:root {
    --bg: #0d1117;
    --panel: #161b22;
    --panel-2: #21262d;
    --border: #30363d;
    --text: #c9d1d9;
    --muted: #8b949e;
    --accent: #58a6ff;
    --accent-2: #a371f7;
    --ok: #3fb950;
    --warn: #e3a816;
    --bad: #f85149;
}

* { box-sizing: border-box; }
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Courier New', Courier, monospace;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.screen { width: 100%; min-height: 100vh; }
.hidden { display: none !important; }

/* ---------- Login ---------- */
#login-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(ellipse at top, rgba(88, 166, 255, 0.08), transparent 60%),
                radial-gradient(ellipse at bottom, rgba(163, 113, 247, 0.08), transparent 60%),
                var(--bg);
}
.login-box {
    background-color: var(--panel);
    padding: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
    width: 380px;
    max-width: 92vw;
}
.login-box h1 {
    color: var(--accent);
    margin: 0 0 4px;
    font-size: 1.9rem;
    letter-spacing: 0.04em;
}
.tagline {
    color: var(--muted);
    margin: 0 0 22px;
    font-size: 0.9rem;
}
#handle-input {
    width: 100%;
    padding: 11px 12px;
    margin: 0 0 14px;
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95rem;
}
#btn-login {
    width: 100%;
    background-color: #238636;
    color: white;
    border: none;
    padding: 11px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
}
#btn-login:hover { background-color: #2ea043; }

.btn-secondary {
    display: block;
    width: 100%;
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--border);
    padding: 9px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    margin-top: 10px;
}
.btn-secondary:hover { color: var(--text); border-color: var(--muted); }

.admin-link {
    display: inline-block;
    margin-top: 18px;
    color: #6e7681;
    font-size: 0.78rem;
    text-decoration: none;
    letter-spacing: 0.06em;
}
.admin-link:hover { color: var(--accent); }

/* ---------- Board ---------- */
.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background-color: var(--panel);
    border-bottom: 1px solid var(--border);
}
.header-left h1 {
    margin: 0;
    font-size: 1.4rem;
    color: var(--accent);
}
.status { font-size: 0.85rem; margin-top: 4px; color: var(--muted); }
.status span { color: var(--ok); font-weight: bold; }

.header-right { display: flex; gap: 10px; }
#btn-leaderboard {
    background-color: #1f6feb;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
}
#btn-leaderboard:hover { background-color: #388bfd; }
#btn-logout { width: auto; margin: 0; padding: 8px 14px; }

.board-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 24px;
    background-color: var(--panel);
    border-bottom: 1px solid var(--border);
    align-items: center;
}
.board-toolbar input[type="text"],
.board-toolbar select {
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 7px 10px;
    font-family: inherit;
    font-size: 0.88rem;
}
.board-toolbar input[type="text"] { min-width: 240px; }
.toggle { display: flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--muted); cursor: pointer; }

.puzzle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    padding: 24px;
}

.puzzle-card {
    background-color: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    cursor: pointer;
    transition: border-color 0.15s, transform 0.15s;
    display: flex;
    flex-direction: column;
    gap: 10px;
    position: relative;
}
.puzzle-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.puzzle-card.solved {
    border-color: var(--ok);
    background-color: rgba(63, 185, 80, 0.06);
}
.puzzle-card.solved::after {
    content: "✓ SOLVED";
    position: absolute;
    top: 12px;
    right: 12px;
    color: var(--ok);
    font-size: 0.72rem;
    font-weight: bold;
    letter-spacing: 0.08em;
}
.puzzle-card h3 {
    margin: 0;
    color: var(--accent);
    font-size: 1.05rem;
    padding-right: 70px;
}
.puzzle-card .meta { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
    display: inline-block;
    background-color: var(--panel-2);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 3px 9px;
    border-radius: 12px;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}
.chip-lang { color: var(--accent-2); border-color: rgba(163, 113, 247, 0.4); }
.chip-points { color: var(--warn); border-color: rgba(227, 168, 22, 0.4); font-weight: bold; }
.chip-diff-easy { color: var(--ok); border-color: rgba(63, 185, 80, 0.4); }
.chip-diff-medium { color: var(--warn); border-color: rgba(227, 168, 22, 0.4); }
.chip-diff-hard { color: var(--bad); border-color: rgba(248, 81, 73, 0.4); }
.chip-diff-insane { color: #ff7b72; border-color: #ff7b72; }

.puzzle-card .footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--muted);
}

/* ---------- Modal ---------- */
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.75);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    padding: 20px;
}
.modal-content {
    background-color: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 28px;
    width: 600px;
    max-width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}
.puzzle-modal-content { width: 720px; }
.modal-content h2 { color: var(--accent); margin: 8px 0 14px; }
.close-btn {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--muted);
}
.close-btn:hover { color: var(--bad); }

.puzzle-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.puzzle-description {
    white-space: pre-wrap;
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px;
    font-size: 0.92rem;
    line-height: 1.55;
}

.puzzle-image-wrap {
    margin-top: 14px;
    text-align: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
}
.puzzle-image-wrap img { max-width: 100%; max-height: 360px; border-radius: 4px; }

.puzzle-file-wrap { margin-top: 12px; }
.puzzle-file-wrap a {
    display: inline-block;
    background-color: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 14px;
    color: var(--accent);
    text-decoration: none;
    font-size: 0.88rem;
}
.puzzle-file-wrap a:hover { border-color: var(--accent); }

/* Hints */
.hints-section { margin-top: 22px; }
.hints-section h3 {
    margin: 0 0 10px;
    color: var(--warn);
    font-size: 1rem;
}
.hints-help { color: var(--muted); font-weight: normal; font-size: 0.78rem; margin-left: 6px; }
.hint-row {
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.hint-row.unlocked { border-color: rgba(227, 168, 22, 0.5); background-color: rgba(227, 168, 22, 0.05); }
.hint-row .hint-text { font-size: 0.9rem; flex: 1; }
.hint-row .hint-text.locked { color: var(--muted); font-style: italic; }
.hint-row button {
    background-color: var(--panel-2);
    color: var(--warn);
    border: 1px solid rgba(227, 168, 22, 0.4);
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    white-space: nowrap;
}
.hint-row button:hover:not(:disabled) { background-color: rgba(227, 168, 22, 0.12); }
.hint-row button:disabled { opacity: 0.55; cursor: not-allowed; }

/* Submit */
.submit-section { margin-top: 22px; }
.submit-section label { font-size: 0.85rem; color: var(--muted); }
.submit-row { display: flex; gap: 10px; margin-top: 6px; }
#flag-input {
    flex: 1;
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    font-family: inherit;
    font-size: 0.95rem;
}
#btn-submit-flag {
    background-color: #238636;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
}
#btn-submit-flag:hover { background-color: #2ea043; }

.submit-feedback {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
}
.submit-feedback.correct {
    background-color: rgba(63, 185, 80, 0.1);
    border: 1px solid var(--ok);
    color: var(--ok);
}
.submit-feedback.wrong {
    background-color: rgba(248, 81, 73, 0.1);
    border: 1px solid var(--bad);
    color: var(--bad);
}

/* Leaderboard */
table { width: 100%; border-collapse: collapse; }
th, td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}
th { background-color: var(--bg); color: var(--muted); }

.reset-section {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
    text-align: center;
}
.btn-reset-toggle {
    background: transparent;
    color: #6e7681;
    border: 1px solid var(--border);
    padding: 5px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8rem;
}
.btn-reset-toggle:hover { color: var(--bad); border-color: var(--bad); }
.reset-form {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    justify-content: center;
    align-items: center;
}
.reset-form input[type="password"] {
    padding: 6px 10px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.88rem;
    width: 150px;
}
.btn-reset-confirm {
    background: #da3633;
    color: white;
    border: none;
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: bold;
}
.btn-reset-confirm:hover { background: var(--bad); }
.reset-message {
    margin: 10px 0 0;
    font-size: 0.85rem;
    font-weight: bold;
}
.reset-message.ok { color: var(--ok); }
.reset-message.err { color: var(--bad); }

/* ---------- Admin ---------- */
.admin-container { max-width: 1100px; margin: 0 auto; padding: 24px; }
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 22px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.admin-header h1 { color: var(--accent); margin: 0; }
.admin-header a { color: var(--muted); text-decoration: none; font-size: 0.85rem; }

.admin-grid {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 24px;
}

.admin-list {
    background-color: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
}
.admin-list h2 { margin: 0 0 12px; font-size: 1rem; color: var(--muted); letter-spacing: 0.05em; }
.admin-list .new-btn {
    width: 100%;
    background-color: #238636;
    color: white;
    border: none;
    padding: 9px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
    margin-bottom: 10px;
}
.admin-list .new-btn:hover { background-color: #2ea043; }
.admin-list .puzzle-row {
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 6px;
    cursor: pointer;
    background-color: var(--bg);
}
.admin-list .puzzle-row:hover { border-color: var(--accent); }
.admin-list .puzzle-row.active { border-color: var(--accent); background-color: var(--panel-2); }
.admin-list .puzzle-row .title { font-size: 0.9rem; color: var(--accent); }
.admin-list .puzzle-row .sub { font-size: 0.75rem; color: var(--muted); margin-top: 3px; }

.admin-editor {
    background-color: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}
.admin-editor h2 { margin: 0 0 16px; color: var(--accent); font-size: 1.1rem; }
.field { margin-bottom: 14px; }
.field label {
    display: block;
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.field input[type="text"],
.field input[type="number"],
.field select,
.field textarea {
    width: 100%;
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    font-family: inherit;
    font-size: 0.9rem;
}
.field textarea { min-height: 110px; resize: vertical; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.checkbox-field { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--muted); }

.hints-editor { background-color: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 12px; }
.hints-editor h3 { margin: 0 0 10px; font-size: 0.85rem; color: var(--warn); letter-spacing: 0.06em; }
.hint-edit-row {
    display: grid;
    grid-template-columns: 1fr 80px auto;
    gap: 8px;
    margin-bottom: 8px;
    align-items: center;
}
.hint-edit-row input {
    background-color: var(--panel);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 6px 8px;
    font-family: inherit;
    font-size: 0.85rem;
}
.hint-edit-row button {
    background: transparent;
    color: var(--bad);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 5px 9px;
    cursor: pointer;
    font-family: inherit;
}
.hint-edit-row button:hover { border-color: var(--bad); }
.add-hint-btn {
    background-color: var(--panel-2);
    color: var(--warn);
    border: 1px dashed rgba(227, 168, 22, 0.5);
    border-radius: 6px;
    padding: 7px 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    margin-top: 6px;
}

.upload-row { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; }
.upload-row input[type="file"] { color: var(--muted); font-size: 0.85rem; }
.upload-row button {
    background-color: var(--panel-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 7px 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
}
.upload-status { font-size: 0.8rem; color: var(--muted); }
.upload-preview { margin-top: 6px; max-width: 220px; max-height: 140px; border: 1px solid var(--border); border-radius: 4px; }

.editor-actions {
    display: flex;
    gap: 10px;
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}
.btn-save {
    background-color: #238636;
    color: white;
    border: none;
    padding: 10px 22px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
}
.btn-save:hover { background-color: #2ea043; }
.btn-delete {
    background-color: var(--bad);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    margin-left: auto;
}
.btn-delete:hover { background-color: #ff6b66; }

#admin-gate {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
#admin-gate .login-box h1 { color: var(--warn); }
#admin-gate input { width: 100%; }

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--panel);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 6px;
    padding: 12px 18px;
    font-size: 0.88rem;
    z-index: 100;
    box-shadow: 0 4px 14px rgba(0,0,0,0.4);
}
.toast.ok { border-left-color: var(--ok); }
.toast.err { border-left-color: var(--bad); }

/* Music Player Widget */
.music-widget {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}
.music-toggle {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 2px solid var(--border);
    background: var(--panel);
    color: var(--accent-2);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s, border-color 0.15s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
.music-toggle:hover { border-color: var(--accent-2); transform: scale(1.08); }
.music-panel {
    width: 300px;
    border-radius: 8px;
    overflow: hidden;
    display: none;
    box-shadow: 0 4px 16px rgba(0,0,0,0.5);
    border: 1px solid var(--border);
}
.music-panel.open { display: block; }