:root {
  --bg: #eef3ef;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-solid: #ffffff;
  --ink: #15201a;
  --muted: #66746c;
  --soft: #f4f7f4;
  --line: #dce5df;
  --accent: #2f9e58;
  --accent-dark: #1e743d;
  --accent-soft: #e4f3e9;
  --danger: #aa4737;
  --shadow: 0 22px 60px rgba(28, 45, 34, 0.12);
  --shadow-soft: 0 10px 28px rgba(28, 45, 34, 0.08);
  font-family:
    "Avenir Next",
    "PingFang SC",
    "Microsoft YaHei",
    ui-sans-serif,
    system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 0%, rgba(47, 158, 88, 0.13), transparent 28%),
    linear-gradient(90deg, rgba(31, 87, 53, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(31, 87, 53, 0.055) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 44px 44px, 44px 44px, auto;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  filter: grayscale(0.35);
  opacity: 0.46;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.app {
  width: min(100%, 1480px);
  margin: 0 auto;
  padding: 28px 28px 36px;
}

.header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  align-items: end;
  margin-bottom: 22px;
}

.eyebrow {
  margin-bottom: 8px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(42px, 5vw, 76px);
  line-height: 0.95;
  letter-spacing: 0;
}

.lead {
  max-width: 560px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.upload,
.primary,
.secondary,
.ghost,
.mode,
.download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 900;
  white-space: nowrap;
  transition:
    transform 150ms ease,
    box-shadow 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease;
}

.upload,
.primary,
.download {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 14px 28px rgba(47, 158, 88, 0.24);
}

.upload {
  min-width: 150px;
  min-height: 54px;
  font-size: 18px;
}

.upload:hover,
.primary:hover,
.download:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.upload input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.secondary {
  color: var(--ink);
  background: var(--accent-soft);
}

.ghost {
  min-height: 38px;
  color: var(--muted);
  background: var(--panel-solid);
  border: 1px solid var(--line);
}

.layout {
  display: grid;
  grid-template-columns: 390px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.side {
  display: grid;
  gap: 16px;
}

.card,
.main-card,
.guide-card,
.faq-card {
  border: 1px solid rgba(220, 229, 223, 0.9);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.main-card {
  min-width: 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.card-head,
.canvas-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.card-head {
  align-items: flex-start;
}

h2 {
  font-size: 18px;
  line-height: 1.25;
}

.card-head p,
.canvas-head p {
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.thumb-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-height: 380px;
  min-height: 240px;
  overflow: auto;
  padding: 14px;
}

.thumb-grid.empty {
  display: grid;
  place-items: center;
}

.empty,
.stage-empty {
  color: var(--muted);
  text-align: center;
}

.thumb {
  position: relative;
  min-height: 162px;
  border: 2px solid transparent;
  border-radius: 8px;
  background: var(--panel-solid);
  box-shadow:
    inset 0 0 0 1px var(--line),
    0 10px 24px rgba(31, 44, 36, 0.06);
  overflow: hidden;
  touch-action: none;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    box-shadow 120ms ease;
}

.thumb img {
  display: block;
  width: 100%;
  height: 118px;
  object-fit: cover;
  pointer-events: none;
  user-select: none;
}

.thumb strong {
  display: block;
  padding: 10px 38px 10px 10px;
  font-size: 12px;
  line-height: 1.25;
}

.thumb.dragging {
  z-index: 2;
  border-color: var(--accent);
  box-shadow: 0 16px 30px rgba(47, 158, 88, 0.22);
  transform: scale(1.035);
}

.thumb-target {
  border-color: var(--accent);
}

.delete {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  color: var(--danger);
  background: #faece8;
  font-weight: 900;
}

.controls {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf8;
}

.mode {
  min-height: 40px;
  color: var(--muted);
  background: transparent;
}

.mode.active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 9px 20px rgba(47, 158, 88, 0.2);
}

.field,
.mini-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--muted);
  background: var(--panel-solid);
  font-size: 14px;
}

.field input,
.field select,
.mini-field input {
  width: 72px;
  border: 0;
  outline: 0;
  color: var(--ink);
  font-weight: 900;
  text-align: right;
  background: transparent;
}

.field select {
  width: auto;
  min-width: 82px;
}

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

.watermark-text-field {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.watermark-text-field textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  color: var(--ink);
  background: var(--panel-solid);
  outline: 0;
}

.watermark-text-field textarea:focus,
.field:focus-within {
  border-color: rgba(47, 158, 88, 0.58);
  box-shadow: 0 0 0 3px rgba(47, 158, 88, 0.11);
}

.primary {
  min-height: 54px;
  margin-top: 2px;
  font-size: 18px;
}

.preview-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.preview-meta {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border-radius: 8px;
  padding: 0 12px;
  color: var(--muted);
  background: #f3f6f3;
  font-size: 13px;
  font-weight: 800;
}

.download {
  min-width: 150px;
  min-height: 54px;
  font-size: 18px;
}

.stage {
  position: relative;
  display: grid;
  place-items: center;
  height: clamp(560px, calc(100dvh - 205px), 790px);
  overflow: hidden;
  padding: 24px;
  background:
    linear-gradient(45deg, #edf2ee 25%, transparent 25%),
    linear-gradient(-45deg, #edf2ee 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #edf2ee 75%),
    linear-gradient(-45deg, transparent 75%, #edf2ee 75%),
    #fbfcfb;
  background-size: 18px 18px;
  background-position:
    0 0,
    0 9px,
    9px -9px,
    -9px 0;
}

#canvas {
  display: none;
  width: auto;
  height: auto;
  max-width: none;
  max-height: none;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(20, 31, 25, 0.22);
  touch-action: none;
}

.stage-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 30px;
}

.stage-empty strong {
  color: var(--ink);
  font-size: 22px;
}

.stage-empty span {
  max-width: 360px;
  line-height: 1.7;
}

.guide {
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.guide-card {
  padding: 28px 32px;
}

.guide-card h2,
.faq h2 {
  margin-bottom: 18px;
  font-size: 28px;
  line-height: 1.2;
}

.guide-card ol {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 24px;
  color: #354139;
  font-size: 17px;
  line-height: 1.75;
}

.faq {
  display: grid;
  gap: 16px;
}

.faq-card {
  padding: 24px 30px;
}

.faq-card h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.3;
}

.faq-card p {
  color: #3d4942;
  font-size: 16px;
  line-height: 1.8;
}

.footer {
  margin-top: 38px;
  padding: 34px 0 4px;
  border-top: 1px solid rgba(198, 210, 202, 0.94);
  color: var(--muted);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(280px, 1.5fr) repeat(2, minmax(160px, 0.65fr));
  gap: 38px;
  align-items: start;
}

.footer-brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.footer-logo {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border-radius: 8px;
  color: #fff;
  background: var(--ink);
  box-shadow: 0 14px 28px rgba(21, 32, 26, 0.18);
  font-size: 24px;
  font-weight: 900;
}

.footer h2,
.footer h3 {
  margin: 0;
  color: #253226;
  line-height: 1.2;
}

.footer h2 {
  font-size: 28px;
}

.footer h3 {
  margin-bottom: 16px;
  font-size: 18px;
}

.footer p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.65;
}

.footer strong {
  color: var(--ink);
}

.footer-column {
  display: grid;
  gap: 12px;
}

.footer a,
.footer button,
.footer span {
  width: fit-content;
  border: 0;
  padding: 0;
  color: #526056;
  background: transparent;
  font: inherit;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.5;
  text-align: left;
  text-decoration: none;
}

.footer a:hover,
.footer button:hover {
  color: var(--accent-dark);
}

.policy-dialog {
  width: min(92vw, 760px);
  border: 0;
  border-radius: 8px;
  padding: 0;
  background: transparent;
}

.policy-dialog::backdrop {
  background: rgba(17, 28, 21, 0.42);
  backdrop-filter: blur(4px);
}

.policy-box {
  overflow: hidden;
  border: 1px solid rgba(220, 229, 223, 0.94);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 30px 80px rgba(18, 34, 24, 0.22);
}

.policy-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}

.policy-head h2 {
  margin: 0;
  font-size: 22px;
}

.policy-head button {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  color: var(--muted);
  background: var(--soft);
  font-size: 24px;
  line-height: 1;
}

.policy-content {
  display: grid;
  gap: 12px;
  max-height: 64dvh;
  overflow: auto;
  padding: 24px;
  color: #3d4942;
  font-size: 16px;
  line-height: 1.85;
}

.policy-content p {
  margin: 0;
}

#workCanvas {
  position: fixed;
  left: -99999px;
  top: -99999px;
}

body.sorting,
body.sorting * {
  cursor: grabbing !important;
  user-select: none;
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 340px minmax(0, 1fr);
  }

  .stage {
    height: clamp(520px, calc(100dvh - 190px), 720px);
  }
}

@media (max-width: 900px) {
  .app {
    padding: 18px;
  }

  .header,
  .layout,
  .card-head,
  .canvas-head {
    display: grid;
    grid-template-columns: 1fr;
  }

  .upload,
  .download {
    width: 100%;
  }

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

  .thumb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: 330px;
  }

  .stage {
    height: 64dvh;
    min-height: 430px;
    padding: 16px;
  }

  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .app {
    padding: 14px;
  }

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

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

  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer h2 {
    font-size: 24px;
  }
}