:root {
  --bg-top: #f4f7fb;
  --bg-bottom: #dfe8f5;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-border: rgba(255, 255, 255, 0.68);
  --ink: #152033;
  --muted: #5f6d83;
  --line: rgba(21, 32, 51, 0.1);
  --shadow: 0 24px 60px rgba(41, 58, 90, 0.16);
  --red: #ea4335;
  --blue: #4285f4;
  --yellow: #fbbc05;
  --green: #34a853;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(234, 67, 53, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(66, 133, 244, 0.18), transparent 26%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.page {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 56px 0 40px;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue);
}

.hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.hero-copy {
  margin: 18px 0 0;
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
}

.panel {
  backdrop-filter: blur(18px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.controls {
  padding: 28px;
}

.preview-panel {
  padding: 22px;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.panel-copy {
  margin: 0 0 22px;
  color: var(--muted);
  line-height: 1.6;
}

.upload-zone {
  display: grid;
  gap: 8px;
  padding: 28px 22px;
  border: 1.5px dashed rgba(66, 133, 244, 0.38);
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(66, 133, 244, 0.07), rgba(52, 168, 83, 0.05)),
    #fff;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.upload-zone:hover {
  transform: translateY(-1px);
  border-color: rgba(66, 133, 244, 0.62);
  box-shadow: 0 14px 30px rgba(66, 133, 244, 0.12);
}

.upload-zone input {
  display: none;
}

.upload-title {
  font-size: 1.05rem;
  font-weight: 800;
}

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

.actions {
  margin-top: 18px;
}

.primary-button {
  width: 100%;
  border: 0;
  border-radius: 18px;
  padding: 15px 18px;
  font: inherit;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(90deg, var(--red), var(--blue));
  cursor: pointer;
  transition: opacity 140ms ease, transform 140ms ease, box-shadow 140ms ease;
  box-shadow: 0 18px 28px rgba(66, 133, 244, 0.24);
}

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

.primary-button:disabled {
  opacity: 0.52;
  cursor: not-allowed;
  box-shadow: none;
}

.spec-list {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.spec-list div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
}

.spec-list dt {
  font-weight: 700;
}

.spec-list dd {
  margin: 0;
  color: var(--muted);
  text-align: right;
}

.status {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

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

.preview-card {
  padding: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
}

.preview-surface {
  position: relative;
  display: grid;
  place-items: center;
  margin-top: 14px;
  min-height: 360px;
  border-radius: 22px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(236, 242, 250, 0.94)),
    linear-gradient(45deg, rgba(21, 32, 51, 0.05) 25%, transparent 25%, transparent 75%, rgba(21, 32, 51, 0.05) 75%),
    linear-gradient(45deg, rgba(21, 32, 51, 0.05) 25%, transparent 25%, transparent 75%, rgba(21, 32, 51, 0.05) 75%);
  background-size: auto, 26px 26px, 26px 26px;
  background-position: 0 0, 0 0, 13px 13px;
}

#input-preview,
#output-canvas {
  max-width: min(100%, 430px);
  max-height: min(100%, 430px);
  width: auto;
  height: auto;
  display: none;
}

.placeholder {
  max-width: 280px;
  margin: 0;
  padding: 0 20px;
  text-align: center;
  line-height: 1.7;
  color: var(--muted);
}

@media (max-width: 960px) {
  .workspace {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .page {
    width: min(100vw - 20px, 1180px);
    padding-top: 28px;
  }

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

  .preview-surface {
    min-height: 280px;
  }
}