/* ぶいこみゅ v5 — Twitter-blue accent, Reddit-style layout */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
  --bg:       #DAE0E6;
  --surface:  #ffffff;
  --surface2: #f6f7f8;
  --border:   #edeff1;
  --border2:  #cfd3d8;
  --ink:      #1c1c1c;
  --ink2:     #576069;
  --ink3:     #878a8c;
  --a:        #1DA1F2;
  --a-h:      #1a8fd9;
  --a-lt:     #e8f5fd;
  --a-lt2:    #c8e6f9;
  --red:      #ea0027;
  --green:    #46d160;
  --green-dk: #1a7f37;
  --hh:       48px;
  --r:        4px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'DM Sans','Noto Sans JP',sans-serif;background:var(--bg);color:var(--ink);min-height:100vh;display:flex;flex-direction:column;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer}

/* HEADER */
.site-header{position:sticky;top:0;z-index:200;height:var(--hh);background:#fff;border-bottom:1px solid var(--border)}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;height:100%;display:flex;align-items:center;gap:16px}
.site-logo{display:flex;align-items:center;gap:8px;font-family:'DM Sans',sans-serif;font-weight:700;font-size:18px;color:var(--ink);flex-shrink:0;margin-right:8px}
.logo-icon{width:32px;height:32px;border-radius:6px;background:var(--a);display:flex;align-items:center;justify-content:center}
.header-search{flex:1;max-width:690px;position:relative}
.header-search svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--ink3);pointer-events:none}
.header-search input{width:100%;height:36px;padding:0 12px 0 34px;background:var(--surface2);border:1px solid var(--border);border-radius:20px;font-size:14px;color:var(--ink);outline:none;font-family:inherit;transition:all .15s}
.header-search input:focus{background:#fff;border-color:var(--a);box-shadow:0 0 0 2px var(--a-lt)}
.header-search input::placeholder{color:var(--ink3)}
.header-right{margin-left:auto;display:flex;align-items:center;gap:8px}
.notif-btn{position:relative;width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:#fff;display:flex;align-items:center;justify-content:center;transition:border-color .15s;color:var(--ink2);text-decoration:none}
.notif-btn:hover{border-color:var(--a);color:var(--a)}
.notif-badge{position:absolute;top:-3px;right:-3px;min-width:16px;height:16px;background:var(--red);color:#fff;font-size:10px;font-weight:700;border-radius:8px;padding:0 3px;display:flex;align-items:center;justify-content:center;border:2px solid #fff}
.user-chip{display:flex;align-items:center;gap:7px;padding:4px 12px 4px 5px;border:1px solid var(--border);border-radius:20px;background:#fff;font-size:13px;font-weight:600;transition:border-color .15s}
.user-chip:hover{border-color:var(--a)}
.user-avatar{width:26px;height:26px;border-radius:50%;object-fit:cover}
.user-avatar-ph{width:26px;height:26px;border-radius:50%;background:var(--a);color:#fff;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:20px;font-size:13px;font-weight:700;border:1px solid transparent;transition:all .15s;white-space:nowrap;cursor:pointer}
.btn-primary{background:var(--a);color:#fff;border-color:var(--a)}
.btn-primary:hover{background:var(--a-h);border-color:var(--a-h)}
.btn-secondary{background:#fff;color:var(--a);border-color:var(--a)}
.btn-secondary:hover{background:var(--a-lt)}
.btn-ghost{background:transparent;color:var(--ink2);border-color:var(--border2)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn-danger{background:#fff;color:var(--red);border-color:var(--red)}
.btn-danger:hover{background:#fff0f0}
.btn-sm{padding:4px 14px;font-size:12px}
.btn-icon{width:32px;height:32px;border-radius:50%;border:none;background:transparent;color:var(--ink3);display:flex;align-items:center;justify-content:center;transition:all .15s}
.btn-icon:hover{background:var(--surface2);color:var(--ink)}

/* LAYOUT */
.layout{max-width:1200px;margin:0 auto;padding:20px;display:flex;gap:24px}
.main-col{flex:1;min-width:0}
.side-col{width:312px;flex-shrink:0}
.main{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:20px}

/* FLASH */
.flash{padding:10px 14px;border-radius:var(--r);margin-bottom:14px;font-size:13px;font-weight:500;border:1px solid transparent}
.flash-success{background:#f0fff4;border-color:#86efac;color:var(--green-dk)}
.flash-error{background:#fff0f0;border-color:#fca5a5;color:var(--red)}
.flash-info{background:var(--a-lt);border-color:var(--a-lt2);color:var(--a)}

/* TAG BAR */
.tag-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.tag-chip{height:32px;padding:0 12px;border:1px solid var(--border2);border-radius:20px;background:#fff;color:var(--ink2);font-size:13px;font-weight:600;cursor:pointer;transition:all .13s;white-space:nowrap}
.tag-chip:hover{border-color:var(--a);color:var(--a);background:var(--a-lt)}
.tag-chip.active{background:var(--a);border-color:var(--a);color:#fff}

/* LIST HEADER */
.list-header{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:10px 12px;display:flex;align-items:center;gap:8px;margin-bottom:10px}
.sort-link{padding:7px 14px;border-radius:20px;font-size:13px;font-weight:700;color:var(--ink3);transition:all .13s}
.sort-link:hover{background:var(--surface2);color:var(--ink)}
.sort-link.active{background:var(--surface2);color:var(--ink)}
.list-header-right{margin-left:auto}

/* THREAD CARD */
.thread-list{display:flex;flex-direction:column;gap:10px}
.thread-card{display:flex;background:#fff;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:border-color .13s;position:relative}
.thread-card:hover{border-color:var(--ink)}
.thread-card.pinned{border-left:3px solid var(--a)}

.vote-col{width:40px;background:var(--surface2);display:flex;flex-direction:column;align-items:center;padding:10px 4px;gap:4px;flex-shrink:0}
.vote-up,.vote-dn{width:24px;height:24px;border-radius:2px;border:none;background:transparent;display:flex;align-items:center;justify-content:center;color:var(--ink3);cursor:pointer;transition:all .13s}
.vote-up:hover{color:var(--a);background:var(--a-lt)}
.vote-dn:hover{color:#9b4dca;background:#f3e8ff}
.vote-num{font-size:12px;font-weight:700;color:var(--ink2)}

.card-body{flex:1;min-width:0;padding:10px 12px}
.card-meta{display:flex;align-items:center;gap:6px;margin-bottom:5px;flex-wrap:wrap}
.sub-label{font-size:12px;font-weight:700;color:var(--ink2)}
.posted-by{font-size:12px;color:var(--ink3)}
.poster-name{font-weight:500;color:var(--ink2)}
.poster-name:hover{text-decoration:underline;color:var(--a)}
.card-title{font-size:18px;font-weight:500;color:var(--ink);margin-bottom:6px;line-height:1.3}
.thread-card:hover .card-title{color:var(--a)}
.card-excerpt{font-size:14px;color:var(--ink2);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-tags{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:8px}
.card-tag{font-size:12px;font-weight:500;padding:2px 8px;border-radius:2px;background:var(--a-lt);color:var(--a);border:1px solid var(--a-lt2)}
.card-footer{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.card-action{display:flex;align-items:center;gap:4px;padding:6px 8px;border-radius:2px;font-size:12px;font-weight:700;color:var(--ink3);transition:background .13s;cursor:pointer;border:none;background:transparent;font-family:inherit}
.card-action:hover{background:var(--surface2);color:var(--ink)}
.badge-pinned{font-size:11px;font-weight:700;color:var(--a);background:var(--a-lt);padding:1px 6px;border-radius:2px}
.badge-locked{font-size:11px;font-weight:700;color:var(--ink3);background:var(--surface2);padding:1px 6px;border-radius:2px}

.card-thumb{width:128px;flex-shrink:0;overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover}

/* THREAD DETAIL */
.thread-detail{background:#fff;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;margin-bottom:10px}
.thread-detail-vote{display:flex;flex-direction:column;align-items:center;width:40px;background:var(--surface2);padding:10px 4px;gap:4px;flex-shrink:0}
.thread-detail-inner{flex:1;padding:16px 20px}
.thread-detail-flex{display:flex}
.thread-detail-meta{display:flex;align-items:center;gap:6px;margin-bottom:8px;flex-wrap:wrap;font-size:12px;color:var(--ink3)}
.thread-detail-title{font-size:22px;font-weight:500;color:var(--ink);line-height:1.35;margin-bottom:10px}
.thread-detail-tags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.thread-detail-tag{font-size:12px;font-weight:500;padding:2px 9px;border-radius:2px;background:var(--a-lt);color:var(--a);border:1px solid var(--a-lt2);text-decoration:none}
.thread-detail-tag:hover{background:var(--a-lt2)}
.thread-img{max-width:540px;border-radius:var(--r);border:1px solid var(--border);margin-bottom:14px;cursor:pointer;transition:opacity .15s}
.thread-img:hover{opacity:.92}
.thread-body-text{font-size:15px;line-height:1.85;color:var(--ink);word-break:break-word}
.thread-actions{display:flex;align-items:center;gap:2px;padding:6px 0;border-top:1px solid var(--border);margin-top:14px;flex-wrap:wrap}

/* AUTHOR ROW */
.author-row{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.avatar-sm{width:28px;height:28px;border-radius:50%;object-fit:cover;flex-shrink:0}
.avatar-sm-ph{width:28px;height:28px;border-radius:50%;background:var(--a);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.author-name{font-size:13px;font-weight:600}
.author-name:hover{color:var(--a);text-decoration:underline}
.post-time{font-size:12px;color:var(--ink3)}

/* LIKE BTN */
.like-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 12px;border-radius:2px;border:none;background:transparent;color:var(--ink3);font-size:12px;font-weight:700;cursor:pointer;transition:all .13s;font-family:inherit}
.like-btn svg{width:14px;height:14px;flex-shrink:0}
.like-btn:hover{background:var(--surface2);color:var(--ink)}
.like-btn.liked{color:var(--a)}

/* ROLE BADGE */
.role-badge{font-size:11px;font-weight:700;padding:1px 6px;border-radius:2px;text-transform:uppercase;letter-spacing:.3px}
.role-admin{background:#fff8e1;color:#b7791f;border:1px solid #fde68a}
.role-mod{background:#f0fff4;color:var(--green-dk);border:1px solid #86efac}
.role-user{display:none}
.role-op{background:var(--a-lt);color:var(--a);border:1px solid var(--a-lt2)}

/* REPLY */
.reply-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--r)}
.replies-header{padding:12px 16px;border-bottom:1px solid var(--border);font-size:14px;font-weight:700;color:var(--ink)}
.reply-list{padding:0 16px}
.reply-card{display:flex;gap:10px;padding:12px 0;border-bottom:1px solid var(--border);animation:fadeUp .18s ease}
.reply-card:last-child{border-bottom:none}
@keyframes fadeUp{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.reply-no{font-size:11px;color:var(--ink3);font-weight:700;min-width:22px;text-align:right;padding-top:2px;flex-shrink:0}
.reply-body{flex:1;min-width:0}
.reply-header{display:flex;align-items:center;gap:6px;margin-bottom:4px;flex-wrap:wrap}
.reply-text{font-size:14px;line-height:1.75;color:var(--ink);word-break:break-word}
.reply-img{max-width:400px;border-radius:var(--r);border:1px solid var(--border);margin-top:8px;cursor:pointer;transition:opacity .13s}
.reply-img:hover{opacity:.9}
.reply-footer{display:flex;align-items:center;gap:4px;margin-top:6px}

/* MENTION DROPDOWN */
.mention-dropdown{position:absolute;left:0;top:calc(100% + 4px);background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:4px;min-width:210px;z-index:100;box-shadow:0 4px 20px rgba(0,0,0,.12);display:none}
.mention-dropdown.open{display:block}
.mention-item{display:flex;align-items:center;gap:8px;padding:7px 9px;border-radius:2px;cursor:pointer;font-size:12px;transition:background .1s}
.mention-item:hover,.mention-item.selected{background:var(--a-lt);color:var(--a)}

/* REPLY FORM */
.reply-form{padding:16px;border-top:1px solid var(--border);background:var(--surface2);border-radius:0 0 var(--r) var(--r)}

/* FORMS */
.form-page{max-width:740px}
.form-card{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:24px;max-width:740px}
.form-group{margin-bottom:18px}
.form-label{display:block;font-size:12px;font-weight:700;color:var(--ink2);margin-bottom:6px}
.form-input,.form-textarea,.form-select{width:100%;background:#fff;border:1px solid var(--border2);border-radius:var(--r);padding:9px 13px;color:var(--ink);font-size:14px;font-family:inherit;outline:none;transition:border-color .15s,box-shadow .15s}
.form-input::placeholder,.form-textarea::placeholder{color:var(--ink3)}
.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--a);box-shadow:0 0 0 2px var(--a-lt)}
.form-textarea{resize:vertical;min-height:110px;line-height:1.65}
.form-hint{font-size:11px;color:var(--ink3);margin-top:4px}
.form-error{font-size:12px;color:var(--red);margin-top:4px}

.tag-check-group{display:flex;flex-wrap:wrap;gap:7px}
.tag-check-label{padding:5px 12px;border-radius:20px;border:1px solid var(--border2);background:#fff;font-size:13px;font-weight:600;color:var(--ink3);cursor:pointer;transition:all .13s;user-select:none}
.tag-check-label:hover{border-color:var(--a);color:var(--a);background:var(--a-lt)}
.tag-check-label.checked{background:var(--a);border-color:var(--a);color:#fff}
.tag-check-label input{display:none}

.file-drop{border:1px dashed var(--border2);border-radius:var(--r);padding:24px;text-align:center;cursor:pointer;transition:all .15s;position:relative;background:var(--surface2)}
.file-drop:hover,.file-drop.drag{border-color:var(--a);background:var(--a-lt)}
.file-drop input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.file-drop-icon{display:flex;justify-content:center;color:var(--ink3);margin-bottom:6px}
.file-drop-text{font-size:13px;color:var(--ink3)}
.img-preview{position:relative;display:inline-block;margin-top:10px}
.img-preview img{max-width:210px;max-height:150px;border-radius:var(--r);border:1px solid var(--border);object-fit:cover}
.img-preview .remove-btn{position:absolute;top:-6px;right:-6px;width:20px;height:20px;border-radius:50%;border:none;background:var(--red);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center}

/* AUTH */
.auth-wrap{display:flex;justify-content:center;align-items:center;min-height:calc(100vh - var(--hh));padding:40px 20px;background:var(--bg)}
.auth-card{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:32px;width:100%;max-width:400px}
.auth-title{font-size:20px;font-weight:700;margin-bottom:22px}
.auth-footer{text-align:center;margin-top:16px;font-size:13px;color:var(--ink3)}
.auth-footer a{color:var(--a);font-weight:600}
.auth-footer a:hover{text-decoration:underline}

/* PAGE TITLE */
.page-title{font-size:18px;font-weight:700;margin-bottom:18px}

/* LOADING */
.load-sentinel{display:flex;justify-content:center;align-items:center;padding:24px;gap:8px;color:var(--ink3);font-size:13px}
.spinner{width:18px;height:18px;border-radius:50%;border:2px solid var(--border);border-top-color:var(--a);animation:spin .55s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* INLINE TEXT */
.mention{color:var(--a);font-weight:600}
.mention:hover{text-decoration:underline;cursor:pointer}
.hashtag{color:var(--ink3);font-weight:500}
.reply-text a,.thread-body-text a{color:var(--a)}
.reply-text a:hover,.thread-body-text a:hover{text-decoration:underline}

/* NOTIFICATIONS */
.notif-list{display:flex;flex-direction:column;gap:2px}
.notif-item{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;background:#fff;border:1px solid var(--border);border-radius:var(--r);transition:border-color .13s}
.notif-item:hover{border-color:var(--a)}
.notif-item.unread{border-left:3px solid var(--a);background:var(--a-lt)}
.notif-icon{color:var(--ink3);flex-shrink:0;margin-top:2px}
.notif-text{font-size:13px;color:var(--ink);flex:1;line-height:1.5}
.notif-sub{font-size:12px;color:var(--a);margin-top:2px;font-weight:500}
.notif-time{font-size:11px;color:var(--ink3);margin-top:3px}

/* LIGHTBOX */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:500;display:none;align-items:center;justify-content:center;cursor:pointer}
.lightbox.open{display:flex}
.lightbox img{max-width:90vw;max-height:90vh;border-radius:var(--r);cursor:default}

/* LOCKED */
.locked-notice{text-align:center;padding:18px 16px;background:var(--surface2);color:var(--ink3);font-size:13px;border-top:1px solid var(--border);border-radius:0 0 var(--r) var(--r);display:flex;align-items:center;justify-content:center;gap:6px}

/* EMPTY */
.empty-state{text-align:center;padding:56px 20px;color:var(--ink3)}
.empty-state svg{margin:0 auto 12px;opacity:.25}
.empty-state p{font-size:14px}

/* FOOTER */
.site-footer{text-align:center;padding:16px;font-size:12px;color:var(--ink3);border-top:1px solid var(--border);background:#fff}

/* RESPONSIVE */
@media(max-width:960px){.side-col{display:none}}
@media(max-width:768px){
  .header-nav{display:none}
  .header-search{display:none}
  .card-thumb{display:none}
  .thread-detail-flex{flex-direction:column}
  .thread-detail-vote{flex-direction:row;width:auto;padding:8px 16px}
  .thread-detail-inner{padding:14px}
  .reply-list{padding:0 12px}
  .reply-form{padding:12px}
  .form-card{padding:16px}
  .auth-card{padding:24px}
  .main{padding:12px}
  .layout{padding:12px;gap:0}
}
@media(max-width:480px){
  .user-chip span{display:none}
  .user-chip{padding:5px;border-radius:50%}
}