:root {
  --ink: #14221f;
  --muted: #70807b;
  --line: #dbe5df;
  --paper: #f7faf8;
  --card: #ffffff;
  --green: #13785e;
  --green-dark: #0d4d3e;
  --lime: #d8f16d;
  --yellow: #f6ba45;
  --coral: #e97958;
  --shadow: 0 18px 50px rgb(21 44 36 / 10%);
  color: var(--ink);
  background: var(--paper);
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { min-height: 100vh; margin: 0; background: var(--paper); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid rgb(19 120 94 / 28%); outline-offset: 3px; }
button:disabled { cursor: not-allowed; opacity: .42; }
a { color: inherit; text-decoration: none; }

.site-shell { min-height: 100vh; overflow: hidden; background: radial-gradient(circle at 75% -8%, rgb(216 241 109 / 28%), transparent 27rem), var(--paper); }
.topbar { display: flex; align-items: center; justify-content: space-between; min-height: 74px; width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; }
.brand em { display: inline-block; margin-left: 4px; color: var(--green); font-size: 11px; font-style: normal; font-weight: 700; letter-spacing: .02em; }
.brand-mark { display: grid; place-items: center; width: 31px; height: 31px; color: var(--green-dark); background: var(--lime); border-radius: 9px; box-shadow: 4px 4px 0 var(--green-dark); font-family: Arial, sans-serif; font-size: 18px; font-weight: 800; transform: rotate(-7deg); }
.topbar-note, .platform-pill { color: var(--muted); font-size: 12px; font-weight: 700; }
.platform-pill { padding: 7px 10px; color: var(--green-dark); background: #e7f5dc; border: 1px solid #c7dfb7; border-radius: 999px; }
.back-home { padding: 8px 0; color: var(--muted); background: transparent; border: 0; cursor: pointer; font-size: 13px; font-weight: 700; }
.back-home:hover { color: var(--green); }
.brand.compact { position: absolute; left: 50%; transform: translateX(-50%); }

.home-hero { display: grid; grid-template-columns: minmax(0, 1fr) 310px; align-items: center; gap: clamp(30px, 7vw, 110px); width: min(1160px, calc(100% - 40px)); min-height: 360px; margin: 0 auto; padding: 36px 0 44px; }
.eyebrow, .step-label { display: block; color: var(--green); font-family: Arial, sans-serif; font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.home-hero h1 { max-width: 650px; margin: 14px 0 18px; font-size: clamp(38px, 6vw, 66px); line-height: 1.14; letter-spacing: 0; }
.home-hero h1 span { color: var(--green); }
.home-hero p { max-width: 510px; margin: 0; color: var(--muted); font-size: 16px; line-height: 1.85; }
.hero-art { position: relative; display: grid; place-items: center; min-height: 270px; color: var(--green-dark); font-family: Arial, sans-serif; font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.hero-art img { position: relative; z-index: 2; width: 164px; height: 164px; object-fit: cover; border: 10px solid white; border-radius: 42px; box-shadow: 0 24px 45px rgb(18 73 57 / 20%); animation: float 5s ease-in-out infinite; }
.hero-art span { position: relative; z-index: 2; margin-top: 16px; }
.sun-ring { position: absolute; width: 244px; height: 244px; border: 1px solid rgb(19 120 94 / 17%); border-radius: 50%; box-shadow: 0 0 0 32px rgb(216 241 109 / 18%), 0 0 0 64px rgb(246 186 69 / 12%); animation: breathe 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0) rotate(2deg); } 50% { transform: translateY(-10px) rotate(-2deg); } }
@keyframes breathe { 0%, 100% { transform: scale(.96); opacity: .6; } 50% { transform: scale(1.04); opacity: 1; } }

.device-section { width: min(960px, calc(100% - 40px)); margin: 0 auto; padding: 10px 0 30px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 17px; }
.section-head h2 { margin: 5px 0 0; font-size: 20px; }
.section-count { color: var(--muted); font-family: Arial, sans-serif; font-size: 12px; font-weight: 700; }
.device-grid { display: grid; grid-template-columns: 1fr; gap: 14px; width: min(100%, 760px); margin: 0 auto; }
.device-card { display: grid; grid-template-columns: 52px minmax(0, 1fr) 20px; align-items: center; gap: 13px; min-height: 86px; padding: 16px 18px; color: var(--ink); text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 5px 0 rgb(20 34 31 / 5%); cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.device-card:hover { border-color: var(--green); box-shadow: 0 10px 0 rgb(20 34 31 / 7%); transform: translateY(-4px); }
.device-icon { display: grid; place-items: center; width: 52px; height: 52px; background: #e4f3c5; border: 1px solid #cbe19f; border-radius: 16px; box-shadow: inset 0 1px 0 rgb(255 255 255 / 75%), 0 5px 12px rgb(20 34 31 / 8%); }
.device-icon img { display: block; width: 37px; height: 37px; }
.apple-card .device-icon { background: #edf0f4; border-color: #d5dce4; }
.device-card strong, .device-card small { display: block; }
.device-card strong { font-size: 16px; }
.device-card small { margin-top: 6px; color: var(--muted); font-size: 12px; }
.card-arrow { color: var(--green); font-family: Arial, sans-serif; font-size: 22px; }
.custom-guide-card { display: grid; grid-template-columns: 52px minmax(0, 1fr) 20px; align-items: center; gap: 13px; width: min(100%, 760px); min-height: 86px; margin: 14px auto 0; padding: 16px 18px; color: var(--ink); text-align: left; background: #fffdf3; border: 1px solid #ead9a2; border-radius: 16px; box-shadow: 0 5px 0 rgb(20 34 31 / 5%); cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.custom-guide-card:hover { border-color: var(--yellow); box-shadow: 0 10px 0 rgb(20 34 31 / 7%); transform: translateY(-3px); }
.custom-guide-mark { display: grid; place-items: center; width: 52px; height: 52px; color: #7b5513; background: #ffe39c; border: 1px solid #f1c96a; border-radius: 16px; font-size: 12px; font-weight: 800; }
.custom-guide-card strong, .custom-guide-card small { display: block; }
.custom-guide-card strong { font-size: 16px; }
.custom-guide-card small { margin-top: 6px; color: var(--muted); font-size: 12px; }
.tutorial-main { width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 26px 0 64px; }
.progress-summary { display: grid; gap: 9px; margin-bottom: 22px; }
.progress-summary > div:first-child { display: flex; justify-content: space-between; align-items: center; color: var(--muted); }
.progress-summary strong { color: var(--green); font-family: Arial, sans-serif; font-size: 13px; }
.progress-track { height: 5px; overflow: hidden; background: #e2ebe5; border-radius: 99px; }
.progress-track span { display: block; height: 100%; background: var(--green); border-radius: inherit; transition: width .45s cubic-bezier(.2,.8,.2,1); }
.progress-percent-17 { width: 17%; }
.progress-percent-25 { width: 25%; }
.progress-percent-33 { width: 33%; }
.progress-percent-50 { width: 50%; }
.progress-percent-67 { width: 67%; }
.progress-percent-75 { width: 75%; }
.progress-percent-83 { width: 83%; }
.progress-percent-100 { width: 100%; }
.tutorial-layout { display: block; }
.progress-rail { display: grid; gap: 0; margin-bottom: 22px; padding: 2px 0 22px; }
.progress-rail.progress-count-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.progress-rail.progress-count-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.progress-rail.progress-count-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.rail-item { position: relative; display: grid; grid-template-rows: 29px minmax(29px, auto); justify-items: center; align-items: start; min-width: 0; color: #9baaa3; text-align: center; }
.rail-item:not(:last-child)::after { position: absolute; z-index: 0; top: 13px; left: 50%; width: 100%; height: 2px; background: #dbe5df; content: ''; }
.rail-item.passed:not(:last-child)::after { background: #cbe19f; }
.rail-item span { position: relative; z-index: 1; display: grid; place-items: center; width: 27px; height: 27px; color: #8b9c94; background: #edf2ee; border: 1px solid #d8e3db; border-radius: 50%; font-family: Arial, sans-serif; font-size: 10px; font-weight: 700; }
.rail-item small { width: 100%; max-width: 112px; margin-top: 7px; overflow-wrap: anywhere; font-size: 11px; line-height: 1.35; }
.rail-item.active { color: var(--green-dark); font-weight: 800; }
.rail-item.active span { color: white; background: var(--green); border-color: var(--green); box-shadow: 0 0 0 5px rgb(19 120 94 / 12%); }
.rail-item.passed span { color: var(--green); background: #e4f3c5; border-color: #cbe19f; }
.step-card { min-width: 0; overflow: hidden; background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.step-enter { animation: stepIn .35s ease both; }
@keyframes stepIn { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: translateY(0); } }
.step-card-heading { display: grid; grid-template-columns: 53px minmax(0, 1fr); gap: 16px; padding: 31px 33px 24px; border-bottom: 1px solid var(--line); }
.step-number { display: grid; place-items: center; width: 53px; height: 53px; color: var(--green-dark); background: var(--lime); border-radius: 15px; font-family: Arial, sans-serif; font-size: 19px; font-weight: 800; }
.step-card h1 { margin: 7px 0 7px; font-size: clamp(24px, 4vw, 33px); line-height: 1.25; }
.step-card-heading p { max-width: 580px; margin: 0; color: var(--muted); line-height: 1.7; }
.step-content { display: grid; gap: 19px; padding: 27px 33px 31px; }
.copy { margin: 0; color: #40504a; line-height: 1.8; }
.notice { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; padding: 14px 15px; border-left: 3px solid; border-radius: 8px; font-size: 13px; line-height: 1.6; }
.notice strong { font-size: 12px; white-space: nowrap; }
.notice.cool { color: #295e57; background: #edf8f2; border-color: #42a979; }
.notice.warm { color: #815b1b; background: #fff6dc; border-color: var(--yellow); }
.notice.caution { color: #7c493a; background: #fff0eb; border-color: var(--coral); }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 43px; padding: 0 16px; border: 1px solid transparent; border-radius: 10px; font-size: 13px; font-weight: 800; cursor: pointer; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button.primary { color: white; background: var(--green); border-color: var(--green); box-shadow: 0 4px 0 #0b5b47; }
.button.primary:hover:not(:disabled) { background: #0f6a53; }
.button.secondary { color: var(--green-dark); background: white; border-color: #bcd1c3; }
.button.secondary:hover:not(:disabled) { border-color: var(--green); background: #f1f9ee; }
.button.text-button { min-height: 34px; padding: 0; color: var(--green); background: transparent; border: 0; box-shadow: none; font-size: 12px; }
.button.text-button:hover:not(:disabled) { text-decoration: underline; transform: none; }
.button.glow-link { position: relative; min-height: 38px; padding: 0 13px; color: var(--green-dark); background: #eff9e7; border: 1px solid #a8d8b7; border-radius: 10px; box-shadow: 0 0 0 0 rgb(19 120 94 / 0%); text-decoration: none; animation: glowPulse 2.8s ease-in-out infinite; }
.button.glow-link:hover:not(:disabled) { color: var(--green-dark); background: #e9f6df; border-color: #83c798; text-decoration: none; transform: translateY(-1px); }
@keyframes glowPulse { 0%, 100% { box-shadow: 0 0 0 0 rgb(19 120 94 / 0%); } 50% { box-shadow: 0 0 16px 3px rgb(19 120 94 / 22%); } }
.button-arrow { font-family: Arial, sans-serif; font-size: 17px; line-height: 1; }
.guide-media { max-width: 720px; margin: 0; overflow: hidden; background: #f2f5f3; border: 1px solid #e2eae4; border-radius: 12px; }
.guide-media img { display: block; width: 100%; max-height: 530px; object-fit: contain; }
.guide-media figcaption { padding: 8px 11px 10px; color: var(--muted); font-size: 11px; line-height: 1.5; }
.media-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.media-grid .guide-media { align-self: start; }
.profile-install-gallery .guide-media:first-child { max-width: 160px; }
.steps-mini { display: grid; gap: 8px; }
.steps-mini > div { display: grid; grid-template-columns: 27px minmax(0, 1fr); align-items: center; gap: 10px; min-height: 42px; padding: 7px 11px; color: #42524c; background: #f6f9f6; border: 1px solid #e4ece6; border-radius: 8px; font-size: 13px; }
.steps-mini b, .fallback-steps b { display: grid; place-items: center; width: 25px; height: 25px; color: var(--green-dark); background: var(--lime); border-radius: 7px; font-family: Arial, sans-serif; font-size: 11px; }
.download-box { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px; padding: 15px; background: #f1f8ed; border: 1px solid #cfe3bd; border-radius: 12px; }
.download-box.is-done { background: #ecf8f0; border-color: #a8d6b6; }
.download-file { display: flex; align-items: center; min-width: 0; gap: 11px; }
.file-mark { display: grid; flex: 0 0 auto; place-items: center; width: 42px; height: 42px; color: var(--green-dark); background: var(--lime); border-radius: 10px; font-family: Arial, sans-serif; font-size: 10px; font-weight: 800; }
.download-file strong, .download-file small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.download-file strong { font-size: 13px; }
.download-file small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.download-missing, .locked-hint { margin: 0; color: #8c6a22; font-size: 12px; line-height: 1.6; }
.check-row { display: flex; align-items: flex-start; gap: 10px; padding: 13px 14px; color: #3e4f47; background: #f8fbf7; border: 1px solid #dce8dc; border-radius: 10px; cursor: pointer; font-size: 13px; line-height: 1.6; }
.check-row input { flex: 0 0 auto; width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--green); }
.check-row.important { position: relative; padding: 15px 14px; color: #5c461a; background: #fff9df; border: 2px solid #e6b443; box-shadow: 0 0 0 4px rgb(230 180 67 / 12%); animation: checkPulse 2.8s ease-in-out infinite; }
.check-row.important input { width: 21px; height: 21px; accent-color: #c88912; }
.required-mark { display: inline-block; margin-right: 6px; padding: 2px 6px; color: white; background: #c88912; border-radius: 5px; font-size: 11px; font-weight: 800; line-height: 1.35; }
@keyframes checkPulse { 0%, 100% { box-shadow: 0 0 0 4px rgb(230 180 67 / 12%); } 50% { box-shadow: 0 0 0 7px rgb(230 180 67 / 18%); } }
.profile-ready { display: grid; gap: 9px; }
.finish-check { display: flex; align-items: center; gap: 13px; padding: 17px; background: #f1f8ed; border: 1px solid #cfe3bd; border-radius: 12px; }
.check-dot { display: grid; flex: 0 0 auto; place-items: center; width: 42px; height: 42px; color: var(--green-dark); background: var(--lime); border-radius: 50%; font-size: 23px; font-weight: 800; }
.finish-check strong, .finish-check small { display: block; }
.finish-check small { margin-top: 4px; color: var(--muted); font-size: 12px; }
.support-strip { display: flex; align-items: center; gap: 10px; padding: 13px 15px; background: var(--green-dark); border-radius: 10px; color: white; }
.support-strip span { color: #b9d9cc; font-size: 12px; }
.support-strip strong { font-family: Arial, sans-serif; font-size: 18px; letter-spacing: .05em; }
.support-strip .text-button { margin-left: auto; color: var(--lime); }
.step-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 33px 25px; border-top: 1px solid var(--line); }
.next-button { min-width: 210px; }
.choice-card { max-width: 700px; margin: 7vh auto 0; padding: 38px; background: white; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); animation: stepIn .35s ease both; }
.choice-card h1 { margin: 12px 0 11px; font-size: clamp(26px, 5vw, 40px); }
.choice-card > p { margin: 0; color: var(--muted); line-height: 1.8; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; margin-top: 25px; }
.choice-button { min-height: 100px; padding: 17px; color: var(--ink); text-align: left; background: #fafcf9; border: 1px solid #dbe5df; border-radius: 12px; cursor: pointer; transition: .2s ease; }
.choice-button:hover { border-color: var(--green); background: #f1f8ed; transform: translateY(-3px); }
.choice-button.done { background: #eff8e5; border-color: #c7dfa8; }
.choice-button strong, .choice-button span { display: block; }
.choice-button strong { font-size: 14px; }
.choice-button span { margin-top: 9px; color: var(--muted); font-size: 12px; }
.small-note { margin-top: 23px; color: var(--muted); font-size: 11px; }

.modal-backdrop { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; overflow: auto; padding: 22px; background: rgb(9 28 22 / 56%); backdrop-filter: blur(7px); animation: fadeIn .2s ease both; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-card { position: relative; width: min(530px, 100%); max-height: min(760px, calc(100vh - 36px)); overflow: auto; padding: 31px; background: white; border: 1px solid #dbe5df; border-radius: 17px; box-shadow: 0 30px 90px rgb(0 0 0 / 25%); animation: modalIn .25s ease both; }
@keyframes modalIn { from { opacity: 0; transform: translateY(12px) scale(.98); } to { opacity: 1; transform: none; } }
.modal-close { position: absolute; top: 15px; right: 15px; display: grid; place-items: center; width: 34px; height: 34px; color: var(--muted); background: transparent; border: 0; border-radius: 50%; cursor: pointer; font-size: 25px; line-height: 1; }
.modal-close:hover { background: #eef5ef; }
.modal-icon { display: grid; place-items: center; width: 40px; height: 40px; margin-bottom: 15px; color: var(--green-dark); background: var(--lime); border-radius: 12px; font-family: Arial, sans-serif; font-size: 21px; font-weight: 800; }
.modal-card h2 { margin: 8px 0 8px; font-size: 25px; }
.modal-card > p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.verify-modal form { display: grid; gap: 12px; margin-top: 20px; }
.math-question { padding: 15px; color: var(--green-dark); background: #eff8e5; border-radius: 10px; text-align: center; font-family: Arial, sans-serif; font-size: 28px; font-weight: 800; letter-spacing: .04em; }
.verify-modal input { width: 100%; height: 46px; padding: 0 14px; border: 1px solid #cfded2; border-radius: 9px; outline: 0; text-align: center; }
.verify-modal input:focus { border-color: var(--green); }
.full { width: 100%; }
.form-error { padding: 10px; color: #a04432; background: #fff0eb; border-radius: 8px; font-size: 12px; }
.download-success { display: grid; gap: 11px; margin-top: 21px; text-align: center; }
.success-mark { display: grid; place-items: center; width: 52px; height: 52px; margin: 0 auto 4px; color: var(--green-dark); background: var(--lime); border-radius: 50%; font-size: 28px; font-weight: 800; }
.download-success strong { font-size: 20px; }
.download-success p { margin: 0 0 5px; color: var(--muted); font-size: 12px; line-height: 1.7; }
.modal-footnote { margin-top: 18px; color: var(--muted); font-size: 11px; overflow-wrap: anywhere; }
.support-number { display: flex; align-items: center; gap: 10px; margin: 20px 0 13px; padding: 12px 14px; color: white; background: var(--green-dark); border-radius: 10px; }
.support-number span { color: #b9d9cc; font-size: 12px; }
.support-number strong { font-family: Arial, sans-serif; font-size: 17px; letter-spacing: .05em; }
.support-number .text-button { margin-left: auto; color: var(--lime); }
.fallback-box { display: grid; gap: 5px; margin: 16px 0; padding: 15px; background: #fff6dc; border: 1px solid #f1d38d; border-radius: 10px; }
.fallback-box span { color: #684d1f; font-weight: 800; }
.fallback-box small { color: #8c6a22; font-size: 11px; }
.fallback-steps { display: grid; gap: 8px; margin: 18px 0; }
.fallback-steps > div { display: grid; grid-template-columns: 25px minmax(0, 1fr); align-items: center; gap: 9px; color: #3e4f47; font-size: 12px; line-height: 1.55; }
.support-modal .media-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 16px; }
.support-modal .guide-media figcaption { display: none; }
.support-modal .fallback-media-grid .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-template-areas: "folder open" "folder save" "files dialog"; align-items: start; }
.support-modal .fallback-media-grid .guide-media:nth-child(1) { grid-area: folder; }
.support-modal .fallback-media-grid .guide-media:nth-child(2) { grid-area: open; }
.support-modal .fallback-media-grid .guide-media:nth-child(3) { grid-area: save; }
.support-modal .fallback-media-grid .guide-media:nth-child(4) { grid-area: files; }
.support-modal .fallback-media-grid .guide-media:nth-child(5) { grid-area: dialog; }
.modal-actions { display: flex; justify-content: flex-end; margin-top: 22px; }
.confirm-actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 10px; margin-top: 23px; }

@media (max-width: 760px) {
  .topbar { min-height: 63px; width: calc(100% - 28px); }
  .brand em, .topbar-note { display: none; }
  .brand.compact { position: static; transform: none; }
  .tutorial-main { width: calc(100% - 28px); padding-top: 20px; }
  .home-hero { grid-template-columns: minmax(0, 1fr) 150px; gap: 15px; width: calc(100% - 28px); min-height: 290px; padding: 26px 0 32px; }
  .home-hero h1 { font-size: clamp(30px, 8vw, 48px); }
  .home-hero p { font-size: 13px; line-height: 1.7; }
  .hero-art { min-height: 180px; }
  .hero-art img { width: 106px; height: 106px; border-width: 7px; border-radius: 28px; }
  .hero-art span { margin-top: 10px; font-size: 10px; }
  .sun-ring { width: 150px; height: 150px; box-shadow: 0 0 0 19px rgb(216 241 109 / 18%), 0 0 0 38px rgb(246 186 69 / 12%); }
  .device-section { width: calc(100% - 28px); }
  .device-grid, .choice-grid { grid-template-columns: 1fr; }
  .tutorial-layout { display: block; }
  .progress-rail { margin-bottom: 17px; padding: 0 0 17px; }
  .rail-item small { max-width: 58px; margin-top: 6px; font-size: 9px; line-height: 1.3; }
  .step-card-heading { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; padding: 23px 19px 20px; }
  .step-number { width: 44px; height: 44px; border-radius: 12px; font-size: 16px; }
  .step-content { padding: 21px 19px 23px; }
  .step-footer { padding: 15px 19px 20px; }
  .next-button { min-width: 0; flex: 1; }
  .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .profile-install-gallery .media-grid { grid-template-columns: 1fr; }
  .download-box { grid-template-columns: 1fr; }
  .download-trigger { width: 100%; }
  .choice-card { margin-top: 4vh; padding: 24px 19px; }
  .modal-backdrop { padding: 12px; }
  .modal-card { padding: 25px 18px 20px; border-radius: 14px; }
  .support-modal .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}