/* ============================================================
   ELIZABETH & JOHNATHAN BUTLER — WEDDING SITE
   Theme: Library Card  |  Style: Old Internet / Late 90s Web
   ============================================================ */

/* --- VARIABLES -------------------------------------------- */
:root {
    --page-bg:     #d8cfb8;
    --cream:       #f5f0e0;
    --paper:       #faf6ea;
    --paper-edge:  #d4c898;
    --green-xdark: #0d220a;
    --green-dark:  #1a3d0a;
    --green:       #2d5c1a;
    --green-light: #4a8c2f;
    --green-pale:  #ddeedd;
    --burgundy:    #7a1a2a;
    --gold:        #b8862a;
    --gold-light:  #d4a840;
    --brown:       #4a2d0a;
    --brown-mid:   #6b4226;
    --brown-light: #9a7050;
    --navy:        #1a2a5a;
    --stamp-red:   #8b1a1a;
    --text:        #1a1210;
    --text-faded:  #6a5030;
    --link:        #000080;
    --link-vis:    #551a8b;

    --font-serif:  Georgia, 'Times New Roman', serif;
    --font-mono:   'Courier New', Courier, monospace;
    --font-term:   'VT323', monospace;        /* ASCII art & book spines */
    --font-type:   'Special Elite', cursive;  /* card typewriter content */

    --card-shadow: 3px 3px 0 var(--brown-mid);
}

/* --- RESET ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { overflow-x: hidden; }

/* --- BODY -------------------------------------------------- */
body {
    background-color: var(--page-bg);
    /* Subtle dot grid — evokes the tiled GIF backgrounds of old */
    background-image: radial-gradient(
        circle, rgba(0,0,0,0.09) 1px, transparent 1px
    );
    background-size: 8px 8px;
    color: var(--text);
    font-family: var(--font-serif);
    font-size: 17px;
    line-height: 1.7;
}

/* --- HEADER ----------------------------------------------- */
header {
    background: var(--green-dark);
    border-bottom: 5px double var(--gold); /* double = very 90s */
    padding: 20px 20px 0;
    text-align: center;
}

.ascii-banner {
    display: inline-block;
    text-align: left;
    font-family: var(--font-term);
    font-size: 22px;
    line-height: 1.5;
    color: var(--gold);
    text-shadow: 0 0 10px rgba(196,149,42,0.4);
    margin-bottom: 12px;
    white-space: pre;
    max-width: 100%;
    overflow: hidden;
}

.site-title {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: bold;
    font-size: clamp(22px, 4vw, 40px);
    color: var(--cream);
    letter-spacing: 3px;
    text-shadow: 2px 2px 0 var(--brown);
    margin-bottom: 6px;
}

.amp { color: var(--gold-light); font-style: normal; }

.site-subtitle {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--gold-light);
    letter-spacing: 7px;
    margin-bottom: 24px;
}

/* --- BOOKSHELF NAV ---------------------------------------- */
.bookshelf {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 32px;
}

.books {
    list-style: none;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 6px;
    padding: 0;
}

.book {
    display: flex;
    width: 60px;
    min-height: 160px;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-lr;
    transform: rotate(180deg);
    font-family: var(--font-term); /* VT323: terminal, not game-y */
    font-size: 17px;               /* VT323 needs bigger sizes to read well */
    letter-spacing: 3px;
    text-decoration: none;
    padding: 14px 6px;
    cursor: pointer;
    position: relative;
    transition: margin-bottom 0.12s ease, filter 0.12s ease; /* modern touch */
}

.book span {
    writing-mode: vertical-lr;
    transform: rotate(180deg);
}

.book:hover, .book:focus {
    margin-bottom: 14px; /* the lift the user likes */
    filter: brightness(1.25);
    outline: none;
}

.book::before {
    content: '';
    position: absolute;
    inset: 0;
    box-shadow:
        inset -5px 0 0 rgba(0,0,0,0.35),
        inset  3px 0 0 rgba(255,255,255,0.12);
    pointer-events: none;
}

.book::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 4px;
    right: -4px;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: -1;
}

.book--green    { background: linear-gradient(90deg,#1d4012,#2d5a1b 35%,#3a7020 65%,#2d5a1b); color:#c4e88a; }
.book--burgundy { background: linear-gradient(90deg,#4a0f1c,#6b1a2a 35%,#7d2035 65%,#6b1a2a); color:#f0c0c0; }
.book--brown    { background: linear-gradient(90deg,#2a1505,#5c3010 35%,#6b3a15 65%,#5c3010); color:#e8c88a; }
.book--navy     { background: linear-gradient(90deg,#0f1e35,#1a2a4a 35%,#233560 65%,#1a2a4a); color:#a8c4e8; }
.book--olive    { background: linear-gradient(90deg,#262606,#3d3d0a 35%,#4f4f10 65%,#3d3d0a); color:#d4d890; }
.book--teal     { background: linear-gradient(90deg,#073030,#0d4a4a 35%,#116060 65%,#0d4a4a); color:#a8dede; }
.book--gold     { background: linear-gradient(90deg,#6b4512,#9a6a1f 35%,#b8862a 65%,#9a6a1f); color:#fff0b8; }

.shelf-board {
    height: 18px;
    background: linear-gradient(to bottom, var(--brown-mid), var(--brown), #1a0a02);
    border-top: 4px solid var(--gold);
    box-shadow: 0 5px 12px rgba(0,0,0,0.7);
    margin: 0 -32px;
}

/* --- MAIN -------------------------------------------------- */
main {
    max-width: 860px;
    margin: 0 auto;
    padding: 48px 20px;
}

.section { margin-bottom: 72px; }

.section-heading {
    font-family: var(--font-serif);
    font-size: 26px;
    font-style: italic;
    font-weight: bold;
    color: var(--green-dark);
    text-align: center;
    letter-spacing: 2px;
    margin-bottom: 28px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--green-dark);
}

.divider {
    font-family: var(--font-term);
    font-size: 20px;
    color: var(--brown-mid);
    text-align: center;
    margin: 0 0 72px;
    letter-spacing: 2px;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
}

/* --- LIBRARY CARD BASE ------------------------------------- */
.library-card {
    background: var(--paper);
    border: 3px ridge var(--brown-mid); /* ridge = classic 90s bevel */
    padding: 28px 28px 24px;
    position: relative;
    box-shadow: var(--card-shadow);
}

/* Inner rule — evokes actual library card printing */
.library-card::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 1px solid rgba(139,100,50,0.18);
    pointer-events: none;
}

/* --- CARD SHARED PARTS ------------------------------------- */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 14px;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--paper-edge);
}

.card-title {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--green-dark);
    text-align: center;
    margin-bottom: 22px;
}

.card-fields { display: flex; flex-direction: column; gap: 14px; }

.card-field {
    display: flex;
    gap: 10px;
    align-items: baseline;
}

.card-field.vertical {
    flex-direction: column;
    gap: 3px;
}

.field-key {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-faded);
    letter-spacing: 2px;
    white-space: nowrap;
    min-width: 90px;
    text-transform: uppercase;
}

.field-val {
    font-family: var(--font-type);
    font-size: 20px;
    color: var(--text);
    border-bottom: 1px solid var(--paper-edge);
    flex: 1;
    padding-bottom: 1px;
}

.field-val.faded { color: var(--text-faded); font-style: italic; }

.card-footer-note {
    margin-top: 20px;
    padding-top: 12px;
    border-top: 1px solid var(--paper-edge);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-faded);
    text-align: center;
    letter-spacing: 1px;
}

/* --- STAMP ------------------------------------------------- */
.stamp {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    border: 3px solid var(--stamp-red);
    padding: 6px 10px;
    transform: rotate(-6deg);
    line-height: 1.3;
}

.stamp-top {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    color: var(--stamp-red);
}

.stamp-bot {
    font-family: var(--font-mono);
    font-size: 8px;
    color: var(--stamp-red);
    letter-spacing: 2px;
}

/* --- DEWEY DECIMAL LABEL ----------------------------------- */
.dewey-label { text-align: right; }

.dewey-num {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: bold;
    color: var(--text);
}

.dewey-sub {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-faded);
}

/* --- WELCOME CARD ------------------------------------------ */
.welcome-card { max-width: 500px; margin: 0 auto; }

/* --- DETAILS GRID ------------------------------------------ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.detail-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--green-dark);
    padding-bottom: 10px;
    margin-bottom: 14px;
    border-bottom: 1px solid var(--paper-edge);
}

.detail-card .field-val { font-size: 17px; }

/* --- CHECKOUT / OUR STORY ---------------------------------- */
.checkout-card {
    max-width: 580px;
    margin: 0 auto;
    background: var(--cream);
    border: 3px ridge var(--brown-mid);
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.checkout-header {
    background: var(--green);
    color: var(--cream);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.checkout-title {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.checkout-names {
    font-family: var(--font-type);
    font-size: 18px;
}

/* Actual <table> — authentic old web structure */
.checkout-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-type);
    font-size: 19px;
}

.checkout-table thead th {
    background: var(--paper-edge);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-faded);
    padding: 6px 20px;
    text-align: left;
    border-bottom: 1px solid var(--brown-light);
}

.checkout-table tbody tr {
    border-bottom: 1px solid rgba(139,100,50,0.18);
}

.checkout-table tbody td { padding: 10px 20px; }

.checkout-table tbody td:first-child { width: 170px; }

.checkout-table tbody tr.faded-row {
    color: var(--text-faded);
    font-style: italic;
}

.checkout-table tbody tr.finale-row td {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    color: var(--burgundy);
    letter-spacing: 1px;
    padding: 14px 20px;
    background: rgba(107,26,42,0.07);
    border-bottom: none;
}

/* --- RSVP CARD --------------------------------------------- */
.rsvp-card { max-width: 500px; margin: 0 auto; }

.rsvp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--paper-edge);
}

.rsvp-card-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--green-dark);
}

.due-box {
    border: 2px solid var(--text);
    padding: 4px 12px;
    text-align: center;
}

.due-label {
    font-family: var(--font-mono);
    font-size: 8px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-faded);
}

.due-date {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    color: var(--stamp-red);
}

/* --- RSVP FORM --------------------------------------------- */
.rsvp-form { display: flex; flex-direction: column; gap: 22px; }

.form-field { display: flex; flex-direction: column; gap: 8px; }

.form-field > label,
.form-label {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-faded);
}

/* Classic 90s input — full inset border, not the fancy bottom-line style */
.form-field input[type="text"],
.form-field input[type="number"] {
    width: 100%;
    background: #fff;
    border: 2px inset var(--brown-light); /* inset = classic form field */
    font-family: var(--font-type);
    font-size: 20px;
    color: var(--text);
    padding: 6px 8px;
    outline: none;
}

.form-field input[type="text"]:focus,
.form-field input[type="number"]:focus {
    background: #fffff8;
    border-color: var(--green-dark);
}

.radio-group { display: flex; flex-direction: column; gap: 10px; }

.radio-opt {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1px;
    color: var(--text);
    cursor: pointer;
}

.radio-opt input[type="radio"] { position: absolute; opacity: 0; width: 0; height: 0; }

.radio-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border: 2px inset var(--brown-light);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: bold;
    color: transparent;
    background: #fff;
    flex-shrink: 0;
    transition: color 0.1s, border-color 0.1s, background 0.1s;
}

.radio-btn::before { content: attr(data-label); }

.radio-opt:has(input:checked) .radio-btn {
    color: var(--cream);
    border-color: var(--green);
    background: var(--green);
}

/* Classic bevel button — the outset/inset press is pure 90s */
.submit-btn {
    margin-top: 8px;
    padding: 10px 20px;
    background: var(--green-pale);
    color: var(--green-dark);
    border: 3px outset var(--green);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
}

.submit-btn:hover { filter: brightness(1.08); }

.submit-btn:active {
    border-style: inset;
    transform: translate(1px, 1px);
}

/* --- FAQ CARD ---------------------------------------------- */
.faq-card { max-width: 600px; margin: 0 auto; }

.faq-list { display: flex; flex-direction: column; gap: 0; }

.faq-list dt {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: bold;
    color: var(--green-dark);
    letter-spacing: 1px;
    padding: 14px 0 4px;
    border-top: 1px solid var(--paper-edge);
}

.faq-list dt:first-child { border-top: none; padding-top: 0; }

.faq-list dd {
    font-family: var(--font-type);
    font-size: 19px;
    color: var(--text-faded);
    font-style: italic;
    padding: 0 0 10px 16px;
}

/* --- REGISTRY CARD ----------------------------------------- */
.registry-card { max-width: 500px; margin: 0 auto; }

.registry-links {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.registry-link {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--link);
    text-decoration: underline; /* classic web links are underlined */
    letter-spacing: 1px;
    padding: 10px 4px;
    border-bottom: 1px solid var(--paper-edge);
    transition: color 0.1s, padding-left 0.12s;
}

.registry-link:visited { color: var(--link-vis); }
.registry-link:hover   { color: var(--burgundy); padding-left: 10px; text-decoration: underline; }

.reg-arrow { color: var(--gold); font-size: 14px; text-decoration: none; }

/* --- FOOTER ------------------------------------------------ */
footer {
    background: var(--green-dark);
    border-top: 5px double var(--gold);
    padding: 24px 20px;
    text-align: center;
}

footer .ascii-banner { font-size: 20px; }

.footer-notes {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--gold-light);
    opacity: 0.65;
    margin-top: 12px;
    letter-spacing: 1px;
}

/* --- RESPONSIVE -------------------------------------------- */
@media (max-width: 640px) {
    .book             { width: 46px; min-height: 120px; font-size: 14px; letter-spacing: 2px; }
    .ascii-banner     { font-size: 14px; }
    .site-title       { font-size: 20px; }
    .section-heading  { font-size: 20px; }
    .cards-grid       { grid-template-columns: 1fr; }
    .checkout-table tbody td:first-child { width: 120px; }
    main              { padding: 32px 14px; }
}

@media (max-width: 400px) {
    .books { gap: 3px; }
    .book  { width: 38px; font-size: 12px; }
}

/* ============================================================
   PASSCODE GATE
   ============================================================ */

/* Lock body scroll while the gate is showing */
body.locked { overflow: hidden; height: 100vh; }

/* Instantly hide the gate on repeat visits (set by inline head script) */
html.already-unlocked #gate { display: none !important; }

.gate {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    perspective: 2000px;
    transition: opacity 0.5s ease 0.2s;
}

.gate.unlocked {
    opacity: 0;
    pointer-events: none;
}

/* Solid backdrop hides the content until the doors start to open */
.gate-backdrop {
    position: absolute;
    inset: 0;
    background: var(--green-xdark);
    background-image:
        radial-gradient(ellipse at center, rgba(196,134,42,0.14) 0%, transparent 65%),
        radial-gradient(circle, rgba(0,0,0,0.22) 1px, transparent 1px);
    background-size: 100% 100%, 8px 8px;
    transition: opacity 0.9s ease 0.1s;
}

.gate.opening .gate-backdrop { opacity: 0; }

.gate-stage {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    max-width: 100%;
    transform-style: preserve-3d;
}

.gate-banner {
    font-family: var(--font-term);
    font-size: 22px;
    line-height: 1.5;
    color: var(--gold);
    text-shadow: 0 0 10px rgba(196,149,42,0.5);
    text-align: center;
    white-space: pre;
    margin: 0;
    transition: opacity 0.6s ease;
}

.gate.opening .gate-banner { opacity: 0; }

/* ---------- Bookshelf ---------- */
.gate-shelf {
    position: relative;
    width: min(820px, 95vw);
    height: min(440px, 68vh);
    transform-style: preserve-3d;
}

.gate-half {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    background:
        repeating-linear-gradient(90deg,
            transparent 0, transparent 26px,
            rgba(0,0,0,0.12) 26px, rgba(0,0,0,0.12) 28px),
        linear-gradient(to bottom, #4a2d0a 0%, #3d2506 20%, #2a1505 50%, #3d2506 80%, #4a2d0a 100%);
    border: 4px solid var(--gold);
    box-shadow: inset 0 0 24px rgba(0,0,0,0.6);
    display: flex;
    flex-direction: column;
    padding: 14px 8px 0;
    transition: transform 1.1s cubic-bezier(0.72, 0, 0.72, 0.3);
    backface-visibility: hidden;
}

.gate-half--left  { left: 0;  transform-origin: left center;  border-right-width: 2px; }
.gate-half--right { right: 0; transform-origin: right center; border-left-width: 2px;  }

.gate.opening .gate-half--left  { transform: rotateY(-108deg); }
.gate.opening .gate-half--right { transform: rotateY(108deg);  }

.shelf-row {
    flex: 1;
    display: flex;
    gap: 4px;
    justify-content: center;
    align-items: flex-end;
    padding: 10px 4px 4px;
}

.shelf-plank {
    flex-shrink: 0;
    height: 14px;
    background: linear-gradient(to bottom, #6b4226 0%, #3d2506 50%, #1a0a02 100%);
    border-top: 3px solid var(--gold);
    margin: 0 -4px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.6);
}

/* ---------- Gate books (reuse .book--color classes for colors) ---------- */
.gate-book {
    width: 38px;
    min-height: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-lr;
    transform: rotate(180deg);
    font-family: var(--font-term);
    font-size: 15px;
    letter-spacing: 2px;
    padding: 10px 4px;
    position: relative;
    flex-shrink: 0;
}

.gate-book span {
    writing-mode: vertical-lr;
    transform: rotate(180deg);
}

.gate-book::before {
    content: '';
    position: absolute;
    inset: 0;
    box-shadow:
        inset -4px 0 0 rgba(0,0,0,0.35),
        inset  2px 0 0 rgba(255,255,255,0.12);
    pointer-events: none;
}

/* Key book: highlighted slightly and animates out */
.gate-book--key {
    outline: 2px solid rgba(212, 168, 64, 0.6);
    outline-offset: -2px;
    transition:
        transform 0.65s cubic-bezier(0.5, 0, 0.5, 1),
        opacity   0.5s  ease 0.2s;
}

.gate.sliding .gate-book--key {
    /* rotate(180deg) is already on the book; compose with translate.
       In rotated space, -x is screen +x and -y is screen +y.
       So translate(-10px, -80px) = "10px right, 80px down" visually. */
    transform: rotate(180deg) translate(-14px, -90px);
    opacity: 0;
}

/* ---------- Gate form (positioned over the shelf center) ---------- */
.gate-form {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
    background: var(--paper);
    border: 3px ridge var(--brown-mid);
    box-shadow:
        var(--card-shadow),
        0 0 50px rgba(196, 134, 42, 0.35);
    padding: 24px 30px 18px;
    width: min(340px, 92%);
    text-align: center;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.gate.closing-form .gate-form {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.92);
    pointer-events: none;
}

.gate-form-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: bold;
    color: var(--green-dark);
    letter-spacing: 2px;
    text-transform: uppercase;
    padding-bottom: 8px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--paper-edge);
}

.gate-form-sub {
    display: block;
    font-family: var(--font-mono);
    font-size: 9.5px;
    color: var(--text-faded);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.gate-form-input {
    width: 100%;
    background: #fff;
    border: 2px inset var(--brown-light);
    font-family: var(--font-type);
    font-size: 20px;
    color: var(--text);
    padding: 6px 8px;
    outline: none;
    text-align: center;
    letter-spacing: 3px;
    margin-bottom: 14px;
}

.gate-form-input:focus {
    border-color: var(--green-dark);
    background: #fffff8;
}

.gate-form-input:disabled { opacity: 0.6; }

.gate-form-btn {
    padding: 9px 22px;
    background: var(--green-pale);
    color: var(--green-dark);
    border: 3px outset var(--green);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
}

.gate-form-btn:hover  { filter: brightness(1.08); }
.gate-form-btn:active { border-style: inset; transform: translate(1px, 1px); }

.gate-hint {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--stamp-red);
    margin-top: 10px;
    min-height: 14px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.gate-hint.ok { color: var(--green); }

/* Shake form on wrong passcode — preserves the centering transform */
@keyframes gate-shake {
    0%, 100%                  { transform: translate(-50%, -50%); }
    10%, 30%, 50%, 70%, 90%   { transform: translate(calc(-50% - 8px), -50%); }
    20%, 40%, 60%, 80%        { transform: translate(calc(-50% + 8px), -50%); }
}

.gate-form.shake { animation: gate-shake 0.5s ease-in-out; }

/* ---------- Gate responsive ---------- */
@media (max-width: 680px) {
    .gate-shelf   { height: min(520px, 78vh); }
    .gate-book    { width: 30px; min-height: 105px; font-size: 12px; letter-spacing: 1px; }
    .gate-banner  { font-size: 14px; }
    .gate-form    { width: min(300px, 92%); padding: 20px 22px 14px; }
}

@media (max-width: 440px) {
    .gate-book    { width: 26px; min-height: 92px; font-size: 10px; padding: 8px 3px; }
    .shelf-row    { gap: 3px; padding: 6px 2px 2px; }
}