body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
}
body {
  background: linear-gradient(
    135deg,
    var(--bg),
    var(--surface) 45%,
    var(--surface-alt)
  );
}

.container {
  max-width: 1450px;
  margin: 0 auto;
  padding: 20px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  gap: 18px;
  margin-bottom: 18px;
}

.hero-card,
.score-card,
.panel {
  background: var(--surface);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 22px;
  padding: 20px;
  box-shadow: var(--shadow);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.title-row {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
}

.icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: rgba(56, 189, 248, 0.12);
  border-radius: 16px;
  font-size: 24px;
}

.chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 14px 0;
}

.chip {
  background: rgba(148, 163, 184, 0.1);
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
}

.progress-wrap {
  margin-top: 12px;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 14px;
  margin-bottom: 8px;
}

.progress-bar {
  width: 100%;
  height: 14px;
  background: rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--success), var(--accent));
  transition: width 0.25s ease;
}

.score-list {
  display: grid;
  gap: 10px;
}

.score-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 16px;
  padding: 12px;
}

.score-status {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.pending {
  background: rgba(148, 163, 184, 0.14);
  color: var(--muted);
}
.solved {
  background: rgba(34, 197, 94, 0.16);
  color: var(--success);
}

.challenge-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.tab {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  color: var(--text);
  padding: 14px;
  cursor: pointer;
  text-align: left;
  transition: 0.2s ease;
}

.tab:hover,
.tab.active {
  border-color: rgba(56, 189, 248, 0.9);
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(14, 165, 233, 0.15);
}

.main {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.panel-head {
  flex-wrap: wrap;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
  margin-bottom: 16px;
}

.badge {
  display: inline-block;
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.website-card {
  background: var(--surface-alt);
  color: var(--text);
  border-radius: 20px;
  border: 1px solid var(--border);
  padding: 18px;
}

.mini-bar {
  flex-wrap: wrap;
  gap: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 14px;
  background: var(--surface);
  color: var(--text);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.row-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

button {
  border: none;
  border-radius: 14px;
  padding: 11px 15px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
}

.primary {
  background: var(--accent);
  color: var(--on-accent);
}
.secondary {
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
}
.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.25);
}
.result-box {
  margin-top: 14px;
  border-radius: 14px;
  padding: 14px;
  font-size: 14px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
}

.codebox {
  width: 100%;
  min-height: 460px;
  max-width: 100%;
  background: var(--code-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}

.code-note {
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--muted);
  border-radius: 14px;
  padding: 12px;
  font-size: 13px;
  margin-bottom: 12px;
}

.hint-box {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.28);
  color: var(--warning);
  border-radius: 14px;
  padding: 14px;
  margin-top: 14px;
}

.attempts {
  font-size: 13px;
  color: var(--muted);
  margin-top: 8px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 18px;
  z-index: 500;
}

.modal.show {
  display: flex;
}

.modal-card {
  width: min(460px, 100%);
  background: var(--surface);
  color: var(--text);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.24);
}

.modal-card h3 {
  margin-bottom: 8px;
}

.muted {
  color: var(--muted);
}

.footer-note {
  margin-top: 18px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.preview-box {
  border: 1px dashed var(--border);
  border-radius: 14px;
  padding: 14px;
  min-height: 70px;
  background: var(--surface);
}

.safe-text {
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 1100px) {
  .hero,
  .main {
    grid-template-columns: 1fr;
  }
  .challenge-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .challenge-tabs,
  .row-2 {
    grid-template-columns: 1fr;
  }
  .btn-row {
    flex-direction: column;
  }
  .btn-row button {
    width: 100%;
  }
}

input[type="checkbox"] {
  width: auto;
  accent-color: var(--accent);
}
.main > * {
  min-width: 0;
}
.notice {
  margin: 20px;
}