/* 大学ノートのホームページ。色はアプリのデザイントークン（src/renderer/styles/tokens.css）と同じ */
:root {
  --paper: #fbf8f1;
  --paper-ink: #2b2b2b;
  --paper-ink-weak: #5f636a;
  --rule: #cfe0ea;
  --rule-margin: #e88b8b;
  --card: #ffffff;
  --pop1: #ffe14d;
  --pop2: #ff9ec4;
  --pop3: #6fe3b8;
  --pop4: #7cccff;
  --pop5: #ffad5c;
  --pop6: #c3a6ff;
  --c1: #f6c445;
  --c2: #f28b82;
  --c4: #8ab4f8;
  --font-body: 'Noto Sans JP', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-head: 'Zen Maru Gothic', 'Noto Sans JP', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--paper-ink);
  font: 16px/1.8 var(--font-body);
  /* 罫線ノート：横の罫線と、左の赤い余白の線 */
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, transparent 63px, var(--rule-margin) 63px, var(--rule-margin) 65px, transparent 65px),
    repeating-linear-gradient(to bottom, transparent 0 31px, var(--rule) 31px 32px);
}
a {
  color: inherit;
}
h1,
h2,
h3 {
  font-family: var(--font-head);
  line-height: 1.4;
}

.top {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px max(16px, calc((100% - 1040px) / 2));
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(6px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 700 20px var(--font-head);
  text-decoration: none;
}
.brand img {
  border-radius: 8px;
}
.top nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}
.top nav a {
  text-decoration: none;
}
.top nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 16px 0 80px;
}

.hero {
  position: relative;
  padding: 56px 0 40px;
}
.badge {
  display: inline-block;
  margin: 0;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--pop1);
  font: 700 13px/26px var(--font-head);
}
.hero h1 {
  margin: 12px 0 8px;
  font-size: clamp(34px, 6vw, 56px);
}
.lead {
  max-width: 34em;
  margin: 0 0 24px;
  font-size: 17px;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}
.muted {
  color: var(--paper-ink-weak);
}
.small {
  font-size: 14px;
}

.btn {
  display: inline-block;
  padding: 10px 22px;
  border: 2px solid var(--paper-ink);
  border-radius: 999px;
  background: var(--card);
  font: 700 15px var(--font-head);
  text-decoration: none;
  transition: transform 0.12s;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn--primary {
  background: var(--paper-ink);
  color: #fff;
}
.btn:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid var(--c4);
  outline-offset: 2px;
}

/* マスキングテープで貼った授業フォルダ（アプリのホームと同じ見た目） */
.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 40px;
}
.folder {
  position: relative;
  width: 190px;
  padding: 26px 18px 18px;
  border-radius: 6px;
  background: var(--card);
  box-shadow: 0 6px 14px rgba(43, 43, 43, 0.12);
  font: 700 17px var(--font-head);
}
.folder small {
  display: block;
  margin-top: 6px;
  color: var(--paper-ink-weak);
  font: 500 13px var(--font-body);
}
.folder--1 {
  transform: rotate(-2deg);
}
.folder--2 {
  transform: rotate(1.5deg);
}
.folder--3 {
  transform: rotate(-0.8deg);
}
.tape {
  position: absolute;
  top: -10px;
  left: 50%;
  width: 84px;
  height: 22px;
  translate: -50% 0;
  opacity: 0.8;
}
.folder--1 .tape {
  background: var(--c2);
}
.folder--2 .tape {
  background: repeating-linear-gradient(45deg, var(--c1) 0 6px, #fff3 6px 12px);
}
.folder--3 .tape {
  background: var(--c4);
}

.section {
  padding: 48px 0;
}
.section h2 {
  margin: 0 0 24px;
  font-size: 28px;
}

/* 回の付箋の色で並べた「できること」 */
.notes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.note {
  position: relative;
  padding: 20px 22px 24px;
  box-shadow: 0 6px 14px rgba(43, 43, 43, 0.1);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.note h3 {
  margin: 0 0 8px;
  font-size: 19px;
}
.note p {
  margin: 0 0 8px;
}
.note--1 {
  background: var(--pop1);
}
.note--2 {
  background: var(--pop2);
}
.note--3 {
  background: var(--pop3);
}
.note--4 {
  background: var(--pop4);
}
.note--5 {
  background: var(--pop5);
}
.note--6 {
  background: var(--pop6);
}

.downloads {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin: 16px 0;
}
.dl {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 22px;
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 2px 6px rgba(43, 43, 43, 0.08);
}
.dl h3 {
  margin: 0;
  font-size: 22px;
}
.dl p {
  margin: 0;
}

details {
  max-width: 46em;
  margin-bottom: 12px;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--card);
  box-shadow: 0 2px 6px rgba(43, 43, 43, 0.08);
}
summary {
  font: 700 16px var(--font-head);
  cursor: pointer;
}
details p {
  margin: 8px 0 4px;
}

.foot {
  padding: 32px 16px 48px 80px;
  text-align: center;
  color: var(--paper-ink-weak);
  font-size: 14px;
}
.foot p {
  margin: 4px 0;
}

/* 利用規約・プライバシーポリシー */
.doc {
  max-width: 820px;
  padding-top: 32px;
  padding-bottom: 32px;
}
.doc h1 {
  margin: 0 0 4px;
  font-size: 32px;
}
.doc h2 {
  margin: 40px 0 8px;
  font-size: 22px;
}
.doc h3 {
  margin: 24px 0 4px;
  font-size: 17px;
}
.doc p,
.doc li {
  margin: 0 0 8px;
}
.doc ol,
.doc ul {
  padding: 16px 24px 16px 40px;
  border-radius: 10px;
  background: var(--card);
  box-shadow: 0 2px 6px rgba(43, 43, 43, 0.08);
}
.callout {
  margin: 16px 0;
  padding: 4px 0 0;
}
.callout ul {
  background: #fff8e1;
}
.two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.two h3 {
  margin-top: 8px;
}

@media (max-width: 640px) {
  body {
    background-image: repeating-linear-gradient(to bottom, transparent 0 31px, var(--rule) 31px 32px);
  }
  main,
  .foot {
    padding-left: 16px;
  }
  .top nav {
    display: none;
  }
  .folder {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn {
    transition: none;
  }
}