:root {
    --bg: #0e1116;
    --panel: #161b22;
    --border: #2a313c;
    --fg: #d6dae0;
    --dim: #8b949e;
    --accent: #58a6ff;
    --system: #7ee787;
    --helper: #d2a8ff;
    --error: #ff7b72;
    --self: #79c0ff;
    --accent2: #d2a8ff;
    --accent3: #7ee787;
    --grad: linear-gradient(100deg, var(--accent), var(--accent2) 55%, var(--accent3));
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

* { box-sizing: border-box; }

/* ID セレクタの display 指定が [hidden] に勝ってしまうので明示的に打ち消す */
[hidden] { display: none !important; }

html {
    height: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100%;
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
    font-size: 15px;
}

/* ---------- 参加画面 ---------- */

#join-screen {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    background:
        radial-gradient(900px 520px at 10% -12%, rgba(88, 166, 255, 0.18), transparent 62%),
        radial-gradient(760px 520px at 94% 4%, rgba(210, 168, 255, 0.15), transparent 60%),
        var(--bg);
}

.panel {
    width: 100%;
    max-width: 460px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px;
}

.panel h2 {
    margin: 0 0 8px;
    font-size: 20px;
}

.lead {
    margin: 0 0 18px;
    color: var(--dim);
    font-size: 13px;
    line-height: 1.6;
}

.lead code {
    font-family: var(--mono);
    background: #0b0e13;
    padding: 1px 5px;
    border-radius: 4px;
}

.warn {
    margin: 0 0 20px;
    padding: 12px 14px;
    border: 1px solid #6b3d10;
    background: #2a1a08;
    border-radius: 8px;
    color: #f0b072;
    font-size: 12.5px;
    line-height: 1.7;
}

#join-form {
    display: flex;
    flex-direction: column;
}

#join-form label {
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--dim);
}

#join-form input {
    margin-bottom: 16px;
    padding: 9px 11px;
    background: #0b0e13;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--fg);
    font-size: 14px;
    font-family: inherit;
}

#join-form input:focus,
#msg-input:focus {
    outline: none;
    border-color: var(--accent);
}

button {
    padding: 9px 16px;
    background: #21304a;
    border: 1px solid #35507d;
    border-radius: 6px;
    color: var(--fg);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
}

button:hover:not(:disabled) { background: #2b3f63; }
button:disabled { opacity: 0.5; cursor: default; }

.join-error {
    margin: 0 0 12px;
    color: var(--error);
    font-size: 13px;
}

.note {
    margin: 18px 0 0;
    color: var(--dim);
    font-size: 12px;
    line-height: 1.7;
}

/* ---------- ホーム画面 (ランディング) ---------- */

#site-header {
    position: sticky;
    top: 0;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px clamp(14px, 4vw, 32px);
    background: rgba(14, 17, 22, 0.78);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 9px;
    color: var(--fg);
    text-decoration: none;
    font-family: var(--mono);
    font-size: 14px;
    letter-spacing: 0.12em;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 7px;
    background: var(--grad);
    color: #0b0e13;
    font-family: var(--mono);
    font-weight: 700;
    font-size: 15px;
}

#site-nav {
    display: flex;
    align-items: center;
    gap: clamp(10px, 2.5vw, 22px);
    font-size: 13px;
}

#site-nav a {
    color: var(--dim);
    text-decoration: none;
}

#site-nav a:hover { color: var(--accent); }

#site-nav .nav-gh {
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--fg);
}

#site-nav .nav-gh:hover {
    border-color: var(--accent);
    color: var(--accent);
}

#landing { flex: 1; }

.section {
    width: min(1080px, 100% - clamp(28px, 8vw, 64px));
    margin: 0 auto;
    padding: clamp(40px, 7vw, 76px) 0;
}

#hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 460px);
    gap: clamp(28px, 5vw, 56px);
    align-items: center;
    padding-top: clamp(28px, 5vw, 56px);
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--accent3);
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.16em;
}

#hero-copy h1 {
    margin: 0 0 18px;
    font-size: clamp(30px, 5.2vw, 50px);
    line-height: 1.22;
    letter-spacing: 0.01em;
}

.grad {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-lead {
    margin: 0 0 20px;
    max-width: 46ch;
    color: var(--dim);
    font-size: 15px;
    line-height: 1.85;
}

.hero-lead strong { color: var(--fg); }

.hero-lead code,
.section-lead code,
.section-note code,
.card code {
    font-family: var(--mono);
    background: #0b0e13;
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.92em;
}

.hero-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 26px;
    padding: 0;
    list-style: none;
}

.hero-points li {
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(22, 27, 34, 0.7);
    color: var(--dim);
    font-size: 12.5px;
}

.scroll-hint {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    text-decoration: none;
    font-size: 13px;
}

.scroll-hint span {
    display: inline-block;
    animation: nudge 1.8s ease-in-out infinite;
}

@keyframes nudge {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

.section-title {
    margin: 0 0 10px;
    font-size: clamp(20px, 3vw, 27px);
}

.section-title::before {
    content: "// ";
    color: var(--accent);
    font-family: var(--mono);
}

.section-lead,
.section-note {
    margin: 0 0 22px;
    color: var(--dim);
    font-size: 13.5px;
    line-height: 1.85;
}

.section-note {
    margin: 18px 0 0;
    font-size: 12.5px;
}

.section-note strong { color: var(--fg); }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 16px;
}

.card {
    padding: 22px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.card:hover { border-color: #3b4a60; }

.card-icon {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    margin-bottom: 12px;
    border-radius: 9px;
    background: rgba(88, 166, 255, 0.12);
    border: 1px solid var(--border);
    color: var(--accent);
}

.card:nth-child(2) .card-icon { background: rgba(210, 168, 255, 0.12); color: var(--accent2); }
.card:nth-child(3) .card-icon { background: rgba(126, 231, 135, 0.12); color: var(--accent3); }

.card h3 {
    margin: 0 0 8px;
    font-size: 15px;
}

.card p {
    margin: 0;
    color: var(--dim);
    font-size: 13px;
    line-height: 1.8;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel);
}

#command-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

#command-table th,
#command-table td {
    padding: 11px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

#command-table thead th {
    color: var(--dim);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    background: rgba(11, 14, 19, 0.6);
}

#command-table tbody th {
    font-weight: 400;
    white-space: nowrap;
}

#command-table tbody th code {
    font-family: var(--mono);
    color: var(--accent2);
    font-size: 12.5px;
}

#command-table tbody td { color: var(--dim); }

#command-table tbody tr:last-child th,
#command-table tbody tr:last-child td { border-bottom: none; }

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.shot {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 0;
    padding: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.shot img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    border-radius: 8px;
    background: #08090c;
}

.shot figcaption {
    color: var(--dim);
    font-size: 12px;
    line-height: 1.7;
    text-align: center;
}

.shot code {
    font-family: var(--mono);
    font-size: 0.95em;
}

/* ---------- フッター ---------- */

#site-footer {
    border-top: 1px solid var(--border);
    background: rgba(11, 14, 19, 0.55);
}

/* 動く ASCII イラスト */
#ascii-anim {
    margin: 0;
    padding: 14px 0 6px;
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1.05;
    white-space: pre;
    overflow: hidden;
    user-select: none;
    pointer-events: none;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: 0.85;
    -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.25), #000 45%, rgba(0, 0, 0, 0.2));
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.25), #000 45%, rgba(0, 0, 0, 0.2));
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 24px;
    width: min(1080px, 100% - clamp(28px, 8vw, 64px));
    margin: 0 auto;
    padding: 18px 0 34px;
}

.footer-brand {
    max-width: 46ch;
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.1em;
}

.footer-note {
    margin: 10px 0 0;
    color: var(--dim);
    font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
    font-size: 12px;
    line-height: 1.8;
    letter-spacing: normal;
}

.footer-note code {
    font-family: var(--mono);
    font-size: 0.95em;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 9px;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 13px;
}

.footer-links a {
    color: var(--dim);
    text-decoration: none;
}

.footer-links a:hover { color: var(--accent); }

@media (max-width: 860px) {
    #hero {
        grid-template-columns: minmax(0, 1fr);
    }

    .panel { max-width: none; }

    #site-nav a:not(.nav-gh) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .scroll-hint span { animation: none; }
}

/* ---------- チャット画面 ---------- */

#chat-screen {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
}

#status-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    align-items: center;
    padding: 9px 14px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    font-size: 12.5px;
    color: var(--dim);
}

#status-route { margin-left: auto; }

#reconnect-button { padding: 4px 12px; font-size: 12.5px; }

#log {
    flex: 1;
    overflow-y: auto;
    padding: 14px;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.5;
}

.line {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    margin-bottom: 2px;
}

.line.system { color: var(--system); }
.line.helper { color: var(--helper); }
.line.error  { color: var(--error); }
.line.msg .sender { color: var(--dim); }
.line.msg.self .sender { color: var(--self); }

/* ASCII ART は行間を詰めないと絵が崩れる */
pre.art {
    margin: 4px 0 8px;
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1;
    letter-spacing: 0;
    white-space: pre;
    overflow-x: auto;
    max-height: 70vh;
    overflow-y: auto;
    padding: 8px;
    background: #08090c;
    border: 1px solid var(--border);
    border-radius: 6px;
}

#staged {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    background: #12202f;
    border-top: 1px solid var(--border);
    font-size: 12.5px;
}

.staged-label { color: var(--dim); }
#staged-name { font-family: var(--mono); }
#staged-clear { padding: 0 8px; line-height: 1.6; }

#busy {
    margin: 0;
    padding: 7px 14px;
    background: #2a2408;
    border-top: 1px solid #6b5d10;
    color: #e3c766;
    font-size: 12.5px;
}

#input-row {
    display: flex;
    gap: 8px;
    padding: 10px 14px;
    background: var(--panel);
    border-top: 1px solid var(--border);
}

#msg-input {
    flex: 1;
    padding: 9px 11px;
    background: #0b0e13;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--fg);
    font-family: var(--mono);
    font-size: 13px;
}

#msg-input:disabled { opacity: 0.6; }

#drop-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 17, 22, 0.85);
    border: 3px dashed var(--accent);
    color: var(--accent);
    font-size: 18px;
    pointer-events: none;
    z-index: 10;
}