:root {
  --bg-top: #f6f8fd;
  --bg-bottom: #f9f4eb;
  --card: rgba(255, 255, 255, 0.78);
  --card-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(115, 142, 191, 0.24);
  --text: #39424f;
  --muted: #8d96a4;
  --accent: #4894ff;
  --accent-strong: #2374e2;
  --success: #73bc21;
  --success-strong: #5da10f;
  --shadow: 0 24px 80px rgba(95, 110, 134, 0.16);
  --shadow-soft: 0 16px 40px rgba(124, 138, 161, 0.16);
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 234, 199, 0.66), transparent 26%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
}

button,
input {
  font: inherit;
}

.page-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  padding: 24px;
}

.ambient {
  position: absolute;
  border-radius: 999px;
  filter: blur(24px);
  opacity: 0.8;
  pointer-events: none;
}

.ambient-left {
  top: 72px;
  left: -50px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255, 212, 138, 0.42), transparent 70%);
}

.ambient-right {
  right: -40px;
  bottom: 120px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(120, 180, 255, 0.28), transparent 68%);
}

.app-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(340px, 0.95fr);
  gap: 20px;
  max-width: 1500px;
  margin: 0 auto;
  min-height: calc(100vh - 48px);
}

.preview-panel,
.control-panel {
  position: relative;
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.preview-panel {
  padding: 28px 28px 20px;
  display: flex;
  flex-direction: column;
}

.control-panel {
  background: var(--card-strong);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 26px;
}

.panel-head {
  margin-bottom: 22px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(72, 148, 255, 0.12);
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.panel-head h1 {
  margin: 14px 0 10px;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.05;
}

.panel-head p {
  margin: 0;
  max-width: 680px;
  color: #6c7685;
  font-size: 16px;
  line-height: 1.8;
}

.preview-frame {
  position: relative;
  flex: 1;
  min-height: 420px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 30px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(245, 248, 255, 0.9)),
    linear-gradient(135deg, rgba(255, 214, 147, 0.16), transparent 42%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.preview-frame::after {
  content: "";
  position: absolute;
  inset: auto 7% 6% 7%;
  height: 40px;
  background: radial-gradient(circle, rgba(0, 0, 0, 0.22), transparent 64%);
  filter: blur(16px);
  z-index: 0;
}

.preview-empty {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  gap: 10px;
  text-align: center;
  padding: 32px;
}

.empty-badge {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(115, 188, 33, 0.14);
  color: var(--success-strong);
  font-size: 13px;
  font-weight: 700;
}

.preview-empty h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
}

.preview-empty p {
  margin: 0;
  max-width: 420px;
  color: var(--muted);
  line-height: 1.7;
}

#sourceImage {
  position: relative;
  z-index: 1;
  max-width: min(92%, 100%);
  max-height: min(84vh, 700px);
  object-fit: contain;
  border-radius: 22px;
  box-shadow: 0 22px 48px rgba(66, 76, 97, 0.18);
}

.grid-overlay,
.tile-markers {
  position: absolute;
  z-index: 2;
  pointer-events: none;
}

.grid-line {
  position: absolute;
  background: repeating-linear-gradient(
    90deg,
    rgba(52, 217, 255, 0.92),
    rgba(52, 217, 255, 0.92) 10px,
    rgba(26, 61, 77, 0.52) 10px,
    rgba(26, 61, 77, 0.52) 16px
  );
  box-shadow: 0 0 0 2px rgba(132, 244, 255, 0.18);
}

.grid-line.vertical {
  top: 0;
  width: 4px;
  height: 100%;
  transform: translateX(-50%);
}

.grid-line.horizontal {
  left: 0;
  width: 100%;
  height: 4px;
  transform: translateY(-50%);
}

.marker {
  position: absolute;
  width: clamp(46px, 5vw, 56px);
  height: clamp(46px, 5vw, 56px);
  display: grid;
  place-items: center;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.78);
  background: rgba(29, 31, 36, 0.86);
  color: #fff;
  font-size: clamp(22px, 2vw, 30px);
  font-weight: 800;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

.meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.meta-pill {
  min-width: 170px;
  padding: 14px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(115, 142, 191, 0.14);
  box-shadow: var(--shadow-soft);
}

.meta-label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.meta-pill strong {
  font-size: 16px;
}

.tool-link {
  color: inherit;
  text-decoration: none;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.tool-link:hover {
  transform: translateY(-2px);
  border-color: rgba(115, 188, 33, 0.5);
  box-shadow: 0 18px 36px rgba(115, 188, 33, 0.18);
}

.tool-link strong {
  color: var(--success-strong);
}

.upload-box {
  position: relative;
  display: grid;
  place-items: center;
  gap: 22px;
  min-height: 360px;
  padding: 28px;
  border-radius: 26px;
  border: 2px dashed rgba(72, 148, 255, 0.32);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(249, 251, 255, 0.8)),
    linear-gradient(140deg, rgba(72, 148, 255, 0.07), rgba(115, 188, 33, 0.08));
  text-align: center;
  cursor: pointer;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.upload-box:hover,
.upload-box.is-dragover {
  transform: translateY(-2px);
  border-color: rgba(72, 148, 255, 0.82);
  box-shadow: 0 18px 44px rgba(72, 148, 255, 0.16);
}

.upload-icon {
  color: #a8adb7;
}

.upload-icon svg {
  width: 88px;
  height: 88px;
}

.upload-copy strong {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(24px, 2vw, 28px);
  color: #666d79;
  font-weight: 700;
}

.upload-copy span {
  color: var(--accent);
}

.upload-copy p {
  margin: 0;
  color: #969eaa;
  font-size: 18px;
}

.field-group {
  display: grid;
  gap: 18px;
}

.field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: clamp(22px, 1.8vw, 30px);
  font-weight: 700;
  color: #5c6470;
}

.field input {
  width: 210px;
  padding: 17px 20px;
  border-radius: 14px;
  border: 2px solid rgba(69, 88, 121, 0.28);
  background: #fff;
  font-size: 26px;
  color: #5d6673;
  box-shadow: inset 0 1px 2px rgba(20, 20, 20, 0.06);
}

.field input:focus {
  outline: none;
  border-color: rgba(72, 148, 255, 0.9);
  box-shadow: 0 0 0 5px rgba(72, 148, 255, 0.12);
}

.helper-text {
  margin: -2px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.action-row {
  display: flex;
  justify-content: flex-end;
  gap: 16px;
  margin-top: auto;
}

.ghost-btn,
.primary-btn {
  border: none;
  border-radius: 999px;
  min-width: 148px;
  padding: 15px 28px;
  font-size: 20px;
  font-weight: 800;
  cursor: pointer;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    opacity 160ms ease,
    background 160ms ease;
}

.ghost-btn {
  color: #fff;
  background: linear-gradient(180deg, #aeb0ac, #8f918d);
  box-shadow: 0 10px 24px rgba(113, 117, 110, 0.26);
}

.primary-btn {
  color: #fff;
  background: linear-gradient(180deg, var(--success), var(--success-strong));
  box-shadow: 0 14px 28px rgba(115, 188, 33, 0.28);
}

.ghost-btn:hover,
.primary-btn:hover:not(:disabled) {
  transform: translateY(-2px);
}

.primary-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

@media (max-width: 1180px) {
  .app-card {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    min-height: 56vh;
  }

  .control-panel {
    gap: 22px;
  }

  .upload-box {
    min-height: 260px;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 14px;
  }

  .preview-panel,
  .control-panel {
    border-radius: 24px;
  }

  .preview-panel,
  .control-panel {
    padding: 18px;
  }

  .preview-frame {
    min-height: 320px;
    border-radius: 22px;
  }

  .upload-copy strong {
    font-size: 22px;
  }

  .upload-copy p {
    font-size: 15px;
  }

  .field {
    flex-direction: column;
    align-items: stretch;
    font-size: 18px;
  }

  .field input {
    width: 100%;
    font-size: 22px;
  }

  .action-row {
    flex-direction: column;
  }

  .ghost-btn,
  .primary-btn {
    width: 100%;
  }

  #sourceImage {
    max-width: 94%;
    max-height: 60vh;
  }
}