/* =====================================================
   Onur Tutan Akademi — Premium UI
   ===================================================== */

:root {
  --ota-gold:       #C9A84C;
  --ota-gold-light: #E8D5A3;
  --ota-gold-dark:  #8C7234;
  --ota-dark:       #0A0A0A;
  --ota-surface:    #111111;
  --ota-surface2:   #1A1A1A;
  --ota-surface3:   #222222;
  --ota-border:     rgba(201,168,76,0.18);
  --ota-border2:    rgba(255,255,255,0.08);
  --ota-text:       #F0EDE8;
  --ota-text-muted: #888882;
  --ota-radius:     8px;
  --ota-radius-lg:  12px;
  --ota-transition: all 0.25s cubic-bezier(.4,0,.2,1);
}

/* ── Course Archive ────────────────────────────────── */
.ota-archive {
  padding: 60px 0;
}

.ota-archive-header {
  text-align: center;
  margin-bottom: 48px;
}

.ota-eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--ota-gold);
  margin-bottom: 12px;
}

.ota-archive-header h1,
.ota-archive-header h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--ota-text);
  margin-bottom: 12px;
}

.ota-archive-header p {
  color: var(--ota-text-muted);
  font-size: 15px;
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

.ota-course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

/* ── Course Card ───────────────────────────────────── */
.ota-course-card {
  background: var(--ota-surface);
  border: 1px solid var(--ota-border2);
  border-radius: var(--ota-radius-lg);
  overflow: hidden;
  transition: var(--ota-transition);
  position: relative;
  text-decoration: none;
  display: block;
}

.ota-course-card:hover {
  border-color: var(--ota-border);
  transform: translateY(-3px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.ota-course-card__thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--ota-surface2);
}

.ota-course-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.ota-course-card:hover .ota-course-card__thumb img {
  transform: scale(1.04);
}

.ota-course-card__body {
  padding: 20px 22px;
}

.ota-course-card__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.ota-badge {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.ota-badge--level {
  background: rgba(201,168,76,0.12);
  color: var(--ota-gold);
  border: 1px solid rgba(201,168,76,0.2);
}

.ota-badge--free {
  background: rgba(45,160,80,0.12);
  color: #4DD87A;
  border: 1px solid rgba(45,160,80,0.2);
}

.ota-badge--paid {
  background: rgba(201,168,76,0.08);
  color: var(--ota-gold-light);
  border: 1px solid var(--ota-border);
}

.ota-course-card__title {
  font-size: 16px;
  font-weight: 500;
  color: var(--ota-text);
  line-height: 1.4;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.ota-course-card__excerpt {
  font-size: 13px;
  color: var(--ota-text-muted);
  line-height: 1.6;
  margin: 0 0 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ota-course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--ota-border2);
}

.ota-price {
  font-size: 18px;
  font-weight: 500;
  color: var(--ota-gold);
  letter-spacing: -0.02em;
}

.ota-price__currency {
  font-size: 12px;
  vertical-align: super;
  font-weight: 400;
  margin-right: 1px;
}

.ota-duration {
  font-size: 12px;
  color: var(--ota-text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ── Lesson Player ─────────────────────────────────── */
.ota-lesson-wrap {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  min-height: 600px;
}

.ota-lesson-main {
  background: var(--ota-dark);
}

.ota-lesson-video {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
}

.ota-lesson-video iframe,
.ota-lesson-video video {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
}

.ota-lesson-content {
  padding: 28px 32px;
}

.ota-lesson-title {
  font-size: 20px;
  font-weight: 500;
  color: var(--ota-text);
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.ota-lesson-body {
  font-size: 14px;
  color: var(--ota-text-muted);
  line-height: 1.75;
}

.ota-attachments {
  margin-top: 24px;
  padding: 20px;
  background: var(--ota-surface2);
  border-radius: var(--ota-radius);
  border: 1px solid var(--ota-border2);
}

.ota-attachments__title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ota-gold);
  margin: 0 0 12px;
}

.ota-attachment-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--ota-surface3);
  border-radius: 6px;
  margin-bottom: 8px;
  text-decoration: none;
  color: var(--ota-text);
  font-size: 13px;
  transition: var(--ota-transition);
  border: 1px solid transparent;
}

.ota-attachment-item:hover {
  border-color: var(--ota-border);
  background: var(--ota-surface);
}

.ota-attachment-icon {
  width: 28px;
  height: 28px;
  background: rgba(201,168,76,0.12);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ota-complete-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding: 12px 24px;
  background: var(--ota-gold);
  color: #000;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border: none;
  border-radius: var(--ota-radius);
  cursor: pointer;
  transition: var(--ota-transition);
}

.ota-complete-btn:hover { background: var(--ota-gold-light); }
.ota-complete-btn.is-complete { background: #2A7A4B; color: #fff; }

/* ── Sidebar / Curriculum ──────────────────────────── */
.ota-lesson-sidebar {
  background: var(--ota-surface);
  border-left: 1px solid var(--ota-border2);
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}

.ota-sidebar-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--ota-border2);
  position: sticky;
  top: 0;
  background: var(--ota-surface);
  z-index: 1;
}

.ota-progress-bar {
  height: 3px;
  background: var(--ota-surface3);
  border-radius: 2px;
  margin-bottom: 8px;
  overflow: hidden;
}

.ota-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ota-gold-dark), var(--ota-gold));
  border-radius: 2px;
  transition: width 0.5s ease;
}

.ota-progress-label {
  font-size: 11px;
  color: var(--ota-text-muted);
  letter-spacing: 0.05em;
}

.ota-progress-label span {
  color: var(--ota-gold);
  font-weight: 500;
}

.ota-section-title {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ota-text-muted);
  padding: 14px 20px 6px;
}

.ota-lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: 13px;
  color: var(--ota-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: var(--ota-transition);
}

.ota-lesson-item:hover {
  color: var(--ota-text);
  background: var(--ota-surface2);
}

.ota-lesson-item.is-active {
  color: var(--ota-gold);
  background: rgba(201,168,76,0.06);
  border-left-color: var(--ota-gold);
}

.ota-lesson-item.is-complete {
  color: #4DD87A;
}

.ota-lesson-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ota-lesson-item.is-complete .ota-lesson-check {
  background: #2A7A4B;
  border-color: #2A7A4B;
}

/* ── Dashboard ─────────────────────────────────────── */
.ota-dashboard {
  padding: 40px 0;
}

.ota-dashboard-greeting {
  margin-bottom: 40px;
}

.ota-dashboard-greeting h2 {
  font-size: 28px;
  font-weight: 400;
  color: var(--ota-text);
  letter-spacing: -0.02em;
}

.ota-dashboard-greeting p {
  color: var(--ota-text-muted);
  font-size: 14px;
  margin-top: 4px;
}

.ota-dashboard-courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.ota-dashboard-card {
  background: var(--ota-surface);
  border: 1px solid var(--ota-border2);
  border-radius: var(--ota-radius-lg);
  padding: 22px;
  text-decoration: none;
  display: block;
  transition: var(--ota-transition);
}

.ota-dashboard-card:hover {
  border-color: var(--ota-border);
}

.ota-dashboard-card__title {
  font-size: 15px;
  font-weight: 500;
  color: var(--ota-text);
  margin: 0 0 16px;
}

.ota-dashboard-card__progress-num {
  font-size: 24px;
  font-weight: 400;
  color: var(--ota-gold);
  margin-bottom: 6px;
}

/* ── Auth Forms ────────────────────────────────────── */
.ota-auth-wrap {
  max-width: 420px;
  margin: 60px auto;
  padding: 40px;
  background: var(--ota-surface);
  border: 1px solid var(--ota-border2);
  border-radius: var(--ota-radius-lg);
}

.ota-auth-logo {
  text-align: center;
  margin-bottom: 32px;
}

.ota-auth-logo span {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ota-gold);
}

.ota-auth-title {
  font-size: 22px;
  font-weight: 400;
  color: var(--ota-text);
  text-align: center;
  margin: 0 0 28px;
  letter-spacing: -0.01em;
}

.ota-form-group {
  margin-bottom: 16px;
}

.ota-form-group label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ota-text-muted);
  margin-bottom: 6px;
}

.ota-form-group input {
  width: 100%;
  padding: 11px 14px;
  background: var(--ota-surface2);
  border: 1px solid var(--ota-border2);
  border-radius: var(--ota-radius);
  color: var(--ota-text);
  font-size: 14px;
  transition: var(--ota-transition);
  outline: none;
  box-sizing: border-box;
}

.ota-form-group input:focus {
  border-color: var(--ota-border);
  background: var(--ota-surface3);
}

.ota-submit-btn {
  width: 100%;
  padding: 13px;
  background: var(--ota-gold);
  color: #000;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  border-radius: var(--ota-radius);
  cursor: pointer;
  margin-top: 8px;
  transition: var(--ota-transition);
}

.ota-submit-btn:hover { background: var(--ota-gold-light); }

.ota-error-msg {
  color: #E07070;
  font-size: 13px;
  text-align: center;
  margin-top: 12px;
  display: none;
}

.ota-auth-switch {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: var(--ota-text-muted);
}

.ota-auth-switch a { color: var(--ota-gold); text-decoration: none; }

/* ── Locked Notice ─────────────────────────────────── */
.ota-locked-notice {
  margin-top: 32px;
  padding: 32px;
  background: var(--ota-surface);
  border: 1px solid var(--ota-border);
  border-radius: var(--ota-radius-lg);
  text-align: center;
}

.ota-locked-notice h3 {
  font-size: 18px;
  font-weight: 400;
  color: var(--ota-text);
  margin: 0 0 8px;
}

.ota-locked-notice p {
  font-size: 14px;
  color: var(--ota-text-muted);
  margin: 0 0 20px;
}

.ota-buy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: var(--ota-gold);
  color: #000;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-radius: var(--ota-radius);
  transition: var(--ota-transition);
}

.ota-buy-btn:hover { background: var(--ota-gold-light); }

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .ota-lesson-wrap {
    grid-template-columns: 1fr;
  }
  .ota-lesson-sidebar {
    border-left: none;
    border-top: 1px solid var(--ota-border2);
    max-height: 400px;
  }
}