:root {
  --sky: #8FCDE8;
  --navy: #2D4A66;
  --sunny: #FFE585;
  --pink: #FFC4D8;
  --line: #E5EDF2;
  --muted: #7B8FA1;
  --surface: rgba(255, 255, 255, .82);
  --page: #F7FBFD;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--navy);
  background:
    radial-gradient(circle at 10% 8%, rgba(143, 205, 232, .2), transparent 30rem),
    radial-gradient(circle at 90% 25%, rgba(255, 196, 216, .16), transparent 28rem),
    var(--page);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(1120px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  letter-spacing: .08em;
}

.brand-main { font-size: 15px; font-weight: 700; }
.brand-divider { width: 1px; height: 20px; background: var(--line); }
.brand-sub { color: var(--muted); font-size: 12px; letter-spacing: .04em; }
.logout-link { color: var(--muted); font-size: 13px; text-underline-offset: 4px; }

.site-main {
  width: min(1120px, calc(100% - 40px));
  flex: 1;
  margin: 0 auto;
  padding: 72px 0 96px;
}

.page-heading, .course-heading { max-width: 720px; margin-bottom: 38px; }
.eyebrow { margin: 0 0 8px; color: #527E94; font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(28px, 4.5vw, 44px); line-height: 1.35; letter-spacing: .02em; }
h2 { line-height: 1.45; }
.lead { margin: 18px 0 0; color: #536E82; font-size: 16px; }
.muted, .form-note { color: var(--muted); }

.narrow-panel {
  width: min(580px, 100%);
  margin: 8px auto 0;
  padding: clamp(28px, 6vw, 54px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
}

.auth-panel h1 { font-size: clamp(28px, 7vw, 38px); }
.login-form { display: grid; gap: 10px; margin-top: 32px; }
.login-form label { font-size: 13px; font-weight: 700; }
.login-form input {
  width: 100%;
  min-height: 52px;
  padding: 12px 16px;
  color: var(--navy);
  background: #fff;
  border: 1px solid #C9D9E3;
  border-radius: 12px;
  outline: none;
}
.login-form input:focus { border-color: #5BAACD; outline: 3px solid rgba(143, 205, 232, .3); }
.login-form button {
  min-height: 52px;
  margin-top: 10px;
  padding: 12px 24px;
  border: 1px solid #6BB8D9;
  border-radius: 999px;
  color: var(--navy);
  background: var(--sky);
  font-weight: 700;
  cursor: pointer;
}
.login-form button:hover { background: #A7D9EE; }
.form-note { margin: 18px 0 0; font-size: 12px; }
.notice { padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 13px; }
.notice-error { background: #FFF6F8; border-color: var(--pink); }
.sent-panel { text-align: center; }
.sent-panel .muted { margin: 22px 0 28px; font-size: 13px; }
.mail-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 24px;
  display: grid;
  place-items: center;
  border: 1px solid #BBDDEB;
  border-radius: 50%;
  background: #EAF7FC;
  font-size: 24px;
}
.text-link { color: #477991; font-size: 13px; text-underline-offset: 4px; }

.course-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.course-card {
  position: relative;
  min-height: 330px;
  display: flex;
  flex-direction: column;
  padding: 30px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
}
.course-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 7px; background: var(--sky); }
.course-card.pillar-mind::before { background: var(--pink); }
.course-card.pillar-flow::before { background: var(--sunny); }
.pillar-label { margin: 8px 0 18px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.course-card h2 { margin: 0 0 14px; font-size: 23px; }
.course-card > p:not(.pillar-label, .lesson-count) { margin: 0; color: #61798B; font-size: 14px; }
.lesson-count { margin: auto 0 16px; padding-top: 28px; color: var(--muted); font-size: 12px; }
.card-link { align-self: flex-start; font-size: 14px; font-weight: 700; text-decoration-color: #9CCFE4; text-underline-offset: 5px; }

.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: -28px 0 38px; color: var(--muted); font-size: 12px; }
.breadcrumbs a { text-underline-offset: 3px; }
.lesson-list { display: grid; gap: 12px; }
.lesson-row {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  overflow: hidden;
}
.lesson-main {
  min-width: 0;
  min-height: 104px;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 20px 24px;
  text-decoration: none;
}
a.lesson-main:hover { background: rgba(143, 205, 232, .08); }
.lesson-main strong, .lesson-main small { display: block; }
.lesson-main strong { margin-bottom: 4px; font-size: 15px; }
.lesson-main small { color: var(--muted); font-size: 12px; line-height: 1.65; }
.lesson-number { color: #5C91A9; font-size: 19px; font-weight: 700; letter-spacing: .04em; }
.lesson-arrow { font-size: 20px; }
.progress-check {
  width: 90px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border-right: 1px solid var(--line);
  color: var(--muted);
  font-size: 10px;
  cursor: pointer;
}
.progress-check input, .lesson-complete input { width: 20px; height: 20px; accent-color: #62B4D6; }
.is-pending { grid-template-columns: 90px 1fr; background: rgba(255, 255, 255, .56); }
.is-pending .lesson-main { opacity: .7; grid-template-columns: 48px minmax(0, 1fr); }
.pending-label { display: grid; place-items: center; border-right: 1px solid var(--line); color: var(--muted); font-size: 11px; }

.lesson-page { width: min(920px, 100%); margin: 0 auto; }
.lesson-heading { margin-bottom: 28px; }
.lesson-heading h1 { font-size: clamp(26px, 5vw, 38px); }
.video-frame { position: relative; width: 100%; padding-top: 56.25%; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: #162838; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lesson-summary { margin-top: 24px; padding: clamp(22px, 5vw, 34px); border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.lesson-summary h2 { margin: 0 0 10px; font-size: 18px; }
.lesson-summary p { margin: 0; color: #61798B; font-size: 14px; }
.lesson-complete { display: flex; align-items: center; gap: 10px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 13px; cursor: pointer; }
.lesson-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 26px; }
.lesson-nav a { min-height: 86px; display: flex; flex-direction: column; justify-content: center; padding: 16px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); text-decoration: none; }
.lesson-nav a.next { text-align: right; }
.lesson-nav small { color: var(--muted); font-size: 10px; }
.lesson-nav span { font-size: 13px; font-weight: 700; }

.site-footer { background: var(--navy); color: #fff; }
.footer-inner { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 46px 0 34px; text-align: center; }
.site-footer p { margin: 8px 0; font-size: 12px; }
.site-footer a { color: #fff; text-underline-offset: 3px; }
.footer-brand { font-size: 15px !important; font-weight: 600; letter-spacing: .1em; }
.legal-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 4px; margin: 16px 0; font-size: 11px; }
.copyright { margin-top: 22px !important; font-size: 11px !important; opacity: .7; }

@media (max-width: 820px) {
  .course-grid { grid-template-columns: 1fr; }
  .course-card { min-height: 260px; }
  .site-main { padding-top: 54px; }
}

@media (max-width: 560px) {
  .header-inner, .site-main, .footer-inner { width: min(100% - 28px, 1120px); }
  .header-inner { min-height: 58px; }
  .brand { gap: 8px; }
  .brand-main { font-size: 13px; }
  .brand-sub { font-size: 10px; }
  .brand-divider { height: 16px; }
  .logout-link { font-size: 11px; }
  .site-main { padding: 42px 0 70px; }
  .narrow-panel { padding: 28px 22px; border-radius: 18px; }
  .course-card { min-height: 0; padding: 26px 22px; }
  .lesson-count { margin-top: 22px; }
  .breadcrumbs { margin-top: -18px; }
  .lesson-row { grid-template-columns: 1fr; }
  .progress-check { width: auto; min-height: 42px; flex-direction: row; border-right: 0; border-bottom: 1px solid var(--line); }
  .progress-check input { width: 17px; height: 17px; }
  .lesson-main { min-height: 96px; grid-template-columns: 38px minmax(0, 1fr) auto; gap: 10px; padding: 16px; }
  .lesson-main small { display: none; }
  .is-pending { grid-template-columns: 1fr; }
  .pending-label { min-height: 34px; border-right: 0; border-bottom: 1px solid var(--line); }
  .is-pending .lesson-main { grid-template-columns: 38px minmax(0, 1fr); }
  .lesson-number { font-size: 16px; }
  .video-frame { margin-inline: -14px; width: calc(100% + 28px); border-radius: 12px; }
  .lesson-nav { grid-template-columns: 1fr; }
  .lesson-nav .nav-placeholder { display: none; }
  .lesson-nav a.next { text-align: left; }
  .legal-links { display: grid; gap: 6px; }
  .legal-links span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}