/* ====== 共通スタイル: 古文Webスライド ====== */
:root {
  --navy: #1E2761;
  --navy-deep: #131840;
  --ice: #CADCFC;
  --gold: #D4A24C;
  --gold-soft: #E8C078;
  --white: #FFFFFF;
  --ink: #2C2C2C;
  --muted: #6B7280;
  --paper: #F8F5EE;
  --font-mincho: "Shippori Mincho", "游明朝", "Yu Mincho", serif;
  --font-gothic: "Zen Kaku Gothic New", "游ゴシック", "Yu Gothic", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { font-family: var(--font-gothic); color: var(--ink); background: #0a0d20; }

/* デフォルト: 縦長画面(モバイル・タブレット縦)── フルワイド + スクロール可 */
html, body { height: 100%; overflow-x: hidden; overflow-y: auto; }
.stage { position: relative; width: 100%; min-height: 100vh; display: flex; align-items: flex-start; justify-content: center; padding: clamp(8px, 2vw, 24px) clamp(8px, 2vw, 24px) 80px; }
.slide-frame { position: relative; width: 100%; max-width: 900px; min-height: calc(100vh - 96px); background: var(--white); border-radius: clamp(6px, 0.8vw, 14px); box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.25); overflow: hidden; }
.slide { position: absolute; inset: 0; padding: clamp(24px, 5cqi, 60px); container-type: inline-size; display: flex; flex-direction: column; opacity: 0; visibility: hidden; transition: opacity 0.4s ease; overflow-y: auto; }
.slide.active { opacity: 1; visibility: visible; }

/* 横長画面(PC・横長タブレット)── 16:9 厳守、ビューポートにフィット */
@media (min-aspect-ratio: 4/3) and (min-width: 900px) {
  html, body { height: 100%; overflow: hidden; }
  .stage { width: 100vw; height: 100vh; align-items: center; padding: clamp(8px, 2vw, 24px); }
  .slide-frame { width: min(calc(100vw - 32px), calc((100vh - 80px) * 16 / 9)); max-width: none; height: min(calc((100vw - 32px) * 9 / 16), calc(100vh - 80px)); min-height: 0; }
  .slide { padding: clamp(28px, 4.2cqi, 72px); overflow: hidden; }
}
.bg-white { background: var(--white); }
.bg-navy { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%); color: var(--white); }
.bg-paper { background: var(--paper); }
.eyebrow { font-size: clamp(10px, 1.1cqi, 14px); font-weight: 500; color: var(--gold); letter-spacing: 0.4em; margin-bottom: 0.6em; }
.h-title { font-family: var(--font-mincho); font-weight: 800; color: var(--navy); letter-spacing: 0.02em; }
.bg-navy .h-title { color: var(--white); }
.h-2 { font-size: clamp(22px, 3.8cqi, 46px); line-height: 1.2; }
.subtitle { font-size: clamp(12px, 1.4cqi, 18px); color: var(--muted); margin-top: 0.6em; font-style: italic; }
.bg-navy .subtitle { color: var(--ice); }

/* Title slide */
.title-slide { justify-content: center; }
.title-slide::before { content: ""; position: absolute; left: clamp(20px, 3cqi, 48px); top: 20%; width: clamp(3px, 0.4cqi, 5px); height: 60%; background: var(--gold); }
.title-slide .stack { padding-left: clamp(30px, 4cqi, 64px); }
.title-slide .course { color: var(--ice); font-size: clamp(11px, 1.3cqi, 16px); letter-spacing: 0.5em; margin-bottom: clamp(8px, 1.2cqi, 18px); }
.title-slide .lec-no { color: var(--gold); font-family: var(--font-mincho); font-weight: 700; font-size: clamp(18px, 2.4cqi, 28px); margin-bottom: clamp(12px, 1.6cqi, 24px); }
.title-slide .main { font-family: var(--font-mincho); font-weight: 800; color: var(--white); font-size: clamp(32px, 5.5cqi, 64px); line-height: 1.15; margin-bottom: clamp(12px, 1.8cqi, 28px); }
.title-slide .sub { color: var(--ice); font-style: italic; font-size: clamp(13px, 1.6cqi, 20px); }
.title-slide .meta { position: absolute; bottom: clamp(20px, 3cqi, 48px); left: clamp(50px, 7cqi, 112px); right: clamp(20px, 3cqi, 48px); display: flex; justify-content: space-between; font-size: clamp(10px, 1.2cqi, 14px); color: var(--ice); }
.title-slide .meta .right { color: var(--gold); }

/* Goals slide */
.goals-slide .head { margin-bottom: clamp(18px, 2.5cqi, 36px); }
.goal-row { display: flex; align-items: flex-start; gap: clamp(14px, 2cqi, 26px); padding: clamp(10px, 1.4cqi, 18px) 0; }
.goal-circle { flex-shrink: 0; width: clamp(48px, 6.5cqi, 78px); height: clamp(48px, 6.5cqi, 78px); border-radius: 50%; background: var(--navy); color: var(--gold); display: flex; align-items: center; justify-content: center; font-family: var(--font-mincho); font-weight: 700; font-size: clamp(18px, 2.4cqi, 28px); }
.goal-body .gt { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(18px, 2.6cqi, 30px); margin-bottom: 0.2em; }
.goal-body .gd { font-size: clamp(12px, 1.5cqi, 18px); color: var(--ink); }

/* Conclusion 2-cards */
.conclusion-slide .cards { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 2.2cqi, 32px); margin-top: clamp(16px, 2.4cqi, 32px); margin-bottom: clamp(16px, 2.2cqi, 28px); }
.card { background: var(--white); color: var(--ink); border-radius: clamp(4px, 0.5cqi, 8px); padding: clamp(18px, 2.6cqi, 36px) clamp(20px, 2.8cqi, 38px); position: relative; overflow: hidden; }
.card::before { content: ""; position: absolute; left: 0; top: 0; width: clamp(3px, 0.45cqi, 6px); height: 100%; background: var(--gold); }
.card .ct { font-family: var(--font-mincho); font-weight: 800; color: var(--navy); font-size: clamp(28px, 4.5cqi, 52px); margin-bottom: 0.4em; }
.card .cm { font-weight: 700; color: var(--ink); font-size: clamp(14px, 1.9cqi, 22px); margin-bottom: 0.6em; }
.card .cd { font-size: clamp(11px, 1.3cqi, 15px); color: var(--muted); margin-bottom: 1em; }
.card .ctr { font-size: clamp(11px, 1.4cqi, 16px); color: var(--navy); font-style: italic; }
.conclusion-slide .footer-msg { text-align: center; color: var(--gold); font-weight: 700; font-size: clamp(13px, 1.7cqi, 20px); margin-top: auto; }

/* Conjugation slide */
.conj-slide .conj-table { width: 100%; border-collapse: collapse; margin: clamp(14px, 2cqi, 26px) 0 clamp(18px, 2.6cqi, 32px); }
.conj-table th, .conj-table td { text-align: center; padding: clamp(10px, 1.4cqi, 18px); border: 1px solid var(--ice); }
.conj-table th { background: var(--navy); color: var(--white); font-weight: 700; font-size: clamp(12px, 1.5cqi, 18px); }
.conj-table td { background: var(--white); font-family: var(--font-mincho); font-weight: 700; font-size: clamp(18px, 2.6cqi, 28px); color: var(--ink); }
.conj-table td.hi { background: var(--gold); color: var(--white); }
.conj-table td.null-form { color: var(--muted); font-family: var(--font-gothic); font-weight: 400; }
.conj-section .divider { height: 3px; background: var(--gold); margin: clamp(8px, 1.2cqi, 16px) 0; }
.conj-section .section-title { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(14px, 1.8cqi, 22px); margin-bottom: clamp(8px, 1.2cqi, 14px); }
.conj-points { display: flex; flex-direction: column; gap: clamp(4px, 0.8cqi, 8px); }
.conj-points li { list-style: none; font-size: clamp(11px, 1.4cqi, 16px); }
.conj-points li .term { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); }

/* Example slide */
.example-slide .head { margin-bottom: clamp(14px, 2cqi, 22px); }
.example-box { background: var(--paper); border-left: clamp(3px, 0.5cqi, 6px) solid var(--navy); padding: clamp(16px, 2.4cqi, 32px) clamp(20px, 2.8cqi, 38px); margin-bottom: clamp(18px, 2.6cqi, 32px); }
.bg-navy .example-box { background: var(--white); border-left-color: var(--gold); }
.example-box .ex-label { display: inline-block; font-size: clamp(9px, 1.1cqi, 13px); color: var(--navy); font-weight: 700; letter-spacing: 0.4em; margin-bottom: 0.5em; }
.example-box .ex-text { font-family: var(--font-mincho); font-weight: 800; color: var(--ink); font-size: clamp(20px, 3.2cqi, 36px); line-height: 1.4; margin-bottom: 0.4em; }
.example-box .ex-trans { font-size: clamp(11px, 1.4cqi, 16px); color: var(--muted); font-style: italic; }
.points-section .section-title { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(13px, 1.7cqi, 20px); margin-bottom: clamp(6px, 1cqi, 12px); }
.bg-navy .points-section .section-title { color: var(--white); }
.points-section .thin-line { height: 2px; background: var(--ice); margin-bottom: clamp(8px, 1.2cqi, 16px); }
.points-list { display: flex; flex-direction: column; gap: clamp(4px, 0.8cqi, 8px); }
.points-list li { list-style: none; font-size: clamp(12px, 1.5cqi, 18px); color: var(--ink); padding-left: 1.2em; text-indent: -1.2em; }
.bg-navy .points-list li { color: var(--white); }
.points-list li.highlight { color: var(--gold); font-weight: 700; }
.points-list li::before { content: "▸ "; color: inherit; }

/* 3-card slide */
.cards3-slide .head { margin-bottom: clamp(12px, 1.6cqi, 20px); }
.cards3-slide .intro { background: var(--paper); border-left: clamp(3px, 0.4cqi, 5px) solid var(--gold); padding: clamp(14px, 2cqi, 24px) clamp(18px, 2.4cqi, 30px); margin-bottom: clamp(14px, 2cqi, 24px); }
.cards3-slide .intro .it { font-family: var(--font-mincho); font-weight: 700; color: var(--ink); font-size: clamp(15px, 2.2cqi, 26px); margin-bottom: 0.3em; }
.cards3-slide .intro .is { font-size: clamp(10px, 1.3cqi, 14px); color: var(--muted); font-style: italic; }
.cards3-slide .section-title { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(13px, 1.7cqi, 20px); margin-bottom: clamp(8px, 1.2cqi, 14px); }
.cards3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: clamp(10px, 1.5cqi, 20px); }
.card3 { border: 1px solid var(--navy); border-radius: clamp(3px, 0.4cqi, 6px); padding: clamp(12px, 1.8cqi, 22px) clamp(14px, 2cqi, 24px); background: var(--white); }
.card3 .num { width: clamp(28px, 4cqi, 42px); height: clamp(28px, 4cqi, 42px); border-radius: 50%; background: var(--navy); color: var(--gold); display: inline-flex; align-items: center; justify-content: center; font-family: var(--font-mincho); font-weight: 700; font-size: clamp(14px, 1.8cqi, 22px); margin-bottom: clamp(8px, 1.2cqi, 14px); }
.card3 .ct { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(13px, 1.8cqi, 22px); margin-bottom: 0.5em; }
.card3 .cd { font-size: clamp(10px, 1.3cqi, 15px); color: var(--ink); line-height: 1.5; }

/* Text-block slide (PATTERN list) */
.textblock-slide .blocks { display: flex; flex-direction: column; gap: clamp(8px, 1.2cqi, 14px); margin-top: clamp(14px, 2cqi, 22px); }
.tb-block { background: var(--paper); border-left: clamp(3px, 0.5cqi, 6px) solid var(--gold); padding: clamp(12px, 1.6cqi, 18px) clamp(16px, 2cqi, 24px); }
.bg-navy .tb-block { background: var(--white); }
.tb-block .tb-label { font-size: clamp(9px, 1.1cqi, 13px); color: var(--navy); font-weight: 700; letter-spacing: 0.3em; margin-bottom: 0.3em; }
.tb-block .tb-head { font-family: var(--font-mincho); font-weight: 700; color: var(--navy); font-size: clamp(13px, 1.8cqi, 19px); line-height: 1.4; }

/* Quiz slide */
.quiz-slide .head { margin-bottom: clamp(14px, 2cqi, 22px); }
.quiz-question { background: var(--navy); color: var(--white); padding: clamp(14px, 2cqi, 22px) clamp(18px, 2.4cqi, 30px); border-radius: clamp(3px, 0.4cqi, 6px); margin-bottom: clamp(14px, 2cqi, 22px); font-size: clamp(12px, 1.5cqi, 18px); }
.choices { display: flex; flex-direction: column; gap: clamp(6px, 0.9cqi, 10px); }
.choice { display: flex; align-items: center; background: var(--white); border: 1px solid var(--ice); border-radius: clamp(3px, 0.4cqi, 6px); padding: clamp(10px, 1.4cqi, 16px) clamp(14px, 2cqi, 22px); gap: clamp(10px, 1.4cqi, 18px); }
.choice.correct { background: var(--gold); border-color: var(--gold); color: var(--white); }
.choice .num { font-family: var(--font-mincho); font-weight: 700; font-size: clamp(14px, 1.8cqi, 20px); min-width: 1.5em; }
.choice .text { font-size: clamp(12px, 1.5cqi, 17px); flex: 1; }
.choice .badge { font-size: clamp(10px, 1.3cqi, 14px); font-weight: 700; }
.quiz-explain { text-align: center; color: var(--navy); font-weight: 700; font-style: italic; font-size: clamp(11px, 1.4cqi, 16px); margin-top: auto; padding-top: clamp(10px, 1.4cqi, 16px); }

/* Checklist slide */
.check-slide .head { margin-bottom: clamp(14px, 2cqi, 24px); }
.checks { display: flex; flex-direction: column; gap: clamp(8px, 1.2cqi, 16px); }
.check-row { display: grid; grid-template-columns: clamp(20px, 2.6cqi, 32px) 1fr auto; align-items: center; gap: clamp(10px, 1.4cqi, 18px); }
.check-box { width: clamp(20px, 2.4cqi, 30px); height: clamp(20px, 2.4cqi, 30px); border: 1.5px solid var(--navy); border-radius: 3px; display: flex; align-items: center; justify-content: center; color: var(--gold); font-weight: 700; font-size: clamp(12px, 1.6cqi, 18px); }
.check-q { font-size: clamp(12px, 1.5cqi, 18px); color: var(--ink); }
.check-a { background: var(--paper); color: var(--navy); font-family: var(--font-mincho); font-weight: 700; padding: clamp(6px, 0.9cqi, 10px) clamp(10px, 1.4cqi, 16px); border-radius: 3px; font-size: clamp(11px, 1.4cqi, 15px); min-width: clamp(120px, 18cqi, 220px); text-align: center; }

/* Next slide */
.next-slide { justify-content: center; }
.next-slide::before { content: ""; position: absolute; left: clamp(20px, 3cqi, 48px); top: 18%; width: clamp(3px, 0.4cqi, 5px); height: 64%; background: var(--gold); }
.next-slide .stack { padding-left: clamp(30px, 4cqi, 64px); }
.next-slide .label { color: var(--gold); letter-spacing: 0.5em; font-weight: 500; font-size: clamp(10px, 1.3cqi, 14px); margin-bottom: clamp(8px, 1.2cqi, 14px); }
.next-slide .lec { color: var(--ice); font-family: var(--font-mincho); font-weight: 700; font-size: clamp(16px, 2.2cqi, 26px); margin-bottom: clamp(8px, 1.2cqi, 16px); }
.next-slide .main { color: var(--white); font-family: var(--font-mincho); font-weight: 800; font-size: clamp(28px, 4.6cqi, 52px); line-height: 1.15; margin-bottom: clamp(8px, 1.2cqi, 18px); }
.next-slide .sub { color: var(--gold); font-family: var(--font-mincho); font-weight: 700; font-size: clamp(20px, 3.2cqi, 36px); margin-bottom: clamp(20px, 3cqi, 40px); }
.next-slide .divider { width: 90%; height: 1px; background: rgba(212, 162, 76, 0.4); margin-bottom: clamp(10px, 1.4cqi, 16px); }
.next-slide .preview-label { color: var(--gold); letter-spacing: 0.4em; font-size: clamp(10px, 1.2cqi, 14px); margin-bottom: 0.4em; }
.next-slide .preview { color: var(--white); font-style: italic; font-size: clamp(11px, 1.4cqi, 16px); }
.next-slide .footer-line { position: absolute; bottom: clamp(20px, 3cqi, 40px); left: 0; right: 0; text-align: center; color: var(--ice); font-style: italic; letter-spacing: 0.4em; font-size: clamp(10px, 1.2cqi, 14px); }

/* Navigation */
.nav-bar { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 8px; background: rgba(255, 255, 255, 0.95); padding: 8px 14px; border-radius: 999px; box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25); z-index: 100; }
.nav-bar button { background: transparent; border: none; cursor: pointer; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--navy); font-size: 16px; font-weight: 700; transition: background 0.15s; }
.nav-bar button:hover { background: var(--ice); }
.nav-bar button:disabled { opacity: 0.3; cursor: default; }
.nav-counter { color: var(--navy); font-size: 13px; font-weight: 700; min-width: 48px; text-align: center; font-variant-numeric: tabular-nums; }
.progress-track { position: fixed; top: 0; left: 0; right: 0; height: 3px; background: rgba(255, 255, 255, 0.1); z-index: 99; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--gold) 0%, var(--gold-soft) 100%); transition: width 0.4s ease; }
.swipe-hint { position: fixed; top: 16px; right: 16px; color: rgba(255, 255, 255, 0.5); font-size: 11px; z-index: 99; }

@media (max-width: 480px) {
  .nav-bar { padding: 6px 10px; }
  .nav-bar button { width: 28px; height: 28px; }
  .nav-counter { font-size: 11px; min-width: 36px; }
  .swipe-hint { font-size: 9px; }
}