/* Grammar Connect — styles specific to grammar.html.
   "Ai to Shu" (藍と朱, indigo and vermillion): a deep indigo-dye ground with a hanko-stamp
   red accent, distinct from Word Match's violet/gold hanafuda theme, Phonetics' light
   jade/copper, the Reader's warm gold, and the portfolio's cool blue-gray. Like game.css this
   page commits to its own semantically-named token set (--ai/--shu/--washi/--sumi/...) rather
   than reusing style.css's generic --accent/--bg-page names, since "ink on dyed cloth" is a
   distinct enough visual identity to deserve its own vocabulary (see game.css's --gold/
   --crimson/--wisteria for the same reasoning). All tokens live under .grammar-main, not
   :root, so nothing leaks into the shared header, footer, or the light auth/account modals. */

/* Full-bleed body background, same reasoning as game.css's body:has(.game-main) rule: body
   can't read a descendant's custom properties, so it needs the single deepest color directly
   rather than the whole token block. */
body:has(.grammar-main) {
    background: #12192b;
}

.grammar-main {
    --ai: #1f2f52;
    --ai-light: #4a63a0;
    --ai-pale: #7d93c9;
    --shu: #bc4430;
    --shu-light: #e0705a;
    --washi: #ece5d3;
    --card: #241f38;
    --card-edge: rgba(241, 237, 224, 0.14);
    --ink: #f1ede0;
    --ink-soft: rgba(241, 237, 224, 0.55);
    --ink-faint: rgba(241, 237, 224, 0.32);
    --good: #4f8a68;
    --good-bright: #7fbf9e;

    --font-jp: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-pop: cubic-bezier(0.22, 1, 0.36, 1);

    position: relative;
    isolation: isolate;
    padding: 89px 40px 60px;
    min-height: 100vh;
    background: radial-gradient(ellipse 120% 60% at 50% -10%, #1c2542 0%, #161d38 45%, #12192b 100%);
    color: var(--ink);
}

.gc-section.hidden { display: none; }

/* ---------------------------------------------------------------------
   Level select — night Tokyo skyline
   --------------------------------------------------------------------- */
#gc-select-section {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
    padding: 40px clamp(20px, 4vw, 48px) 48px;
    overflow: hidden;
}

.gc-night-sky {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        linear-gradient(180deg, rgba(18, 25, 43, 0.35) 0%, rgba(18, 25, 43, 0.72) 55%, #12192b 100%),
        url('images/grammar-bg/tokyo-night.jpg');
    background-size: cover;
    background-position: center 30%;
}

.gc-stars span {
    position: absolute;
    width: 2px;
    height: 2px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.65);
}

.gc-moon {
    position: absolute;
    top: 28px;
    right: 56px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #f3e6c8;
    box-shadow: 0 0 36px 6px rgba(243, 230, 200, 0.3);
}

.gc-select-content {
    position: relative;
    z-index: 1;
}

.gc-hud-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
}

.gc-title {
    font-family: 'Fraunces', Georgia, serif;
    font-size: clamp(1.9rem, 3.4vw, 2.6rem);
    margin: 0 0 10px;
    color: var(--ink);
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.4);
}

.gc-title-sub {
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--shu-light);
    letter-spacing: 0.04em;
    margin-top: 4px;
}

.gc-subtitle {
    max-width: 62ch;
    color: var(--ink-soft);
    font-size: 0.98rem;
    line-height: 1.6;
    margin: 0;
}

.sound-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid rgba(224, 112, 90, 0.4);
    background: rgba(224, 112, 90, 0.1);
    color: var(--shu-light);
    font-size: 1.05rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s ease, transform 0.2s var(--ease-pop), box-shadow 0.2s ease;
}

.sound-toggle:hover { background: rgba(224, 112, 90, 0.2); transform: translateY(-1px); }
.sound-toggle:focus-visible { outline: 2px solid var(--shu-light); outline-offset: 2px; }
.sound-toggle.on { box-shadow: 0 0 0 2px rgba(224, 112, 90, 0.28); }

.gc-guest-hint {
    margin: 16px 0 0;
    font-size: 0.85rem;
    color: var(--ink-faint);
}

.gc-diff-tabs {
    display: flex;
    gap: 12px;
    margin: 28px 0 28px;
    flex-wrap: wrap;
}

.gc-diff-swatch {
    flex: 1;
    min-width: 220px;
    background: rgba(20, 27, 51, 0.72);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    border: 1px solid var(--card-edge);
    border-left: 4px solid var(--card-edge);
    padding: 16px 20px;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    color: inherit;
    transition: border-color 0.2s var(--ease-out);
}

.gc-diff-swatch.active { border-left-color: var(--shu-light); }

.gc-diff-swatch .dname {
    display: block;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--ink-soft);
    margin-bottom: 3px;
}

.gc-diff-swatch.active .dname { color: var(--ink); }

.gc-diff-swatch .drange {
    font-size: 0.8rem;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
}

.gc-level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 14px;
}

.gc-level-card {
    background: rgba(20, 27, 51, 0.72);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    border: 1px solid var(--card-edge);
    padding: 16px 14px;
    cursor: pointer;
    position: relative;
    text-align: left;
    font-family: inherit;
    color: inherit;
    transition: transform 0.15s var(--ease-out), border-color 0.15s var(--ease-out);
}

.gc-level-card:hover {
    transform: translateY(-2px);
    border-color: rgba(241, 237, 224, 0.3);
}

.gc-level-card .lnum {
    font-family: 'Fraunces', Georgia, serif;
    font-size: 1.4rem;
    color: var(--ink);
}

.gc-level-card .lname {
    font-size: 0.7rem;
    color: var(--ink-faint);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}

.gc-level-card .lstamp {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 20px;
    height: 20px;
    border: 1px solid var(--good-bright);
    color: var(--good-bright);
    font-family: var(--font-jp);
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---------------------------------------------------------------------
   Match screen
   --------------------------------------------------------------------- */
#gc-match-section {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
}

/* Effects layer -- a canvas (particle bursts/rings/dust, see grammar.js's GrammarFx) plus a
   plain DOM layer (floating "+30s" / "-10s" text) both sized to the whole match section rather
   than just the tile bank, so a correct/wrong tap's effects can reach from the tapped tile up
   to the sentence card without being clipped. pointer-events:none on both keeps every real
   click going straight through to the tiles underneath. */
.gc-fx-canvas, .gc-fx-text-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.gc-float-text {
    position: absolute;
    transform: translate(-50%, -50%);
    font-family: 'Fraunces', Georgia, serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--good-bright);
    text-shadow: 0 0 18px rgba(127, 191, 158, 0.55), 0 2px 6px rgba(0, 0, 0, 0.5);
    white-space: nowrap;
    animation: gc-float-up 1.1s var(--ease-out) forwards;
}

.gc-float-text.penalty {
    color: var(--shu-light);
    text-shadow: 0 0 18px rgba(224, 112, 90, 0.55), 0 2px 6px rgba(0, 0, 0, 0.5);
}

@keyframes gc-float-up {
    0% { opacity: 0; transform: translate(-50%, -40%) scale(0.7); }
    18% { opacity: 1; transform: translate(-50%, -70%) scale(1.08); }
    30% { transform: translate(-50%, -78%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -140%) scale(1); }
}

.gc-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--card-edge);
    margin-bottom: 24px;
}

.gc-topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.gc-level-label {
    font-weight: 600;
    color: var(--ink);
}

.gc-topbar-stats {
    display: flex;
    gap: 24px;
    font-variant-numeric: tabular-nums;
}

.gc-stat { text-align: right; }

.gc-stat .v {
    display: block;
    font-family: 'Fraunces', Georgia, serif;
    font-size: 1.2rem;
    color: var(--ink);
}

.gc-stat .k {
    font-size: 0.63rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-faint);
}

.gc-stat-timer .v { color: var(--shu-light); }
.gc-stat-timer.low-time .v { animation: gc-pulse 1s ease-in-out infinite; color: var(--shu-light); }

@keyframes gc-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.gc-match-body {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 32px;
    align-items: start;
}

.gc-match-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 40px;
}

.gc-progress-dots {
    display: flex;
    gap: 6px;
    margin-bottom: 28px;
}

.gc-progress-dots span {
    width: 7px;
    height: 7px;
    background: rgba(241, 237, 224, 0.22);
    transition: background 0.2s var(--ease-out);
}

.gc-progress-dots span.done { background: var(--good-bright); }
.gc-progress-dots span.now { background: var(--shu-light); }

.gc-sentence-card {
    background: var(--card);
    border: 1px solid var(--card-edge);
    padding: 36px 40px;
    max-width: 640px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 50px -24px rgba(0, 0, 0, 0.6);
}

.gc-sentence-jp {
    font-family: var(--font-jp);
    font-size: clamp(1.25rem, 2.4vw, 1.55rem);
    line-height: 2.5;
    letter-spacing: 0.02em;
    margin: 0;
}

.gc-sentence-jp rt {
    font-size: 0.5rem;
    color: var(--ink-soft);
    font-family: 'IBM Plex Sans', sans-serif;
}

.gc-old-grammar {
    border-bottom: 2px solid var(--shu-light);
    padding-bottom: 3px;
    transition: color 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.gc-old-grammar.swapping {
    color: var(--good-bright);
    border-color: var(--good-bright);
}

.gc-tile-hint {
    margin: 26px 0 16px;
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-faint);
    text-align: center;
}

.gc-tile-bank {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 640px;
}

.gc-tile {
    background: var(--card);
    border: 1px solid var(--card-edge);
    color: var(--ink);
    padding: 12px 6px;
    font-family: var(--font-jp);
    font-size: 0.96rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.12s var(--ease-out), transform 0.12s var(--ease-out), opacity 0.2s var(--ease-out), background 0.15s var(--ease-out);
}

.gc-tile:hover:not(.gc-tile-wrong):not(.gc-tile-disabled) {
    border-color: var(--shu-light);
    transform: translateY(-1px);
}

.gc-tile.gc-tile-wrong {
    animation: gc-shake 0.35s var(--ease-out);
    border-color: var(--shu);
    background: rgba(188, 68, 48, 0.18);
}

.gc-tile.gc-tile-disabled {
    opacity: 0.25;
    pointer-events: none;
}

.gc-tile.gc-tile-correct {
    border-color: var(--good-bright);
    background: rgba(79, 138, 104, 0.3);
    pointer-events: none;
}

@keyframes gc-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.gc-match-side {
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid var(--card-edge);
    padding: 22px 20px;
    max-height: 640px;
    overflow-y: auto;
}

.gc-side-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    margin-bottom: 14px;
}

.gc-cleared-empty {
    font-size: 0.82rem;
    color: var(--ink-faint);
    line-height: 1.5;
}

.gc-cleared-item {
    padding: 13px 0;
    border-bottom: 1px solid rgba(241, 237, 224, 0.1);
    animation: gc-drop-in 0.4s var(--ease-pop);
}

.gc-cleared-item:first-child { padding-top: 0; }

@keyframes gc-drop-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.gc-cleared-item .swap-line {
    font-size: 0.85rem;
    font-family: var(--font-jp);
    margin-bottom: 6px;
}

.gc-cleared-item .old { color: var(--ink-faint); text-decoration: line-through; }
.gc-cleared-item .arrow { color: var(--shu-light); margin: 0 6px; font-family: 'IBM Plex Sans', sans-serif; }
.gc-cleared-item .new { color: var(--good-bright); font-weight: 600; }
.gc-cleared-item .en {
    font-size: 0.78rem;
    color: var(--ink-soft);
    font-style: italic;
    margin: 0 0 4px;
}
.gc-cleared-item .why {
    font-size: 0.73rem;
    color: var(--ink-faint);
    line-height: 1.45;
    margin: 0;
}

/* ---------------------------------------------------------------------
   Start / Result modals — dark themed, scoped by ID (same pattern as
   game.css's #start-modal/#result-modal) so the shared light auth/account
   modals elsewhere on this page are untouched.
   --------------------------------------------------------------------- */
#gc-start-modal .modal-card,
#gc-result-modal .modal-card {
    background: linear-gradient(180deg, #241f38, #1a1730);
    border: 1px solid #bc4430;
    box-shadow: 0 0 60px rgba(188, 68, 48, 0.18), 0 30px 70px -20px rgba(0, 0, 0, 0.8);
    color: #f1ede0;
}

#gc-start-modal .modal-card h3,
#gc-result-modal .modal-card h3 {
    font-family: 'Fraunces', Georgia, serif;
    color: #e0705a;
}

#gc-start-modal .modal-card p,
#gc-result-modal .modal-card p {
    color: rgba(241, 237, 224, 0.6);
}

#gc-result-modal .modal-close { color: rgba(241, 237, 224, 0.6); }

#gc-result-modal .result-stat {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(241, 237, 224, 0.14);
}

#gc-result-modal .result-value { color: #e0705a; }
#gc-result-modal .result-label { color: rgba(241, 237, 224, 0.6); }
#gc-result-modal .result-best { color: rgba(241, 237, 224, 0.6); }
#gc-result-modal .result-save-status { color: #7fbf9e; }

#gc-start-modal .auth-btn,
#gc-result-modal .auth-btn {
    background: linear-gradient(135deg, #bc4430, #8f3122);
    border: 1px solid #bc4430;
    color: #f1ede0;
}

#gc-start-modal .auth-btn:hover,
#gc-result-modal .auth-btn:hover {
    background: linear-gradient(135deg, #e0705a, #bc4430);
}

#gc-start-modal .auth-btn-outline,
#gc-result-modal .auth-btn-outline {
    background: transparent;
    color: #e0705a;
    border-color: #bc4430;
}

#gc-start-modal .auth-btn-outline:hover,
#gc-result-modal .auth-btn-outline:hover {
    background: rgba(188, 68, 48, 0.15);
    color: #e0705a;
}

/* ---------------------------------------------------------------------
   Responsive
   --------------------------------------------------------------------- */
@media (max-width: 968px) {
    .gc-match-body { grid-template-columns: 1fr; }
    .gc-match-side { max-height: none; }
    .gc-tile-bank { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 620px) {
    .grammar-main { padding: 89px 18px 48px; }
    .gc-tile-bank { grid-template-columns: repeat(3, 1fr); }
    .gc-sentence-card { padding: 26px 22px; }
}