/* ═══════════════════════════════════════════════════════
   X.CSS — FlowVid X (style Twitter/X en dark mode)
═══════════════════════════════════════════════════════ */

:root {
    --x-bg: #000;
    --x-bg-card: #16181c;
    --x-bg-hover: #1d1f23;
    --x-border: #2f2f2f;
    --x-text: #e7e9ea;
    --x-muted: #71767b;
    --x-blue: #1d9bf0;
    --x-blue-hover: #1a8cd8;
    --x-red: #f91880;
    --x-green: #00ba7c;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--x-text);
    background: var(--x-bg);
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--x-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.x-layout {
    display: grid;
    grid-template-columns: 275px minmax(0, 600px) 290px;
    gap: 0;
    max-width: 1265px;
    margin: 0 auto;
    min-height: calc(100vh - 60px);
}
.x-left { position: sticky; top: 60px; height: calc(100vh - 60px); padding: 8px 12px; display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
.x-center { border-left: 1px solid var(--x-border); border-right: 1px solid var(--x-border); min-height: 100vh; }
.x-right { padding: 8px 16px; position: sticky; top: 60px; height: calc(100vh - 60px); overflow-y: auto; }

.x-icon-btn { width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; background: transparent; color: var(--x-text); border: none; border-radius: 50%; cursor: pointer; transition: 0.15s; font-size: 1.05rem; }
.x-icon-btn:hover { background: rgba(231,233,234,0.1); }
.x-icon-btn:disabled { opacity: 0.4; cursor: default; }

.x-post-btn { background: var(--x-text); color: #0f1419; border: none; border-radius: 9999px; padding: 10px 20px; font-weight: 700; font-size: 0.95rem; cursor: pointer; transition: 0.15s; }
.x-post-btn:hover:not(:disabled) { background: #d7d9da; }
.x-post-btn:disabled { opacity: 0.55; cursor: default; }
.x-post-btn.primary { background: var(--x-blue); color: #fff; }
.x-post-btn.primary:hover:not(:disabled) { background: var(--x-blue-hover); }

.x-nav-item { display: flex; align-items: center; gap: 18px; background: transparent; color: var(--x-text); border: none; border-radius: 9999px; padding: 12px 16px; font-size: 1.2rem; font-weight: 400; cursor: pointer; text-align: left; transition: 0.15s; position: relative; }
.x-nav-item:hover { background: rgba(231,233,234,0.1); }
.x-nav-item.active { font-weight: 700; }
.x-nav-item i { font-size: 1.5rem; width: 26px; text-align: center; }
.x-nav-badge { position: absolute; top: 6px; right: 6px; background: var(--x-blue); color: #fff; font-size: 0.7rem; font-weight: 700; padding: 1px 6px; border-radius: 9999px; min-width: 18px; text-align: center; }

.x-compose-btn { background: var(--x-blue); color: #fff; border: none; border-radius: 9999px; padding: 14px 32px; margin-top: 16px; font-size: 1.05rem; font-weight: 700; cursor: pointer; transition: 0.15s; display: flex; align-items: center; gap: 10px; justify-content: center; width: 90%; }
.x-compose-btn:hover { background: var(--x-blue-hover); }
.x-compose-btn-icon { display: none; background: var(--x-blue); color: #fff; border: none; border-radius: 50%; width: 56px; height: 56px; font-size: 1.4rem; margin: 12px auto; cursor: pointer; box-shadow: 0 4px 12px rgba(29,155,240,0.4); }
.x-compose-btn-icon:hover { background: var(--x-blue-hover); }

.x-feed-header { position: sticky; top: 60px; z-index: 20; background: rgba(0,0,0,0.85); backdrop-filter: blur(12px); }
.x-feed-tabs { display: flex; }
.x-feed-tab { flex: 1; padding: 16px 0; background: transparent; color: var(--x-muted); border: none; font-weight: 500; font-size: 0.95rem; cursor: pointer; position: relative; transition: 0.15s; }
.x-feed-tab:hover { background: rgba(231,233,234,0.05); }
.x-feed-tab.active { color: var(--x-text); font-weight: 700; }
.x-feed-tab.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 56px; height: 4px; background: var(--x-blue); border-radius: 9999px; }

.x-composer { display: flex; gap: 12px; padding: 16px; border-bottom: 1px solid var(--x-border); }
.x-avatar { width: 40px; height: 40px; border-radius: 50%; background: #333; display: flex; align-items: center; justify-content: center; color: var(--x-text); overflow: hidden; flex-shrink: 0; }
.x-avatar img { width: 100%; height: 100%; object-fit: cover; }
.x-avatar.sm { width: 32px; height: 32px; }
.x-avatar.lg { width: 134px; height: 134px; border: 4px solid #000; }
.x-avatar i { font-size: 1.1rem; }

.x-composer-right { flex: 1; min-width: 0; }
.x-composer-textarea { width: 100%; min-height: 56px; background: transparent; color: var(--x-text); border: none; outline: none; resize: none; font-size: 1.2rem; font-family: inherit; padding: 12px 0; }
.x-composer-textarea::placeholder { color: var(--x-muted); }

.x-composer-media-preview { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.x-media-thumb { position: relative; border-radius: 16px; overflow: hidden; border: 1px solid var(--x-border); }
.x-media-thumb img, .x-media-thumb video { display: block; }
.x-media-remove { position: absolute; top: 6px; left: 6px; width: 28px; height: 28px; background: rgba(0,0,0,0.75); color: #fff; border: none; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 0.8rem; }

.x-composer-divider { height: 1px; background: var(--x-border); margin: 12px 0; }
.x-composer-actions { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.x-composer-icons { display: flex; gap: 4px; }
.x-char-count { color: var(--x-muted); font-size: 0.85rem; }
.x-char-count.warn { color: #fbbf24; }
.x-char-count.over { color: var(--x-red); }

.x-input, .x-textarea { width: 100%; background: transparent; color: var(--x-text); border: 1px solid var(--x-border); border-radius: 6px; padding: 12px; font-size: 0.95rem; font-family: inherit; outline: none; transition: 0.15s; }
.x-input:focus, .x-textarea:focus { border-color: var(--x-blue); }
.x-textarea { resize: vertical; min-height: 80px; }

.x-post { display: flex; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--x-border); cursor: pointer; transition: 0.13s; }
.x-post:hover { background: rgba(255,255,255,0.03); }
.x-post.pinned { background: rgba(29,155,240,0.04); }
.x-post-right { flex: 1; min-width: 0; }
.x-post-header { display: flex; align-items: center; gap: 4px; font-size: 0.95rem; flex-wrap: wrap; margin-bottom: 2px; }
.x-post-name { font-weight: 700; color: var(--x-text); }
.x-post-name:hover { text-decoration: underline; }
.x-verified-badge { color: var(--x-blue); font-size: 0.9rem; }
.x-post-handle, .x-post-time, .x-post-dot { color: var(--x-muted); }
.x-post-options-btn { margin-left: auto; width: 30px; height: 30px; background: transparent; border: none; color: var(--x-muted); border-radius: 50%; cursor: pointer; }
.x-post-options-btn:hover { background: rgba(29,155,240,0.1); color: var(--x-blue); }

.x-repost-label { display: flex; align-items: center; gap: 6px; color: var(--x-muted); font-size: 0.85rem; margin-left: 52px; margin-bottom: 4px; }
.x-post-body { font-size: 0.95rem; line-height: 1.45; color: var(--x-text); white-space: pre-wrap; word-wrap: break-word; margin: 4px 0; }
.x-post-hashtag, .x-post-mention { color: var(--x-blue); cursor: pointer; }
.x-post-hashtag:hover, .x-post-mention:hover { text-decoration: underline; }

.x-post-media { display: grid; gap: 4px; margin: 8px 0; border-radius: 16px; overflow: hidden; border: 1px solid var(--x-border); }
.x-post-media.media-1 { grid-template-columns: 1fr; }
.x-post-media.media-2 { grid-template-columns: 1fr 1fr; }
.x-post-media.media-3 { grid-template-columns: 2fr 1fr; grid-template-rows: 1fr 1fr; }
.x-post-media.media-3 .x-media-item:first-child { grid-row: span 2; }
.x-post-media.media-4 { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.x-media-item { position: relative; aspect-ratio: 16/9; background: #000; cursor: pointer; overflow: hidden; }
.x-media-item img, .x-media-item video { width: 100%; height: 100%; object-fit: cover; display: block; }
.x-media-video-icon { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); width: 42px; height: 42px; background: rgba(0,0,0,0.65); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.95rem; }

.x-quoted-post { margin-top: 8px; padding: 12px; border: 1px solid var(--x-border); border-radius: 16px; cursor: pointer; transition: 0.13s; }
.x-quoted-post:hover { background: rgba(255,255,255,0.03); }

.x-post-actions { display: flex; justify-content: space-between; margin-top: 8px; max-width: 425px; }
.x-action-btn { display: flex; align-items: center; gap: 6px; background: transparent; border: none; color: var(--x-muted); font-size: 0.85rem; padding: 4px 8px; border-radius: 9999px; cursor: pointer; transition: 0.13s; font-family: inherit; }
.x-action-btn:hover { color: var(--x-blue); background: rgba(29,155,240,0.1); }
.x-action-btn.like:hover { color: var(--x-red); background: rgba(249,24,128,0.1); }
.x-action-btn.like.active { color: var(--x-red); }
.x-action-btn.repost:hover { color: var(--x-green); background: rgba(0,186,124,0.1); }
.x-action-btn.repost.active { color: var(--x-green); }
.x-action-btn.bookmark:hover { color: var(--x-blue); background: rgba(29,155,240,0.1); }
.x-action-btn.bookmark.active { color: var(--x-blue); }
.x-action-btn.share:hover { color: var(--x-blue); background: rgba(29,155,240,0.1); }
.x-action-btn i { font-size: 1.05rem; }

.x-back-btn { position: sticky; top: 60px; z-index: 30; display: flex; align-items: center; gap: 22px; padding: 8px 16px; background: rgba(0,0,0,0.85); backdrop-filter: blur(12px); color: var(--x-text); border: none; font-size: 1.2rem; cursor: pointer; width: 100%; border-bottom: 1px solid var(--x-border); }
.x-back-btn i { font-size: 1.1rem; }
.x-post-detail { padding: 16px; border-bottom: 1px solid var(--x-border); }
.x-post-detail-header { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.x-post-detail-body { font-size: 1.25rem; line-height: 1.4; margin: 12px 0; white-space: pre-wrap; }
.x-post-detail-meta { color: var(--x-muted); font-size: 0.9rem; padding: 12px 0; border-bottom: 1px solid var(--x-border); }
.x-post-detail-actions { display: flex; justify-content: space-around; padding: 12px 0; border-bottom: 1px solid var(--x-border); }
.x-post-detail-actions .x-action-btn { padding: 8px 12px; }

.x-search-box { display: flex; align-items: center; gap: 10px; background: var(--x-bg-card); border-radius: 9999px; padding: 12px 16px; margin-bottom: 16px; border: 1px solid var(--x-border); }
.x-search-box i { color: var(--x-muted); }
.x-search-box input { flex: 1; background: transparent; border: none; outline: none; color: var(--x-text); font-size: 0.95rem; font-family: inherit; }
.x-search-tabs { display: flex; border-bottom: 1px solid var(--x-border); }
.x-search-tabs .x-feed-tab { font-size: 0.9rem; padding: 14px 0; }

.x-widget { background: var(--x-bg-card); border-radius: 16px; padding: 4px 0; margin-bottom: 16px; }
.x-widget-title { padding: 14px 18px 4px; font-size: 1.2rem; font-weight: 800; }
.x-trend-item { padding: 12px 18px; cursor: pointer; transition: 0.13s; }
.x-trend-item:hover { background: var(--x-bg-hover); }
.x-trend-cat { color: var(--x-muted); font-size: 0.8rem; }
.x-trend-tag { color: var(--x-text); font-weight: 700; font-size: 0.95rem; margin: 2px 0; }
.x-trend-count { color: var(--x-muted); font-size: 0.8rem; }

.x-who-item { display: flex; align-items: center; gap: 12px; padding: 12px 18px; cursor: pointer; transition: 0.13s; }
.x-who-item:hover { background: var(--x-bg-hover); }
.x-who-info { flex: 1; min-width: 0; }
.x-who-name { font-weight: 700; color: var(--x-text); }
.x-who-name:hover { text-decoration: underline; }
.x-who-handle { color: var(--x-muted); font-size: 0.85rem; }
.x-follow-btn { background: var(--x-text); color: #0f1419; border: none; border-radius: 9999px; padding: 6px 16px; font-weight: 700; font-size: 0.85rem; cursor: pointer; transition: 0.15s; }
.x-follow-btn:hover { background: #d7d9da; }
.x-follow-btn.following { background: transparent; color: var(--x-text); border: 1px solid var(--x-border); }
.x-follow-btn.following:hover { background: rgba(249,24,128,0.1); color: var(--x-red); border-color: rgba(249,24,128,0.4); }

.x-dm-layout { display: flex; height: calc(100vh - 60px); }
.x-dm-sidebar { width: 320px; border-right: 1px solid var(--x-border); display: flex; flex-direction: column; }
.x-dm-sidebar-header { padding: 16px; font-size: 1.25rem; font-weight: 800; display: flex; justify-content: space-between; align-items: center; }
.x-dm-input { width: 100%; background: var(--x-bg-card); border: 1px solid var(--x-border); border-radius: 9999px; padding: 8px 14px; color: var(--x-text); outline: none; font-family: inherit; }
.x-dm-list { flex: 1; overflow-y: auto; }
.x-dm-conv-item { display: flex; gap: 12px; padding: 12px 16px; cursor: pointer; border-bottom: 1px solid var(--x-border); transition: 0.13s; }
.x-dm-conv-item:hover { background: rgba(255,255,255,0.03); }
.x-dm-conv-item.active { background: rgba(29,155,240,0.08); }
.x-dm-conv-info { flex: 1; min-width: 0; }
.x-dm-conv-name { font-weight: 700; }
.x-dm-conv-preview { color: var(--x-muted); font-size: 0.85rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.x-dm-conv-time { color: var(--x-muted); font-size: 0.78rem; }
.x-dm-unread-dot { width: 8px; height: 8px; background: var(--x-blue); border-radius: 50%; }

.x-dm-chat { flex: 1; display: flex; flex-direction: column; }
.x-dm-chat-header { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--x-border); }
.x-dm-messages { flex: 1; padding: 16px; overflow-y: auto; display: flex; flex-direction: column; gap: 6px; }
.x-dm-message { display: flex; flex-direction: column; max-width: 70%; }
.x-dm-message.mine { align-self: flex-end; }
.x-dm-message-bubble { background: var(--x-bg-card); padding: 10px 14px; border-radius: 18px; font-size: 0.95rem; }
.x-dm-message.mine .x-dm-message-bubble { background: var(--x-blue); color: #fff; }
.x-dm-message-meta { font-size: 0.72rem; color: var(--x-muted); margin-top: 2px; padding: 0 8px; display: flex; gap: 4px; }
.x-dm-seen { color: var(--x-blue); }
.x-dm-footer { display: flex; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--x-border); align-items: center; }
.x-dm-footer .x-dm-input { border-radius: 9999px; }
.x-dm-send-btn { width: 36px; height: 36px; border-radius: 50%; background: var(--x-blue); color: #fff; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; }

.x-profile-banner { height: 200px; background: #333; }
.x-profile-banner img { width: 100%; height: 100%; object-fit: cover; }
.x-profile-header { padding: 0 16px 16px; border-bottom: 1px solid var(--x-border); position: relative; }
.x-profile-avatar-wrap { margin-top: -67px; }
.x-profile-avatar-wrap .x-avatar { border: 4px solid #000; }
.x-profile-info { padding-top: 12px; }
.x-profile-name { font-size: 1.3rem; font-weight: 800; }
.x-profile-handle { color: var(--x-muted); margin-bottom: 12px; }
.x-profile-bio { margin: 8px 0; white-space: pre-wrap; }
.x-profile-meta { display: flex; flex-wrap: wrap; gap: 14px; color: var(--x-muted); font-size: 0.88rem; margin: 8px 0; }
.x-profile-meta i { margin-right: 4px; }
.x-profile-stats { display: flex; gap: 18px; margin-top: 8px; }
.x-profile-edit-btn { background: transparent; color: var(--x-text); border: 1px solid var(--x-border); border-radius: 9999px; padding: 8px 16px; font-weight: 700; cursor: pointer; }
.x-profile-edit-btn:hover { background: rgba(231,233,234,0.1); }
.x-profile-tabs { display: flex; margin-top: 16px; margin-left: -16px; margin-right: -16px; }
.x-profile-tab { flex: 1; padding: 14px 0; background: transparent; color: var(--x-muted); border: none; font-weight: 500; cursor: pointer; transition: 0.15s; position: relative; }
.x-profile-tab:hover { background: rgba(231,233,234,0.05); }
.x-profile-tab.active { color: var(--x-text); font-weight: 700; }
.x-profile-tab.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 56px; height: 4px; background: var(--x-blue); border-radius: 9999px; }

.x-notif-item { display: flex; gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--x-border); cursor: pointer; transition: 0.13s; }
.x-notif-item:hover { background: rgba(255,255,255,0.03); }
.x-notif-item.unread { background: rgba(29,155,240,0.05); }
.x-notif-icon { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; flex-shrink: 0; color: #fff; font-size: 1.1rem; }
.x-notif-icon.like { background: rgba(249,24,128,0.15); color: var(--x-red); }
.x-notif-icon.repost { background: rgba(0,186,124,0.15); color: var(--x-green); }
.x-notif-icon.follow { background: rgba(29,155,240,0.15); color: var(--x-blue); }
.x-notif-icon.mention, .x-notif-icon.reply, .x-notif-icon.dm { background: rgba(29,155,240,0.15); color: var(--x-blue); }
.x-notif-text { font-size: 0.92rem; line-height: 1.4; }
.x-notif-time { color: var(--x-muted); font-size: 0.8rem; margin-top: 4px; }

.x-modal-overlay { position: fixed; inset: 0; z-index: 3000; background: rgba(91,112,131,0.4); display: none; align-items: flex-start; justify-content: center; padding-top: 5vh; }
.x-modal-overlay.open { display: flex; }
.x-modal { background: #000; border-radius: 16px; width: 90%; max-width: 600px; min-height: 200px; border: 1px solid var(--x-border); overflow: hidden; max-height: 90vh; overflow-y: auto; }
.x-modal-header { display: flex; align-items: center; gap: 14px; padding: 8px 12px; position: sticky; top: 0; background: #000; z-index: 2; }
.x-modal-close { width: 34px; height: 34px; border-radius: 50%; background: transparent; border: none; color: var(--x-text); cursor: pointer; }
.x-modal-close:hover { background: rgba(231,233,234,0.1); }

.x-context-menu { position: fixed; z-index: 5000; min-width: 200px; background: #1d1f23; border: 1px solid var(--x-border); border-radius: 12px; padding: 6px 0; box-shadow: 0 8px 24px rgba(0,0,0,0.6); display: none; }
.x-context-menu.open { display: block; }
.x-ctx-item { display: flex; align-items: center; gap: 12px; padding: 10px 16px; color: var(--x-text); cursor: pointer; font-size: 0.9rem; }
.x-ctx-item:hover { background: rgba(231,233,234,0.08); }
.x-ctx-item.danger { color: var(--x-red); }

.x-empty { text-align: center; padding: 60px 20px; color: var(--x-muted); }
.x-empty h3 { color: var(--x-text); margin-bottom: 8px; }
.x-spinner { width: 32px; height: 32px; border: 3px solid rgba(255,255,255,0.1); border-top-color: var(--x-blue); border-radius: 50%; animation: xSpin 0.8s linear infinite; margin: 30px auto; }
@keyframes xSpin { to { transform: rotate(360deg); } }

.x-toast-container { position: fixed; top: 80px; left: 50%; transform: translateX(-50%); z-index: 9000; display: flex; flex-direction: column; gap: 8px; }
.x-toast { background: var(--x-blue); color: #fff; padding: 12px 20px; border-radius: 8px; font-size: 0.9rem; font-weight: 600; box-shadow: 0 4px 12px rgba(0,0,0,0.3); animation: xToastIn 0.25s ease-out; }
@keyframes xToastIn { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 1100px) {
    .x-layout { grid-template-columns: 88px minmax(0, 600px); }
    .x-right { display: none; }
    .x-nav-item span { display: none; }
    .x-nav-item { justify-content: center; padding: 12px; }
    .x-compose-btn { display: none; }
    .x-compose-btn-icon { display: block; }
}
@media (max-width: 700px) {
    .x-layout { grid-template-columns: minmax(0, 1fr); }
    .x-left { display: none; }
    .x-center { border-left: none; border-right: none; }
}