:root { --ink: #11120f; --paper: #f5f5ef; --muted: #6f7169; --line: #d9dad2; --blue: #305ef2; --lime: #c7f36a; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: inherit; text-decoration: none; }

.nav { height: 84px; max-width: 1240px; margin: 0 auto; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 13px; font-weight: 800; letter-spacing: .16em; }
.brand-mark { position: relative; width: 38px; height: 38px; display: grid; place-items: center; border: 1.5px solid var(--ink); border-radius: 50%; font-size: 14px; letter-spacing: 0; overflow: hidden; }
.brand-mark i { position: absolute; right: -4px; bottom: -4px; width: 17px; height: 17px; background: var(--lime); border: 1px solid var(--ink); transform: rotate(45deg); }
.nav-links { display: flex; align-items: center; gap: 34px; font-size: 14px; }
.nav-links > a:not(.nav-cta) { color: #55574f; transition: color .2s; }
.nav-links > a:not(.nav-cta):hover { color: var(--blue); }
.nav-auth { display: inline-flex; align-items: center; gap: 12px; }.nav-auth a { color: #55574f; transition: color .2s; }.nav-auth a:hover, .nav-account:hover { color: var(--blue); }.nav-register { border: 1px solid var(--ink); border-radius: 999px; padding: 7px 11px; color: var(--ink) !important; }.nav-account { color: #55574f; }
.nav-cta { background: var(--ink); color: white; border-radius: 999px; padding: 13px 18px 13px 20px; display: flex; gap: 18px; align-items: center; transition: transform .2s, background .2s; }
.nav-cta:hover { transform: translateY(-2px); background: var(--blue); }

.hero { position: relative; min-height: 500px; max-width: 1240px; margin: 0 auto; padding: 58px 28px 60px; display: grid; grid-template-columns: minmax(0, .85fr) minmax(440px, 1.15fr); align-items: center; gap: 72px; overflow: hidden; }
.hero::after { content: ""; position: absolute; left: 32%; top: 20%; width: 210px; height: 210px; border: 1px solid var(--line); border-radius: 50%; box-shadow: 0 0 0 38px var(--paper), 0 0 0 39px var(--line), 0 0 0 76px var(--paper), 0 0 0 77px var(--line); opacity: .55; z-index: -1; }
.hero-kicker, .eyebrow { font-size: 11px; font-weight: 700; letter-spacing: .18em; color: #696b63; }
.hero-kicker { display: flex; align-items: center; gap: 10px; }
.hero-kicker span { width: 22px; height: 1px; background: var(--blue); }
.hero h1 { margin: 25px 0 24px; max-width: 560px; font-size: clamp(54px, 6vw, 82px); line-height: 1; letter-spacing: -.07em; font-weight: 760; }
.hero h1 em { font-family: Georgia, "Noto Serif SC", serif; font-weight: 400; color: var(--blue); }
.hero-copy > p { margin: 0; font-size: 15px; line-height: 1.8; color: var(--muted); }
.quick-tools { display: grid; gap: 14px; }
.quick-tool { position: relative; min-height: 158px; padding: 25px 58px 24px 25px; display: grid; grid-template-columns: 34px 1fr; gap: 18px; align-items: start; border: 1px solid rgba(17,18,15,.12); border-radius: 22px; overflow: hidden; transition: transform .2s, box-shadow .2s; }
.quick-tool::after { content: ""; position: absolute; right: -35px; bottom: -52px; width: 128px; height: 128px; border: 1px solid rgba(17,18,15,.15); border-radius: 50%; box-shadow: 0 0 0 22px transparent, 0 0 0 23px rgba(17,18,15,.08); }
.quick-blue { background: #e9edff; }.quick-lime { background: var(--lime); }
.quick-tool:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(17,18,15,.1); }
.quick-index { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid rgba(17,18,15,.22); border-radius: 50%; font: italic 11px Georgia, serif; }
.quick-tool small { display: block; margin: 2px 0 7px; font-size: 10px; letter-spacing: .1em; color: #6d7066; }
.quick-tool strong { display: block; font-size: 27px; letter-spacing: -.04em; }
.quick-tool p { margin: 11px 0 0; font-size: 12px; color: #62655c; }
.quick-arrow { position: absolute; right: 22px; top: 22px; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--ink); font-size: 17px; z-index: 1; transition: transform .2s; }
.quick-tool:hover .quick-arrow { transform: translate(3px, -3px); }

.tools-section { background: var(--ink); color: white; padding: 110px max(28px, calc((100vw - 1184px) / 2)); }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 58px; }
.section-heading h2 { margin: 12px 0 0; font-size: clamp(36px, 5vw, 62px); letter-spacing: -.05em; }
.section-heading p { margin: 0 0 8px; color: #999b94; font-size: 14px; }
.tools-list { display: grid; gap: 28px; }
.tool-card { min-height: 520px; border-radius: 28px; overflow: hidden; display: grid; grid-template-columns: minmax(320px, .82fr) 1.18fr; color: var(--ink); }
.accent-blue { background: #eef1ff; }
.accent-lime { background: #eff5de; }
.tool-copy { padding: 54px 20px 48px 52px; display: flex; flex-direction: column; align-items: flex-start; z-index: 1; }
.tool-meta { width: 100%; display: flex; gap: 13px; align-items: center; font-size: 11px; font-weight: 700; letter-spacing: .1em; color: #6b6d66; }
.tool-meta span:first-child { color: var(--ink); border-right: 1px solid #b9bbb2; padding-right: 13px; }
.tool-copy h3 { font-size: clamp(41px, 4.5vw, 66px); line-height: 1; letter-spacing: -.065em; margin: 58px 0 20px; }
.tool-summary { max-width: 410px; font-family: Georgia, "Noto Serif SC", serif; font-size: 22px; line-height: 1.55; margin: 0 0 16px; }
.tool-description { max-width: 430px; color: #64675e; font-size: 14px; line-height: 1.85; margin: 0; }
.tool-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 28px 0 34px; list-style: none; }
.tool-tags li { border: 1px solid #cbcdc3; border-radius: 999px; padding: 8px 12px; font-size: 11px; color: #53554e; }
.tool-link { margin-top: auto; display: inline-flex; align-items: center; gap: 16px; border-bottom: 1px solid var(--ink); padding: 0 2px 8px; font-weight: 700; font-size: 14px; }
.arrow { display: inline-block; font-size: 18px; transition: transform .2s; }
.tool-link:hover .arrow { transform: translate(3px, -3px); }

.tool-visual { position: relative; min-height: 520px; overflow: hidden; }
.timetable-visual { background: var(--blue); padding: 54px 0 0 56px; }
.visual-topbar { width: 680px; height: 52px; background: #fff; border-radius: 14px 0 0; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; }
.mini-brand { width: 26px; height: 26px; border-radius: 8px; color: white; background: var(--blue); display: grid; place-items: center; font-size: 9px; font-weight: 800; }
.visual-topbar div { display: flex; gap: 6px; }
.visual-topbar i { width: 6px; height: 6px; border-radius: 50%; background: #d9dce8; }
.schedule-shell { width: 680px; height: 440px; display: grid; grid-template-columns: 62px 1fr; background: #f8f9ff; }
.schedule-side { padding: 34px 19px; display: flex; flex-direction: column; gap: 24px; border-right: 1px solid #e8e9ef; background: white; }
.schedule-side span { width: 22px; height: 6px; border-radius: 5px; background: #dfe1e8; }
.schedule-side .active { height: 22px; background: #dce3ff; }
.schedule-main { padding: 32px 36px; }
.schedule-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
.schedule-heading b { font-size: 16px; }
.schedule-heading span { padding: 7px 12px; font-size: 9px; background: white; border-radius: 8px; color: #777a84; }
.schedule-days { display: grid; grid-template-columns: repeat(4, 1fr); font-size: 8px; color: #9699a3; text-align: center; padding: 0 4px 10px; }
.schedule-grid { height: 260px; position: relative; border-radius: 10px; background-image: linear-gradient(#e4e6ef 1px, transparent 1px), linear-gradient(90deg, #e4e6ef 1px, transparent 1px); background-size: 100% 65px, 25% 100%; }
.schedule-cell { position: absolute; width: 21%; height: 52px; border-radius: 8px; padding: 9px 10px; display: flex; flex-direction: column; font-size: 10px; box-shadow: 0 5px 12px rgba(37,44,91,.08); }
.schedule-cell small { margin-top: 3px; opacity: .6; font-size: 8px; }
.cell-1 { top: 7px; left: 2%; }.cell-2 { top: 72px; left: 27%; }.cell-3 { top: 137px; left: 52%; }
.blue { background: #dce4ff; color: #2748b9; }.violet { background: #eee0ff; color: #7544a8; }.orange { background: #ffe7cf; color: #a45b24; }
.floating-check { position: absolute; left: 30px; bottom: 31px; background: white; border-radius: 14px; padding: 14px 20px 14px 14px; display: flex; align-items: center; gap: 12px; box-shadow: 0 14px 40px rgba(20,28,78,.24); }
.floating-check > span { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: #dff5b5; font-size: 13px; }
.floating-check div { display: flex; flex-direction: column; gap: 3px; }.floating-check b { font-size: 10px; }.floating-check small { font-size: 8px; color: #81837b; }

.words-visual { background: var(--lime); display: grid; place-items: center; }
.phone { position: relative; width: 270px; height: 440px; padding: 16px 18px 20px; background: #fbfbf7; border: 7px solid var(--ink); border-radius: 34px; box-shadow: 20px 26px 0 rgba(17,18,15,.12); z-index: 2; transform: rotate(1.5deg); }
.phone-bar { display: flex; justify-content: space-between; padding: 0 5px 20px; font-size: 8px; font-weight: 700; }.phone-bar i { width: 42px; height: 5px; border-radius: 9px; background: var(--ink); }
.word-progress { display: flex; justify-content: space-between; align-items: center; font-size: 9px; color: #72746c; padding-bottom: 14px; border-bottom: 4px solid #e2e6d9; }
.word-progress b { color: var(--ink); }.word-progress::after { content: ""; position: absolute; left: 18px; top: 70px; width: 55%; height: 4px; background: var(--blue); border-radius: 4px; }
.word-card { min-height: 247px; display: flex; align-items: center; flex-direction: column; text-align: center; justify-content: center; }
.word-card small { color: #8c8f85; font-size: 7px; letter-spacing: .14em; }.word-card strong { font-family: Georgia, serif; font-size: 27px; margin: 15px 0 6px; letter-spacing: -.04em; }.word-card em { font-size: 9px; color: #777a70; }.word-card p { width: 90%; margin: 24px 0 0; padding-top: 17px; border-top: 1px solid #e2e3dc; font-size: 10px; }
.word-actions { display: grid; grid-template-columns: .75fr 1.25fr; gap: 8px; font-size: 9px; text-align: center; }.word-actions span, .word-actions b { padding: 12px 6px; border-radius: 11px; border: 1px solid #d9dbd1; }.word-actions b { color: white; background: var(--ink); border-color: var(--ink); }
.word-orbit { position: absolute; border: 1px solid rgba(17,18,15,.22); border-radius: 50%; }.orbit-one { width: 480px; height: 480px; }.orbit-two { width: 620px; height: 620px; }
.streak-card { position: absolute; z-index: 3; right: 48px; top: 84px; width: 112px; height: 106px; padding: 19px; color: white; background: var(--blue); border-radius: 19px; transform: rotate(6deg); box-shadow: 0 15px 30px rgba(28,52,137,.2); }.streak-card b { display: block; font: 34px Georgia, serif; }.streak-card span { font-size: 9px; opacity: .85; }.spark { position: absolute; left: 50px; bottom: 68px; font-size: 42px; }

.principle-section { max-width: 1184px; margin: 0 auto; padding: 120px 0 130px; }
.principle-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 80px; margin-top: 36px; }
.principle-grid h2 { margin: 0; max-width: 700px; font-size: clamp(40px, 5.5vw, 68px); line-height: 1.2; letter-spacing: -.055em; }
.principle-list { border-top: 1px solid var(--line); }.principle-list > div { display: grid; grid-template-columns: 42px 1fr; padding: 22px 0; border-bottom: 1px solid var(--line); }
.principle-list span { font: italic 13px Georgia, serif; color: var(--blue); }.principle-list p { margin: 0; font-size: 13px; color: #777970; }.principle-list b { display: block; margin-bottom: 6px; font-size: 16px; color: var(--ink); }
footer { min-height: 150px; max-width: 1240px; margin: 0 auto; padding: 45px 28px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; }
.footer-brand { justify-self: start; }footer p { justify-self: center; font-family: Georgia, "Noto Serif SC", serif; color: #696b63; }footer > span { justify-self: end; color: #96988f; font-size: 11px; }

@media (max-width: 900px) {
  .hero { min-height: auto; padding-top: 58px; grid-template-columns: 1fr; gap: 42px; }.hero::after { left: auto; right: -130px; }
  .quick-tools { grid-template-columns: 1fr 1fr; }.quick-tool { min-height: 172px; grid-template-columns: 1fr; }.quick-index { display: none; }
  .tool-card { grid-template-columns: 1fr; }.tool-copy { min-height: 500px; padding-right: 44px; }.tool-visual { min-height: 480px; }
  .principle-section { padding: 100px 28px; }.principle-grid { grid-template-columns: 1fr; gap: 55px; }
}
@media (max-width: 600px) {
  .nav { height: 66px; padding: 0 16px; }.nav .brand > span:last-child { display: none; }.nav-links { gap: 14px; font-size: 12px; }.nav-cta { display: none; }.brand-mark { width: 34px; height: 34px; }
  .hero { padding: 42px 18px 46px; gap: 30px; }.hero h1 { margin: 22px 0 18px; font-size: clamp(46px, 14vw, 64px); }.hero-copy > p { font-size: 13px; }.quick-tools { grid-template-columns: 1fr; gap: 11px; }.quick-tool { min-height: 124px; padding: 20px 54px 19px 20px; }.quick-tool strong { font-size: 24px; }.quick-tool p { margin-top: 7px; }
  .tools-section { padding: 80px 16px; }.section-heading { align-items: flex-start; }.section-heading > p { display: none; }.tool-card { border-radius: 22px; }.tool-copy { min-height: 480px; padding: 38px 26px; }.tool-copy h3 { margin-top: 42px; }.tool-summary { font-size: 19px; }.tool-visual { min-height: 410px; }
  .timetable-visual { padding: 38px 0 0 28px; }.visual-topbar, .schedule-shell { width: 590px; }.schedule-shell { height: 380px; }.schedule-main { padding: 28px 24px; }.floating-check { left: 18px; bottom: 22px; }
  .phone { transform: rotate(1.5deg) scale(.84); }.streak-card { right: 20px; top: 54px; transform: rotate(6deg) scale(.85); }.spark { left: 22px; }
  .principle-section { padding: 82px 20px; }.principle-grid { margin-top: 28px; }.principle-grid h2 { font-size: 40px; }
  footer { padding: 35px 20px; grid-template-columns: 1fr auto; }footer p { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }