:root {
  color-scheme: light;
  --bg: oklch(1 0 0);
  --surface: oklch(0.975 0 0);
  --surface-strong: oklch(0.945 0.006 32.1);
  --ink: oklch(0.205 0.025 32.1);
  --muted: oklch(0.44 0.025 32.1);
  --line: oklch(0.885 0.012 32.1);
  --primary: oklch(0.58 0.16 30);
  --primary-strong: oklch(0.5 0.17 30);
  --accent: oklch(0.42 0.115 205);
  --success-bg: oklch(0.94 0.045 150);
  --success-text: oklch(0.29 0.09 150);
  --error-bg: oklch(0.95 0.045 24);
  --error-text: oklch(0.36 0.13 24);
  --focus: oklch(0.64 0.15 205);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.shell {
  min-height: 100vh;
  padding: 40px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  background:
    linear-gradient(180deg, var(--surface) 0, var(--bg) 260px);
}

.workspace {
  width: min(980px, 100%);
}

.heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 22px;
}

.heading h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: 0;
  text-wrap: balance;
}

.heading p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.status-pill {
  flex: 0 0 auto;
  padding: 7px 10px;
  border-radius: 999px;
  background: oklch(0.92 0.045 205);
  color: oklch(0.29 0.1 205);
  font-size: 0.875rem;
  font-weight: 700;
}

.tool-panel {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}

.control-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) minmax(220px, 0.8fr);
  gap: 14px;
}

.file-drop {
  min-height: 88px;
  border: 1px dashed oklch(0.72 0.06 32.1);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px;
  cursor: pointer;
  font-weight: 700;
  transition:
    border-color 180ms ease,
    background 180ms ease;
}

.file-drop:hover {
  border-color: var(--primary);
  background: var(--surface-strong);
}

.file-drop input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.date-control {
  min-height: 88px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
}

.date-control > span {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 700;
}

.date-control div {
  display: flex;
  align-items: center;
  gap: 10px;
}

.date-control input {
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font-weight: 700;
}

.summary-bar {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 8px;
  background: oklch(0.96 0.018 205);
  color: oklch(0.28 0.075 205);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  font-weight: 700;
}

.message {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  display: flex;
  gap: 10px;
  align-items: center;
  font-weight: 700;
}

.message.error {
  background: var(--error-bg);
  color: var(--error-text);
}

.message.success {
  background: var(--success-bg);
  color: var(--success-text);
}

.preview {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.preview-head,
.preview-row {
  display: grid;
  grid-template-columns: minmax(150px, 1.1fr) minmax(120px, 0.8fr) minmax(140px, 0.8fr);
  gap: 12px;
  align-items: center;
}

.preview-head {
  padding: 11px 14px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
}

.preview-row {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  color: var(--ink);
}

.preview-row span:first-child {
  font-weight: 700;
}

.primary-action {
  margin-top: 18px;
  width: 100%;
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: pointer;
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.primary-action:hover:not(:disabled) {
  background: var(--primary-strong);
}

.primary-action:active:not(:disabled) {
  transform: translateY(1px);
}

.primary-action:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

@media (max-width: 720px) {
  .shell {
    padding: 22px 12px;
  }

  .heading {
    display: block;
  }

  .status-pill {
    display: inline-flex;
    margin-top: 12px;
  }

  .tool-panel {
    padding: 14px;
  }

  .control-grid,
  .preview-head,
  .preview-row {
    grid-template-columns: 1fr;
  }

  .preview-head {
    display: none;
  }

  .preview-row {
    gap: 5px;
  }

  .preview-row span:nth-child(2)::before {
    content: "Gốc: ";
    color: var(--muted);
    font-weight: 700;
  }

  .preview-row span:nth-child(3)::before {
    content: "Sau chỉnh: ";
    color: var(--muted);
    font-weight: 700;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}