/* ================================================================
   special-angles.css
   ----------------------------------------------------------------
   Styles for "Special Angles by Construction" (Tier 6) on the Class 6
   Math page (Geometry tools & constructions):

     - A.1  60 deg with Compass Only      (equilateral-triangle arcs)
     - A.2  120 deg and 30 deg            (angle fans, bisected angles)
     - A.3  90 deg by Construction        (perpendicular, clock face)
     - A.4  45 deg by Bisecting 90 deg    (set squares, folded paper)
     - A.5  Which Angles Can I Make?      (goal puzzle pictures)

   Same shared popup shell as meet-tools / circle-pi (quiz-overlay /
   quiz-modal), so this file only styles the pictures and the answer
   chips. Fully self-contained: every class starts with "sa-" and every
   popup id starts with "sac". Site colour variables (--primary,
   --secondary, --line, --sun) are read with fallbacks.

   Finish (kid-friendly, matt + shine): glossy violet / purple /
   magenta / teal / gold / sky wedges and balls with a soft shine and a
   sparkle on a matt pastel lavender "paper" stage. Bold magenta arcs,
   teal triangles and a red dashed bisector give high contrast that is
   never harsh, so pictures stay readable for young eyes.

   Layout notes
   - Answer chips ALWAYS stay on ONE row (flex-wrap: nowrap), 4 chips.
   - Android-native feel: >=52px touch targets, instant :active press,
     no 300ms delay, no grey tap flash, safe-area padding.
   - Works the same on desktop browsers (hover only where a mouse exists).

     <link rel="stylesheet" th:href="@{/css/special-angles.css}" />
   ================================================================ */

/* ---------- SVG paint ---------- */
.sa-svg { display: block; width: 100%; height: 100%; overflow: visible; }
.sa-o { stroke: rgba(60, 38, 120, 0.60); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.sa-sh { filter: drop-shadow(0 4px 3px rgba(60, 38, 120, 0.25)); }
.sa-gloss { fill: #fff; opacity: 0.38; pointer-events: none; }
.sa-spark { fill: #fff; opacity: 0.9; pointer-events: none; }
.sa-nopt { pointer-events: none; stroke: none; }

.sa-t {
    font: 800 22px/1 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    fill: #34205f; text-anchor: middle; dominant-baseline: central;
    stroke: #fff; stroke-width: 5; paint-order: stroke; stroke-linejoin: round;
    pointer-events: none; user-select: none; -webkit-user-select: none;
}
.sa-t-lbl { font-size: 24px; }
.sa-t-small { font-size: 19px; }
.sa-t-tick { font-size: 15px; stroke: none; fill: #5a3d00; }
.sa-t-badge { font-size: 18px; stroke: none; fill: #34205f; }
.sa-t-white { fill: #fff; stroke: rgba(60, 38, 120, .55); stroke-width: 5; }
.sa-t-pi { font-size: 120px; fill: #fff; stroke: rgba(80, 40, 170, .65); stroke-width: 7; }
.sa-t-digit { font-size: 34px; letter-spacing: 1px; }

/* lines: white underlay + coloured core */
.sa-under { stroke: #fff; stroke-width: 11; stroke-linecap: round; opacity: .9; }
.sa-seg { stroke-width: 6; stroke-linecap: round; fill: none; }
.sa-dia { stroke: #2f7fe8; }
.sa-hot { stroke: #ef3b3b; }
.sa-neu { stroke: #34205f; }
.sa-string { stroke: #e0368a; stroke-width: 7; stroke-linecap: round; fill: none; }
.sa-ring { fill: none; stroke: #e0368a; stroke-width: 6; stroke-dasharray: 2 10; stroke-linecap: round; }
.sa-ring-solid { fill: none; stroke: #e0368a; stroke-width: 6; }
.sa-cdot { fill: #34205f; stroke: #fff; stroke-width: 3; }
.sa-pt-red { fill: #ef3b3b; stroke: #fff; stroke-width: 3; }
.sa-spoke { stroke: rgba(255, 255, 255, .8); stroke-width: 5; stroke-linecap: round; }
.sa-hub { fill: #fff; stroke: rgba(60, 38, 120, .6); stroke-width: 3; }
.sa-start { stroke: #10b981; stroke-width: 4; stroke-dasharray: 5 5; }
.sa-arrow { fill: none; stroke: #7c4dff; stroke-width: 6; stroke-linecap: round; stroke-linejoin: round; }

/* rulers and bars */
.sa-ruler { fill: #ffe9a8; stroke: rgba(90, 61, 0, .55); stroke-width: 2.5; }
.sa-rtick { stroke: #5a3d00; stroke-width: 2.5; stroke-linecap: round; }
.sa-ground { fill: #d9ccff; stroke: rgba(60, 38, 120, .45); stroke-width: 2.5; }
.sa-bar { stroke: rgba(60, 38, 120, .55); stroke-width: 2.5; }
.sa-bar-faint { opacity: .35; }
.sa-brace { fill: none; stroke: #34205f; stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }

/* calculator-style display */
.sa-calc { fill: #2a1b5c; stroke: #7c4dff; stroke-width: 4; }
.sa-calc-t { font: 800 38px/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; fill: #c8f7ff; text-anchor: middle; dominant-baseline: central; stroke: none; }
.sa-calc-s { font-size: 26px; fill: #ffd54a; }

/* ---------- picture card ---------- */
.quiz-overlay[id^="sac"] .quiz-modal { --sa-fig: 250px; }
.quiz-overlay[id^="sac"] .quiz-question b { color: var(--secondary, #4b3f8f); }
.quiz-overlay[id^="sac"] .bq-btn,
.quiz-overlay[id^="sac"] .bq-next-btn { touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.quiz-overlay[id^="sac"] .bq-next-btn { margin-bottom: env(safe-area-inset-bottom, 0px); }
.quiz-overlay[id^="sac"] .bq-summary-buttons { margin-bottom: env(safe-area-inset-bottom, 0px); }
.quiz-overlay[id^="sac"] .quiz-modal { overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }

.sa-wrap { display: flex; flex-direction: column; align-items: center; gap: 10px; margin: 8px auto 0; }
.sa-stage {
    position: relative;
    width: var(--sa-fig);
    aspect-ratio: 1 / 1;
    box-sizing: border-box;
    padding: 6px;
    border-radius: 20px;
    background:
        radial-gradient(120% 90% at 25% 10%, rgba(255, 255, 255, .92), rgba(255, 255, 255, 0) 60%),
        linear-gradient(180deg, #f7f2ff 0%, #ece3ff 100%);
    border: 2px solid var(--line, #ddd2fb);
    box-shadow: 0 3px 0 rgba(75, 63, 143, 0.08), inset 0 0 22px rgba(167, 139, 250, .16);
}
.sa-stage > svg { width: 100%; height: 100%; }
.sa-stage.sa-wide { width: min(100%, calc(var(--sa-fig) * 1.7)); aspect-ratio: 2 / 1; }
.sa-hint { margin: 0; text-align: center; font-size: 13px; font-weight: 700; color: #7a71a8; line-height: 1.35; max-width: 360px; }
.sa-hint b { color: var(--secondary, #4b3f8f); }
.sa-replay {
    min-height: 44px; padding: 8px 20px; border: 2px solid var(--primary, #6c5ce7); border-radius: 999px;
    background: #fff; color: var(--primary, #6c5ce7); font: inherit; font-weight: 800; font-size: 15px;
    box-shadow: 0 3px 0 rgba(108, 92, 231, 0.20); cursor: pointer;
    touch-action: manipulation; -webkit-tap-highlight-color: transparent; user-select: none; -webkit-user-select: none;
    transition: transform .08s ease, box-shadow .15s;
}
.sa-replay:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(108, 92, 231, 0.20); }

/* ================================================================
   Answer chips: ALWAYS a single line (4 chips)
   ================================================================ */
.quiz-number-options.sa-picker {
    display: flex;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 480px;
    margin: 16px auto 4px;
}
.quiz-number-options.sa-picker:empty { display: none; }
.quiz-number-opt.sa-opt {
    display: inline-flex;
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: auto !important;
    min-height: 54px !important;
    max-height: none !important;
    box-sizing: border-box !important;
    padding: 10px 5px;
    white-space: normal !important;
    overflow: hidden;
    overflow-wrap: break-word;
    font-weight: 800;
    font-size: 15.5px;
    line-height: 1.2;
    text-align: center;
    color: var(--secondary, #4b3f8f);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    transition: transform .08s ease, box-shadow .15s, border-color .15s, background .15s;
}
.quiz-number-opt.sa-opt.sa-sym { font-size: 30px; line-height: 1; }
.quiz-number-opt.sa-opt:active:not(:disabled) { transform: scale(.96); background: rgba(124, 77, 255, 0.10); }
@media (hover: hover) {
    .quiz-number-opt.sa-opt:hover:not(:disabled) { border-color: var(--primary, #6c5ce7); }
}
.quiz-number-opt.sa-opt.is-correct { border-color: #10b981; background: rgba(16, 185, 129, 0.08); box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18); }
.quiz-number-opt.sa-opt.is-wrong { border-color: #ef4444; background: rgba(239, 68, 68, 0.08); box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.18); }
.quiz-number-opt.sa-opt.has-thumb { padding: 6px 4px 8px; }
.sa-opt-thumb { display: block; width: 100%; max-width: 78px; aspect-ratio: 1 / 1; }
.sa-opt-letter { font-size: 13px; font-weight: 800; opacity: .85; }

/* ================================================================
   Responsive (phones): shrink the drawings and chips only
   ================================================================ */
@media (max-width: 560px) {
    .quiz-overlay[id^="sac"] .quiz-modal { --sa-fig: 232px; }
    .quiz-number-options.sa-picker { gap: 8px; margin-top: 14px; }
    .quiz-number-opt.sa-opt { font-size: 12.5px; padding: 8px 3px; min-height: 52px !important; letter-spacing: -0.1px; }
    .sa-opt-thumb { max-width: 68px; }

}
@media (max-width: 380px) {
    .quiz-overlay[id^="sac"] .quiz-modal { --sa-fig: 204px; }
    .quiz-number-opt.sa-opt { font-size: 11.5px; padding: 7px 2px; }
    .quiz-number-opt.sa-opt.sa-sym { font-size: 26px; }
    .quiz-number-opt.sa-opt.has-thumb { padding: 5px 2px 6px; }
    .quiz-number-options.sa-picker { gap: 6px; }
    .sa-opt-thumb { max-width: 58px; }
    .sa-hint { font-size: 12.5px; }

}
@media (pointer: coarse) {
    .quiz-number-opt.sa-opt { min-height: 56px !important; }
}
@media (max-height: 560px) and (orientation: landscape) {
    .quiz-overlay[id^="sac"] .quiz-modal { --sa-fig: 176px; }
}
@media (prefers-reduced-motion: reduce) {
    .quiz-number-opt.sa-opt, .sa-replay { transition: none; }
}
/* ---------- tools & line-art added for Tier 1 ---------- */
.sa-thin { stroke-width: 1.8; }
.sa-legu { stroke: #fff; stroke-width: 17; stroke-linecap: round; opacity: .9; }
.sa-leg  { stroke-width: 12; stroke-linecap: round; fill: none; }
.sa-legh { stroke: #fff; stroke-width: 3; stroke-linecap: round; opacity: .6; }
.sa-semi { fill-opacity: .8; }
.sa-cell { fill: rgba(255, 255, 255, .6); stroke: var(--line, #ddd2fb); stroke-width: 2.5; }

/* line art: white underlay + coloured core */
.sa-fu { fill: none; stroke: #fff; stroke-width: 15; stroke-linecap: round; stroke-linejoin: round; opacity: .9; }
.sa-fs { stroke-width: 8; stroke-linecap: round; stroke-linejoin: round; }
.sa-dash { stroke-dasharray: 2 14; }
.sa-guide { stroke: #7c4dff; stroke-width: 2; stroke-dasharray: 4 5; opacity: .3; }
.sa-guide2 { fill: none; stroke: #7c4dff; stroke-width: 3; stroke-dasharray: 3 9; stroke-linecap: round; opacity: .35; }
.sa-leader { stroke: #34205f; stroke-width: 3; stroke-linecap: round; stroke-dasharray: 2 6; }
.sa-spoke2 { stroke: #fff; stroke-width: 4; stroke-linecap: round; opacity: .85; }
.sa-ray { stroke-width: 9; stroke-linecap: round; }

/* compass drawing animation */
.sa-arc { fill: none; stroke: #e0368a; stroke-width: 8; stroke-linecap: round; }
.sa-arm { stroke: #7c4dff; stroke-width: 6; stroke-linecap: round; opacity: .85; }
.sa-pin { fill: #ef3b3b; stroke: #fff; stroke-width: 3; }
.sa-tipdot { fill: #ffd54a; stroke: #34205f; stroke-width: 3; }
.sa-gap { stroke: #ef3b3b; stroke-width: 5; stroke-dasharray: 3 8; stroke-linecap: round; }

/* start / arrows */
.sa-arrow { fill: none; stroke: #7c4dff; stroke-width: 6; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Tier 6 additions ---------- */
.sa-t-num { font-size: 17px; stroke: none; fill: #34205f; }
.sa-face { fill: #fff; fill-opacity: .92; stroke: rgba(60, 38, 120, .35); stroke-width: 2; }
.sa-ctick { stroke: #34205f; stroke-width: 3; stroke-linecap: round; }
.sa-rt { fill: none; stroke: #ef3b3b; stroke-width: 4; stroke-linejoin: round; stroke-linecap: round; }
.sa-tick { stroke: #e0368a; stroke-width: 5; stroke-linecap: round; }
.sa-dash { stroke-dasharray: 10 9; }
.sa-leg { stroke-width: 9; stroke-linecap: round; fill: none; }
.sa-legu { stroke: #fff; stroke-width: 14; stroke-linecap: round; opacity: .9; }

/* the picture pops in softly when a new question appears */
@keyframes saPop { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: scale(1); } }
.sa-stage > svg { animation: saPop .28s ease-out both; }
@media (prefers-reduced-motion: reduce) { .sa-stage > svg { animation: none; } }

/* chips: long route texts (A.5) wrap inside the chip, never push a 2nd row */
.quiz-number-opt.sa-opt { hyphens: auto; }