:root {
    --umber: #3B2F2F;
    --brass: #C9A96E;
    --cream: #F2EBD9;
    --ruled: #D4C9A8;
    --ink: #8B7355;
    --vault: #1E1A15;
    --seal: #6B2D2D;
    --counter: #5C4E3C;
    --parchment: #A89880;
}

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

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

body {
    background-color: var(--umber);
    color: var(--umber);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    font-weight: 400;
    line-height: 1.7;
    letter-spacing: 0.01em;
    font-feature-settings: 'onum' 1;
    overflow-x: hidden;
}

/* ===================== SEAL SECTION ===================== */
.seal {
    display: flex;
    min-height: 100vh;
    background-color: var(--umber);
}

.seal-margin {
    display: flex;
    align-items: center;
    justify-content: center;
}

.date-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
}

.date-entry {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--parchment);
    display: block;
}

.seal-content {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hanja-character {
    font-family: 'Zilla Slab', serif;
    font-size: 35vw;
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.02em;
    color: var(--brass);
    user-select: none;
}

/* ===================== MARGIN / CONTENT COLUMNS ===================== */
.margin-column {
    flex: 0 0 38%;
    width: 38%;
    padding: 2rem 1.5rem;
    position: relative;
}

.content-column {
    flex: 0 0 62%;
    width: 62%;
    padding: 2rem 3rem;
    position: relative;
}

/* ===================== LEDGER SPREAD ===================== */
.ledger-spread {
    display: flex;
    min-height: 250vh;
    background-color: var(--cream);
    position: relative;
}

.ledger-margin {
    background-color: var(--cream);
    position: relative;
}

.ledger-margin::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background-color: var(--ruled);
}

.annotation {
    font-family: 'Caveat', cursive;
    font-size: 0.85rem;
    font-weight: 400;
    line-height: 1.4;
    color: var(--ink);
    font-variant-ligatures: common-ligatures;
    max-width: 90%;
    position: relative;
}

.ledger-content {
    background-color: var(--cream);
    background-image: repeating-linear-gradient(
        transparent,
        transparent 27px,
        var(--ruled) 27px,
        var(--ruled) 28px
    );
    padding: 4rem 3rem;
    position: relative;
}

/* Paper foxing spots */
.ledger-content::before {
    content: '';
    position: absolute;
    top: 15%;
    left: 20%;
    width: 50px;
    height: 50px;
    background: radial-gradient(circle, var(--ruled) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.ledger-content::after {
    content: '';
    position: absolute;
    top: 55%;
    right: 15%;
    width: 50px;
    height: 50px;
    background: radial-gradient(circle, var(--ruled) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.ledger-page {
    margin-bottom: 8rem;
    position: relative;
}

.ledger-page::before {
    content: '';
    position: absolute;
    bottom: -4rem;
    left: 0;
    right: 0;
    height: 50px;
    width: 50px;
    margin-left: 60%;
    background: radial-gradient(circle, var(--ruled) 0%, transparent 70%);
    opacity: 0.25;
    pointer-events: none;
}

.section-heading {
    font-family: 'Zilla Slab', serif;
    font-size: clamp(2.5rem, 6vw, 6rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--umber);
    margin-bottom: 2rem;
}

.ledger-page p {
    margin-bottom: 1.5rem;
    color: var(--umber);
}

/* ===================== VAULT ===================== */
.vault {
    min-height: 150vh;
    background-color: var(--vault);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.vault-content {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15vh 2rem;
}

.vault-quote {
    font-family: 'Zilla Slab', serif;
    font-size: clamp(2.5rem, 5vw, 5rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--brass);
    max-width: 70%;
    text-align: center;
    position: relative;
    z-index: 1;
}

.coin {
    position: absolute;
    width: 12px;
    height: 12px;
    border: 1px solid var(--brass);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 2.5s cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

.coin.visible {
    opacity: 1;
}

/* ===================== RECEIPT SECTION ===================== */
.receipt-section {
    display: flex;
    min-height: 150vh;
    background-color: var(--cream);
    position: relative;
}

.receipt-margin {
    background-color: var(--cream);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 4rem;
    position: relative;
}

.receipt-margin::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background-color: var(--ruled);
}

.wax-seal {
    display: block;
}

.receipt-content {
    padding: 4rem 3rem;
    background-color: var(--cream);
    background-image: repeating-linear-gradient(
        transparent,
        transparent 27px,
        var(--ruled) 27px,
        var(--ruled) 28px
    );
}

.receipt-block {
    max-width: 380px;
    border-top: 2px dashed var(--ink);
    padding: 2rem 0 3rem 0;
    margin-bottom: 3rem;
}

.receipt-title {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--counter);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.receipt-block p {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--counter);
    line-height: 1.7;
}

/* ===================== CLOSING ENTRY ===================== */
.closing-entry {
    display: flex;
    min-height: 100vh;
    background-color: var(--cream);
    position: relative;
    overflow: hidden;
}

.closing-margin {
    background-color: var(--cream);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: flex-basis 1.2s ease, width 1.2s ease;
    z-index: 2;
}

.closing-content {
    background-color: var(--cream);
    transition: opacity 1.2s ease, flex-basis 1.2s ease, width 1.2s ease;
    z-index: 1;
}

.closing-entry.expanded .closing-margin {
    flex-basis: 100%;
    width: 100%;
}

.closing-entry.expanded .closing-content {
    flex-basis: 0%;
    width: 0%;
    opacity: 0;
    overflow: hidden;
}

.closing-text {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

.closing-annotation {
    font-family: 'Caveat', cursive;
    font-size: 1.2rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--ink);
    font-variant-ligatures: common-ligatures;
    margin-bottom: 2rem;
}

.closing-rule {
    border: none;
    border-top: 1px solid var(--ruled);
    margin: 2rem auto;
    width: 60%;
}

.closing-domain {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--parchment);
    display: block;
    margin-top: 1rem;
}

.closing-placeholder {
    min-height: 100vh;
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 768px) {
    .margin-column {
        flex: 0 0 30%;
        width: 30%;
        padding: 1rem;
    }

    .content-column {
        flex: 0 0 70%;
        width: 70%;
        padding: 1.5rem;
    }

    .hanja-character {
        font-size: 45vw;
    }

    .vault-quote {
        max-width: 90%;
        font-size: clamp(1.5rem, 5vw, 3rem);
    }

    .receipt-block {
        max-width: 100%;
    }
}