/**
 * L01 一般现在时讲义 · 专题样式（外壳见 ../shared/grammar-handout.css）
 */

:root {
      --paper: #fff9f0;
      --ink: #333;
      --ink-soft: #555;
      --crayon-red: #e85d4c;
      --crayon-blue: #4a90d9;
      --crayon-green: #5cb85c;
      --crayon-purple: #9b59b6;
      --crayon-orange: #f0ad4e;
      --zone-be: rgba(74, 144, 217, 0.12);
      --zone-do: rgba(92, 184, 92, 0.12);
      --zone-adv: rgba(255, 193, 7, 0.14);
      --shadow: rgba(60, 40, 20, 0.1);
      --lesson-font-sans: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --lesson-fs-example: clamp(1.02rem, 0.5vw + 0.9rem, 1.2rem);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
body.grammar-handout-page.l01-handout {
      font-family: var(--lesson-font-sans);
      background:
        radial-gradient(circle at 10% 15%, rgba(255, 220, 180, 0.38) 0%, transparent 42%),
        radial-gradient(circle at 90% 85%, rgba(200, 230, 255, 0.32) 0%, transparent 40%),
        linear-gradient(168deg, #ffeaa7 0%, #fab1a0 30%, #dfe6e9 100%);
      color: var(--ink);
    }

body.grammar-handout-page main.sheet.l01-handout {
      max-width: var(--gh-sheet-max, 900px);
      margin: 0 auto;
      background: var(--paper);
      border-radius: 12px 28px 16px 20px;
      border: 4px solid var(--crayon-orange);
      box-shadow: 6px 8px 0 var(--crayon-red), 14px 18px 32px var(--shadow);
      padding: 1.5rem 1.5rem 2rem;
      position: relative;
    }
    .inner { position: relative; z-index: 1; }

    /* —— 讲义封面（屏幕） —— */
    .handout-cover {
      position: relative;
      margin: -0.25rem -0.5rem 1.25rem;
      padding: 2.5rem 1.5rem 2.75rem;
      border-radius: 10px 24px 12px 20px;
      overflow: hidden;
      text-align: center;
      color: #1a2a3a;
    }
    .handout-cover__bg {
      position: absolute;
      inset: 0;
      background:
        linear-gradient(145deg, #e8f4f8 0%, #f8fbfd 42%, #fff 100%),
        radial-gradient(ellipse 80% 60% at 15% 10%, rgba(74, 144, 217, 0.18), transparent 55%),
        radial-gradient(ellipse 70% 50% at 90% 85%, rgba(13, 148, 136, 0.12), transparent 50%);
      border: 1px solid rgba(13, 148, 136, 0.2);
      border-radius: inherit;
      z-index: 0;
    }
    .handout-cover__bg::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 5px;
      background: linear-gradient(90deg, #0d9488, #4a90d9, #0d9488);
    }
    .handout-cover__bg::after {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(
          circle at 20% 30%,
          rgba(74, 144, 217, 0.07) 0 1px,
          transparent 1px
        ),
        radial-gradient(circle at 80% 70%, rgba(13, 148, 136, 0.06) 0 1px, transparent 1px);
      background-size: 18px 18px, 22px 22px;
      opacity: 0.65;
      pointer-events: none;
    }
    .handout-cover__inner {
      position: relative;
      z-index: 1;
      max-width: 28rem;
      margin: 0 auto;
    }
    .handout-cover__brand {
      margin: 0 0 1rem;
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 0.2em;
      color: #0f766e;
      text-transform: none;
    }
    .handout-cover__en {
      margin: 0 0 0.35rem;
      font-family: "Georgia", "Times New Roman", "Songti SC", serif;
      font-size: 1.05rem;
      font-style: italic;
      font-weight: 400;
      letter-spacing: 0.12em;
      color: #4a7c9b;
    }
    .handout-cover__title {
      margin: 0 0 0.5rem;
      font-size: clamp(2rem, 5vw, 2.65rem);
      font-weight: 800;
      letter-spacing: 0.14em;
      line-height: 1.2;
      color: #0d1b2a;
      text-shadow: none;
    }
    .handout-cover__rule {
      width: 3.5rem;
      height: 3px;
      margin: 0 auto 1rem;
      border-radius: 2px;
      background: linear-gradient(90deg, transparent, #0d9488, transparent);
    }
    .handout-cover__focus {
      margin: 0;
      font-size: 0.88rem;
      line-height: 1.65;
      font-weight: 500;
      color: #475569;
      letter-spacing: 0.04em;
    }

    .doc-title {
      font-family: var(--lesson-font-sans);
      font-size: 1.48rem;
      text-align: center;
      color: var(--crayon-red);
      margin: 0 0 0.75rem;
      text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.06);
      line-height: 1.3;
    }
    h2.section-title {
      font-family: var(--lesson-font-sans);
      font-size: 1.12rem;
      color: #1a237e;
      margin: 1.6rem 0 0.75rem;
      padding-bottom: 0.35rem;
      border-bottom: 3px solid rgba(74, 144, 217, 0.35);
      display: flex;
      align-items: center;
      gap: 0.35rem;
      flex-wrap: wrap;
    }
    h2.section-title:first-of-type { margin-top: 0; }
    h3.block-title {
      font-size: 1rem;
      color: #0d47a1;
      margin: 0.75rem 0 0.45rem;
    }
    .tap-card {
      transition: transform 0.12s ease;
      will-change: transform;
    }
    @media (hover: none) and (pointer: coarse) {
      .tap-card:active { transform: scale(0.985); }
    }
    .tap-card:hover { transform: scale(1.005); }
    .mind-wrap {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
      margin-bottom: 1rem;
    }
    .mind-pillars {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.65rem;
    }
    @media (max-width: 560px) {
      .mind-pillars { grid-template-columns: 1fr; }
    }
    /* 习惯 / 真理 / 日程 · 三栏例句 */
    .handout-usage-three-col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.65rem;
      margin-top: 0.75rem;
    }
    @media (max-width: 720px) {
      .handout-usage-three-col { grid-template-columns: 1fr; }
    }
    .handout-usage-col {
      padding: 0.65rem 0.55rem;
      border-radius: 12px;
      border: 2px solid rgba(13, 148, 136, 0.22);
      background: rgba(255, 255, 255, 0.85);
    }
    .handout-usage-col--habit { border-top: 3px solid var(--crayon-blue); }
    .handout-usage-col--truth { border-top: 3px solid var(--crayon-green); }
    .handout-usage-col--schedule { border-top: 3px solid var(--crayon-orange); }
    .handout-usage-three-col .usage-col-title {
      margin: 0 0 0.45rem;
      padding-bottom: 0.35rem;
      border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    }
    .handout-usage-three-col .ex-pair:last-child,
    .handout-rules-two-col .ex-pair:last-child {
      margin-bottom: 0;
    }
    .mind-pillar {
      text-align: center;
      padding: 0.85rem 0.65rem;
      border-radius: 16px;
      border: 3px dashed rgba(155, 89, 182, 0.45);
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(243, 229, 245, 0.45) 100%);
      font-size: 0.9rem;
    }
    .mind-pillar .ico { font-size: 1.85rem; line-height: 1; margin-bottom: 0.35rem; }
    .mind-pillar strong { display: block; color: #6a1b9a; margin-bottom: 0.25rem; }
    .parallel-universe {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
      margin-top: 0.75rem;
    }
    @media (max-width: 640px) {
      .parallel-universe { grid-template-columns: 1fr; }
    }
    .pu-box {
      padding: 0.85rem 1rem;
      border-radius: 14px;
      border: 3px solid;
      font-size: 0.88rem;
      line-height: 1.55;
    }
    .pu-be {
      border-color: rgba(74, 144, 217, 0.55);
      background: var(--zone-be);
    }
    .pu-do {
      border-color: rgba(46, 125, 50, 0.55);
      background: var(--zone-do);
    }
    .pu-box h4 {
      margin: 0 0 0.4rem;
      font-size: 0.98rem;
    }
    .pu-be h4 { color: #1565c0; }
    .pu-do h4 { color: #2e7d32; }
    .never-mix {
      margin-top: 0.75rem;
      padding: 0.65rem 0.85rem;
      border-radius: 12px;
      background: rgba(211, 47, 47, 0.1);
      border: 2px dashed #c62828;
      font-size: 0.86rem;
      font-weight: 700;
      color: #b71c1c;
      text-align: center;
    }
    table.data-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.84rem;
      margin: 0.5rem 0;
    }
    table.data-table th,
    table.data-table td {
      border: 2px solid rgba(0, 0, 0, 0.1);
      padding: 0.4rem 0.5rem;
      text-align: left;
    }
    table.data-table th {
      background: rgba(74, 144, 217, 0.15);
      color: #0d47a1;
    }
    .key-term {
      font-weight: 800;
      border-bottom: 2px dotted rgba(0, 0, 0, 0.35);
    }
    .warn-strip {
      padding: 0.55rem 0.75rem;
      border-radius: 10px;
      background: rgba(255, 235, 238, 0.85);
      border-left: 5px solid #e53935;
      font-size: 0.86rem;
      margin: 0.5rem 0;
      color: #b71c1c;
      font-weight: 700;
    }
    .intonation {
      font-family: var(--lesson-font-sans);
      font-size: var(--lesson-fs-example);
      padding: 0.5rem 0.65rem;
      background: rgba(255, 249, 196, 0.5);
      border-radius: 10px;
      margin: 0.45rem 0;
    }
    .algo-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.5rem;
      font-size: 0.82rem;
    }
    @media (max-width: 520px) {
      .algo-grid { grid-template-columns: 1fr; }
    }
    .algo-card {
      padding: 0.55rem 0.65rem;
      border-radius: 12px;
      border: 2px dashed rgba(46, 125, 50, 0.4);
      background: rgba(232, 245, 233, 0.5);
    }
    .algo-card strong { color: #1b5e20; }
    /* 规则 1～4 例句 · 两栏 */
    .handout-rules-two-col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
      margin-top: 0.65rem;
    }
    @media (max-width: 640px) {
      .handout-rules-two-col { grid-template-columns: 1fr; }
    }
    .handout-rules-col {
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
      min-width: 0;
    }
    .handout-rule-block {
      padding: 0.55rem 0.6rem;
      border-radius: 12px;
      border: 2px solid rgba(46, 125, 50, 0.22);
      background: rgba(255, 255, 255, 0.9);
    }
    .handout-rule-block--1 { border-top: 3px solid var(--crayon-blue); }
    .handout-rule-block--2 { border-top: 3px solid var(--crayon-green); }
    .handout-rule-block--3 { border-top: 3px solid var(--crayon-orange); }
    .handout-rule-block--4 { border-top: 3px solid var(--crayon-purple); }
    .handout-rules-two-col .rule-block-title {
      margin: 0 0 0.4rem;
      padding-bottom: 0.35rem;
      border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    }
    .handout-freq-block--be { border-top: 3px solid var(--crayon-blue); }
    .handout-freq-block--verb { border-top: 3px solid var(--crayon-green); }
    .handout-freq-block--aux { border-top: 3px solid var(--crayon-orange); }
    .handout-freq-block--sometimes { border-top: 3px solid var(--crayon-purple); }
    .ipa {
      font-family: "Segoe UI", sans-serif;
      font-size: 0.8rem;
      color: #6a1b9a;
    }
    .mirror-box {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.5rem;
      padding: 0.75rem;
      border-radius: 14px;
      background: linear-gradient(90deg, rgba(255, 213, 79, 0.2), rgba(129, 199, 132, 0.2));
      border: 3px solid rgba(255, 152, 0, 0.45);
      font-size: 0.86rem;
      margin: 0.5rem 0;
    }
    .mirror-box code {
      background: rgba(0, 0, 0, 0.06);
      padding: 0.15rem 0.35rem;
      border-radius: 6px;
      font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
      font-size: 0.95rem;
    }
    .adv-block {
      border-radius: 14px;
      padding: 0.9rem 1rem;
      margin-bottom: 0.85rem;
      border: 3px solid rgba(230, 126, 34, 0.45);
      background: var(--zone-adv);
    }
    .adv-block h3 {
      margin: 0 0 0.45rem;
      font-size: 0.98rem;
      color: #e65100;
    }
    .adv-block ul {
      margin: 0.35rem 0 0;
      padding-left: 1.15rem;
      font-size: 0.86rem;
    }
    .en-line {
      font-family: var(--lesson-font-sans);
      font-size: var(--lesson-fs-example);
      margin: 0.35rem 0 0;
      padding: 0.4rem 0.5rem;
      background: rgba(255, 255, 255, 0.75);
      border-radius: 8px;
      border-left: 4px solid var(--crayon-orange);
    }
    .zh-line {
      font-size: 0.84rem;
      color: var(--ink-soft);
      margin: 0.2rem 0 0.65rem;
      padding: 0 0.5rem 0 0.85rem;
      border-left: 3px solid rgba(74, 144, 217, 0.35);
      line-height: 1.5;
    }
    .ex-pair { margin-bottom: 0.15rem; }
    .mini-note {
      font-size: 0.82rem;
      color: #555;
      margin: 0.35rem 0 0.5rem;
    }
    button.tts-chip {
      font-family: var(--lesson-font-sans);
      font-size: 0.78rem;
      padding: 0.15rem 0.45rem;
      margin-left: 0.35rem;
      border-radius: 999px;
      border: 2px solid var(--crayon-red);
      background: #fff;
      cursor: pointer;
      vertical-align: middle;
      touch-action: manipulation;
    }
    button.tts-chip:hover { background: #ffebee; }
    .print-hint {
      font-size: 0.76rem;
      color: #888;
      text-align: center;
      margin-top: 1.25rem;
    }
    .lesson-footer-nav {
      max-width: 860px;
      margin: 1.25rem auto 0;
      padding: 0.5rem 0.75rem;
      text-align: center;
      font-size: 0.84rem;
      color: #555;
      font-family: var(--lesson-font-sans);
    }
    .lesson-footer-nav a {
      color: var(--crayon-blue);
      text-decoration: none;
      font-weight: 700;
    }
    .lesson-footer-nav .nav-sep { margin: 0 0.35rem; color: #aaa; }
    .handout-pdf-bar {
      max-width: 860px;
      margin: 0 auto 0.75rem;
      padding: 0 1rem;
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .btn-handout-pdf {
      font-family: var(--lesson-font-sans);
      font-size: 0.92rem;
      padding: 0.5rem 1.15rem;
      border-radius: 999px;
      border: 3px solid var(--crayon-orange);
      background: linear-gradient(180deg, #fff 0%, #fff9f0 100%);
      color: #1565c0;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 2px 3px 0 rgba(0, 0, 0, 0.08);
      touch-action: manipulation;
    }
    .btn-handout-pdf:hover { background: #e3f2fd; }
    .btn-handout-pdf:disabled { opacity: 0.55; cursor: not-allowed; }
    .handout-header { margin-bottom: 0.25rem; }
    body.grammar-handout-page.l01-handout .doc-subtitle {
      text-align: center;
      color: var(--ink-soft);
      font-weight: 800;
      font-size: 0.92rem;
      margin: 0 0 1rem;
    }
    body.grammar-handout-page.l01-handout .intro {
      margin-bottom: 0.85rem;
      padding: 0.75rem 0.9rem;
      border-radius: 14px;
      border: 3px solid var(--crayon-orange);
      background: linear-gradient(180deg, rgba(255, 249, 240, 0.95), #fff);
      font-size: 0.88rem;
      line-height: 1.65;
    }
    .handout-section {
      margin-bottom: 0.25rem;
    }
    body.grammar-handout-page.l01-handout .adv-block h3 {
      font-size: 1rem;
      color: #0d47a1;
      margin: 0 0 0.45rem;
    }
    body.grammar-handout-page.l01-handout .quote-box {
      font-weight: 700;
      color: var(--ink);
    }
    /* 页边距 / 正文字号 / 页码：见shared/grammar-handout-print.css */
    @media print {
      /* 内部分割线见 ../grammar-handout-print.css；此处仅 L01 布局 */
      .tap-card,
      .mind-pillar,
      .pu-box,
      .adv-block,
      .ex-pair {
        box-shadow: none !important;
      }
      body.grammar-handout-page.l01-handout h2.section-title {
        color: #0d1b2a !important;
      }
      h2.section-title + .mind-wrap,
      h2.section-title + .adv-block,
      h2.section-title + .skeleton-wrap {
        break-before: avoid !important;
        page-break-before: avoid !important;
      }
      h3 {
        font-weight: 700 !important;
        color: #bf360c !important;
        margin: 0 0 1.5mm !important;
        page-break-after: avoid !important;
      }
      .mind-wrap {
        margin: 0 0 3mm !important;
      }
      .mind-pillars {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 2mm !important;
      }
      .mind-pillar {
        text-align: center !important;
      }
      .parallel-universe {
        display: grid !important;
        grid-template-columns: 1fr 1fr !important;
        gap: 2.5mm !important;
      }
      .pu-be h4 {
        color: #0d47a1 !important;
      }
      .pu-do h4 {
        color: #1b5e20 !important;
      }
      .never-mix {
        text-align: left !important;
      }
      /* 双栏「平行宇宙」+ 底部红框整段同页，不拆开 */
      .handout-parallel-block {
        page-break-inside: avoid !important;
        break-inside: avoid !important;
      }
      .handout-parallel-block .parallel-universe {
        gap: 2mm !important;
      }
      .handout-parallel-block .pu-box {
        padding: 1.5mm 2mm !important;
      }
      .handout-parallel-block .pu-box h4 {
        margin: 0 0 1mm !important;
      }
      .handout-parallel-block .ex-pair {
        margin: 0 0 1.5mm !important;
      }
      .handout-parallel-block .en-line {
        padding: 1mm 1.75mm !important;
        margin: 0.75mm 0 0 !important;
      }
      .handout-parallel-block .zh-line {
        margin: 0 0 1.25mm !important;
      }
      .handout-parallel-block .never-mix {
        margin-top: 2mm !important;
        padding: 1.5mm 2mm !important;
      }
      .adv-block {
        margin: 0 0 2.5mm !important;
      }
      .adv-block h3 {
        color: #e65100 !important;
      }
      table.data-table th,
      table.data-table td {
        border: 0.35pt solid #616161 !important;
        padding: 1.5mm 2mm !important;
      }
      table.data-table th {
        background: #eceff1 !important;
        color: #000 !important;
      }
      .key-term {
        font-weight: 700 !important;
        border-bottom: 0.4pt dotted #333 !important;
      }
      .warn-strip {
        padding: 2mm 2.5mm !important;
        border-left: 2pt solid #d32f2f !important;
        background: #ffebee !important;
      }
      .algo-grid {
        display: grid !important;
        grid-template-columns: 1fr 1fr !important;
        gap: 2mm !important;
      }
      .algo-card {
        border: 0.35pt dashed #388e3c !important;
        background: #f9fff9 !important;
        padding: 2mm !important;
      }
      .ipa {
        font-family: var(--lesson-font-sans) !important;
      }
      .mirror-box {
        border: 0.4pt solid #ffa726 !important;
        background: #fffbf0 !important;
        padding: 2mm 2.5mm !important;
      }
      .intonation {
        font-family: var(--lesson-font-sans) !important;
        border: 0.35pt solid #ffcc80 !important;
        background: #fffde7 !important;
      }
      .tap-card {
        transform: none !important;
      }
      p {
        orphans: 3;
        widows: 3;
      }
    }

/* 与全课程 data 表统一 */
body.grammar-handout-page.l01-handout .data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  margin: 0.5rem 0;
}
body.grammar-handout-page.l01-handout .data-table th,
body.grammar-handout-page.l01-handout .data-table td {
  border: 2px solid rgba(13, 148, 136, 0.25);
  padding: 0.4rem 0.5rem;
  vertical-align: top;
}
body.grammar-handout-page.l01-handout .data-table th {
  background: rgba(204, 251, 241, 0.55);
  color: var(--gh-accent-ink, #0f766e);
  font-weight: 800;
}

/* 表格打印线：见 shared/grammar-handout-print.css */