}

.receipt-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--bureau-green);
    margin-bottom: 1rem;
}

.receipt-text {
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: 0.9rem;
}

.notary-stamp {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    opacity: 0.4;
}

/* ===================== PANEL IV: TERMS ===================== */
.panel-terms {
    position: relative;
}

.terms-layout {
    display: flex;
    gap: 2rem;
}

.terms-body {
    flex: 7;
    text-align: justify;
    hyphens: auto;
}

.terms-body p {
    margin-bottom: 1.2rem;
}

.terms-margin {
    flex: 3;
    position: relative;
}

.margin-note {
    font-family: 'Caveat', cursive;
    font-size: 0.85rem;
    color: var(--faded-violet);
    opacity: 0.6;
    position: absolute;
    left: 0;
    right: 0;
    line-height: 1.3;
}

.notary-large {
    position: absolute;
    bottom: -20px;
    left: -20px;
}

/* ===================== SEAL ROOM ===================== */
.seal-room {
    min-height: 100vh;
    background-color: var(--bureau-green);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 -80px;
    padding: 4rem;
}

.grand-seal {
    width: 60vmin;
    height: 60vmin;
    max-width: 400px;
    max-height: 400px;
}

.seal-ring {
    transition: stroke-dashoffset 3s ease;
}

.seal-ring.drawn {
    stroke-dashoffset: 0;
}

.seal-text {
    transition: opacity 800ms ease;
}

.seal-text.revealed {
    opacity: 1;
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
    .sidebar-index {
        display: none;
    }

    .main-content {
        padding: 2rem 16px;
    }

    .panel-border-inner {
        padding: 20px;
    }

    .panel-columns {
        flex-direction: column;
    }

    .panel-divider {
        width: 100%;
        height: 1px;
        margin: 1.5rem 0;
    }

    .panel-asymmetric {
        flex-direction: column;
    }

    .flow-row {
        flex-direction: column;
    }

    .flow-row-offset {
        margin-left: 0;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }

    .flow-connector {
        margin-left: 0;
    }

    .terms-layout {
        flex-direction: column;
    }

    .terms-margin {
        position: static;
    }

    .margin-note {
        position: static;
        display: block;
        margin-bottom: 0.8rem;
    }

    .seal-room {
        margin: 0 -16px;
    }

    .grand-seal {
        width: 80vmin;
        height: 80vmin;
    }
}