@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=JetBrains+Mono:wght@400;600&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f13; --surface: #17171f; --surface2: #1e1e28; --border: #2a2a38;
  --accent: #7c6af7; --text: #e8e8f0; --text-dim: #888899;
  --danger: #f76a6a; --success: #6af7a0; --warning: #f7c46a;
  --mono: 'JetBrains Mono', monospace; --sans: 'Noto Sans JP', sans-serif;
}

/* ===== Layout ===== */
body { font-family: var(--sans); background: var(--bg); color: var(--text); min-height: 100vh; line-height: 1.6; }
#app { max-width: 800px; margin: 0 auto; padding: 0 16px 64px; }

/* ===== Header ===== */
header { display: flex; align-items: center; justify-content: space-between; padding: 20px 0 16px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.logo { font-family: var(--mono); font-size: 1.1rem; font-weight: 600; color: var(--accent); letter-spacing: 0.05em; }
.logo span { color: var(--text-dim); }
.user-bar { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; flex-wrap: wrap; }
.username-badge { background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }

/* ===== Pages ===== */
.page { display: none; }
.page.active { display: block; }

/* ===== Card ===== */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 28px; }

/* ===== Forms ===== */
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 0.78rem; font-weight: 500; color: var(--text-dim); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.06em; }
input, textarea, select { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; color: var(--text); font-family: var(--sans); font-size: 0.95rem; transition: border-color 0.15s; resize: vertical; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); }
textarea { min-height: 100px; }
select option { background: var(--surface); }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 20px; border-radius: 8px; font-size: 0.88rem; font-weight: 600; cursor: pointer; border: none; transition: opacity 0.15s, transform 0.1s; font-family: var(--sans); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; width: 100%; justify-content: center; }
.btn-primary:hover:not(:disabled) { background: #8d7ef9; }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid transparent; padding: 6px 12px; font-size: 0.82rem; }
.btn-danger:hover { border-color: var(--danger); }
.btn-sm { padding: 6px 14px; font-size: 0.82rem; }

/* ===== Tabs ===== */
.tabs { display: flex; margin-bottom: 24px; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.tab-btn { flex: 1; padding: 10px; background: transparent; border: none; color: var(--text-dim); font-family: var(--sans); font-size: 0.88rem; font-weight: 600; cursor: pointer; transition: background 0.15s, color 0.15s; }
.tab-btn.active { background: var(--accent); color: #fff; }
.tab-btn:not(.active):hover { background: var(--surface2); }

/* ===== Alerts ===== */
.alert { padding: 10px 14px; border-radius: 8px; font-size: 0.88rem; margin-bottom: 16px; }
.alert-error { background: rgba(247,106,106,0.12); color: var(--danger); border: 1px solid rgba(247,106,106,0.25); }
.alert-success { background: rgba(106,247,160,0.12); color: var(--success); border: 1px solid rgba(106,247,160,0.25); }

/* ===== Search & Filters ===== */
.toolbar { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.search-wrap { flex: 1; min-width: 200px; position: relative; }
.search-wrap input { padding-left: 36px; }
.search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-dim); font-size: 0.9rem; pointer-events: none; }
.category-filters { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.cat-btn { padding: 5px 14px; border-radius: 20px; border: 1px solid var(--border); background: transparent; color: var(--text-dim); font-size: 0.8rem; font-family: var(--sans); cursor: pointer; transition: all 0.15s; }
.cat-btn:hover { border-color: var(--accent); color: var(--text); }
.cat-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.cat-badge { display: inline-block; font-size: 0.68rem; font-family: var(--mono); padding: 2px 7px; border-radius: 4px; background: var(--surface2); color: var(--text-dim); border: 1px solid var(--border); margin-right: 6px; vertical-align: middle; }

/* ===== Thread list ===== */
.thread-list { display: flex; flex-direction: column; gap: 10px; }
.thread-item { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; cursor: pointer; transition: border-color 0.15s, background 0.15s; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.thread-item:hover { border-color: var(--accent); background: var(--surface2); }
.thread-title { font-weight: 700; font-size: 0.98rem; margin-bottom: 4px; }
.thread-meta { font-size: 0.76rem; color: var(--text-dim); font-family: var(--mono); }
.thread-count { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); white-space: nowrap; }
.new-thread-btn-wrap { margin-bottom: 16px; }

/* ===== Pagination ===== */
.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 20px; }
.pagination button { padding: 6px 14px; border-radius: 8px; border: 1px solid var(--border); background: transparent; color: var(--text-dim); font-family: var(--mono); font-size: 0.82rem; cursor: pointer; transition: all 0.15s; }
.pagination button:hover:not(:disabled) { border-color: var(--accent); color: var(--text); }
.pagination button:disabled { opacity: 0.35; cursor: not-allowed; }
.pagination .page-info { font-family: var(--mono); font-size: 0.8rem; color: var(--text-dim); }

/* ===== Thread detail ===== */
.thread-header { margin-bottom: 20px; display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.thread-header-info h1 { font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; }
.thread-header-info .meta { font-size: 0.82rem; color: var(--text-dim); font-family: var(--mono); }
.back-btn { margin-bottom: 20px; }

/* ===== Posts ===== */
.post-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.post-item { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px; }
.post-item:target { border-color: var(--accent); }
.post-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.post-num { font-family: var(--mono); font-size: 0.75rem; color: var(--text-dim); }
.post-author { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); font-weight: 600; }
.post-date { font-size: 0.75rem; color: var(--text-dim); font-family: var(--mono); }
.post-edited { font-size: 0.7rem; color: var(--warning); font-family: var(--mono); }
.post-actions { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.post-body { font-size: 0.93rem; line-height: 1.7; white-space: pre-wrap; word-break: break-word; }

/* ===== Like button ===== */
.like-btn { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 20px; border: 1px solid var(--border); background: transparent; color: var(--text-dim); font-size: 0.78rem; font-family: var(--mono); cursor: pointer; transition: all 0.15s; }
.like-btn:hover { border-color: #f76a8a; color: #f76a8a; }
.like-btn.liked { border-color: #f76a8a; color: #f76a8a; background: rgba(247,106,138,0.1); }
.like-btn .heart { font-size: 0.85rem; }

/* ===== Reply area ===== */
.reply-area { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }

/* ===== States ===== */
.loading { text-align: center; padding: 48px; color: var(--text-dim); font-family: var(--mono); font-size: 0.85rem; }
.empty { text-align: center; padding: 48px; color: var(--text-dim); font-size: 0.9rem; }
.auth-required { background: var(--surface); border: 1px dashed var(--border); border-radius: 10px; padding: 20px; text-align: center; color: var(--text-dim); font-size: 0.9rem; }
.auth-required a { color: var(--accent); cursor: pointer; text-decoration: underline; }

/* ===== Modals ===== */
.modal-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 100; align-items: center; justify-content: center; padding: 16px; }
.modal-backdrop.open { display: flex; }
.modal { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 28px; width: 100%; max-width: 480px; }
.modal h2 { font-size: 1rem; font-family: var(--mono); color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 20px; }
.modal-actions { display: flex; gap: 10px; margin-top: 20px; }
.modal-actions .btn { flex: 1; justify-content: center; }