/* ===== TUTORIAL PAGE — GOD-TIER UI ===== */
.tutorial-page { display: flex; min-height: 100vh; }

/* ===== SIDEBAR ===== */
.tutorial-sidebar {
  width: 280px; background: rgba(8,8,16,0.95); border-right: 1px solid var(--border);
  position: fixed; top: 0; left: 0; bottom: 0; overflow-y: auto; z-index: 100;
  backdrop-filter: blur(20px); display: flex; flex-direction: column;
}
.tutorial-sidebar::-webkit-scrollbar { width: 3px; }
.tutorial-sidebar::-webkit-scrollbar-thumb { background: rgba(108,99,255,0.3); border-radius: 2px; }

.ts-header {
  padding: 1.5rem 1.5rem 1.25rem; border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.ts-header::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(108,99,255,0.06) 0%, transparent 50%);
  pointer-events: none;
}
.ts-logo {
  font-family: var(--font-mono); font-size: 1.1rem; font-weight: 700; color: var(--text);
  text-decoration: none; display: block; margin-bottom: 0.3rem; position: relative;
}
.ts-logo span { color: var(--accent); font-weight: 800; }
.ts-subtitle {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--green);
  letter-spacing: 0.2em; text-transform: uppercase; position: relative;
  display: inline-flex; align-items: center; gap: 0.4rem;
}
.ts-subtitle::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--green);
  animation: tsPulse 2s infinite;
}
@keyframes tsPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0,230,118,0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 4px rgba(0,230,118,0); }
}

/* ===== TRACKING PROFILE ===== */
.ts-profile {
  padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--border);
  text-align: center;
}
.ts-profile-level {
  font-size: 13px; font-weight: 700; color: var(--accent);
  margin-bottom: 6px;
}
.ts-profile-xp-bar {
  height: 5px; background: rgba(255,255,255,0.06);
  border-radius: 3px; overflow: hidden; margin-bottom: 3px;
}
.ts-profile-xp-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), #00e676);
  border-radius: 3px; transition: width 0.5s ease;
}
.ts-profile-xp-text {
  font-size: 10px; color: var(--text-2); margin-bottom: 6px;
}
.ts-profile-row {
  display: flex; justify-content: space-around;
}
.ts-profile-stat {
  display: flex; flex-direction: column; align-items: center;
}
.ts-profile-stat span:first-child {
  font-size: 14px; font-weight: 700; color: var(--text);
}
.ts-profile-stat span:last-child {
  font-size: 10px; color: var(--text-3);
}
.ts-login-prompt {
  padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--border);
  text-align: center;
}
.ts-login-prompt p {
  font-size: 11px; color: var(--text-2); margin-bottom: 6px;
}
.ts-start-btn {
  display: inline-block; padding: 6px 14px;
  background: var(--accent); color: #fff; border-radius: 8px;
  font-size: 11px; font-weight: 600; text-decoration: none;
}
.ts-start-btn:hover { background: #7c73ff; }

.ts-stats {
  display: flex; gap: 0.5rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--border);
}
.ts-stat {
  flex: 1; text-align: center; padding: 0.5rem 0;
  background: rgba(108,99,255,0.04); border-radius: 8px; border: 1px solid rgba(108,99,255,0.08);
}
.ts-stat-num {
  font-family: var(--font-mono); font-size: 1rem; font-weight: 700; color: var(--accent);
  display: block;
}
.ts-stat-label {
  font-size: 0.55rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.1em;
}

.ts-search {
  padding: 0.75rem 1.5rem; position: relative;
}
.ts-search input {
  width: 100%; padding: 0.6rem 0.75rem 0.6rem 2rem;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 0.78rem;
  font-family: var(--font-body); outline: none; transition: border-color 0.2s;
}
.ts-search input:focus { border-color: var(--accent); }
.ts-search input::placeholder { color: var(--text-3); }
.ts-search svg {
  position: absolute; left: 2rem; top: 50%; transform: translateY(-50%);
  color: var(--text-3); width: 14px; height: 14px;
}

.ts-section { padding: 0.5rem 1.25rem; }
.ts-section-title {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-3);
  letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 0.5rem;
  padding-left: 0.25rem; display: flex; align-items: center; gap: 0.5rem;
}
.ts-section-title::after {
  content: ''; flex: 1; height: 1px; background: rgba(255,255,255,0.04);
}
.ts-topic {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.5rem 0.75rem;
  border-radius: 8px; cursor: pointer; transition: all 0.2s; font-size: 0.8rem;
  color: var(--text-2); margin-bottom: 1px; text-decoration: none; position: relative;
  border: 1px solid transparent;
}
.ts-topic:hover {
  background: rgba(108,99,255,0.06); color: var(--text);
  border-color: rgba(108,99,255,0.1);
}
.ts-topic.active {
  background: rgba(108,99,255,0.12); color: var(--accent);
  border-color: rgba(108,99,255,0.2);
}
.ts-topic-icon { font-size: 1rem; width: 22px; text-align: center; flex-shrink: 0; }
.ts-topic-name { flex: 1; font-weight: 500; }
.ts-topic-count {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-3);
  background: rgba(255,255,255,0.04); padding: 2px 6px; border-radius: 4px;
  min-width: 20px; text-align: center;
}
.ts-topic-progress {
  position: absolute; bottom: 0; left: 0.75rem; right: 0.75rem; height: 2px;
  background: rgba(255,255,255,0.04); border-radius: 1px; overflow: hidden;
}
.ts-topic-progress-fill {
  height: 100%; background: var(--green); border-radius: 1px; transition: width 0.3s;
}

.ts-footer {
  margin-top: auto; padding: 1rem 1.25rem; border-top: 1px solid var(--border);
}
.ts-footer-link {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.5rem 0.75rem;
  border-radius: 8px; font-size: 0.8rem; color: var(--text-2); text-decoration: none;
  transition: all 0.2s;
}
.ts-footer-link:hover { background: rgba(108,99,255,0.06); color: var(--text); }

/* ===== MAIN CONTENT ===== */
.tutorial-main {
  flex: 1; margin-left: 280px; padding: 2rem 3rem; position: relative;
}

/* Hero Section */
.tutorial-hero {
  max-width: 900px; margin: 0 auto 2.5rem; text-align: center;
  position: relative; padding: 2rem 0;
}
.tutorial-hero::before {
  content: ''; position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 400px;
  background: radial-gradient(ellipse, rgba(108,99,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.th-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--green);
  background: rgba(0,230,118,0.06); border: 1px solid rgba(0,230,118,0.15);
  padding: 0.35rem 0.85rem; border-radius: 20px; margin-bottom: 1.25rem;
  position: relative; letter-spacing: 0.05em;
}
.th-badge::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--green);
  animation: tsPulse 2s infinite;
}
.th-title {
  font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; line-height: 1.15;
  margin-bottom: 0.75rem; position: relative;
}
.th-title .grad {
  background: linear-gradient(135deg, var(--accent), #00f5d4, #9b5de5);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.th-sub {
  font-size: 1rem; color: var(--text-2); line-height: 1.6; max-width: 600px;
  margin: 0 auto 1.5rem; position: relative;
}
.th-stats {
  display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; position: relative;
}
.th-stat {
  display: flex; flex-direction: column; align-items: center; gap: 0.15rem;
}
.th-stat-num {
  font-family: var(--font-mono); font-size: 1.5rem; font-weight: 800; color: var(--text);
  line-height: 1;
}
.th-stat-label {
  font-size: 0.65rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.1em;
}

/* GitHub Live Banner */
.gh-banner {
  max-width: 900px; margin: 0 auto 2rem; padding: 1rem 1.5rem;
  background: rgba(108,99,255,0.04); border: 1px solid rgba(108,99,255,0.1);
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  gap: 2rem; flex-wrap: wrap; position: relative; overflow: hidden;
}
.gh-banner::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.gh-banner__item {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-2);
}
.gh-banner__num { font-weight: 700; color: var(--text); }
.gh-banner__dot {
  width: 3px; height: 3px; border-radius: 50%; background: var(--text-3);
}

/* Category Filters */
.tf-filters {
  max-width: 900px; margin: 0 auto 1.5rem; display: flex; gap: 0.4rem;
  flex-wrap: wrap; align-items: center;
}
.tf-filter {
  padding: 0.45rem 0.85rem; border: 1px solid var(--border); background: transparent;
  border-radius: 20px; color: var(--text-3); font-family: var(--font-mono);
  font-size: 0.72rem; cursor: pointer; transition: all 0.2s; white-space: nowrap;
}
.tf-filter:hover { border-color: rgba(108,99,255,0.3); color: var(--text-2); }
.tf-filter.active {
  background: rgba(108,99,255,0.12); border-color: var(--accent);
  color: var(--accent); font-weight: 600;
}
.tf-search {
  margin-left: auto; position: relative;
}
.tf-search input {
  width: 220px; padding: 0.45rem 0.75rem 0.45rem 2rem;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 20px; color: var(--text); font-size: 0.78rem;
  font-family: var(--font-body); outline: none; transition: all 0.2s;
}
.tf-search input:focus { border-color: var(--accent); width: 280px; }
.tf-search input::placeholder { color: var(--text-3); }
.tf-search svg {
  position: absolute; left: 0.7rem; top: 50%; transform: translateY(-50%);
  color: var(--text-3); width: 13px; height: 13px;
}

/* Course Cards Grid */
.tw-grid {
  max-width: 900px; margin: 0 auto; display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0.75rem;
}
.tw-card {
  background: rgba(12,12,24,0.6); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.5rem; cursor: pointer; transition: all 0.3s; position: relative;
  overflow: hidden; text-decoration: none; color: inherit; display: flex;
  flex-direction: column;
}
.tw-card::before {
  content: ''; position: absolute; inset: 0; border-radius: 14px;
  background: linear-gradient(135deg, rgba(108,99,255,0.04), rgba(0,245,212,0.02));
  opacity: 0; transition: opacity 0.3s;
}
.tw-card::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), #00f5d4);
  transform: scaleX(0); transform-origin: left; transition: transform 0.4s;
}
.tw-card:hover {
  border-color: rgba(108,99,255,0.35); transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.12), 0 0 0 1px rgba(108,99,255,0.08);
}
.tw-card:hover::before { opacity: 1; }
.tw-card:hover::after { transform: scaleX(1); }
.tw-card:hover .tw-card-icon { transform: scale(1.1); }

.tw-card-top {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 0.75rem; position: relative;
}
.tw-card-icon {
  font-size: 2rem; transition: transform 0.3s; line-height: 1;
}
.tw-card-badge {
  font-family: var(--font-mono); font-size: 0.55rem; padding: 0.2rem 0.5rem;
  border-radius: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
}
.tw-card-badge.beginner { background: rgba(0,230,118,0.1); color: var(--green); border: 1px solid rgba(0,230,118,0.2); }
.tw-card-badge.intermediate { background: rgba(108,99,255,0.1); color: var(--accent); border: 1px solid rgba(108,99,255,0.2); }
.tw-card-badge.advanced { background: rgba(255,107,107,0.1); color: #ff6b6b; border: 1px solid rgba(255,107,107,0.2); }

.tw-card-title {
  font-size: 1.05rem; font-weight: 700; margin-bottom: 0.35rem; color: var(--text);
  position: relative;
}
.tw-card-desc {
  font-size: 0.78rem; color: var(--text-2); line-height: 1.5; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; position: relative;
}
.tw-card-meta {
  display: flex; align-items: center; gap: 0.75rem; margin-top: 1rem;
  padding-top: 0.75rem; border-top: 1px solid var(--border); position: relative;
}
.tw-card-count {
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--accent);
  display: flex; align-items: center; gap: 0.3rem;
}
.tw-card-time {
  font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-3);
  display: flex; align-items: center; gap: 0.3rem;
}
.tw-card-arrow {
  margin-left: auto; width: 24px; height: 24px; border-radius: 50%;
  background: rgba(108,99,255,0.08); display: flex; align-items: center;
  justify-content: center; transition: all 0.3s; color: var(--accent); font-size: 0.7rem;
}
.tw-card:hover .tw-card-arrow {
  background: var(--accent); color: #fff; transform: translateX(3px);
}

/* Card progress bar */
.tw-card-progress {
  width: 100%; height: 3px; background: rgba(255,255,255,0.04); border-radius: 2px;
  margin-top: 0.75rem; overflow: hidden; position: relative;
}
.tw-card-progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--green));
  border-radius: 2px; transition: width 0.5s ease;
}

/* Empty state */
.tw-empty {
  grid-column: 1 / -1; text-align: center; padding: 4rem 2rem;
  color: var(--text-3);
}
.tw-empty svg { margin-bottom: 1rem; opacity: 0.3; }
.tw-empty p { font-size: 0.9rem; }

/* ===== TUTORIAL VIEW ===== */
.tutorial-view { display: none; max-width: 800px; margin: 0 auto; }
.tutorial-view.active { display: block; }

.tv-header { margin-bottom: 2rem; position: relative; }
.tv-back {
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent);
  cursor: pointer; display: inline-flex; align-items: center; gap: 0.5rem;
  margin-bottom: 1rem; transition: color 0.2s; background: none; border: none;
}
.tv-back:hover { color: var(--green); }
.tv-title { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
.tv-meta { font-size: 0.8rem; color: var(--text-2); }

/* Lesson List */
.lesson-list { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 2rem; }
.lesson-item {
  display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem;
  background: rgba(12,12,24,0.5); border: 1px solid var(--border); border-radius: 10px;
  cursor: pointer; transition: all 0.25s; position: relative; overflow: hidden;
}
.lesson-item::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent); transform: scaleY(0); transition: transform 0.25s;
}
.lesson-item:hover {
  border-color: rgba(108,99,255,0.3); background: rgba(108,99,255,0.04);
}
.lesson-item:hover::before { transform: scaleY(1); }
.lesson-item.active {
  border-color: var(--accent); background: rgba(108,99,255,0.08);
}
.lesson-item.active::before { transform: scaleY(1); }
.lesson-num {
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-3);
  min-width: 28px; font-weight: 600;
}
.lesson-info { flex: 1; }
.lesson-name { font-size: 0.88rem; font-weight: 600; margin-bottom: 0.2rem; }
.lesson-desc { font-size: 0.72rem; color: var(--text-2); }
.lesson-status {
  width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--text-3);
  display: flex; align-items: center; justify-content: center; font-size: 0.6rem;
  transition: all 0.25s; flex-shrink: 0;
}
.lesson-status.done { background: var(--green); border-color: var(--green); color: #000; }

/* Progress Bar */
.progress-bar {
  width: 100%; height: 4px; background: rgba(255,255,255,0.04); border-radius: 2px;
  margin-top: 1rem; overflow: hidden;
}
.progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--green));
  border-radius: 2px; transition: width 0.5s ease;
}

/* AI Chat */
.ai-chat {
  background: rgba(12,12,24,0.6); border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; margin-top: 2rem; position: relative;
}
.ai-chat::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.ai-chat-header {
  padding: 1rem 1.5rem; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.75rem;
}
.ai-avatar {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #00f5d4);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; color: #fff;
}
.ai-name { font-size: 0.85rem; font-weight: 600; }
.ai-model {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--green);
  display: flex; align-items: center; gap: 0.3rem;
}
.ai-model::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%; background: var(--green);
}
.ai-messages {
  height: 400px; overflow-y: auto; padding: 1.5rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.ai-messages::-webkit-scrollbar { width: 3px; }
.ai-messages::-webkit-scrollbar-thumb { background: rgba(108,99,255,0.3); border-radius: 2px; }
.ai-msg {
  max-width: 85%; padding: 0.85rem 1.1rem; border-radius: 12px;
  font-size: 0.85rem; line-height: 1.6; animation: msgIn 0.3s ease;
}
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.ai-msg.user {
  align-self: flex-end; background: var(--accent); color: #fff;
  border-bottom-right-radius: 4px;
}
.ai-msg.bot {
  align-self: flex-start; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border); border-bottom-left-radius: 4px;
}
.ai-msg pre {
  background: #0d1117; padding: 0.75rem 1rem; border-radius: 8px;
  overflow-x: auto; margin: 0.75rem 0; font-family: var(--font-mono);
  font-size: 0.78rem; line-height: 1.5;
}
.ai-msg code {
  font-family: var(--font-mono); font-size: 0.8rem;
  background: rgba(108,99,255,0.12); padding: 1px 5px; border-radius: 3px;
}
.ai-msg pre code { background: none; padding: 0; }
.ai-typing { display: flex; gap: 4px; padding: 0.5rem 0; }
.ai-typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  animation: typingDot 1.4s infinite ease-in-out;
}
.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingDot { 0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; } 40% { transform: scale(1); opacity: 1; } }
.ai-input-area {
  padding: 1rem 1.5rem; border-top: 1px solid var(--border); display: flex; gap: 0.75rem;
}
.ai-input {
  flex: 1; background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 10px; padding: 0.75rem 1rem; color: var(--text);
  font-family: var(--font-body); font-size: 0.85rem; outline: none;
  transition: border-color 0.2s;
}
.ai-input:focus { border-color: var(--accent); }
.ai-send {
  background: var(--accent); border: none; border-radius: 10px;
  padding: 0.75rem 1.25rem; color: #fff; font-family: var(--font-mono);
  font-size: 0.8rem; cursor: pointer; transition: all 0.2s; white-space: nowrap;
  font-weight: 600;
}
.ai-send:hover { background: #5a52e0; transform: translateY(-1px); }
.ai-send:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Quick Actions */
.quick-actions { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.75rem; }
.quick-btn {
  background: rgba(108,99,255,0.06); border: 1px solid rgba(108,99,255,0.15);
  border-radius: 8px; padding: 0.4rem 0.75rem; font-size: 0.7rem;
  color: var(--accent); cursor: pointer; transition: all 0.2s;
  font-family: var(--font-mono);
}
.quick-btn:hover {
  background: rgba(108,99,255,0.15); border-color: var(--accent);
  transform: translateY(-1px);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .tutorial-sidebar { display: none; }
  .tutorial-main { margin-left: 0; padding: 1.5rem; }
  .tw-grid { grid-template-columns: 1fr; }
  .th-title { font-size: 1.8rem; }
  .gh-banner { gap: 1rem; }
  .tf-search input { width: 160px; }
  .tf-search input:focus { width: 200px; }
  .ai-messages { height: 300px; }
}