:root {
  --bg: #082346;
  --card: #123d73;
  --card-soft: #184984;
  --text: #e9f4ff;
  --muted: #a7c2e1;
  --accent: #2bf58a;
  --accent-strong: #00c96b;
  --danger: #f0527b;
  --shadow: 0 12px 26px rgba(2, 12, 30, 0.34);
  --grid-empty: #d6e3ff;
  --grid-filled: #6e89e2;
  --grid-new: #ff9f2e;
  --option-mark: #f84d5f;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "SF Pro Display", "Helvetica Neue", sans-serif;
  background: radial-gradient(circle at top, #202c39 0%, var(--bg) 70%);
  color: var(--text);
  min-height: 100%;
}

.app {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: max(14px, env(safe-area-inset-top)) 14px
    max(24px, env(safe-area-inset-bottom));
  display: grid;
  gap: 14px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.25rem, 4.6vw, 1.8rem);
  letter-spacing: 0.02em;
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  background: linear-gradient(
    180deg,
    rgba(19, 66, 121, 0.95),
    rgba(13, 47, 92, 0.96)
  );
  border: 1px solid rgba(132, 180, 234, 0.32);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.hidden {
  display: none;
}

.btn-secondary {
  width: 100%;
  border: 1px solid #729fd1;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.95rem;
  font-weight: 700;
  color: #dff0ff;
  background: rgba(14, 50, 94, 0.9);
  margin-bottom: 10px;
}

.btn-secondary:disabled {
  opacity: 0.55;
}

.upload-zone {
  border: 2px dashed rgba(151, 197, 246, 0.55);
  background: rgba(10, 34, 65, 0.65);
  border-radius: 14px;
  padding: 18px 14px;
  display: block;
  text-align: center;
  cursor: pointer;
}

.upload-zone.active {
  border-color: #2ae28a;
  background: rgba(11, 71, 70, 0.42);
}

.hidden-input {
  display: none;
}

.upload-title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
}

.upload-subtitle {
  display: block;
  color: var(--muted);
  margin-top: 6px;
  font-size: 0.85rem;
}

.btn-primary {
  margin-top: 12px;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 1rem;
  font-weight: 700;
  color: #052033;
  background: linear-gradient(180deg, #4affad, var(--accent-strong));
}

.btn-primary:disabled {
  opacity: 0.45;
}

.hint {
  margin: 10px 0 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.api-key-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}

.api-key-input {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  border: 1px solid rgba(145, 183, 226, 0.45);
  border-radius: 12px;
  background: rgba(8, 28, 53, 0.85);
  color: #e8f3ff;
  padding: 10px 12px;
  font-size: 0.95rem;
}

.api-btn {
  margin-bottom: 0;
  width: auto;
  white-space: nowrap;
}

.shortcut-title {
  margin-top: 12px;
}

.shortcut-steps {
  margin: 0;
  padding-left: 18px;
  color: #d8ecff;
  font-size: 0.84rem;
  line-height: 1.45;
}

.shortcut-link {
  text-decoration: none;
  color: #7af5a4;
  font-weight: 700;
}

.shortcut-sublist {
  margin: 6px 0 0;
  padding-left: 18px;
  list-style: disc;
}

.api-settings-box {
  border: 1px solid rgba(145, 183, 226, 0.32);
  border-radius: 12px;
  padding: 10px;
  background: rgba(8, 31, 58, 0.45);
  margin-bottom: 10px;
}

.api-settings-box h3 {
  margin: 0 0 8px;
  font-size: 0.92rem;
}

.api-toggle-row {
  margin-bottom: 8px;
  padding: 8px 10px;
  border: 1px solid rgba(120, 168, 218, 0.35);
  background: rgba(10, 37, 70, 0.55);
}

.api-settings-box.disabled .api-key-row,
.api-settings-box.disabled .shortcut-title,
.api-settings-box.disabled .shortcut-steps {
  opacity: 0.45;
  pointer-events: none;
}

.api-banner {
  border-color: rgba(43, 245, 138, 0.6);
  background: linear-gradient(
    180deg,
    rgba(17, 87, 71, 0.9),
    rgba(10, 62, 54, 0.9)
  );
  color: #d8ffe9;
  font-size: 0.92rem;
  font-weight: 700;
  word-break: break-all;
}

.api-future-box {
  border: 1px dashed rgba(120, 168, 218, 0.45);
  border-radius: 12px;
  padding: 10px;
  margin: 4px 0 8px;
}

.api-future-box h3 {
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.guide-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 8px;
}

.guide-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #dff4ff;
  border: 1px solid rgba(120, 168, 218, 0.55);
  border-radius: 10px;
  background: rgba(12, 44, 82, 0.85);
  padding: 8px 10px;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
}

.guide-btn:hover {
  border-color: rgba(43, 245, 138, 0.75);
  color: #e8fff5;
}

.guide-media {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(120, 168, 218, 0.35);
}

.guide-media img {
  display: block;
  width: 100%;
  height: auto;
}

h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.preview-shell {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  min-height: 240px;
  border: 1px solid rgba(137, 172, 214, 0.35);
  background: rgba(7, 23, 45, 0.82);
}

#previewImage {
  width: 100%;
  height: auto;
  display: none;
}

.preview-empty {
  min-height: 240px;
  display: grid;
  place-items: center;
  color: var(--muted);
}

.debug-crops {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.debug-crop-item {
  border: 1px solid rgba(137, 172, 214, 0.35);
  border-radius: 10px;
  padding: 6px;
  background: rgba(7, 23, 45, 0.72);
}

.debug-crop-title {
  font-size: 0.75rem;
  color: #c8e4ff;
  margin-bottom: 6px;
  font-weight: 700;
}

.debug-crop-item canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  background: #0b1f3d;
}

@media (max-width: 640px) {
  .debug-crops {
    grid-template-columns: 1fr;
  }
}

.status {
  display: inline-block;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 700;
}

.status.idle {
  background: rgba(168, 199, 234, 0.2);
  color: #d7e9ff;
}

.status.running {
  background: rgba(56, 219, 138, 0.2);
  color: #a8ffd1;
}

.status.error {
  background: rgba(240, 82, 123, 0.2);
  color: #ffabc1;
}

.solution-view {
  display: grid;
  gap: 10px;
}

.solution-view.empty {
  color: var(--muted);
}

.steps-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.step-card {
  background: rgba(7, 28, 57, 0.5);
  border: 1px solid rgba(145, 183, 226, 0.42);
  border-radius: 12px;
  padding: 8px;
}

.step-title {
  font-size: 0.78rem;
  color: #d3e8ff;
  margin-bottom: 8px;
  font-weight: 700;
}

.done-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
}

.done-step {
  color: #ff8a94;
}

.done-skull {
  font-size: 1.4rem;
  line-height: 1;
}

.done-text {
  margin-top: 4px;
  font-size: 0.88rem;
  font-weight: 900;
  color: #ff4f63;
  line-height: 1.2;
}

.grid8 {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  background: #edf4ff;
  padding: 4px;
  border-radius: 8px;
  overflow: hidden;
}

.grid8.mini {
  max-width: 180px;
}

.cell {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 2px;
  background: var(--grid-empty);
}

.cell.filled {
  background: var(--grid-filled);
}

.cell.new {
  background: var(--grid-new);
}

.cell.clear-target {
  box-shadow:
    inset 0 0 0 1px #05070c,
    0 0 0 0.5px rgba(0, 0, 0, 0.55);
}

.step-meta {
  margin-top: 8px;
  font-size: 0.72rem;
  color: #b9d7f6;
}

.powerup-view {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.powerup-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffe98f;
}

.powerup-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.powerup-item {
  background: rgba(7, 28, 57, 0.5);
  border: 1px solid rgba(145, 183, 226, 0.42);
  border-radius: 10px;
  padding: 8px;
  font-size: 0.78rem;
}

.powerup-item.visual {
  display: grid;
  gap: 8px;
}

.powerup-head {
  font-weight: 800;
  color: #c7e7ff;
  font-size: 0.82rem;
}

.powerup-meta {
  font-size: 0.75rem;
  color: #a9c9ea;
}

.powerup-item strong {
  color: #9affc9;
}

#resultText {
  margin: 12px 0 0;
  background: rgba(4, 19, 40, 0.7);
  border: 1px solid rgba(145, 183, 226, 0.32);
  border-radius: 10px;
  padding: 10px;
  min-height: 140px;
  max-height: 360px;
  overflow: auto;
  color: #eaf4ff;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.8rem;
}

@media (min-width: 768px) {
  .app {
    padding: 20px;
    gap: 16px;
  }

  .card {
    padding: 16px;
  }
}

.cell.power-rainbow {
  background: linear-gradient(
    135deg,
    #ff3b30 0%,
    #ff9500 20%,
    #ffd60a 40%,
    #34c759 60%,
    #0a84ff 80%,
    #af52de 100%
  );
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.7),
    0 0 0 1px rgba(0, 0, 0, 0.45);
}

.cell.power-plus {
  background: repeating-linear-gradient(
    45deg,
    #ffd54a 0px,
    #ffd54a 7px,
    #ff9f1a 7px,
    #ff9f1a 11px
  );
  box-shadow:
    inset 0 0 0 2px #d46b00,
    0 0 0 1px rgba(0, 0, 0, 0.35);
}

.cell.power-remove {
  background: #ff4d67;
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.7),
    0 0 0 1px rgba(0, 0, 0, 0.35);
}

/* ── Settings Panel ─────────────────────────────── */
.settings-card {
  padding: 10px 14px;
  overflow: hidden;
}

.btn-settings-toggle {
  width: 100%;
  background: rgba(14, 50, 94, 0.7);
  border: 1px solid rgba(100, 160, 220, 0.4);
  border-radius: 10px;
  color: #cce4ff;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 12px;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition:
    background 0.2s,
    border-color 0.2s;
}

.btn-settings-toggle.open {
  border-color: rgba(43, 245, 138, 0.5);
  background: rgba(20, 70, 130, 0.9);
  color: #e8fff5;
}

.btn-settings-toggle:hover {
  background: rgba(20, 64, 120, 0.85);
}

.btn-settings-toggle::after {
  content: "▾";
  margin-left: auto;
  font-size: 0.9rem;
  transition: transform 0.2s;
}

.btn-settings-toggle.open::after {
  transform: rotate(180deg);
}

.settings-panel {
  display: none;
}

.settings-panel:not(.hidden) {
  display: grid;
  gap: 6px;
  margin-top: 10px;
  animation: slideDown 0.2s ease;
}

.settings-note {
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0 0 6px;
  font-style: italic;
}

.setting-row {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 8px;
  transition: background 0.15s;
}

.setting-row:hover {
  background: rgba(255, 255, 255, 0.05);
}

.setting-row input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
  flex-shrink: 0;
  cursor: pointer;
}

.setting-label {
  flex: 1;
  font-size: 0.88rem;
  color: #d8eeff;
  user-select: none;
}

.help-btn {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid rgba(130, 180, 230, 0.5);
  background: rgba(20, 60, 110, 0.7);
  color: #a7cbef;
  font-size: 0.72rem;
  font-weight: 800;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.15s,
    color 0.15s;
}

.help-btn:hover,
.help-btn.active {
  background: var(--accent-strong);
  color: #fff;
  border-color: var(--accent-strong);
}

.tooltip-box {
  background: rgba(5, 25, 55, 0.95);
  border: 1px solid rgba(80, 160, 230, 0.45);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 0.82rem;
  color: #c8e4ff;
  line-height: 1.55;
  margin: 0 4px;
  animation: fadeIn 0.18s ease;
}

.tooltip-box strong {
  color: #5df5b5;
}

.sub-setting {
  display: none;
}

.sub-setting:not(.hidden) {
  display: block;
  padding-left: 28px;
  border-left: 2px solid rgba(90, 160, 230, 0.25);
  margin-left: 8px;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

a#personalLink {
  text-decoration: none;
  color: #66c866;
}