/* ════════ MAIN PAGE ════════ */
.start-page {
  min-height: 100vh;
  padding: 100px 20px 80px;
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.start-page::before {
  content: '';
  position: fixed;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 229, 255, .05), transparent);
  top: 5%;
  right: 5%;
  border-radius: 50%;
  pointer-events: none;
}

.start-wrapper {
  width: 100%;
  max-width: 700px;
}

/* Course header */
.course-header {
  margin-bottom: 36px;
  animation: fadeUp .5s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

.course-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: rgba(0, 229, 255, .06);
  border: 1px solid rgba(0, 229, 255, .2);
  border-radius: 100px;
  font-family: 'Space Mono', monospace;
  font-size: .65rem;
  letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 14px;
}

.course-title {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: -.03em;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.2;
}

.course-title span {
  color: var(--accent);
}

.course-desc {
  color: var(--text-muted);
  font-size: .92rem;
  max-width: 500px;
}

/* Progress Steps */
.progress-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  box-shadow: 0 24px 80px var(--shadow);
  position: relative;
  overflow: hidden;
  animation: fadeUp .5s .1s ease both;
}

.progress-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .4;
}

/* Step indicator row */
.steps-indicator {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 32px;
}

.step-dot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-family: 'Space Mono', monospace;
  font-size: .72rem;
  font-weight: 700;
  border: 2px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  transition: all .4s;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.step-dot.active {
  border-color: var(--accent);
  background: rgba(0, 229, 255, .1);
  color: var(--accent);
  box-shadow: 0 0 16px rgba(0, 229, 255, .2);
}

.step-dot.done {
  border-color: var(--accent4);
  background: rgba(168, 255, 120, .1);
  color: var(--accent4);
}

.step-dot.done::after {
  content: '✓';
  font-size: .8rem;
}

.step-dot.done .step-num {
  display: none;
}

.step-connector {
  flex: 1;
  height: 2px;
  background: var(--border);
  transition: background .4s;
  position: relative;
}

.step-connector.done {
  background: var(--accent);
}

.step-connector::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--accent));
  opacity: 0;
  transition: opacity .6s;
}

.step-connector.active::after {
  opacity: 1;
}

.steps-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 8px;
}

.step-label {
  font-size: .75rem;
  color: var(--text-muted);
  font-family: 'Space Mono', monospace;
  letter-spacing: .02em;
  text-align: center;
  flex: 1;
  transition: color .3s;
}

.step-label.active {
  color: var(--accent);
}

.step-label.done {
  color: var(--accent4);
}

/* Progress bar */
.progress-bar-wrap {
  background: var(--surface2);
  border-radius: 100px;
  height: 6px;
  margin-bottom: 36px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-bar-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  box-shadow: 0 0 10px var(--accent);
  transition: width .8s cubic-bezier(.34, 1.56, .64, 1);
  width: 0%;
}

/* Step panels */
.step-panel {
  display: none;
}

.step-panel.active {
  display: block;
  animation: fadeUp .4s ease both;
}

/* Step 1 – Level selection */
.step-heading {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 6px;
  color: var(--text);
}

.step-sub {
  color: var(--text-muted);
  font-size: .88rem;
  margin-bottom: 24px;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.level-card {
  padding: 20px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg2);
  cursor: pointer;
  transition: all .25s;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.level-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .3s;
}

.level-card.level-1::before {
  background: radial-gradient(circle at 50% 0%, rgba(168, 255, 120, .06), transparent);
}

.level-card.level-2::before {
  background: radial-gradient(circle at 50% 0%, rgba(0, 229, 255, .06), transparent);
}

.level-card.level-3::before {
  background: radial-gradient(circle at 50% 0%, rgba(123, 47, 255, .06), transparent);
}

.level-card:hover {
  transform: translateY(-3px);
}

.level-card.level-1:hover {
  border-color: rgba(168, 255, 120, .4);
  box-shadow: 0 8px 24px rgba(168, 255, 120, .1);
}

.level-card.level-2:hover {
  border-color: rgba(0, 229, 255, .4);
  box-shadow: 0 8px 24px rgba(0, 229, 255, .1);
}

.level-card.level-3:hover {
  border-color: rgba(123, 47, 255, .4);
  box-shadow: 0 8px 24px rgba(123, 47, 255, .1);
}

.level-card.selected.level-1 {
  border-color: var(--accent4);
  background: rgba(168, 255, 120, .06);
  box-shadow: 0 0 0 3px rgba(168, 255, 120, .1);
}

.level-card.selected.level-2 {
  border-color: var(--accent);
  background: rgba(0, 229, 255, .06);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, .1);
}

.level-card.selected.level-3 {
  border-color: var(--accent2);
  background: rgba(123, 47, 255, .06);
  box-shadow: 0 0 0 3px rgba(123, 47, 255, .1);
}

.level-card.selected::before {
  opacity: 1;
}

.level-icon {
  font-size: 2rem;
  margin-bottom: 10px;
  display: block;
}

.level-name {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: .85rem;
  margin-bottom: 4px;
  color: var(--text);
}

.level-card.level-1 .level-name {
  color: var(--accent4);
}

.level-card.level-2 .level-name {
  color: var(--accent);
}

.level-card.level-3 .level-name {
  color: #a78bfa;
}

.level-desc {
  font-size: .75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Step 2 – Try or register */
.action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 8px;
}

.action-card {
  padding: 28px 22px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg2);
  cursor: pointer;
  transition: all .25s;
  text-align: center;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.action-card.try:hover {
  border-color: rgba(0, 229, 255, .4);
  background: rgba(0, 229, 255, .04);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 229, 255, .08);
}

.action-card.register {
  border-color: rgba(123, 47, 255, .2);
}

.action-card.register:hover {
  border-color: rgba(123, 47, 255, .5);
  background: rgba(123, 47, 255, .04);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(123, 47, 255, .1);
}

.action-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.action-card.try .action-icon {
  background: rgba(0, 229, 255, .08);
  border: 1px solid rgba(0, 229, 255, .2);
  color: var(--accent);
}

.action-card.register .action-icon {
  background: rgba(123, 47, 255, .08);
  border: 1px solid rgba(123, 47, 255, .2);
  color: #a78bfa;
}

.action-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: .95rem;
  color: var(--text);
}

.action-desc {
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Buttons */
.btn-primary {
  padding: 13px 28px;
  background: var(--accent);
  color: #000;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: .88rem;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all .25s;
  letter-spacing: .02em;
  box-shadow: 0 0 28px rgba(0, 229, 255, .2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 45px rgba(0, 229, 255, .35);
}

.btn-primary:disabled {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}

.btn-ghost {
  padding: 13px 28px;
  background: transparent;
  color: var(--text-muted);
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: .88rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all .25s;
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

.step-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* RESPONSIVE */
@media(max-width:900px) {
  .progress-card {
    padding: 24px 20px;
  }

  .level-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .action-grid {
    grid-template-columns: 1fr;
  }
}

/* RESPONSIVE */
@media(max-width:600px) {
  .step-nav {
    flex-direction: column;
    gap: 10px;
  }

  .step-nav .btn-primary,
  .step-nav .btn-ghost {
    width: 100%;
    justify-content: center;
  }
}

@media(max-width:480px) {
  .course-title {
    font-size: 1.5rem;
  }
}