/* TubeStack Community — Mobile-First CSS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --ts-green:    #1a5c38;
  --ts-green-dk: #14472c;
  --ts-green-lt: #e8f5ee;
  --ts-purple:   #7c3aed;
  --ts-white:    #ffffff;
  --ts-bg:       #f4f6f4;
  --ts-border:   #d8e8de;
  --ts-text:     #1a1a1a;
  --ts-muted:    #6b7280;
  --ts-radius:   10px;
  --ts-shadow:   0 2px 8px rgba(0,0,0,.08);
  --nav-h:       56px;
  --tab-h:       58px;
}

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

body.tsc-page {
  font-family: 'Inter', sans-serif;
  background: var(--ts-bg);
  color: var(--ts-text);
  font-size: 15px;
  line-height: 1.55;
}

/* ── Top Nav ─────────────────────────────────────────────────────────── */
.tsc-top-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  background: var(--ts-green);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.tsc-nav-logo { color: #fff; font-weight: 700; font-size: 17px; text-decoration: none; }
.tsc-nav-logo span { color: #a3d9b5; }
.tsc-nav-links { display: none; gap: 4px; }
.tsc-nav-links a {
  color: rgba(255,255,255,.85); text-decoration: none;
  padding: 6px 12px; border-radius: 6px; font-size: 14px; font-weight: 500;
  transition: background .15s;
}
.tsc-nav-links a:hover,
.tsc-nav-links a.active { background: rgba(255,255,255,.15); color: #fff; }
.tsc-nav-right { display: flex; align-items: center; gap: 8px; }
.tsc-nav-avatar img { width: 32px; height: 32px; border-radius: 50%; border: 2px solid rgba(255,255,255,.4); }
.tsc-nav-login { color: #fff; text-decoration: none; font-size: 14px; font-weight: 500;
  padding: 6px 14px; background: rgba(255,255,255,.15); border-radius: 6px; }
.tsc-burger { background: none; border: none; cursor: pointer; color: #fff; display: flex; align-items: center; }

/* Mobile drawer */
.tsc-drawer {
  position: fixed; top: var(--nav-h); left: 0; right: 0; bottom: 0; z-index: 999;
  background: var(--ts-green-dk); display: none; flex-direction: column; padding: 12px 0;
}
.tsc-drawer.open { display: flex; }
.tsc-drawer a {
  color: rgba(255,255,255,.9); text-decoration: none; padding: 14px 24px;
  font-size: 16px; font-weight: 500; border-bottom: 1px solid rgba(255,255,255,.08);
}
.tsc-drawer a.active,
.tsc-drawer a:hover { background: rgba(255,255,255,.1); color: #fff; }

/* ── Page body ───────────────────────────────────────────────────────── */
.tsc-page-body {
  margin-top: var(--nav-h);
  padding: 16px 12px calc(var(--tab-h) + 16px);
  min-height: calc(100vh - var(--nav-h));
}

/* ── Bottom tab bar ──────────────────────────────────────────────────── */
.tsc-bottom-tabs {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000;
  height: var(--tab-h);
  background: var(--ts-white);
  border-top: 1px solid var(--ts-border);
  display: flex;
}
.tsc-tab-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 3px; text-decoration: none;
  font-size: 10px; font-weight: 500; color: var(--ts-muted);
  transition: color .15s; padding: 0;
  background: none; border: none; cursor: pointer;
}
.tsc-tab-btn .tsc-tab-icon { font-size: 20px; line-height: 1; }
.tsc-tab-btn.active { color: var(--ts-green); }
.tsc-tab-btn:hover  { color: var(--ts-green); }

/* ── Card ────────────────────────────────────────────────────────────── */
.tsc-card {
  background: var(--ts-white); border-radius: var(--ts-radius);
  box-shadow: var(--ts-shadow); padding: 16px;
}

/* ── Section head ────────────────────────────────────────────────────── */
.tsc-section-head { margin-bottom: 16px; }
.tsc-section-head h2 { font-size: 20px; font-weight: 700; color: var(--ts-green); }
.tsc-section-head p  { font-size: 14px; color: var(--ts-muted); margin-top: 2px; }

/* ── Buttons ─────────────────────────────────────────────────────────── */
.tsc-btn-green {
  background: var(--ts-green); color: #fff; border: none;
  padding: 10px 20px; border-radius: 8px; font-size: 14px; font-weight: 600;
  cursor: pointer; text-decoration: none; display: inline-block; transition: background .15s;
}
.tsc-btn-green:hover { background: var(--ts-green-dk); color: #fff; }
.tsc-btn-green.tsc-btn-sm { padding: 7px 14px; font-size: 13px; }
.tsc-btn-outline {
  background: transparent; color: var(--ts-green);
  border: 2px solid var(--ts-green); padding: 8px 20px; border-radius: 8px;
  font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none;
  display: inline-block; transition: all .15s;
}
.tsc-btn-outline:hover { background: var(--ts-green-lt); }
.tsc-btn-outline.tsc-btn-sm { padding: 6px 14px; font-size: 13px; }

/* ── Login gate ──────────────────────────────────────────────────────── */
.tsc-login-gate {
  text-align: center; padding: 48px 20px;
  background: var(--ts-white); border-radius: var(--ts-radius);
}
.tsc-login-gate p { color: var(--ts-muted); margin-bottom: 16px; }
.tsc-login-gate a  { color: var(--ts-green); }

/* ── Inline msg ──────────────────────────────────────────────────────── */
.tsc-inline-msg { font-size: 13px; margin-top: 6px; color: var(--ts-green); min-height: 18px; }
.tsc-inline-msg.err { color: #dc2626; }

/* ── Empty state ─────────────────────────────────────────────────────── */
.tsc-empty-state { text-align: center; padding: 40px 20px; }
.tsc-empty-state span { font-size: 36px; display: block; margin-bottom: 12px; }
.tsc-empty-state p { color: var(--ts-muted); }

/* ─────────────────────────────────────────────────────────────────────
   CHAT
───────────────────────────────────────────────────────────────────── */
.tsc-chat-wrap {
  display: flex; flex-direction: column;
  height: calc(100vh - var(--nav-h) - var(--tab-h));
  gap: 0;
}

/* Groups list */
.tsc-groups-list {
  background: var(--ts-white); border-radius: var(--ts-radius);
  box-shadow: var(--ts-shadow); overflow: hidden; flex-shrink: 0;
}
.tsc-groups-header {
  padding: 12px 14px; background: var(--ts-green); display: flex;
  align-items: center; gap: 10px;
}
.tsc-groups-header span { color: #fff; font-weight: 600; font-size: 15px; }
#tscGroupSearch {
  flex: 1; border: none; border-radius: 6px; padding: 6px 10px;
  font-size: 13px; outline: none;
}
.tsc-groups-items { max-height: 220px; overflow-y: auto; }

.tsc-group-item {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px;
  cursor: pointer; border-bottom: 1px solid #f0f0f0; transition: background .1s;
}
.tsc-group-item:hover,
.tsc-group-item.active { background: var(--ts-green-lt); }
.tsc-group-icon  { font-size: 22px; flex-shrink: 0; }
.tsc-group-info  { flex: 1; min-width: 0; }
.tsc-group-name  { font-weight: 600; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tsc-group-preview { font-size: 12px; color: var(--ts-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 2px; }
.tsc-online-dot  { width: 8px; height: 8px; border-radius: 50%; background: #d1d5db; flex-shrink: 0; }
.tsc-online-dot.online { background: #22c55e; }

/* Chat panel */
.tsc-chat-panel  { flex: 1; display: flex; flex-direction: column; min-height: 0; margin-top: 10px; }
.tsc-chat-placeholder {
  flex: 1; display: flex; align-items: center; justify-content: center;
  background: var(--ts-white); border-radius: var(--ts-radius);
}
.tsc-placeholder-inner { text-align: center; color: var(--ts-muted); }
.tsc-placeholder-inner span { font-size: 40px; display: block; margin-bottom: 8px; }

.tsc-chat-active { flex: 1; display: flex; flex-direction: column; min-height: 0;
  background: var(--ts-white); border-radius: var(--ts-radius); box-shadow: var(--ts-shadow); overflow: hidden; }
.tsc-chat-header {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px;
  background: var(--ts-green); flex-shrink: 0;
}
.tsc-back-btn    { background: none; border: none; color: #fff; font-size: 20px; cursor: pointer; padding: 0 4px; }
.tsc-chat-header-icon { font-size: 22px; }
.tsc-chat-header-name  { color: #fff; font-weight: 600; font-size: 15px; }
.tsc-chat-header-online{ color: rgba(255,255,255,.75); font-size: 12px; }

.tsc-messages-wrap { flex: 1; overflow-y: auto; padding: 14px 12px; display: flex; flex-direction: column; gap: 10px; }

/* Message bubbles */
.tsc-msg { display: flex; gap: 8px; max-width: 88%; }
.tsc-msg.mine { align-self: flex-end; flex-direction: row-reverse; }
.tsc-msg img  { width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0; align-self: flex-end; }
.tsc-bubble   {
  padding: 8px 12px; border-radius: 14px; font-size: 14px; line-height: 1.45;
  background: #f0f0f0; word-break: break-word;
}
.tsc-msg.mine .tsc-bubble { background: var(--ts-green); color: #fff; border-bottom-right-radius: 4px; }
.tsc-msg:not(.mine) .tsc-bubble { border-bottom-left-radius: 4px; }
.tsc-msg-meta { font-size: 11px; color: var(--ts-muted); margin-top: 3px; }
.tsc-msg-sender { font-size: 11px; font-weight: 600; color: var(--ts-green); margin-bottom: 2px; }
.tsc-msg.mine .tsc-msg-sender { color: rgba(255,255,255,.7); }

.tsc-input-bar {
  display: flex; align-items: flex-end; gap: 8px; padding: 10px 12px;
  border-top: 1px solid var(--ts-border); flex-shrink: 0; background: #fff;
}
#tscMsgInput {
  flex: 1; border: 1px solid var(--ts-border); border-radius: 20px;
  padding: 9px 14px; font-size: 14px; resize: none; outline: none;
  font-family: inherit; max-height: 100px; overflow-y: auto;
  transition: border-color .15s;
}
#tscMsgInput:focus { border-color: var(--ts-green); }
.tsc-send-btn {
  background: var(--ts-green); color: #fff; border: none;
  width: 38px; height: 38px; border-radius: 50%; cursor: pointer;
  font-size: 16px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background .15s;
}
.tsc-send-btn:hover { background: var(--ts-green-dk); }

/* ─────────────────────────────────────────────────────────────────────
   FEED
───────────────────────────────────────────────────────────────────── */
.tsc-feed-wrap { display: flex; flex-direction: column; gap: 14px; }

.tsc-create-post .tsc-post-avatar-row { display: flex; gap: 10px; align-items: flex-start; }
.tsc-create-post .tsc-post-avatar-row img { width: 40px; height: 40px; border-radius: 50%; flex-shrink: 0; }
#tscPostContent {
  flex: 1; border: 1px solid var(--ts-border); border-radius: 10px;
  padding: 10px 14px; font-size: 14px; font-family: inherit; resize: vertical;
  min-height: 80px; outline: none; transition: border-color .15s;
}
#tscPostContent:focus { border-color: var(--ts-green); }
.tsc-create-post-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; }
.tsc-char-count { font-size: 12px; color: var(--ts-muted); }

/* Post card */
.tsc-post-card { margin-bottom: 0; }
.tsc-post-header { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.tsc-post-header img { width: 40px; height: 40px; border-radius: 50%; }
.tsc-post-author { font-weight: 600; font-size: 14px; }
.tsc-post-time   { font-size: 12px; color: var(--ts-muted); }
.tsc-post-title  { font-weight: 700; font-size: 16px; margin-bottom: 6px; }
.tsc-post-content { font-size: 14px; line-height: 1.55; color: #333; }
.tsc-post-image  { width: 100%; border-radius: 8px; margin-top: 12px; object-fit: cover; max-height: 300px; }
.tsc-post-actions { display: flex; gap: 16px; margin-top: 14px; padding-top: 12px; border-top: 1px solid #f0f0f0; }
.tsc-like-btn, .tsc-comment-toggle {
  background: none; border: none; cursor: pointer; font-size: 14px;
  color: var(--ts-muted); display: flex; align-items: center; gap: 5px; font-family: inherit;
}
.tsc-like-btn.liked, .tsc-like-btn:hover { color: #dc2626; }
.tsc-comment-toggle:hover { color: var(--ts-green); }
.tsc-source-badge { margin-left: auto; font-size: 11px; color: var(--ts-muted);
  background: #f0f0f0; padding: 2px 8px; border-radius: 20px; }

/* Comments */
.tsc-comments-wrap { margin-top: 12px; display: none; }
.tsc-comments-wrap.open { display: block; }
.tsc-comment-item { display: flex; gap: 8px; margin-bottom: 10px; }
.tsc-comment-item img { width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0; }
.tsc-comment-bubble {
  background: #f5f5f5; border-radius: 10px; padding: 7px 11px;
  font-size: 13px; flex: 1;
}
.tsc-comment-name { font-weight: 600; font-size: 12px; margin-bottom: 2px; color: var(--ts-green); }
.tsc-comment-input-row { display: flex; gap: 8px; margin-top: 10px; }
.tsc-comment-input-row input {
  flex: 1; border: 1px solid var(--ts-border); border-radius: 20px;
  padding: 7px 14px; font-size: 13px; outline: none; font-family: inherit;
}
.tsc-comment-input-row input:focus { border-color: var(--ts-green); }
.tsc-comment-input-row button { background: var(--ts-green); color: #fff; border: none;
  border-radius: 20px; padding: 7px 14px; font-size: 13px; cursor: pointer; }

.tsc-load-more-wrap { text-align: center; padding: 8px 0 4px; }

/* ─────────────────────────────────────────────────────────────────────
   WEBINARS
───────────────────────────────────────────────────────────────────── */
.tsc-webinar-grid { display: flex; flex-direction: column; gap: 16px; }
.tsc-webinar-card { overflow: hidden; padding: 0; }
.tsc-webinar-cover { width: 100%; height: 160px; object-fit: cover; }
.tsc-webinar-cover-placeholder {
  width: 100%; height: 160px; display: flex; align-items: center; justify-content: center;
  background: var(--ts-green-lt); font-size: 48px;
}
.tsc-webinar-body { padding: 14px 16px; }
.tsc-webinar-meta-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.tsc-webinar-title { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tsc-webinar-host  { font-size: 13px; color: var(--ts-muted); margin-bottom: 4px; }
.tsc-webinar-time  { font-size: 13px; color: var(--ts-muted); margin-bottom: 8px; }
.tsc-webinar-desc  { font-size: 13px; color: #555; margin-bottom: 12px; }
.tsc-webinar-footer { display: flex; align-items: center; justify-content: space-between; }
.tsc-reg-count     { font-size: 13px; color: var(--ts-muted); }
.tsc-registered-badge { font-size: 13px; color: var(--ts-green); font-weight: 600; }

/* Badges */
.tsc-badge { font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 20px; }
.tsc-badge-live     { background: #fef2f2; color: #dc2626; }
.tsc-badge-replay   { background: #eff6ff; color: #2563eb; }
.tsc-badge-upcoming { background: var(--ts-green-lt); color: var(--ts-green); }
.tsc-badge-ended    { background: #f3f4f6; color: #9ca3af; }
.tsc-badge-pending  { background: #fffbeb; color: #b45309; }
.tsc-badge-paid     { background: #f0fdf4; color: #15803d; }
.tsc-webinar-duration { font-size: 12px; color: var(--ts-muted); margin-left: auto; }

/* ─────────────────────────────────────────────────────────────────────
   AFFILIATE
───────────────────────────────────────────────────────────────────── */
.tsc-affiliate-wrap { display: flex; flex-direction: column; gap: 16px; }
.tsc-stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tsc-stat-card  { text-align: center; padding: 18px 12px; }
.tsc-stat-val   { font-size: 26px; font-weight: 700; color: var(--ts-green); }
.tsc-stat-lbl   { font-size: 13px; color: var(--ts-muted); margin-top: 4px; }
.tsc-ref-link-card label { font-weight: 600; font-size: 14px; display: block; margin-bottom: 8px; }
.tsc-ref-link-row { display: flex; gap: 8px; }
#tscRefLink {
  flex: 1; border: 1px solid var(--ts-border); border-radius: 8px;
  padding: 8px 12px; font-size: 13px; background: #f9f9f9;
  color: var(--ts-muted); outline: none;
}
.tsc-how-it-works h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }
.tsc-steps { display: flex; flex-direction: column; gap: 14px; }
.tsc-step  { display: flex; gap: 12px; align-items: flex-start; }
.tsc-step-num {
  width: 28px; height: 28px; border-radius: 50%; background: var(--ts-green);
  color: #fff; font-weight: 700; font-size: 14px; display: flex; align-items: center;
  justify-content: center; flex-shrink: 0;
}
.tsc-step p { font-size: 14px; }
.tsc-conversions-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 12px; }
.tsc-empty-text { color: var(--ts-muted); font-size: 14px; }
.tsc-table-wrap { overflow-x: auto; }
.tsc-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.tsc-table th { background: var(--ts-green-lt); color: var(--ts-green); font-weight: 600;
  padding: 8px 10px; text-align: left; }
.tsc-table td { padding: 8px 10px; border-bottom: 1px solid #f0f0f0; }

/* ─────────────────────────────────────────────────────────────────────
   TOOLS PORTAL
───────────────────────────────────────────────────────────────────── */
.tsc-tools-wrap { display: flex; flex-direction: column; gap: 16px; }
.tsc-filter-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tsc-tab {
  background: var(--ts-white); border: 2px solid var(--ts-border);
  padding: 7px 16px; border-radius: 20px; font-size: 13px; font-weight: 600;
  cursor: pointer; color: var(--ts-text); transition: all .15s; font-family: inherit;
}
.tsc-tab.active,
.tsc-tab:hover { border-color: var(--ts-green); background: var(--ts-green-lt); color: var(--ts-green); }
.tsc-tools-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tsc-tool-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 5px;
  padding: 14px 12px; text-decoration: none; color: var(--ts-text);
  transition: box-shadow .15s, transform .1s; cursor: pointer;
}
.tsc-tool-card:hover { box-shadow: 0 4px 16px rgba(26,92,56,.15); transform: translateY(-1px); }
.tsc-tool-icon   { font-size: 26px; }
.tsc-tool-icon-img { width: 28px; height: 28px; object-fit: contain; border-radius: 4px; }
.tsc-tool-name   { font-weight: 700; font-size: 13px; }
.tsc-tool-desc   { font-size: 11px; color: var(--ts-muted); line-height: 1.4; }
.tsc-ext-badge   { font-size: 10px; color: var(--ts-purple); font-weight: 600;
  background: #f3ecff; padding: 2px 6px; border-radius: 10px; margin-top: 4px; }
.tsc-tools-section[data-section="tubestack"],
.tsc-tools-section[data-section="external"] { display: block; }

/* ─────────────────────────────────────────────────────────────────────
   COURSES
───────────────────────────────────────────────────────────────────── */
.tsc-courses-wrap { display: flex; flex-direction: column; gap: 16px; position: relative; }
.tsc-course-grid  { display: grid; grid-template-columns: 1fr; gap: 16px; }
.tsc-course-card  { padding: 0; overflow: hidden; position: relative; }
.tsc-course-thumb { width: 100%; height: 160px; object-fit: cover; }
.tsc-course-thumb-placeholder {
  width: 100%; height: 160px; background: var(--ts-green-lt);
  display: flex; align-items: center; justify-content: center; font-size: 48px;
}
.tsc-lock-overlay {
  position: absolute; top: 0; left: 0; right: 0; height: 160px;
  background: rgba(0,0,0,.45); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 6px; color: #fff; font-size: 14px; font-weight: 600;
}
.tsc-lock-overlay span:first-child { font-size: 28px; }
.tsc-course-body { padding: 14px 16px; }
.tsc-course-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.tsc-tier-badge  { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 20px; }
.tsc-tier-0 { background: #f0fdf4; color: #15803d; }
.tsc-tier-1 { background: #eff6ff; color: #2563eb; }
.tsc-tier-2 { background: #fdf4ff; color: #9333ea; }
.tsc-tier-3 { background: #fff7ed; color: #c2410c; }
.tsc-lesson-count { font-size: 12px; color: var(--ts-muted); }
.tsc-course-title { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tsc-course-desc  { font-size: 13px; color: var(--ts-muted); margin-bottom: 12px; line-height: 1.45; }
.tsc-progress-bar-wrap { background: #e5e7eb; border-radius: 6px; height: 6px; margin-bottom: 6px; overflow: hidden; }
.tsc-progress-bar { height: 100%; background: var(--ts-green); border-radius: 6px; transition: width .3s; }
.tsc-progress-label { font-size: 12px; color: var(--ts-muted); margin-bottom: 12px; }
.tsc-course-card.tsc-locked { opacity: .75; }

/* Course viewer */
.tsc-course-viewer {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 1100;
  background: var(--ts-bg); display: flex; flex-direction: column;
}
.tsc-viewer-header {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  background: var(--ts-green); flex-shrink: 0;
}
.tsc-close-course {
  background: none; border: none; color: #fff; cursor: pointer;
  font-size: 14px; font-weight: 600; padding: 0; font-family: inherit;
}
#tscViewerTitle { color: #fff; font-weight: 700; font-size: 15px; flex: 1; }
.tsc-viewer-body { flex: 1; display: flex; flex-direction: column; min-height: 0; overflow-y: auto; }
.tsc-viewer-sidebar {
  background: var(--ts-white); border-bottom: 1px solid var(--ts-border);
  padding: 12px; flex-shrink: 0;
}
.tsc-module-title { font-weight: 700; font-size: 14px; color: var(--ts-green); margin: 10px 0 6px; }
.tsc-lesson-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px;
  border-radius: 8px; cursor: pointer; font-size: 13px; transition: background .1s;
}
.tsc-lesson-item:hover,
.tsc-lesson-item.active { background: var(--ts-green-lt); }
.tsc-lesson-check { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--ts-border);
  flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 10px; }
.tsc-lesson-check.done { background: var(--ts-green); border-color: var(--ts-green); color: #fff; }
.tsc-lesson-dur { margin-left: auto; font-size: 11px; color: var(--ts-muted); }
.tsc-viewer-content { padding: 16px; flex: 1; }
.tsc-viewer-placeholder { color: var(--ts-muted); font-size: 14px; text-align: center; margin-top: 40px; }
.tsc-lesson-video-wrap { position: relative; padding-top: 56.25%; margin-bottom: 16px; border-radius: 10px; overflow: hidden; }
.tsc-lesson-video-wrap iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.tsc-lesson-content-body { font-size: 15px; line-height: 1.65; }
.tsc-lesson-content-body h1,.tsc-lesson-content-body h2,.tsc-lesson-content-body h3 { color: var(--ts-green); margin: 16px 0 8px; }
.tsc-mark-done-btn { margin-top: 20px; }

/* ─────────────────────────────────────────────────────────────────────
   DESKTOP  (≥ 768px)
───────────────────────────────────────────────────────────────────── */
@media (min-width: 768px) {

  .tsc-page-body { padding: 20px 24px calc(var(--tab-h) + 20px); max-width: 1100px; margin-top: var(--nav-h); margin-left: auto; margin-right: auto; }

  .tsc-nav-links { display: flex; }
  .tsc-burger    { display: none; }

  /* Chat: side-by-side */
  .tsc-chat-wrap { flex-direction: row; height: calc(100vh - var(--nav-h) - var(--tab-h)); }
  .tsc-groups-list { width: 280px; flex-shrink: 0; margin-top: 0; display: flex; flex-direction: column; }
  .tsc-groups-items { flex: 1; max-height: none; }
  .tsc-chat-panel { margin-top: 0; margin-left: 12px; }

  /* Course viewer: sidebar + content side-by-side */
  .tsc-viewer-body { flex-direction: row; overflow-y: hidden; }
  .tsc-viewer-sidebar { width: 300px; flex-shrink: 0; overflow-y: auto; border-bottom: none; border-right: 1px solid var(--ts-border); }
  .tsc-viewer-content { overflow-y: auto; }

  /* Grids */
  .tsc-tools-grid { grid-template-columns: repeat(4, 1fr); }
  .tsc-course-grid { grid-template-columns: repeat(2, 1fr); }
  .tsc-stats-grid  { grid-template-columns: repeat(4, 1fr); }
  .tsc-webinar-grid { display: grid; grid-template-columns: repeat(2, 1fr); }

  /* Bottom tabs hidden on wide screens (nav covers it) */
  .tsc-bottom-tabs { display: none; }
  .tsc-page-body   { padding-bottom: 24px; }
}

@media (min-width: 1024px) {
  .tsc-tools-grid { grid-template-columns: repeat(5, 1fr); }
  .tsc-course-grid { grid-template-columns: repeat(3, 1fr); }
}