:root {
  --bg: #f4f4f6;
  --bg-elevated: #ffffff;
  --bg-soft: #e8ebf2;
  --fg: #111827;
  --fg-muted: #4b5563;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --border-subtle: #e5e7eb;
  --danger: #dc2626;
  --success: #16a34a;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --shadow-soft: 0 14px 40px rgba(15, 23, 42, 0.16);
}

:root[data-theme="dark"] {
  --bg: #020617;
  --bg-elevated: #020617;
  --bg-soft: #020617;
  --fg: #e5e7eb;
  --fg-muted: #9ca3af;
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.18);
  --border-subtle: #1e293b;
  --shadow-soft: 0 18px 60px rgba(15, 23, 42, 0.8);
}

/* Reset / base */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Text",
    "Segoe UI",
    sans-serif;
  color: var(--fg);
  background: radial-gradient(circle at top, var(--bg-soft), var(--bg)) fixed;
}

body {
  -webkit-font-smoothing: antialiased;
}

.app-root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  gap: 10px;
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to right,
    rgba(15, 23, 42, 0.97),
    rgba(15, 23, 42, 0.9)
  );
  color: #f9fafb;
  border-bottom: 1px solid rgba(148, 163, 184, 0.4);
}

.app-title-main {
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

.app-title-sub {
  display: block;
  font-size: 0.8rem;
  opacity: 0.75;
  margin-top: 2px;
}

.app-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Buttons & inputs */

.primary-button,
.secondary-button,
.icon-button,
.file-button {
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  padding: 8px 14px;
  cursor: pointer;
  transition:
    transform 0.1s ease,
    box-shadow 0.1s ease,
    background-color 0.12s ease,
    border-color 0.12s ease,
    color 0.12s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent), #22c55e);
  color: #f9fafb;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.4);
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(37, 99, 235, 0.55);
}

.secondary-button {
  background: var(--bg-soft);
  color: var(--fg);
  border-color: rgba(148, 163, 184, 0.7);
}

.secondary-button:disabled {
  opacity: 0.4;
  cursor: default;
}

.secondary-button:not(:disabled):hover {
  background: rgba(148, 163, 184, 0.15);
}

.icon-button {
  padding: 7px 9px;
  border-radius: 999px;
  border-color: rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.8);
  color: #e5e7eb;
}

.icon-button:hover {
  background: rgba(15, 23, 42, 0.95);
}

.file-button {
  position: relative;
  overflow: hidden;
  background: var(--bg-soft);
  color: var(--fg);
  border-color: rgba(148, 163, 184, 0.6);
  font-size: 0.85rem;
}

.file-button input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* Select */

.select-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: #e5e7eb;
}

.select-label {
  opacity: 0.75;
}

select {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  padding: 4px 10px;
  font: inherit;
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
}

/* Layout */

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 10px;
}

.main-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
  order: 1;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 10px;
  order: 2;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  background: linear-gradient(
    to bottom,
    rgba(15, 23, 42, 0.02),
    rgba(15, 23, 42, 0.03)
  );
}

/* Cards */

.card {
  border-radius: var(--radius-xl);
  background: radial-gradient(
    circle at top left,
    var(--bg-soft),
    var(--bg-elevated)
  );
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.2);
  padding: 12px 13px;
}

:root[data-theme="dark"] .card {
  background: radial-gradient(
    circle at top left,
    rgba(15, 23, 42, 0.95),
    rgba(15, 23, 42, 0.98)
  );
}

.card-task {
  padding: 14px;
}

.card-map {
  padding: 10px;
}

.card-end {
  text-align: center;
  padding: 40px 16px;
}

/* Status */

.card-status .status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--fg-muted);
}

.card-status .status-row + .status-row {
  margin-top: 4px;
}

.card-status span:last-child {
  font-weight: 600;
  color: var(--fg);
}

/* File & codes */

.card-file h2,
.card-codes h2 {
  font-size: 0.95rem;
  margin: 0 0 6px;
}

.file-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.hint-text {
  margin: 0;
  font-size: 0.78rem;
  color: var(--fg-muted);
}

.code-row {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

#unlock-code-input {
  flex: 1;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  padding: 8px 10px;
  font: inherit;
  text-align: center;
  background: var(--bg-elevated);
  color: var(--fg);
}

/* Task view */

.tab-bar {
  display: inline-flex;
  border-radius: 999px;
  padding: 4px;
  background: rgba(15, 23, 42, 0.08);
  margin-bottom: 8px;
}

:root[data-theme="dark"] .tab-bar {
  background: rgba(15, 23, 42, 0.7);
}

.tab {
  flex: 1;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--fg-muted);
  font-size: 0.8rem;
  padding: 6px 10px;
  cursor: pointer;
}

.tab.active {
  background: var(--bg-elevated);
  color: var(--fg);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.22);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.task-header h1 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.task-short {
  margin: 0;
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.task-stage {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed rgba(148, 163, 184, 0.5);
}

.stage-title {
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.stage-locked {
  padding: 8px 10px;
  border-radius: 12px;
  background: var(--accent-soft);
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.stage-puzzle-content.hidden {
  display: none;
}

.media-gallery {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}

.media-gallery img,
.media-gallery video {
  width: 100%;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.5);
}

.media-caption {
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin-top: 2px;
}

.answer-actions {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
}

/* Feedback banner */

.feedback-text {
  font-size: 0.9rem;
  min-height: 1.6em;
  border-radius: 999px;
  padding: 8px 12px;
  margin-top: 4px;
  background: transparent;
  transform-origin: left center;
  transform: scale(0.96);
  opacity: 0;
  transition:
    opacity 0.15s ease,
    transform 0.15s ease,
    background-color 0.15s ease,
    color 0.15s ease;
}

.feedback-text.success,
.feedback-text.error {
  opacity: 1;
  transform: scale(1);
}

.feedback-text.success {
  background: rgba(34, 197, 94, 0.18);
  color: var(--success);
}

.feedback-text.error {
  background: rgba(248, 113, 113, 0.2);
  color: var(--danger);
}

.task-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

/* Answer controls */

.answer-block {
  padding: 8px 10px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px dashed rgba(148, 163, 184, 0.7);
  font-size: 0.85rem;
}

:root[data-theme="dark"] .answer-block {
  background: rgba(15, 23, 42, 0.7);
  border-color: rgba(148, 163, 184, 0.6);
}

.answer-block h3 {
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.answer-block input[type="text"],
.answer-block input[type="number"],
.answer-block select {
  width: 100%;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.8);
  padding: 7px 10px;
  font: inherit;
  background: var(--bg-elevated);
  color: var(--fg);
}

.order-list {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
}

.order-item {
  padding: 6px 8px;
  margin-bottom: 4px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.7);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: grab;
}

.order-item-handle {
  font-size: 1rem;
  opacity: 0.6;
}

.match-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-size: 0.82rem;
}

.match-row span {
  flex: 0 0 40%;
}

.sequence-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-size: 0.82rem;
}

/* Map */

#map-container {
  position: relative;
  height: 60vh;
  max-height: 460px;
  min-height: 260px;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.5);
}

#map {
  width: 100%;
  height: 100%;
}

/* Summary */

.card-summary {
  max-height: 60vh;
  overflow: auto;
}

#summary-content {
  font-size: 0.82rem;
}

.summary-task {
  padding: 6px 0;
  border-bottom: 1px dashed rgba(148, 163, 184, 0.4);
}

.summary-task:last-child {
  border-bottom: none;
}

/* End */

.card-end h1 {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.end-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.end-image {
  display: block;
  max-width: 100%;
  margin: 14px auto 0;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}

/* Misc */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

/* Desktop layout */

@media (min-width: 900px) {
  .app-main {
    flex-direction: row;
    align-items: stretch;
    padding: 14px 18px;
    gap: 14px;
  }

  .sidebar {
    flex: 0 0 260px;
    order: 1;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    background: transparent;
  }

  .main-content {
    flex: 1;
    order: 2;
  }

  .card-task {
    height: 100%;
  }
}