/* ==========================================================================
   リアルタイムビンゴ — Landing (Design Comp "A: Classic Vertical")
   黒板×チョーク／フレームなし／SVGノイズテクスチャ
   ========================================================================== */

:root {
    --bg-board: #0e3326;
    --bg-board-deep: #082019;
    --bg-board-light: #1a4a38;
    --chalk: #f6f1e2;
    --chalk-mid: rgba(246, 241, 226, 0.6);
    --chalk-dim: rgba(246, 241, 226, 0.3);
    --chalk-faint: rgba(246, 241, 226, 0.18);
    --col-b: #6ec8ff;
    --col-i: #ff7a6e;
    --col-n: #95e07a;
    --col-g: #ffd84a;
    --col-o: #c79bff;
    --accent-yellow: #ffd84a;
    --accent-yellow-dark: #b79a22;
    --accent-coral: #ff7a6e;
    --font-chalk: 'Kalam', 'Marker Felt', 'Comic Sans MS', system-ui, sans-serif;
    --font-score: 'Bebas Neue', 'Arial Black', sans-serif;
    --font-jp: 'Noto Sans JP', system-ui, -apple-system, sans-serif;
}

/* ── 黒板（フレームなし）── */
.board-canvas {
    position: relative;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(255,255,255,0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.02) 0%, transparent 40%),
        var(--bg-board);
    border-radius: 14px;
    padding: 48px 40px 36px;
    margin-bottom: var(--spacing-lg);
    color: var(--chalk);
    font-family: var(--font-jp);
    overflow: hidden;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.25);
}
.board-canvas::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
    opacity: 0.6;
}
.board-canvas > * { position: relative; z-index: 1; }

/* ── ヘッダー（Landing A）── */
.brand-overline {
    font-family: var(--font-chalk);
    font-size: 0.8rem;
    color: var(--chalk-mid);
    letter-spacing: 1px;
    text-align: center;
    margin-bottom: 8px;
}
.brand-title {
    font-family: var(--font-score);
    font-size: clamp(2.5rem, 6vw, 3.4rem);
    letter-spacing: 4px;
    line-height: 1.1;
    text-align: center;
    margin: 0;
}
.brand-title .B { color: var(--col-b); }
.brand-title .I { color: var(--col-i); }
.brand-title .N { color: var(--col-n); }
.brand-title .G { color: var(--col-g); }
.brand-title .O { color: var(--col-o); }
.brand-title .suffix { color: var(--chalk); margin-left: 14px; }

.brand-sub {
    font-family: var(--font-jp);
    font-size: 1.05rem;
    color: var(--chalk-mid);
    font-weight: 500;
    text-align: center;
    margin: 10px 0 0;
}

/* ── 3ステップ（横並び／色付き円＋BEBASラベル）── */
.step-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    margin: 40px 0 28px;
    position: relative;
}
.step-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    position: relative;
}
.step-circle {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: 2.5px solid var(--chalk);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-score);
    font-size: 1.7rem;
}
.step-col--1 .step-circle { border-color: var(--col-b); color: var(--col-b); }
.step-col--2 .step-circle { border-color: var(--col-g); color: var(--col-g); }
.step-col--3 .step-circle { border-color: var(--col-o); color: var(--col-o); }

.step-label {
    font-family: var(--font-score);
    font-size: 1.35rem;
    letter-spacing: 2px;
}
.step-col--1 .step-label { color: var(--col-b); }
.step-col--2 .step-label { color: var(--col-g); }
.step-col--3 .step-label { color: var(--col-o); }

.step-desc {
    font-family: var(--font-jp);
    font-size: 0.95rem;
    color: var(--chalk-mid);
    line-height: 1.55;
    max-width: 200px;
}

.step-arrow {
    position: absolute;
    top: 22px;
    font-family: var(--font-chalk);
    font-size: 1.6rem;
    color: var(--chalk-dim);
    pointer-events: none;
}
.step-arrow--1 { left: 33.33%; transform: translateX(-50%); }
.step-arrow--2 { left: 66.66%; transform: translateX(-50%); }

/* ── CTAボタン（チョーク調／下影で立体）── */
.chalk-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent-yellow);
    color: #1a1a1a;
    font-family: var(--font-chalk);
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: 0.5px;
    padding: 16px 48px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 5px 0 var(--accent-yellow-dark), 0 8px 16px rgba(0, 0, 0, 0.3);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
    transition: transform 0.12s, box-shadow 0.12s;
    text-decoration: none;
}
.chalk-cta:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 7px 0 var(--accent-yellow-dark), 0 12px 22px rgba(0, 0, 0, 0.35);
}
.chalk-cta:active:not(:disabled) {
    transform: translateY(3px);
    box-shadow: 0 2px 0 var(--accent-yellow-dark), 0 4px 10px rgba(0, 0, 0, 0.3);
}
.chalk-cta:disabled { opacity: 0.5; cursor: not-allowed; }

.chalk-cta--outline {
    background: transparent;
    color: var(--chalk);
    border: 2px dashed var(--chalk-mid);
    box-shadow: none;
    font-size: 1.1rem;
    padding: 12px 32px;
}
.chalk-cta--outline:hover:not(:disabled) {
    background: rgba(246, 241, 226, 0.08);
    transform: none;
    box-shadow: none;
}

.cta-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    margin: 8px 0 20px;
}

/* ── フィーチャーピル ── */
.feature-pills {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 28px;
}
.feature-pill {
    padding: 8px 20px;
    border: 1.5px dashed var(--chalk-dim);
    border-radius: 6px;
    font-family: var(--font-jp);
    font-size: 0.88rem;
    color: var(--chalk-mid);
}

/* ── エラー ── */
.chalk-err {
    display: none;
    margin-top: 12px;
    color: var(--accent-coral);
    font-family: var(--font-jp);
    font-size: 0.95rem;
    text-align: center;
}
.chalk-err.show { display: block; }

/* ── リンク発行後パネル ── */
.link-hint {
    background: rgba(255, 216, 74, 0.12);
    border: 1.5px dashed var(--accent-yellow);
    border-radius: 10px;
    padding: 12px 18px;
    font-family: var(--font-jp);
    font-size: 0.98rem;
    line-height: 1.6;
    margin-bottom: 18px;
}
.link-hint strong { color: var(--accent-yellow); }

.url-row {
    margin-top: 14px;
    padding: 12px 16px;
    background: rgba(8, 32, 25, 0.5);
    border-left: 3px solid var(--accent-yellow);
    border-radius: 6px;
}
.url-row--student { border-left-color: var(--col-n); }
.url-row label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--chalk);
    font-family: var(--font-score);
    font-size: 0.95rem;
    letter-spacing: 1px;
    margin-bottom: 8px;
}
.url-row--student label { color: var(--col-n); }
.url-input-row {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}
.url-input-row input {
    flex: 1;
    min-width: 0;
    padding: 9px 12px;
    border: 1px solid var(--chalk-faint);
    border-radius: 6px;
    background: rgba(8, 32, 25, 0.65);
    color: var(--chalk);
    font-family: 'SF Mono', Menlo, monospace;
    font-size: 0.85rem;
}
.url-input-row input:focus { outline: 2px solid var(--accent-yellow); }

.mini-btn {
    padding: 9px 14px;
    background: rgba(246, 241, 226, 0.1);
    color: var(--chalk);
    border: 1px solid var(--chalk-faint);
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-chalk);
    font-weight: 700;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: background 0.15s;
}
.mini-btn:hover { background: rgba(246, 241, 226, 0.2); }
.mini-btn--primary {
    background: var(--accent-yellow);
    color: #1a1a1a;
    border-color: var(--accent-yellow);
}
.mini-btn--primary:hover { background: #ffe26b; }

/* ── 使い方（黒板調）── */
.howto {
    background: var(--bg-board);
    color: var(--chalk);
    border-radius: 14px;
    padding: 32px 36px;
    margin-bottom: var(--spacing-lg);
    font-family: var(--font-jp);
    position: relative;
    overflow: hidden;
}
.howto::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}
.howto > * { position: relative; z-index: 1; }
.howto h3 {
    font-family: var(--font-score);
    font-size: 1.6rem;
    letter-spacing: 2px;
    color: var(--accent-yellow);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.howto ol {
    list-style: none;
    counter-reset: howto-step;
    padding: 0;
    margin: 0;
}
.howto li {
    counter-increment: howto-step;
    padding: 10px 0 10px 52px;
    position: relative;
    line-height: 1.7;
    color: var(--chalk);
    font-size: 1rem;
    border-bottom: 1px dashed var(--chalk-faint);
}
.howto li:last-child { border-bottom: none; }
.howto li::before {
    content: counter(howto-step);
    position: absolute;
    left: 0; top: 10px;
    width: 34px; height: 34px;
    border-radius: 50%;
    border: 2px solid var(--chalk);
    color: var(--chalk);
    font-family: var(--font-score);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}
.howto li strong { color: var(--accent-yellow); }

/* ── QR全画面オーバーレイ ── */
.fullscreen-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(14, 51, 38, 0.96);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}
.fullscreen-overlay.active { display: flex; }
.fullscreen-overlay::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
}
.qr-stage {
    text-align: center;
    color: var(--chalk);
    font-family: var(--font-chalk);
    padding: 40px;
    z-index: 1;
}
.qr-stage h2 {
    font-family: var(--font-score);
    font-size: 2.4em;
    letter-spacing: 4px;
    color: var(--accent-yellow);
    margin-bottom: 24px;
}
.qr-frame {
    background: var(--chalk);
    padding: 22px;
    display: inline-block;
    border-radius: 10px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}
.qr-url {
    margin-top: 22px;
    font-family: 'SF Mono', Menlo, monospace;
    font-size: 0.9em;
    color: var(--chalk-mid);
    word-break: break-all;
    max-width: 80%;
    margin-left: auto;
    margin-right: auto;
}
.exit-fullscreen-btn {
    position: absolute;
    top: 22px;
    right: 22px;
    background: rgba(246, 241, 226, 0.15);
    border: 1.5px solid var(--chalk-mid);
    color: var(--chalk);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    font-family: var(--font-chalk);
    font-size: 1em;
    font-weight: 700;
    z-index: 2;
}
.exit-fullscreen-btn:hover { background: rgba(246, 241, 226, 0.25); }

/* ── プライバシーバッジ ── */
.privacy-badge.chalk-tone {
    background: rgba(14, 51, 38, 0.06);
    border-color: rgba(14, 51, 38, 0.18);
    color: #14442f;
}

/* ── レスポンシブ ── */
@media (max-width: 768px) {
    .board-canvas { padding: 32px 22px 24px; }
    .howto { padding: 22px 20px; }
    .step-row { grid-template-columns: 1fr; gap: 18px; }
    .step-arrow { display: none; }
    .brand-title { font-size: 2.4rem; letter-spacing: 3px; }
    .chalk-cta { font-size: 1.15rem; padding: 14px 36px; }
    .feature-pills { gap: 10px; }
}