:root {
  --primary: #0b57d0;
  --primary-dark: #0842a0;
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #1f1f1f;
  --muted: #5f6368;
  --line: #e0e3e7;
  --liked: #e8710a;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Google Sans", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.site-header { position: sticky; top: 0; background: rgba(255,255,255,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); z-index: 10; }
.header-inner { max-width: 1080px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 10px; }
.logo { font-size: 24px; font-weight: 700; color: var(--text); }
.logo:hover { text-decoration: none; }
.logo-sub { color: var(--muted); font-size: 12px; }
.header-nav { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.nav-user { display: inline-flex; align-items: center; gap: 7px; color: var(--text); font-weight: 600; }
.nav-link { color: var(--muted); font-size: 14px; }
.avatar { border-radius: 50%; object-fit: cover; vertical-align: middle; }
.avatar-fallback { display: inline-flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; }
.btn { display: inline-block; padding: 10px 22px; border-radius: 999px; border: 1px solid transparent; font-size: 15px; font-weight: 600; cursor: pointer; background: #fff; color: var(--text); }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { border-color: var(--line); color: var(--primary); }
.btn-ghost:hover { background: #f0f4f9; }
.btn-liked { background: #fef7e0; border-color: var(--liked); color: var(--liked); }
.btn-sm { padding: 7px 16px; font-size: 14px; }
.hero { text-align: center; padding: 56px 16px 30px; }
.hero h1 { font-size: clamp(26px, 5vw, 40px); margin: 0 0 14px; }
.hero p { color: var(--muted); line-height: 1.8; margin: 0; }
.hero-cta { margin-top: 22px !important; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.sort-tabs { display: flex; gap: 8px; margin: 10px 0 18px; }
.sort-tabs a { padding: 6px 16px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); background: #fff; font-size: 14px; }
.sort-tabs a.active { background: var(--text); color: #fff; border-color: var(--text); }
.sort-tabs a:hover { text-decoration: none; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; padding-bottom: 40px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: box-shadow .15s, transform .15s; }
.card:hover { box-shadow: 0 6px 24px rgba(0,0,0,.10); transform: translateY(-2px); }
.thumb { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: #eef1f4; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb-fallback { display: flex; align-items: center; justify-content: center; }
.thumb-fallback span { font-size: 56px; color: rgba(255,255,255,.9); font-weight: 700; }
.thumb-fallback:hover, .thumb:hover { text-decoration: none; }
.card-body { padding: 14px 16px 16px; }
.card-title { margin: 0 0 6px; font-size: 17px; }
.card-title a { color: var(--text); }
.card-desc { margin: 0 0 12px; color: var(--muted); font-size: 14px; line-height: 1.6; min-height: 44px; }
.card-meta { display: flex; align-items: center; gap: 8px; }
.author { display: inline-flex; align-items: center; gap: 6px; color: var(--text); font-size: 13px; font-weight: 600; }
.meta-stats { margin-left: auto; display: inline-flex; gap: 10px; color: var(--muted); font-size: 13px; }
.empty { text-align: center; padding: 60px 16px; color: var(--muted); }
.work-detail { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; margin-top: 24px; }
.work-detail h1 { margin: 0 0 10px; font-size: 28px; }
.work-author { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.muted { color: var(--muted); font-size: 13px; }
.work-image { width: 100%; border-radius: 12px; border: 1px solid var(--line); margin-bottom: 18px; }
.work-desc { line-height: 1.9; font-size: 16px; }
.chip-row { margin-top: 14px; display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.chip-label { color: var(--muted); font-size: 13px; margin-right: 2px; }
.chip { background: #f0f4f9; border-radius: 999px; padding: 3px 12px; font-size: 13px; color: #3c4043; }
.work-actions { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.inline-form { display: inline; }
.comments { margin: 28px 0 50px; }
.comments h2 { font-size: 20px; }
.comment { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; }
.comment-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.comment-body { line-height: 1.8; }
.link-btn { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 13px; padding: 0; }
.link-btn:hover { color: #b3261e; }
.comment-form { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; align-items: flex-end; }
textarea, input[type="text"], input[type="url"] { width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; font-family: inherit; background: #fff; }
textarea:focus, input:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: transparent; }
.form-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; margin: 24px auto 50px; max-width: 680px; }
.form-card h1 { margin-top: 0; font-size: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; }
.field .hint { color: var(--muted); font-size: 12px; margin-top: 4px; }
.error-box { background: #fce8e6; color: #a50e0e; border-radius: 10px; padding: 12px 16px; margin-bottom: 18px; font-size: 14px; }
.login-card { max-width: 420px; margin: 48px auto 60px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 32px 28px; text-align: center; }
.login-card h1 { font-size: 22px; margin: 0 0 8px; }
.login-card p { color: var(--muted); font-size: 14px; line-height: 1.7; }
.provider-btn { display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%; padding: 13px; margin-top: 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; font-size: 16px; font-weight: 600; color: var(--text); cursor: pointer; }
.provider-btn:hover { background: #f8f9fa; text-decoration: none; }
.provider-btn img { width: 22px; height: 22px; }
.profile-head { display: flex; gap: 18px; align-items: center; margin: 30px 0 8px; flex-wrap: wrap; }
.profile-head h1 { margin: 0; font-size: 26px; }
.profile-bio { color: #3c4043; line-height: 1.8; margin: 6px 0 20px; white-space: pre-wrap; }
.badge { display: inline-block; background: #e8f0fe; color: var(--primary); border-radius: 999px; padding: 2px 10px; font-size: 12px; font-weight: 600; }
.site-footer { border-top: 1px solid var(--line); padding: 22px 0 30px; color: var(--muted); font-size: 13px; text-align: center; margin-top: 20px; }
.danger-zone { margin-top: 34px; border-top: 1px solid var(--line); padding-top: 18px; }
.btn-danger { background: #b3261e; color: #fff; }

.platform-badge { display: inline-block; background: #e8f0fe; color: var(--primary); border-radius: 6px; padding: 2px 8px; font-size: 12px; font-weight: 700; vertical-align: middle; }
select { width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; font-family: inherit; background: #fff; }
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 16px; }
.modal-overlay[hidden] { display: none; }
.modal-card { background: #fff; border-radius: 16px; padding: 24px; max-width: 420px; width: 100%; box-shadow: 0 12px 40px rgba(0,0,0,.25); }
.modal-message { margin: 0 0 20px; line-height: 1.8; font-size: 15px; white-space: pre-wrap; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ---- about / features / faq ---- */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin: 18px 0 8px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); line-height: 1.8; font-size: 14px; }
.steps { line-height: 2; padding-left: 22px; }
.steps li { margin-bottom: 6px; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-bottom: 10px; }
.faq-item h3 { margin: 0 0 6px; font-size: 16px; }
.faq-item p { margin: 0; color: #3c4043; line-height: 1.8; }
.section-title { font-size: 22px; margin: 34px 0 6px; }
.footer-links { margin-bottom: 6px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.about-hero { text-align: center; padding: 48px 16px 10px; }
.about-hero h1 { font-size: clamp(24px, 5vw, 36px); margin: 0 0 12px; }
.about-hero p { color: var(--muted); line-height: 1.9; }
/* ---- responsive / mobile ---- */
img { max-width: 100%; }
input[type="text"], input[type="url"], textarea, select { font-size: 16px; }
.sort-tabs { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.sort-tabs::-webkit-scrollbar { display: none; }
.sort-tabs a { white-space: nowrap; flex: 0 0 auto; }
@media (max-width: 640px) {
  .header-inner { flex-wrap: wrap; padding: 8px 12px; row-gap: 6px; }
  .logo { font-size: 21px; }
  .header-nav { gap: 8px; flex-wrap: wrap; margin-left: 0; }
  .nav-user span { max-width: 110px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .hero { padding: 34px 6px 18px; }
  .hero p br { display: none; }
  .about-hero { padding: 32px 6px 6px; }
  .about-hero p br { display: none; }
  .grid { grid-template-columns: 1fr; gap: 14px; }
  .work-detail { padding: 18px 16px; margin-top: 16px; }
  .work-detail h1 { font-size: 22px; }
  .work-actions { flex-direction: column; align-items: stretch; }
  .work-actions .btn { text-align: center; }
  .work-actions .inline-form .btn { width: 100%; }
  .form-card { padding: 20px 16px; margin: 16px auto 40px; }
  .login-card { margin: 28px auto 44px; padding: 26px 18px; }
  .profile-head { gap: 12px; margin: 20px 0 4px; }
  .profile-head h1 { font-size: 21px; }
  .comment-form { align-items: stretch; }
  .modal-card { padding: 20px; }
  .feature-grid { grid-template-columns: 1fr; }
}