:root {
  --bg: #f4efe5;
  --card: rgba(255, 251, 244, 0.88);
  --card-strong: #fff8ef;
  --line: rgba(69, 54, 37, 0.12);
  --text: #24170d;
  --muted: #6f5845;
  --accent: #d96f32;
  --accent-strong: #b8511b;
  --accent-soft: rgba(217, 111, 50, 0.14);
  --shadow: 0 18px 40px rgba(77, 52, 28, 0.12);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 174, 103, 0.26), transparent 38%),
    radial-gradient(circle at right center, rgba(199, 229, 199, 0.34), transparent 30%),
    linear-gradient(145deg, #f8f1e3 0%, #f0e5d4 45%, #ebe4d8 100%);
}

img {
  display: block;
  max-width: 100%;
}

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

.page-shell {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero-card,
.workspace-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card {
  padding: 36px;
}

.workspace-card {
  margin-top: 24px;
  padding: 28px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.86rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.04;
}

.lead {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.dropzone {
  display: grid;
  place-items: center;
  min-height: 220px;
  padding: 24px;
  border: 2px dashed rgba(217, 111, 50, 0.35);
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(255, 248, 239, 0.94)),
    repeating-linear-gradient(
      -45deg,
      rgba(217, 111, 50, 0.03),
      rgba(217, 111, 50, 0.03) 14px,
      transparent 14px,
      transparent 28px
    );
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease,
    background-color 0.2s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.is-active {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.dropzone-copy {
  display: grid;
  gap: 8px;
  text-align: center;
}

.dropzone-copy strong {
  font-size: 1.2rem;
}

.dropzone-copy span {
  color: var(--muted);
}

.control-row {
  display: grid;
  grid-template-columns: 180px 180px minmax(180px, 1fr) auto auto;
  gap: 16px;
  align-items: center;
  margin-top: 22px;
}

.format-card,
.quality-card {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--card-strong);
  border: 1px solid var(--line);
}

.format-card span,
.quality-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.format-card select {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fffaf4;
  color: var(--text);
  outline: none;
}

.format-card select:focus-visible {
  border-color: rgba(217, 111, 50, 0.58);
}

.quality-card strong {
  font-size: 1.05rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

input[type="range"]:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.quality-card.is-disabled {
  opacity: 0.7;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  text-decoration: none;
  transition:
    transform 0.18s ease,
    opacity 0.18s ease,
    background-color 0.18s ease,
    border-color 0.18s ease;
}

.primary-btn {
  background: var(--accent);
  color: #fffaf4;
  border-color: var(--accent);
}

.primary-btn:hover:not(:disabled),
.secondary-btn:hover:not(.disabled) {
  transform: translateY(-1px);
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.secondary-btn {
  background: transparent;
  color: var(--accent-strong);
  border-color: rgba(217, 111, 50, 0.24);
}

.secondary-btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.control-note,
.status-text {
  margin: 14px 2px 0;
  color: var(--muted);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.panel {
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.56);
  padding: 18px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.panel-head h2 {
  margin: 0;
  font-size: 1.08rem;
}

.panel-head span {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: right;
}

.preview-wrap {
  display: grid;
  place-items: center;
  min-height: 320px;
  margin-top: 14px;
  border-radius: 18px;
  overflow: hidden;
  background:
    linear-gradient(45deg, rgba(36, 23, 13, 0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(36, 23, 13, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(36, 23, 13, 0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(36, 23, 13, 0.05) 75%);
  background-size: 24px 24px;
  background-position:
    0 0,
    0 12px,
    12px -12px,
    -12px 0;
}

.preview-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.placeholder {
  color: var(--muted);
}

@media (max-width: 980px) {
  .control-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 880px) {
  .control-row,
  .result-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}