/* ============ 屏幕 UI：作业本 / 文具风 ============ */

:root {
  --paper: #f3ecdc;        /* 米色桌面 */
  --card: #fffdf6;         /* 面板卡片 */
  --card-edge: #e5dbc4;
  --ink: #33302a;          /* 正文墨色 */
  --ink-soft: #857f6f;
  --blue: #2d5185;         /* 墨蓝 */
  --blue-deep: #1f3c66;
  --red: #c8461d;          /* 朱红 */
  --red-deep: #a83812;
  --grid-line: rgba(45, 81, 133, 0.07);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font: 14px/1.6 "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--paper);
  /* 方格稿纸底纹 */
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
}

.layout {
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
}

/* ---------- 设置面板 ---------- */

.panel {
  position: sticky;
  top: 0;
  flex: none;
  width: 336px;
  max-height: 100vh;
  overflow-y: auto;
  padding: 20px 22px 28px;
  background: var(--card);
  border-right: 1px solid var(--card-edge);
  box-shadow: 2px 0 14px rgba(90, 70, 30, 0.08);
}

.brand {
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 2px dashed var(--card-edge);
}

.brand-mark {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--red);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  transform: rotate(-2deg);
}

.brand-name {
  margin: 8px 0 2px;
  font-family: "Kaiti SC", "STKaiti", "KaiTi", serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--blue-deep);
}

.brand-sub {
  margin: 0;
  font-size: 12px;
  color: var(--ink-soft);
}

.group {
  margin-bottom: 16px;
}

.group-title {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--blue);
}

.group-title::before {
  content: "▪ ";
  color: var(--red);
}

.input {
  width: 100%;
  padding: 7px 10px;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  outline: none;
}

.input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(45, 81, 133, 0.12);
}

.pair {
  display: flex;
  gap: 10px;
}

.pair + .pair {
  margin-top: 8px;
}

.field {
  flex: 1;
  display: block;
}

.field > span {
  display: block;
  margin-bottom: 3px;
  font-size: 12px;
  color: var(--ink-soft);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  cursor: pointer;
  user-select: none;
}

.check input {
  width: 16px;
  height: 16px;
  accent-color: var(--blue);
  cursor: pointer;
}

/* ---------- 预设按钮 ---------- */

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.preset {
  padding: 5px 11px;
  font: 13px/1.4 inherit;
  font-family: inherit;
  color: var(--blue);
  background: #fff;
  border: 1px solid var(--blue);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.15s;
}

.preset:hover {
  background: var(--blue);
  color: #fff;
  transform: translateY(-1px);
}

/* ---------- 操作按钮 ---------- */

.actions {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: 20px;
}

.btn {
  padding: 11px 14px;
  font: 600 15px/1.4 inherit;
  font-family: inherit;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  color: #fff;
  background: var(--red);
  box-shadow: 0 3px 10px rgba(200, 70, 29, 0.35);
}

.btn-primary:hover {
  background: var(--red-deep);
}

.btn-ghost {
  color: var(--blue);
  background: transparent;
  border: 1.5px solid var(--blue);
}

.btn-ghost:hover {
  background: rgba(45, 81, 133, 0.08);
}

.hint {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------- 预览区 ---------- */

.preview {
  flex: 1;
  min-width: 0;
  padding: 32px 24px 60px;
  overflow-x: auto;
}

#preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.notice {
  max-width: 210mm;
  margin: 0 auto 18px;
  padding: 10px 14px;
  font-size: 13px;
  color: #7a4a08;
  background: #fdf3dd;
  border: 1px solid #ecd9ae;
  border-radius: 10px;
}

/* ---------- 移动端：面板置顶，预览横向滚动 ---------- */

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .panel {
    position: static;
    width: 100%;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--card-edge);
  }

  .preview {
    width: 100%;
    padding: 20px 12px 40px;
  }

  #preview {
    align-items: flex-start;
  }
}