/* ==========================================================================
   HAMTEST.RU — Radio Operations Bulletin
   Cream paper · ink · broadcast amber
   ========================================================================== */

:root {
    --paper:        #f1ebde;
    --paper-dim:    #e8dfc8;
    --paper-deep:   #ddd1b3;
    --ink:          #1a1612;
    --ink-soft:     #4a4135;
    --ink-faint:    #8a7e6a;
    --rule:         rgba(26, 22, 18, 0.10);
    --rule-strong:  rgba(26, 22, 18, 0.28);

    --signal:       #cf3f0a;
    --signal-glow:  rgba(207, 63, 10, 0.18);
    --signal-dim:   rgba(207, 63, 10, 0.08);

    --pass:         #2f5d27;
    --pass-bg:      rgba(47, 93, 39, 0.10);
    --warn:         #9a6a1e;
    --warn-bg:      rgba(154, 106, 30, 0.10);
    --fail:         #7a1f12;
    --fail-bg:      rgba(122, 31, 18, 0.08);

    --display: 'Unbounded', system-ui, sans-serif;
    --mono:    'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

    --s1: .25rem;  --s2: .5rem;  --s3: 1rem;   --s4: 1.5rem;
    --s5: 2rem;    --s6: 3rem;   --s7: 4rem;   --s8: 6rem;

    --container: 68rem;
}

/* ----- Reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--mono);
    font-size: 15px;
    line-height: 1.6;
    font-variant-numeric: tabular-nums;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle paper grain */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.045;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
    mix-blend-mode: multiply;
}

img { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; }

/* ----- Typography --------------------------------------------------------- */
h1, h2, h3, h4 {
    font-family: var(--display);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.025em;
    margin: 0;
    color: var(--ink);
}
h1 { font-size: clamp(2.5rem, 6vw, 4.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); letter-spacing: -0.015em; }
h3 {
    font-family: var(--mono);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
}

p { margin: 0 0 var(--s3); text-wrap: pretty; }
b, strong { font-weight: 600; color: var(--ink); }

a {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--rule-strong);
    text-underline-offset: 0.25em;
    transition: color 140ms, text-decoration-color 140ms;
}
a:hover {
    color: var(--signal);
    text-decoration-color: var(--signal);
}

::selection { background: var(--signal); color: var(--paper); }

/* ----- Layout ------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--s4);
}

main.wrapper {
    min-height: 60vh;
    padding-bottom: var(--s7);
}

/* ----- Header ------------------------------------------------------------- */
header {
    border-bottom: 1px solid var(--rule-strong);
    margin-bottom: var(--s6);
    padding: var(--s4) 0 0;
}

.brand-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--s4);
    flex-wrap: wrap;
    padding-bottom: var(--s2);
}

.brand-mark {
    font-family: var(--display);
    font-weight: 900;
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    letter-spacing: -0.03em;
    color: var(--ink);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
}
.brand-mark:hover { color: var(--ink); }

.brand-mark::before {
    content: "";
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--signal);
    box-shadow: 0 0 0.5rem var(--signal-glow), 0 0 0 2px var(--paper);
    animation: pulse 1.6s ease-in-out infinite;
    flex-shrink: 0;
}
.brand-mark .tld { color: var(--signal); }

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.35; transform: scale(0.75); }
}

.brand-meta {
    font-family: var(--mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--ink-faint);
    text-align: right;
}

nav.primary {
    display: flex;
    gap: 0;
    flex-wrap: wrap;
    border-top: 1px dashed var(--rule);
    padding-top: var(--s2);
    margin-top: var(--s2);
}
nav.primary a {
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-soft);
    text-decoration: none;
    padding: 0.45rem 0.85rem 0.45rem 0;
    margin-right: var(--s3);
    border-bottom: 2px solid transparent;
    transition: color 140ms, border-color 140ms;
}
nav.primary a:hover { color: var(--signal); }
nav.primary a.is-active {
    color: var(--ink);
    border-bottom-color: var(--signal);
}

/* ----- Footer ------------------------------------------------------------- */
footer.footer {
    position: static;
    width: auto;
    line-height: inherit;
    margin-top: var(--s7);
    padding: var(--s4) 0;
    border-top: 1px solid var(--rule-strong);
    font-family: var(--mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
}
footer.footer .container {
    display: flex;
    justify-content: space-between;
    gap: var(--s3);
    flex-wrap: wrap;
}
footer.footer p { margin: 0; }
footer.footer::before {
    display: block;
    /* Within letter: regular space.  Between letters: em-space (\2003).
       Between words: em-space + slash + em-space.  Requires proportional
       font — in a monospace face every space collapses to one char-width. */
    content: "– – · · ·\2003 · · · – –\2003 – · – · – –\2003 /\2003 – – · –\2003 · – ·\2003 – – · ·\2003 · · – – · ·\2003 /\2003 – · – ·\2003 – – · –\2003 /\2003 – · – ·\2003 – – · –\2003 /\2003 – · ·\2003 ·\2003 /\2003 · – ·\2003 · – – – –\2003 – · – ·\2003 – · ·\2003 · · ·\2003 /\2003 · – – ·\2003 · · ·\2003 ·\2003 /\2003 – · –";
    color: var(--rule-strong);
    font-family: var(--display);
    font-size: 0.75rem;
    letter-spacing: 0;
    max-width: var(--container);
    margin: 0 auto var(--s2);
    padding: 0 var(--s4);
    box-sizing: border-box;
    overflow: hidden;
    white-space: nowrap;
}

/* ----- Index / Hero ------------------------------------------------------- */
.hero {
    margin: var(--s5) 0 var(--s6);
}

.eyebrow {
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.28em;
    color: var(--signal);
    margin-bottom: var(--s3);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.eyebrow::before {
    content: "";
    width: 1.5rem;
    height: 1px;
    background: var(--signal);
}

.hero-title {
    margin-bottom: var(--s4);
    text-wrap: balance;
}
.hero-title .accent { color: var(--signal); font-style: normal; }

.hero-lede {
    max-width: 52ch;
    font-size: 1.0625rem;
    line-height: 1.55;
    color: var(--ink-soft);
}

.intro-block {
    margin: var(--s5) 0 var(--s6);
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--s6);
    align-items: start;
}
.intro-block .source {
    border-left: 2px solid var(--signal);
    padding: var(--s2) 0 var(--s2) var(--s4);
    font-size: 0.9375rem;
    color: var(--ink-soft);
}
.intro-block .source b { color: var(--ink); }
.intro-block .note {
    font-size: 0.9375rem;
    color: var(--ink-soft);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s3);
}
.intro-block .note p { margin: 0; }

.author-sign {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.7rem;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-soft);
    border: 1px solid var(--ink);
    background: var(--paper);
    white-space: nowrap;
    width: max-content;
}
.author-sign b {
    color: var(--signal);
    font-weight: 700;
    letter-spacing: 0.1em;
}

@media (max-width: 800px) {
    .intro-block { grid-template-columns: 1fr; gap: var(--s4); }
}

/* ----- Category grid ------------------------------------------------------ */
.cat-section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin: var(--s6) 0 var(--s3);
    padding-bottom: var(--s2);
    border-bottom: 1px solid var(--ink);
    gap: var(--s3);
}
.cat-section-head h2 {
    font-size: clamp(1.25rem, 2.2vw, 1.625rem);
}
.cat-section-head .count {
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-faint);
}

.cat-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    margin: 0 0 var(--s6);
    border-top: 1px solid var(--rule-strong);
    border-left: 1px solid var(--rule-strong);
}
@media (max-width: 640px) {
    .cat-grid { grid-template-columns: minmax(0, 1fr); }
}

.cat {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--s3);
    padding: var(--s4);
    border-right: 1px solid var(--rule-strong);
    border-bottom: 1px solid var(--rule-strong);
    background: var(--paper);
    color: var(--ink);
    overflow: hidden;
    transition: color 220ms ease;
    /* Hard reset of all decoration sub-properties (Safari leaves underline
       metrics reserved even when decoration-line is none, which causes
       sub-pixel text shifts on state change) */
    text-decoration-line: none;
    text-decoration-thickness: 0;
    text-underline-offset: 0;
}

.cat > * {
    position: relative;
    z-index: 1;
    /* Promote each text element to its own composite layer so the overlay
       repaint cannot trigger sub-pixel re-rasterisation of glyphs */
    transform: translateZ(0);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.cat::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--ink);
    transform: translateX(-101%);
    transition: transform 420ms cubic-bezier(.7,0,.25,1);
    z-index: 0;
    pointer-events: none;
    will-change: transform;
}
.cat:hover { color: var(--paper); }
.cat:hover::after { transform: translateX(0); }
.cat:hover .cat-tag,
.cat:hover .cat-desc { color: var(--paper-dim); }
.cat:hover .cat-cta { color: var(--paper); border-color: var(--paper); }
.cat:hover .cat-cta::after { transform: translateX(0.35rem); color: var(--signal); }
.cat:hover .cat-num { color: var(--signal); }

.cat-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--s2);
    padding-bottom: var(--s3);
    border-bottom: 1px dashed currentColor;
    opacity: 1;
}
.cat-num {
    font-family: var(--display);
    font-weight: 900;
    font-size: clamp(3rem, 7vw, 4.25rem);
    line-height: 0.85;
    letter-spacing: -0.045em;
    color: var(--ink);
    transition: color 220ms ease;
}
.cat-tag {
    font-family: var(--mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-soft);
    text-align: right;
    line-height: 1.4;
}
.cat-tag .freq {
    display: block;
    color: var(--signal);
    font-weight: 700;
    margin-bottom: 2px;
}

.cat-title {
    font-family: var(--display);
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.15;
    margin: 0;
    color: inherit;
}
.cat-desc {
    font-size: 0.875rem;
    line-height: 1.55;
    color: var(--ink-soft);
    margin: 0;
    flex: 1;
    transition: color 220ms ease;
}

.cat-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s2);
    margin: 0;
    padding-top: var(--s3);
    border-top: 1px dashed currentColor;
    opacity: 0.9;
}
.cat-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}
.cat-stat dt {
    font-family: var(--mono);
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
    margin: 0;
    transition: color 220ms ease;
}
.cat-stat dd {
    font-family: var(--display);
    font-weight: 700;
    font-size: 1.125rem;
    line-height: 1;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin: 0;
    font-variant-numeric: tabular-nums;
    transition: color 220ms ease;
}
.cat:hover .cat-stat dt { color: var(--paper-dim); }
.cat:hover .cat-stat dd { color: var(--paper); }

.cat-cta {
    margin-top: auto;
    padding-top: var(--s3);
    border-top: 1px solid var(--ink);
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--ink);
    transition: color 220ms ease, border-color 220ms ease;
}
.cat-cta::after {
    content: "→";
    transition: transform 220ms ease;
}

/* ----- Exam page ---------------------------------------------------------- */
.exam-head {
    margin-bottom: var(--s5);
}
.exam-title {
    text-wrap: balance;
    margin-bottom: var(--s3);
    font-size: clamp(2rem, 4.5vw, 3.25rem);
}
.exam-title .num {
    color: var(--signal);
    font-style: normal;
}
.exam-blurb {
    max-width: 60ch;
    color: var(--ink-soft);
    margin-bottom: var(--s4);
    font-size: 0.9375rem;
}
.exam-blurb.italic {
    border-left: 2px solid var(--signal);
    padding: var(--s2) 0 var(--s2) var(--s3);
    font-style: normal;
    font-family: var(--display);
    font-weight: 500;
    color: var(--ink);
    font-size: 1rem;
}

.exam-instr {
    font-size: 0.875rem;
    color: var(--ink-soft);
    margin: var(--s4) 0 var(--s5);
    padding: var(--s3);
    border: 1px dashed var(--rule-strong);
    background: var(--paper-dim);
}

/* HUD progress (sticky) */
.hud {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(241, 235, 222, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--rule-strong);
    padding: 0.65rem 0;
    margin: var(--s4) 0 var(--s5);
}
.hud-row {
    display: flex;
    align-items: center;
    gap: var(--s3);
    font-family: var(--mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--ink-soft);
}
.hud-tx {
    color: var(--signal);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 600;
}
.hud-tx::before {
    content: "";
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--signal);
    box-shadow: 0 0 0.4rem var(--signal-glow);
    animation: blink 1.4s ease-in-out infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.25; }
}
.hud-bar {
    flex: 1;
    height: 2px;
    background: var(--rule);
    position: relative;
    overflow: hidden;
    min-width: 4rem;
}
.hud-bar-fill {
    position: absolute;
    inset: 0 100% 0 0;
    background: var(--signal);
    transition: right 280ms ease;
}
.hud-count {
    color: var(--ink);
    font-weight: 600;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
.hud-time {
    font-family: var(--mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: 0.06em;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    padding: 0.15rem 0.55rem;
    border: 1px solid var(--ink);
    background: var(--paper);
    position: relative;
    overflow: hidden;
    transition: color 200ms, border-color 200ms, background 200ms;
    animation: time-breathe 2.6s ease-in-out infinite;
}
.hud-time::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: -3px;
    width: 2px;
    background: var(--signal);
    box-shadow: 0 0 8px 1px var(--signal);
    pointer-events: none;
    animation: time-sweep 1.6s ease-out infinite;
}
@keyframes time-breathe {
    0%, 100% { box-shadow: 0 0 0 0 transparent; }
    50%      {
        box-shadow: 0 0 0 2px var(--signal-glow),
                    0 0 14px 3px rgba(207, 63, 10, 0.32);
    }
}
@keyframes time-sweep {
    0%   { left: -3px; opacity: 0; }
    8%   { opacity: 0.7; }
    70%  { opacity: 0.7; }
    100% { left: calc(100% + 2px); opacity: 0; }
}
.hud-time::before {
    content: "T-";
    color: var(--ink-faint);
    margin-right: 0.25rem;
    font-weight: 500;
}
.hud-time.is-warning {
    color: var(--warn);
    border-color: var(--warn);
}
.hud-time.is-critical {
    color: var(--paper);
    background: var(--signal);
    border-color: var(--signal);
    animation: blink 0.9s ease-in-out infinite;
}
.hud-time.is-critical::after { display: none; }
@media (max-width: 720px) {
    .hud-row { flex-wrap: wrap; gap: var(--s2); font-size: 0.65rem; }
    .hud-bar { order: 10; flex-basis: 100%; height: 2px; }
}

/* Topic divider */
.topic {
    margin-bottom: var(--s6);
}
.topic-head {
    display: flex;
    align-items: baseline;
    gap: var(--s3);
    margin: var(--s6) 0 var(--s4);
    padding-top: var(--s3);
    padding-bottom: var(--s2);
    border-top: 1px solid var(--ink);
    border-bottom: 1px dashed var(--rule);
}
.topic-code {
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--signal);
    white-space: nowrap;
    font-weight: 600;
}
.topic-title {
    font-family: var(--display);
    font-size: clamp(1.0625rem, 1.8vw, 1.25rem);
    font-weight: 700;
    text-wrap: balance;
    color: var(--ink);
    margin: 0;
    line-height: 1.2;
}

/* Question */
.question {
    margin: 0 0 var(--s5);
    padding: var(--s4) 0 var(--s3);
    border-top: 1px dashed var(--rule);
    display: grid;
    grid-template-columns: 4.5rem 1fr;
    gap: var(--s4);
}
.question:first-of-type { border-top: none; padding-top: var(--s2); }

.q-code {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--signal);
    padding-top: 0.35em;
    white-space: nowrap;
}
.q-body { margin: 0; min-width: 0; }
.q-text {
    font-family: var(--display);
    font-size: 1.0625rem;
    font-weight: 500;
    line-height: 1.4;
    color: var(--ink);
    margin: 0 0 var(--s3);
    text-wrap: pretty;
}

.q-image {
    margin: var(--s3) 0;
    border: 1px solid var(--rule-strong);
    padding: var(--s3);
    background: var(--paper-dim);
    display: inline-block;
    max-width: 100%;
}
.q-image img { width: auto; max-width: 100%; max-height: 24rem; }

/* Radio answers */
.input-radio-group {
    display: grid;
    gap: 2px;
    margin: 0;
    width: auto;
}
.input-radio-group label {
    display: grid;
    grid-template-columns: 1.25rem 1fr;
    gap: 0.85rem;
    align-items: start;
    padding: 0.55rem 0.75rem;
    margin: 0;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 140ms, border-color 140ms;
    line-height: 1.45;
    font-size: 0.9375rem;
    color: var(--ink);
    width: auto !important;
    min-width: 0 !important;
    margin-right: 0 !important;
}
.input-radio-group label:hover {
    background: var(--signal-dim);
    border-color: var(--rule);
}
.input-radio-group label:has(input:checked) {
    background: var(--signal-glow);
    border-color: var(--signal);
}

.input-radio-group input[type="radio"]:not(.hidden) {
    appearance: none;
    -webkit-appearance: none;
    width: 1.125rem;
    height: 1.125rem;
    margin: 0.2em 0 0 0 !important;
    border: 1.5px solid var(--ink-soft);
    border-radius: 50%;
    background: var(--paper);
    flex-shrink: 0;
    position: relative;
    cursor: pointer;
    transition: border-color 140ms;
}
.input-radio-group input[type="radio"]:not(.hidden):checked {
    border-color: var(--signal);
}
.input-radio-group input[type="radio"]:not(.hidden):checked::after {
    content: "";
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--signal);
    box-shadow: 0 0 0.5rem var(--signal-glow);
}

.hidden { display: none !important; }

/* Marginal note — empty by default, becomes a small red gutter stamp on error */
.marginal-note { display: none; }
.marginal-note.field-validation-error,
.marginal-note:not(:empty) {
    display: inline-block;
    margin-top: 0.5rem;
    padding: 0.25rem 0.5rem;
    font-family: var(--mono);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--paper);
    background: var(--fail);
    line-height: 1.15;
    white-space: nowrap;
    transform: rotate(-2deg);
    transform-origin: left center;
    box-shadow: 1px 1px 0 rgba(0,0,0,0.15);
}
.question.has-error .q-code .q-code-label {
    color: var(--fail);
}

/* Submit */
.submit-row {
    margin: var(--s7) 0 var(--s5);
    padding: var(--s4) 0 0;
    border-top: 1px solid var(--ink);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--s2);
}
button[type="submit"] {
    font-family: var(--display);
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--paper);
    background: var(--ink);
    border: none;
    padding: 1rem 2.5rem;
    text-transform: uppercase;
    transition: background 160ms, transform 80ms;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
}
button[type="submit"]::after {
    content: "↗";
    font-family: var(--mono);
    font-weight: 400;
    color: var(--signal);
    transition: transform 200ms;
}
button[type="submit"]:hover { background: var(--signal); }
button[type="submit"]:hover::after { color: var(--paper); transform: translate(2px, -2px); }
button[type="submit"]:active { transform: translateY(1px); }

.submit-note {
    font-family: var(--mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-faint);
}

/* ----- Results ------------------------------------------------------------ */
.result {
    margin: var(--s5) 0;
    padding: var(--s5);
    border-left: 4px solid;
    background: var(--paper-dim);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--s5);
    align-items: center;
}
.result-meta { display: flex; flex-direction: column; gap: var(--s2); }
.result-eyebrow {
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-weight: 600;
}
.result-title {
    font-family: var(--display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.02em;
    text-wrap: balance;
    margin: 0;
}
.result-detail {
    font-size: 0.9375rem;
    color: var(--ink-soft);
    margin: 0;
}
.result-score {
    font-family: var(--display);
    font-weight: 900;
    line-height: 0.85;
    letter-spacing: -0.05em;
    font-size: clamp(3.5rem, 8vw, 5.5rem);
    text-align: right;
    font-variant-numeric: tabular-nums;
}
.result-score small {
    display: block;
    font-family: var(--mono);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-top: var(--s2);
}

.result.alert-success { border-color: var(--pass); background: var(--pass-bg); }
.result.alert-success .result-eyebrow { color: var(--pass); }
.result.alert-success .result-score   { color: var(--pass); }

.result.alert-warning { border-color: var(--warn); background: var(--warn-bg); }
.result.alert-warning .result-eyebrow { color: var(--warn); }
.result.alert-warning .result-score   { color: var(--warn); }

.result.alert-danger  { border-color: var(--fail); background: var(--fail-bg); }
.result.alert-danger  .result-eyebrow { color: var(--fail); }
.result.alert-danger  .result-score   { color: var(--fail); }

@media (max-width: 640px) {
    .result { grid-template-columns: 1fr; gap: var(--s3); padding: var(--s4); }
    .result-score { text-align: left; }
}

/* Report stats — exam start time and elapsed */
.report-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s4);
    margin: var(--s4) 0 var(--s5);
    padding: var(--s3) var(--s4);
    border-top: 1px dashed var(--rule-strong);
    border-bottom: 1px dashed var(--rule-strong);
}
.report-stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.report-stat dt {
    font-family: var(--mono);
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
    margin: 0;
}
.report-stat dd {
    font-family: var(--display);
    font-weight: 700;
    font-size: 1.125rem;
    line-height: 1.05;
    color: var(--ink);
    margin: 0;
    font-variant-numeric: tabular-nums;
}

/* Mistakes log */
.mistakes-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--s3);
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    margin: var(--s7) 0 var(--s2);
    padding-bottom: var(--s2);
    border-bottom: 1px solid var(--ink);
}
.mistakes-head .label { color: var(--signal); font-weight: 600; }
.mistakes-head .label.is-pass { color: var(--pass); }
.mistakes-head .count { color: var(--ink-faint); }
.mistake-code.is-pass { color: var(--pass); }

/* Collapsible report sections (correct answers, mistakes log) — two-column grid */
.report-logs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
    gap: var(--s4);
    align-items: start;
    margin: var(--s5) 0;
}

details.collapsible { margin: 0; }

/* Summary as an obvious clickable button */
details.collapsible > summary.mistakes-head {
    cursor: pointer;
    list-style: none;
    user-select: none;
    margin: 0;
    padding: var(--s3) var(--s4);
    background: var(--paper-dim);
    border: 1px solid var(--rule-strong);
    border-bottom: 1px solid var(--rule-strong);
    transition: background 160ms, border-color 160ms, transform 80ms;
}
details.collapsible > summary::-webkit-details-marker { display: none; }
details.collapsible > summary::marker { content: ""; }

details.collapsible > summary:hover {
    background: var(--paper-deep);
    border-color: var(--ink);
}
details.collapsible > summary:active {
    transform: translateY(1px);
}
details.collapsible > summary:focus-visible {
    outline: 2px solid var(--signal);
    outline-offset: 2px;
}

details.collapsible[open] > summary.mistakes-head {
    border-color: var(--ink);
    background: var(--paper-deep);
}

/* Dynamic toggle hint — appears after the count */
details.collapsible:not([open]) > summary .count::after {
    content: " · развернуть";
    color: var(--signal);
    font-weight: 600;
    letter-spacing: 0.18em;
}
details.collapsible[open] > summary .count::after {
    content: " · свернуть";
    color: var(--ink-faint);
    letter-spacing: 0.18em;
}

/* Body of the expanded log */
details.collapsible > ul.mistakes {
    margin: 0;
    padding: 0 var(--s4);
    border: 1px solid var(--ink);
    border-top: none;
    background: var(--paper);
    animation: fadeUp 0.35s ease both;
}
details.collapsible > ul.mistakes > li:first-child {
    padding-top: var(--s4);
}

@media (max-width: 720px) {
    .report-logs { grid-template-columns: minmax(0, 1fr); }
}

ul.mistakes {
    list-style: none;
    margin: 0;
    padding: 0;
}
ul.mistakes li {
    margin: 0;
    padding: var(--s4) 0;
    border-bottom: 1px dashed var(--rule);
    display: grid;
    grid-template-columns: 4.5rem 1fr;
    gap: var(--s4);
}
.mistake-code {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fail);
    padding-top: 0.35em;
}
.mistake-body { min-width: 0; }
.mistake-body blockquote {
    margin: 0 0 var(--s3);
    padding: 0;
    background: none;
    font-family: var(--display);
    font-weight: 500;
    font-size: 0.75rem;
    line-height: 1.4;
    color: var(--ink);
}
.mistake-body blockquote p { margin: 0; }

.mistake-answers {
    display: grid;
    gap: 0.4rem;
    margin: 0;
    width: auto;
}
.mistake-answers > div { margin: 0; }

.wrong, .right {
    display: inline-flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    font-family: var(--mono);
    font-size: 0.875rem;
    line-height: 1.35;
    border-radius: 0;
}
.wrong {
    color: var(--fail);
    background: var(--fail-bg);
    text-decoration: line-through;
    font-style: normal;
}
.right {
    color: var(--paper);
    background: var(--pass);
    text-decoration: none;
}
.wrong::before  { content: "✕"; font-weight: 700; text-decoration: none; }
.right::before  { content: "✓"; font-weight: 700; }

@media (max-width: 640px) {
    ul.mistakes li { grid-template-columns: 1fr; gap: var(--s2); }
}

/* ----- Modal dialogs ------------------------------------------------------ */
dialog.modal {
    border: none;
    padding: 0;
    background: transparent;
    max-width: 32rem;
    width: calc(100% - 2rem);
    margin: auto;
    color: var(--ink);
}
dialog.modal::backdrop {
    background: rgba(26, 22, 18, 0.55);
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
}
dialog.modal[open] {
    animation: modalOpen 220ms cubic-bezier(.2,.7,.3,1) both;
}
dialog.modal[open]::backdrop {
    animation: backdropFade 220ms ease both;
}
@keyframes modalOpen {
    from { opacity: 0; transform: translateY(-8px) scale(0.98); }
    to   { opacity: 1; transform: none; }
}
@keyframes backdropFade {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.modal-card {
    background: var(--paper);
    border-left: 4px solid var(--signal);
    padding: var(--s5);
    display: grid;
    gap: var(--s3);
    box-shadow: 0 24px 60px -12px rgba(26, 22, 18, 0.4),
                0 4px 12px -4px rgba(26, 22, 18, 0.25);
    position: relative;
    overflow: hidden;
}
.modal-card::before {
    content: "· – – ·   – · · ·";
    position: absolute;
    top: var(--s2);
    right: var(--s3);
    font-family: var(--mono);
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    color: var(--rule-strong);
    pointer-events: none;
}
.modal-eyebrow {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--signal);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.modal-eyebrow::before {
    content: "";
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: currentColor;
    animation: blink 1.4s ease-in-out infinite;
}
.modal-eyebrow.is-expired {
    color: var(--fail);
    border-left: none;
}
.modal-title {
    font-family: var(--display);
    font-size: clamp(1.25rem, 3vw, 1.625rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin: 0;
    text-wrap: balance;
    color: var(--ink);
}
.modal-body {
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--ink-soft);
    margin: 0;
}
.modal-body strong { color: var(--ink); font-weight: 600; }
.intro-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s3);
    margin: var(--s2) 0;
    padding: var(--s3) 0;
    border-top: 1px dashed var(--rule-strong);
    border-bottom: 1px dashed var(--rule-strong);
}
.intro-stat {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}
.intro-stat dt {
    font-family: var(--mono);
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
    margin: 0;
}
.intro-stat dd {
    font-family: var(--display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--ink);
    margin: 0;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.modal-actions {
    display: flex;
    gap: var(--s2);
    flex-wrap: wrap;
    margin-top: var(--s2);
}
.modal-btn {
    font-family: var(--display);
    font-size: 0.9375rem;
    font-weight: 700;
    padding: 0.65rem 1.25rem;
    border: 1px solid var(--ink);
    background: var(--paper);
    color: var(--ink);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: -0.005em;
    transition: background 160ms, color 160ms, border-color 160ms;
}
.modal-btn:hover { background: var(--ink); color: var(--paper); }
.modal-btn-primary {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
}
.modal-btn-primary:hover { background: var(--signal); color: var(--paper); border-color: var(--signal); }

@media (max-width: 480px) {
    .modal-card { padding: var(--s4); }
    .modal-actions { flex-direction: column-reverse; align-items: stretch; }
    .modal-btn { width: 100%; text-align: center; }
}

/* ----- Italic utility (used in exam category descriptions) ---------------- */
.fst-italic {
    font-family: var(--display);
    font-style: normal;
    font-weight: 500;
    font-size: 1rem;
    color: var(--ink-soft);
    border-left: 2px solid var(--signal);
    padding: var(--s2) 0 var(--s2) var(--s3);
    margin: var(--s4) 0;
    max-width: 60ch;
    line-height: 1.45;
}

/* ----- Responsive --------------------------------------------------------- */
@media (max-width: 720px) {
    .question { grid-template-columns: 1fr; gap: var(--s2); }
    .q-code { padding-top: 0; }
    .brand-meta { font-size: 0.6rem; }
    nav.primary a { margin-right: var(--s2); }
    .submit-row { padding: var(--s3) 0 0; }
    button[type="submit"] { padding: 0.85rem 1.75rem; font-size: 1rem; }
}

/* ----- Motion ------------------------------------------------------------- */
.hero, .intro-block, .cat-section-head, .cat-grid, .exam-head, .hud, .topic {
    animation: fadeUp 0.6s ease both;
}
.cat:nth-child(1) { animation: fadeUp 0.5s ease 0.05s both; }
.cat:nth-child(2) { animation: fadeUp 0.5s ease 0.10s both; }
.cat:nth-child(3) { animation: fadeUp 0.5s ease 0.15s both; }
.cat:nth-child(4) { animation: fadeUp 0.5s ease 0.20s both; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
}