/* ============ RESET ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: #141311;
  color: #E8E4DD;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
a { color: inherit; text-decoration: none; transition: color .2s; }
h1, h2, h3, h4 { font-family: 'Fraunces', Georgia, serif; font-weight: 500; letter-spacing: -0.01em; line-height: 1.15; }
::selection { background: rgba(201,151,74,0.35); color: #fff; }

/* ============ TOKENS ============ */
:root {
  --bg: #141311;
  --panel: #1E1C19;
  --panel-2: #26231F;
  --panel-3: #2E2A25;
  --line: rgba(255,255,255,0.06);
  --line-2: rgba(255,255,255,0.1);
  --ink: #E8E4DD;
  --ink-2: rgba(232,228,221,0.65);
  --ink-3: rgba(232,228,221,0.4);
  --gold: #C9974A;
  --gold-2: #E0B060;
  --success: #6FBF73;
}

/* ============ LAYOUT ============ */
body { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }

/* ============ SIDEBAR ============ */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 24px 20px;
  overflow-y: auto;
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; gap: 20px;
}
.sidebar__logo { display: flex; align-items: center; gap: 12px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.sidebar__logo-mark {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gold); color: #1E1E1C;
  display: grid; place-items: center;
  font-family: 'Fraunces', serif; font-weight: 600; font-size: 14px;
  flex-shrink: 0;
}
.sidebar__logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.sidebar__logo-text strong { font-size: 14px; font-weight: 600; }
.sidebar__logo-text em { font-style: normal; font-size: 12px; color: var(--ink-3); }

.sidebar__user {
  display: flex; align-items: center; gap: 12px;
  padding: 14px; border-radius: 12px; background: var(--panel-2);
}
.sidebar__avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: #8b6f4e; color: #fff;
  display: grid; place-items: center; font-weight: 600; font-size: 13px;
  flex-shrink: 0;
}
.sidebar__name { font-size: 14px; font-weight: 500; }
.sidebar__meta { font-size: 12px; color: var(--ink-3); }

.sidebar__progress { padding: 0 4px; }
.sidebar__progress-head {
  display: flex; justify-content: space-between; margin-bottom: 8px;
  font-size: 12px; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.5px;
}
.sidebar__progress-val { color: var(--gold); font-weight: 600; }
.progress-track {
  height: 6px; background: rgba(255,255,255,0.06); border-radius: 100px; overflow: hidden;
}
.progress-bar {
  height: 100%; border-radius: 100px;
  background: linear-gradient(90deg, var(--gold), var(--gold-2));
  animation: fill 1.4s cubic-bezier(.22,1,.36,1);
}
@keyframes fill { from { width: 0 !important; } }

.sidebar__nav { display: flex; flex-direction: column; gap: 2px; padding: 4px 0; border-top: 1px solid var(--line); padding-top: 20px; }
.sidebar__section {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 14px; color: var(--ink-2); position: relative;
  transition: background .2s, color .2s;
}
.sidebar__section:hover { background: var(--panel-2); color: var(--ink); }
.sidebar__section.active { background: rgba(201,151,74,0.1); color: var(--gold); }
.sidebar__section-ico { font-size: 16px; }
.badge {
  margin-left: auto; background: var(--gold); color: #1E1E1C;
  font-size: 11px; font-weight: 700; padding: 2px 7px; border-radius: 100px;
}

.sidebar__lessons-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--ink-3); padding: 12px 12px 6px; border-top: 1px solid var(--line);
}
.sidebar__lessons { display: flex; flex-direction: column; gap: 2px; padding-bottom: 20px; }
.lesson-item {
  display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: center;
  padding: 10px 12px; border-radius: 10px;
  transition: background .2s;
}
.lesson-item:hover { background: var(--panel-2); }
.lesson-item__num {
  font-family: 'Fraunces', serif; font-size: 13px;
  width: 28px; height: 28px; border-radius: 50%;
  border: 1px solid var(--line-2);
  display: grid; place-items: center; color: var(--ink-3);
}
.lesson-item__body { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.lesson-item__title { font-size: 13px; font-weight: 500; }
.lesson-item__meta { font-size: 11px; color: var(--ink-3); }

.lesson-item--done .lesson-item__num { border-color: rgba(111,191,115,0.4); color: var(--success); }
.lesson-item--done .lesson-item__meta { color: var(--success); }

.lesson-item--active { background: rgba(201,151,74,0.12); }
.lesson-item--active .lesson-item__num { border-color: var(--gold); color: var(--gold); background: rgba(201,151,74,0.15); }
.lesson-item--active .lesson-item__title { color: #fff; }
.lesson-item--active .lesson-item__meta { color: var(--gold); }

.lesson-item--locked { opacity: 0.45; }
.lesson-item--locked:hover { background: transparent; cursor: not-allowed; }

/* ============ MAIN ============ */
.main { padding: 0; min-width: 0; }

/* ============ TOPBAR ============ */
.topbar {
  display: flex; align-items: center; gap: 20px;
  padding: 18px 40px;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  background: rgba(20,19,17,0.85);
  backdrop-filter: blur(12px);
}
.topbar__burger { display: none; flex-direction: column; gap: 4px; padding: 8px; }
.topbar__burger span { display: block; width: 20px; height: 2px; background: var(--ink); }
.breadcrumbs { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-3); flex: 1; }
.breadcrumbs a { color: var(--ink-2); }
.breadcrumbs a:hover { color: var(--gold); }
.breadcrumbs span:last-child { color: var(--ink); }
.topbar__actions { display: flex; align-items: center; gap: 12px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--panel-2); color: var(--ink-2);
  display: grid; place-items: center; position: relative;
  transition: background .2s, color .2s;
}
.icon-btn:hover { background: var(--panel-3); color: var(--ink); }
.icon-btn__dot {
  position: absolute; top: 10px; right: 10px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--gold); border: 2px solid var(--panel-2);
}
.topbar__streak {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 100px;
  background: rgba(201,151,74,0.1); color: var(--gold);
  font-size: 13px;
}
.topbar__streak strong { font-weight: 700; }

/* ============ LESSON ============ */
.lesson { padding: 40px 40px 80px; max-width: 900px; margin: 0 auto; }

.lesson__head { margin-bottom: 32px; }
.lesson__label { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.lesson__label-num {
  padding: 4px 12px; border-radius: 100px;
  background: rgba(201,151,74,0.12); color: var(--gold);
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
}
.lesson__label-day {
  font-size: 12px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 1px;
}
.lesson__title { font-size: clamp(28px, 4vw, 40px); margin-bottom: 14px; color: #fff; }
.lesson__lead { font-size: 17px; color: var(--ink-2); max-width: 640px; margin-bottom: 18px; }
.lesson__meta { display: flex; gap: 10px; font-size: 13px; color: var(--ink-3); flex-wrap: wrap; }

/* Video */
.video {
  border-radius: 16px; overflow: hidden;
  background: #000;
  margin-bottom: 40px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.4);
}
.video__stage { aspect-ratio: 16/9; }
.video__poster { width: 100%; height: 100%; }
.video__controls {
  display: grid; grid-template-columns: 40px 1fr auto auto auto; gap: 14px;
  align-items: center; padding: 14px 20px;
  background: var(--panel-2); border-top: 1px solid var(--line);
}
.video__play {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gold); color: #1E1E1C;
  display: grid; place-items: center; font-size: 14px;
  transition: transform .2s;
}
.video__play:hover { transform: scale(1.08); }
.video__timeline {
  height: 4px; background: rgba(255,255,255,0.1); border-radius: 100px;
  cursor: pointer; position: relative;
}
.video__timeline-fill {
  height: 100%; background: linear-gradient(90deg, var(--gold), var(--gold-2));
  border-radius: 100px; position: relative;
}
.video__timeline-fill::after {
  content: ''; position: absolute; right: -6px; top: 50%; transform: translateY(-50%);
  width: 12px; height: 12px; border-radius: 50%; background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201,151,74,0.25);
}
.video__time { font-size: 13px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.video__speed {
  padding: 4px 10px; border-radius: 6px;
  background: rgba(255,255,255,0.06);
  font-size: 12px; font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 100px; font-size: 14px; font-weight: 500;
  transition: transform .2s, background .2s, color .2s;
}
.btn--gold { background: var(--gold); color: #1E1E1C; }
.btn--gold:hover { background: var(--gold-2); transform: translateY(-1px); }
.btn--ghost-dark { border: 1px solid var(--line-2); color: var(--ink); background: transparent; }
.btn--ghost-dark:hover { background: var(--panel-2); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Lesson grid */
.lesson__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 32px;
}
.lesson__col {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 24px;
}
.col-title {
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--ink-3); margin-bottom: 18px; font-family: 'Inter', sans-serif;
}

/* Chapters */
.chapters { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.chapter {
  display: grid; grid-template-columns: 50px 1fr; gap: 12px; align-items: center;
  padding: 10px 12px; border-radius: 10px;
  font-size: 14px; color: var(--ink-2);
  border-left: 2px solid transparent;
}
.chapter:hover { background: var(--panel-2); }
.chapter__time {
  font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums;
  font-family: 'Fraunces', serif;
}
.chapter--done { color: var(--ink-3); }
.chapter--done .chapter__time { color: var(--success); }
.chapter--current {
  background: rgba(201,151,74,0.1); color: #fff; border-left-color: var(--gold);
}
.chapter--current .chapter__time { color: var(--gold); }

/* Checklist */
.checklist { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.check-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  background: var(--panel-2); font-size: 14px;
  transition: background .2s;
  cursor: pointer;
}
.check-item:hover { background: var(--panel-3); }
.check-box {
  width: 18px; height: 18px; border-radius: 6px;
  border: 1.5px solid var(--line-2); flex-shrink: 0;
  position: relative;
}
.check-item--done .check-box {
  background: var(--gold); border-color: var(--gold);
}
.check-item--done .check-box::after {
  content: '✓'; position: absolute; inset: 0;
  display: grid; place-items: center; color: #1E1E1C;
  font-size: 12px; font-weight: 700;
}
.check-item--done span:last-child { text-decoration: line-through; color: var(--ink-3); }

/* Homework */
.homework {
  background: linear-gradient(135deg, rgba(201,151,74,0.08), rgba(201,151,74,0.02));
  border: 1px solid rgba(201,151,74,0.25);
  border-radius: 16px; padding: 32px;
  display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; align-items: center;
  margin-bottom: 32px;
}
.homework__label {
  display: inline-block; padding: 4px 12px; border-radius: 100px;
  background: rgba(201,151,74,0.2); color: var(--gold);
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 14px;
}
.homework h3 { font-size: 22px; color: #fff; margin-bottom: 8px; }
.homework p { color: var(--ink-2); font-size: 14px; margin-bottom: 14px; }
.homework__deadline {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--gold);
}
.homework__actions {
  display: flex; flex-direction: column; gap: 10px;
}

/* Materials */
.materials { margin-bottom: 32px; }
.materials__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.material {
  display: flex; align-items: center; gap: 14px;
  padding: 16px; border-radius: 12px;
  background: var(--panel); border: 1px solid var(--line);
  transition: background .2s, border-color .2s;
}
.material:hover { background: var(--panel-2); border-color: rgba(201,151,74,0.3); }
.material__ico { font-size: 24px; }
.material__name { font-size: 14px; font-weight: 500; margin-bottom: 2px; }
.material__meta { font-size: 12px; color: var(--ink-3); }

/* Mentor */
.mentor {
  display: grid; grid-template-columns: auto 1fr auto; gap: 20px; align-items: center;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 24px; margin-bottom: 24px;
}
.mentor__avatar {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--gold); color: #1E1E1C;
  display: grid; place-items: center;
  font-family: 'Fraunces', serif; font-size: 18px; font-weight: 600;
}
.mentor__label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--gold); margin-bottom: 4px;
}
.mentor h4 { font-size: 18px; color: #fff; }
.mentor p { font-size: 13px; color: var(--ink-2); }

/* Next lesson */
.next-lesson {
  display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center;
  padding: 24px; border-radius: 16px;
  background: var(--panel); border: 1px dashed var(--line-2);
}
.next-lesson__label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--ink-3); margin-bottom: 4px;
}
.next-lesson__title { font-family: 'Fraunces', serif; font-size: 18px; color: #fff; margin-bottom: 4px; }
.next-lesson__meta { font-size: 13px; color: var(--ink-3); }

/* ============ APPROVED HOMEWORK BANNER ============ */
.hw-approved {
  display: grid; grid-template-columns: auto 1fr auto; gap: 20px; align-items: center;
  background: linear-gradient(135deg, rgba(111,191,115,0.12), rgba(111,191,115,0.03));
  border: 1px solid rgba(111,191,115,0.3);
  border-radius: 16px; padding: 22px 26px; margin-bottom: 32px;
}
.hw-approved__ico {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--success); color: #0e1a10;
  display: grid; place-items: center; font-size: 22px; font-weight: 700;
  flex-shrink: 0;
}
.hw-approved__label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--success); margin-bottom: 4px; font-weight: 600;
}
.hw-approved__title { font-family: 'Inter', sans-serif; font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.hw-approved__sub { font-size: 13px; color: var(--ink-2); }
.hw-approved__link { color: var(--gold); font-size: 13px; font-weight: 500; }
.hw-approved__link:hover { color: var(--gold-2); }

/* ============ CHAT WITH MENTOR ============ */
.chat {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; overflow: hidden;
  margin-bottom: 32px;
}
.chat__head {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 22px; border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.chat__avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gold); color: #1E1E1C;
  display: grid; place-items: center;
  font-family: 'Fraunces', serif; font-weight: 600; font-size: 14px;
  position: relative;
  flex-shrink: 0;
}
.chat__avatar::after {
  content: ''; position: absolute; bottom: -2px; right: -2px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--success); border: 2px solid var(--panel-2);
}
.chat__title { font-size: 15px; font-weight: 600; color: #fff; }
.chat__status { font-size: 12px; color: var(--success); display: flex; align-items: center; gap: 6px; }
.chat__body {
  padding: 20px 22px;
  max-height: 340px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
}
.chat__date {
  text-align: center; font-size: 11px; color: var(--ink-3);
  text-transform: uppercase; letter-spacing: 1px;
  margin: 4px 0;
}
.msg {
  max-width: 80%; padding: 12px 16px; border-radius: 16px;
  font-size: 14px; line-height: 1.5;
  animation: msgIn .4s cubic-bezier(.22,1,.36,1);
}
@keyframes msgIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.msg--mentor {
  background: var(--panel-2); border-bottom-left-radius: 4px;
  color: var(--ink); align-self: flex-start;
}
.msg--me {
  background: var(--gold); color: #1E1E1C; border-bottom-right-radius: 4px;
  align-self: flex-end; font-weight: 500;
}
.msg__time { display: block; font-size: 11px; opacity: 0.55; margin-top: 4px; }

.chat__form {
  display: grid; grid-template-columns: 1fr auto; gap: 10px;
  padding: 16px 22px; border-top: 1px solid var(--line);
  background: var(--panel-2);
}
.chat__input {
  padding: 12px 16px; border-radius: 100px;
  background: var(--panel-3); border: 1px solid var(--line-2);
  color: var(--ink); font-size: 14px; font-family: inherit;
  outline: none; transition: border-color .2s;
}
.chat__input:focus { border-color: var(--gold); }
.chat__input::placeholder { color: var(--ink-3); }
.chat__send {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gold); color: #1E1E1C;
  display: grid; place-items: center;
  transition: transform .2s, background .2s;
}
.chat__send:hover { background: var(--gold-2); transform: scale(1.05); }

/* ============ OBJECTIONS DECK ============ */
.objections { margin-bottom: 32px; }
.objections__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.obj-card {
  padding: 20px; border-radius: 14px;
  background: var(--panel); border: 1px solid var(--line);
  transition: border-color .2s, transform .2s;
  cursor: pointer;
}
.obj-card:hover { border-color: rgba(201,151,74,0.4); transform: translateY(-2px); }
.obj-card__q {
  font-family: 'Fraunces', serif; font-style: italic;
  font-size: 15px; color: #fff; margin-bottom: 10px;
  padding-left: 16px; border-left: 2px solid var(--gold);
}
.obj-card__label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--gold); margin-bottom: 4px; font-weight: 600;
}
.obj-card__a { font-size: 13px; color: var(--ink-2); line-height: 1.6; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  body { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0; z-index: 50;
    width: 300px; transform: translateX(-100%);
    transition: transform .3s;
  }
  .sidebar.is-open { transform: translateX(0); box-shadow: 20px 0 60px rgba(0,0,0,0.5); }
  .topbar__burger { display: flex; }
  .topbar { padding: 16px 20px; }
  .lesson { padding: 24px 20px 60px; }
  .lesson__grid { grid-template-columns: 1fr; }
  .homework { grid-template-columns: 1fr; gap: 20px; }
  .homework__actions { flex-direction: row; }
  .materials__grid { grid-template-columns: 1fr; }
  .mentor { grid-template-columns: 1fr; text-align: center; }
  .mentor__avatar { margin: 0 auto; }
  .next-lesson { grid-template-columns: 1fr; }
  .video__controls { grid-template-columns: 40px 1fr auto; }
  .video__speed, .video__controls .icon-btn { display: none; }
}
@media (max-width: 520px) {
  .lesson__title { font-size: 26px; }
  .topbar__streak { display: none; }
  .lesson__meta { font-size: 12px; }
  .homework { padding: 22px; }
  .homework__actions { flex-direction: column; }
}