:root {
  --ink: #19364c;
  --muted: #7c96a8;
  --line: #dbe9f1;
  --paper: #f7fbfd;
  --white: #ffffff;
  --blue: #77b7ec;
  --aqua: #68c2c8;
  --navy: #11354d;
  --shadow: 0 16px 45px rgba(52, 105, 135, 0.09);
  font-family: "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); }
button, textarea { font: inherit; }
button { border: 0; cursor: pointer; }
.app-shell { min-height: 100vh; display: flex; }
.sidebar { width: 250px; min-height: 100vh; background: #fff; border-right: 1px solid #e3eef4; display: flex; flex-direction: column; padding: 34px 20px 24px; position: fixed; z-index: 5; }
.brand-lockup { display: flex; align-items: center; gap: 12px; padding: 0 12px 32px; }
.brand-mark { width: 38px; height: 48px; display: flex; align-items: center; gap: 2px; transform: rotate(-14deg); }
.brand-mark span { display: block; width: 7px; border-radius: 10px; background: linear-gradient(180deg, #8dc6f4, #65c3c5); }
.brand-mark span:nth-child(1) { height: 29px; margin-top: 13px; opacity: .7; }
.brand-mark span:nth-child(2) { height: 43px; }
.brand-mark span:nth-child(3) { height: 22px; margin-top: 19px; opacity: .55; }
.brand-name { margin: 0; font-family: "Cormorant Garamond", serif; font-size: 25px; line-height: .75; letter-spacing: .03em; color: #6aa4dc; }
.brand-sub { margin: 8px 0 0; font-size: 8px; letter-spacing: .3em; color: #9ab1c0; }
.profile-card { background: #f2f8fb; padding: 12px; border-radius: 14px; display: flex; align-items: center; gap: 10px; margin-bottom: 27px; position: relative; }
.avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; flex: 0 0 auto; font-weight: 700; color: white; }
.avatar-user { background: linear-gradient(145deg, #75c3d0, #78aee9); }
.avatar-tamura { background: linear-gradient(145deg, #e9c2a8, #c8907d); }
.avatar-instructor { background: linear-gradient(145deg, #8aafd1, #3a739e); }
.profile-label { margin: 0; color: #91a9b7; font-size: 10px; }
.profile-name { margin: 1px 0 0; font-size: 12px; font-weight: 700; }
.icon-button { margin-left: auto; background: none; color: #8ea8b7; letter-spacing: 2px; }
.profile-popover, .notification-popover { position: absolute; z-index: 10; background: white; border: 1px solid #dcebf1; border-radius: 13px; box-shadow: 0 16px 35px rgba(42, 89, 113, .14); }
.profile-popover { top: 91px; left: 20px; right: 20px; padding: 13px; }
.popover-label { margin: 0 0 5px; color: #81a8b6; letter-spacing: .15em; font-size: 8px; }
.profile-popover strong { font-size: 11px; display: block; margin-bottom: 8px; }
.profile-popover button { width: 100%; background: none; color: #6c8997; text-align: left; font-size: 10px; padding: 8px 0; border-top: 1px solid #eff4f6; }
.side-nav { display: grid; gap: 7px; }
.side-link { position: relative; text-align: left; padding: 12px 14px; border-radius: 11px; background: transparent; color: #7590a0; font-size: 13px; display: flex; align-items: center; gap: 12px; }
.side-link:hover, .side-link.active { color: #2780b9; background: #eaf7fb; }
.side-link.active::before { content: ""; position: absolute; left: -20px; width: 3px; height: 24px; border-radius: 0 4px 4px 0; background: linear-gradient(#78c8cf, #7cb2ee); }
.nav-icon { width: 17px; text-align: center; font-size: 18px; font-family: serif; }
.nav-divider { height: 1px; background: #edf3f6; margin: 15px 14px 8px; }
.nav-badge { margin-left: auto; font-size: 10px; width: 18px; height: 18px; display: grid; place-items: center; color: white; background: #75bdd1; border-radius: 50%; }
.sidebar-bottom { margin-top: auto; padding: 0 13px; color: #a1b5c0; }
.water-line { width: 48px; height: 1px; background: linear-gradient(90deg, #7cc9cd, transparent); margin-bottom: 15px; }
.sidebar-bottom p { font-family: "Cormorant Garamond", serif; font-size: 14px; line-height: 1.4; margin: 0 0 12px; }
.sidebar-bottom span { font-size: 8px; letter-spacing: .12em; }
.main-content { margin-left: 250px; width: calc(100% - 250px); min-height: 100vh; }
.topbar { height: 77px; padding: 0 52px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #e6f0f4; background: rgba(247,251,253,.82); position: relative; }
.breadcrumb { display: flex; align-items: center; gap: 13px; font-size: 11px; color: #91a8b6; }
.breadcrumb b { color: #bed0da; font-weight: 400; }.breadcrumb strong { color: #46677a; font-weight: 600; }
.top-actions { display: flex; gap: 9px; }.circle-action, .mobile-menu { width: 34px; height: 34px; border-radius: 50%; background: white; color: #7895a8; font-size: 20px; box-shadow: 0 5px 15px rgba(85,125,150,.06); position: relative; }.circle-action.notification { font-size: 15px; }.notification i { position: absolute; width: 6px; height: 6px; border-radius: 50%; background: #ffab9f; top: 7px; right: 7px; border: 2px solid white; }.mobile-menu { display: none; }
.notification-popover { top: 62px; right: 45px; width: 276px; padding: 14px; }.popover-heading { display: flex; justify-content: space-between; align-items: center; font-size: 12px; margin-bottom: 5px; }.popover-heading span { color: #6eb9c1; font-size: 9px; }.notification-popover button { width: 100%; display: grid; grid-template-columns: 35px 1fr; gap: 3px 8px; text-align: left; background: none; padding: 11px 0; border-top: 1px solid #edf3f6; }.notification-popover button b { grid-row: span 2; display: grid; place-items: center; height: 27px; border-radius: 50%; background: #edf8fa; color: #69aeb6; font-size: 9px; }.notification-popover button span { color: #58798a; font-size: 10px; }.notification-popover button small { color: #a0b1ba; font-size: 8px; }
.course-hero { min-height: 288px; position: relative; overflow: hidden; padding: 48px 8%; background: linear-gradient(115deg, #eaf7fb 0%, #d7f0f6 46%, #c2e0fa 100%); isolation: isolate; }
.course-hero::after { content: ""; position: absolute; z-index: -1; right: -10%; bottom: -35%; width: 70%; height: 100%; border: 1px solid rgba(255,255,255,.75); border-radius: 50%; transform: rotate(-13deg); box-shadow: 0 -40px 0 -39px rgba(255,255,255,.7), 0 -80px 0 -79px rgba(255,255,255,.5); }
.hero-copy { position: relative; z-index: 2; }.eyebrow, .section-kicker { color: #66a4c4; font-size: 9px; letter-spacing: .24em; font-weight: 700; margin: 0 0 15px; }.eyebrow-dot { display: inline-block; width: 6px; height: 6px; background: #70c5ca; border-radius: 50%; margin-right: 6px; vertical-align: 1px; box-shadow: 0 0 0 4px rgba(112,197,202,.13); }
.course-hero h1 { font-family: "Noto Sans JP", sans-serif; font-size: clamp(26px, 3vw, 40px); line-height: 1.35; letter-spacing: .05em; margin: 0; color: #31536c; font-weight: 500; }.course-hero h1 em { color: #60b6c1; font-style: normal; }.hero-copy > p { color: #668699; font-size: 12px; line-height: 1.9; margin: 13px 0 20px; }.hero-meta { display: flex; gap: 18px; color: #7395a5; font-size: 10px; }
.hero-art { position: absolute; right: 18%; top: 16px; width: 330px; height: 250px; }.hero-orbit { position: absolute; border: 1px solid rgba(255,255,255,.8); border-radius: 50%; transform: rotate(-25deg); }.orbit-one { width: 250px; height: 105px; top: 57px; left: 46px; }.orbit-two { width: 310px; height: 185px; top: 28px; left: 10px; transform: rotate(24deg); opacity: .65; }.crystal { position: absolute; background: linear-gradient(145deg, rgba(255,255,255,.95), rgba(169,221,231,.42)); clip-path: polygon(48% 0, 78% 18%, 100% 74%, 56% 100%, 15% 78%, 0 22%); filter: drop-shadow(13px 14px 9px rgba(70,143,177,.14)); }.crystal-large { width: 90px; height: 150px; top: 47px; left: 123px; transform: rotate(26deg); }.crystal-small { width: 44px; height: 75px; top: 112px; left: 230px; transform: rotate(-28deg); opacity: .78; }.hero-seal { position: absolute; right: 8px; top: 25px; width: 90px; height: 90px; display: grid; place-content: center; text-align: center; border-radius: 50%; color: white; font-size: 13px; letter-spacing: .16em; line-height: 1.25; background: #8abcf0; transform: rotate(11deg); box-shadow: 0 9px 18px rgba(74,141,193,.2); }.hero-seal span { font-size: 9px; letter-spacing: .24em; }.hero-progress { position: absolute; right: 8%; bottom: 38px; width: 215px; z-index: 2; }.progress-label { display: flex; justify-content: space-between; color: #6e8f9f; font-size: 10px; margin-bottom: 8px; }.progress-label strong { color: #438bb0; font-size: 18px; font-weight: 500; }.progress-track { height: 5px; border-radius: 9px; background: rgba(255,255,255,.65); overflow: hidden; }.progress-track span { height: 100%; display: block; border-radius: inherit; background: linear-gradient(90deg, #64c1c5, #81b5ef); }.hero-progress p { margin: 7px 0 0; font-size: 9px; color: #86a4b4; text-align: right; }
.mobile-course-title { display: none; }.content-wrap { max-width: 900px; margin: 0 auto; padding: 0 36px 70px; }.tabbar { height: 75px; display: flex; align-items: end; gap: 30px; border-bottom: 1px solid var(--line); }.tab { height: 54px; padding: 0 5px; background: transparent; color: #8ea5b2; font-size: 12px; position: relative; }.tab span { font-size: 17px; margin-right: 4px; }.tab.active { color: #317da7; font-weight: 700; }.tab.active::after { content: ""; position: absolute; bottom: -1px; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, #6bc4ca, #79b1ee); }.tab-count { display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: #e3f4f7; color: #62a5b3; font-size: 9px; margin-left: 5px; }
.view { padding-top: 36px; animation: rise .45s ease both; }.view[hidden] { display: none; } @keyframes rise { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }.section-heading { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 22px; }.section-heading h2 { margin: 0; font-size: 23px; font-weight: 600; letter-spacing: .05em; }.section-kicker { margin-bottom: 8px; font-size: 8px; }.outline-button { color: #5b8ea9; background: white; border: 1px solid #d2e7ef; border-radius: 20px; padding: 8px 14px; font-size: 10px; }.outline-button:hover { background: #edf8fa; }.notice-card { position: relative; display: flex; gap: 15px; background: linear-gradient(110deg, rgba(224,247,248,.9), rgba(234,243,253,.92)); border: 1px solid #d5edf1; padding: 18px 20px; border-radius: 13px; margin-bottom: 18px; }.notice-icon { width: 29px; height: 29px; border-radius: 50%; display: grid; place-items: center; background: white; color: #6dbfc6; }.notice-title { font-weight: 700; font-size: 12px; margin: 1px 0 5px; }.notice-card p:last-of-type { margin: 0; font-size: 10px; color: #7894a0; }.dismiss-button { position: absolute; top: 14px; right: 17px; color: #a6bcc6; background: none; font-size: 17px; }.composer-card { display: flex; gap: 12px; background: white; border: 1px solid #e2edf2; border-radius: 14px; padding: 16px; box-shadow: var(--shadow); margin-bottom: 23px; }.composer-main { flex: 1; }.composer-main textarea { width: 100%; border: 0; resize: vertical; outline: 0; color: var(--ink); font-size: 12px; line-height: 1.8; min-height: 48px; }.composer-main textarea::placeholder { color: #a2b4bf; }.composer-actions { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid #eef3f5; padding-top: 11px; }.composer-tools { display: flex; gap: 4px; }.composer-tools button { background: none; color: #99afb9; font-size: 10px; }.primary-button { background: linear-gradient(100deg, #70c6ca, #73aeea); color: white; border-radius: 19px; padding: 9px 16px; font-size: 10px; box-shadow: 0 7px 15px rgba(96,169,201,.2); }.primary-button span { font-size: 15px; margin-left: 5px; }.feed { display: grid; gap: 13px; }.post-card { background: white; border: 1px solid #e4eef2; border-radius: 14px; padding: 18px 20px 13px; }.highlighted-post { border-left: 3px solid #7bc6ce; }.post-head { display: flex; align-items: center; gap: 10px; }.post-author { margin: 0; font-size: 12px; font-weight: 700; }.post-time { margin: 3px 0 0; color: #9db0ba; font-size: 9px; }.member-tag, .instructor-tag { font-size: 8px; color: #77a0b2; background: #edf6f8; border-radius: 9px; padding: 3px 6px; margin-left: 4px; font-weight: 500; }.instructor-tag { background: #e9f2fd; color: #6798cb; }.more-button { margin-left: auto; color: #b4c5cc; background: transparent; letter-spacing: 2px; }.post-body { margin: 16px 0; color: #5f7888; font-size: 12px; line-height: 2; }.post-footer { border-top: 1px solid #eef3f5; display: flex; gap: 17px; padding-top: 11px; }.reaction-button, .comment-button { background: none; color: #9aafb9; font-size: 10px; }.reaction-button.liked { color: #66bfc4; }.post-quote { display: flex; gap: 12px; align-items: center; background: #f7fbfd; border-radius: 10px; padding: 12px 16px; margin-bottom: 16px; }.post-quote > span { color: #8bc4d0; font: 30px Georgia; line-height: .7; }.post-quote strong { font-size: 10px; }.post-quote p { margin: 4px 0 0; color: #829ba8; font-size: 10px; }
.completion-note { color: #65a8be; font-size: 11px; }.contents-intro { display: flex; justify-content: space-between; align-items: center; background: linear-gradient(120deg, #dff5f4, #e8f2fd); border-radius: 15px; padding: 25px 30px; margin-bottom: 17px; }.intro-eyebrow { color: #75aeb5; font-size: 8px; letter-spacing: .2em; margin: 0 0 10px; }.contents-intro h3 { margin: 0; font-size: 20px; line-height: 1.5; font-weight: 500; }.contents-intro p:last-child { color: #7594a4; font-size: 10px; margin: 9px 0 0; }.mini-progress { width: 76px; height: 76px; border-radius: 50%; display: grid; place-content: center; text-align: center; background: conic-gradient(#70bec9 32%, rgba(255,255,255,.64) 0); position: relative; }.mini-progress::after { content: ""; position: absolute; inset: 7px; background: #e5f4f6; border-radius: 50%; }.mini-progress strong, .mini-progress span { position: relative; z-index: 1; }.mini-progress strong { font-size: 16px; color: #498fae; }.mini-progress span { font-size: 8px; color: #7ea2b1; }.lesson-list { display: grid; gap: 9px; }.lesson-card { width: 100%; text-align: left; display: flex; align-items: center; gap: 15px; padding: 16px 17px; border: 1px solid #e2edf2; border-radius: 13px; background: white; color: var(--ink); transition: .2s ease; }.lesson-card:hover, .lesson-card.current { border-color: #9ed3df; box-shadow: 0 10px 22px rgba(81,150,178,.09); transform: translateY(-1px); }.lesson-number { color: #a6bec9; font: 600 22px "Cormorant Garamond", serif; width: 30px; }.lesson-copy { display: grid; gap: 3px; flex: 1; }.lesson-copy small { color: #79a9ba; font-size: 8px; letter-spacing: .16em; }.lesson-copy strong { font-size: 12px; }.lesson-copy em { color: #a0b2bb; font-size: 9px; font-style: normal; }.lesson-status { width: 23px; height: 23px; display: grid; place-items: center; border-radius: 50%; color: white; background: #79c5c5; font-size: 12px; }.lesson-status.play { background: #7cafe6; font-size: 9px; padding-left: 2px; }.lesson-status.lock { color: #a8bac3; background: #f0f5f7; }.lesson-arrow { color: #a9c1cb; font-size: 17px; }
.overview-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 18px; }.overview-main, .overview-facts { background: white; border: 1px solid #e1edf2; border-radius: 14px; padding: 25px; }.overview-main h3 { margin: 0 0 17px; font-size: 20px; line-height: 1.55; font-weight: 500; }.overview-main > p { color: #667f8e; font-size: 11px; line-height: 2; margin: 0 0 12px; }.overview-quote { border-left: 2px solid #7bc8cd; color: #83a2b0; font-family: "Cormorant Garamond", serif; font-size: 16px; line-height: 1.55; padding: 11px 0 11px 15px; margin-top: 22px; }.overview-quote em { color: #67a9bd; font-style: normal; }.overview-facts { padding: 7px 20px; display: grid; }.overview-facts > div { display: flex; flex-direction: column; justify-content: center; border-bottom: 1px solid #edf3f6; padding: 14px 0; }.overview-facts > div:last-child { border: 0; }.overview-facts span { font-size: 8px; letter-spacing: .16em; color: #83acba; }.overview-facts strong { color: #4c90ae; font-size: 22px; font-weight: 500; margin: 2px 0; }.overview-facts strong small { font-size: 10px; margin-left: 3px; }.overview-facts small { color: #9baeba; font-size: 9px; }.info-row { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 14px; background: white; border: 1px solid #e1edf2; border-radius: 14px; padding: 18px 22px; }.info-row > div { display: flex; align-items: center; gap: 11px; padding: 0 20px; border-right: 1px solid #edf3f6; }.info-row > div:first-child { padding-left: 0; }.info-row > div:last-child { border: 0; }.info-icon { color: #74b9c4; font-size: 22px; }.info-row small { display: block; color: #9baeba; font-size: 9px; margin-bottom: 4px; }.info-row strong { font-size: 11px; }
.lesson-card.done-locally .lesson-status { background: #79c5c5; font-size: 0; }.lesson-card.done-locally .lesson-status::before { content: "✓"; font-size: 12px; }.lesson-card.done-locally .lesson-copy em { color: #65aeb3; }
.room-toolbar { display: flex; align-items: center; justify-content: space-between; min-height: 50px; padding: 0 14px; border: 1px solid #e2edf2; border-radius: 8px; background: #fff; margin-bottom: 12px; }.room-toolbar div { display: flex; align-items: center; gap: 11px; }.room-toolbar strong { font-size: 11px; }.room-toolbar span { color: #9aafb9; font-size: 9px; }.room-toolbar button { color: #6da4b5; background: #f3fafb; border-radius: 16px; padding: 7px 10px; font-size: 9px; }
.content-filters { display: flex; gap: 7px; align-items: center; margin: -4px 0 17px; }.filter-chip { color: #8ba0ab; background: transparent; border: 1px solid transparent; border-radius: 4px; padding: 7px 11px; font-size: 10px; }.filter-chip span { color: #a7bbc4; margin-left: 3px; }.filter-chip:hover { color: #5d9bac; background: #f1f9fa; }.filter-chip.active { color: #4d98aa; background: #eaf7f8; border-color: #cfecef; font-weight: 700; }
.course-hero { min-height: 250px; padding-top: 38px; padding-bottom: 38px; }.hero-art { right: 13%; transform: scale(.86); opacity: .76; }.content-wrap { max-width: 1040px; }.tabbar { gap: 24px; }.tab { height: 50px; }.notice-card, .composer-card, .post-card, .contents-intro, .overview-main, .overview-facts, .info-row { border-radius: 8px; }.notice-card { padding: 15px 17px; }.composer-card, .post-card { box-shadow: none; }.post-card { padding: 17px 18px 12px; }
@media (max-width: 680px) { .room-toolbar { align-items: flex-start; gap: 9px; padding: 11px 12px; }.room-toolbar div { display: grid; gap: 3px; }.room-toolbar span { font-size: 8px; }.room-toolbar button { white-space: nowrap; }.content-filters { overflow-x: auto; margin-right: -17px; padding-right: 17px; scrollbar-width: none; }.content-filters::-webkit-scrollbar { display: none; }.filter-chip { flex: 0 0 auto; }.course-hero { min-height: 250px; padding-top: 29px; }.hero-art { transform: scale(.75); right: -35px; opacity: .45; }.content-wrap { max-width: none; }.tabbar { gap: 8px; }.tab { height: 50px; } }
.toast { position: fixed; z-index: 20; bottom: 24px; left: 50%; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; color: white; background: #244b62; padding: 12px 18px; border-radius: 22px; font-size: 11px; box-shadow: 0 10px 25px rgba(26,62,82,.23); transition: .25s ease; }.toast.show { opacity: 1; transform: translate(-50%, 0); }
@media (max-width: 900px) { .sidebar { width: 210px; }.main-content { margin-left: 210px; width: calc(100% - 210px); }.topbar { padding: 0 30px; }.course-hero { padding-left: 7%; }.hero-art { right: 2%; opacity: .8; }.hero-progress { right: 7%; } }
@media (max-width: 680px) { .sidebar { transform: translateX(-100%); transition: .25s ease; width: 250px; box-shadow: 10px 0 35px rgba(35,84,110,.12); }.sidebar.open { transform: none; }.main-content { margin-left: 0; width: 100%; }.topbar { height: 62px; padding: 0 18px; }.mobile-menu { display: block; font-size: 16px; margin-right: 11px; }.breadcrumb { flex: 1; gap: 7px; white-space: nowrap; overflow: hidden; }.breadcrumb span, .breadcrumb b { display: none; }.breadcrumb strong { overflow: hidden; text-overflow: ellipsis; }.circle-action { width: 31px; height: 31px; }.course-hero { min-height: 250px; padding: 29px 22px; }.course-hero h1 { font-size: 27px; }.hero-copy > p { font-size: 11px; }.desktop-break { display: none; }.hero-art { width: 250px; height: 190px; right: -24px; top: 38px; opacity: .45; }.hero-progress { left: 22px; right: auto; bottom: 24px; width: 190px; }.hero-progress p { text-align: left; }.mobile-course-title { display: none; }.content-wrap { padding: 0 17px 50px; }.tabbar { height: 66px; gap: 13px; justify-content: space-between; }.tab { flex: 1; font-size: 11px; }.tab span { display: none; }.view { padding-top: 28px; }.section-heading h2 { font-size: 20px; }.section-heading { margin-bottom: 17px; }.notice-card { padding: 15px; }.notice-card p:last-of-type { padding-right: 10px; }.composer-card { padding: 13px; }.composer-card > .avatar { width: 32px; height: 32px; font-size: 12px; }.composer-actions { align-items: end; }.composer-tools { display: none; }.post-card { padding: 16px 15px 12px; }.post-body { font-size: 11px; line-height: 1.85; }.contents-intro { padding: 20px; }.contents-intro h3 { font-size: 17px; }.mini-progress { width: 65px; height: 65px; }.overview-grid { grid-template-columns: 1fr; }.overview-main, .overview-facts { padding: 20px; }.info-row { padding: 15px; display: grid; gap: 13px; }.info-row > div, .info-row > div:first-child { border-right: 0; border-bottom: 1px solid #edf3f6; padding: 0 0 11px; }.info-row > div:last-child { border: 0; padding-bottom: 0; }.lesson-card { gap: 10px; padding: 13px 12px; }.lesson-number { width: 23px; font-size: 18px; }.lesson-copy strong { font-size: 11px; }.lesson-copy em { font-size: 8px; }.lesson-arrow { display: none; } }