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env(safe-area-inset-left))}.app-header{min-height:58px}.app-header-tools{gap:6px}.display-mode-switch{min-height:46px;padding-left:6px}.display-mode-switch-label{display:none}.display-mode-button{min-width:52px;min-height:34px;padding-inline:7px}.midi-status-copy{min-width:80px}.home-hero{grid-template-columns:1fr .82fr}.hero-copy{padding:30px 25px}.hero-illustration{min-height:280px}.music-bubble{width:135px;height:135px}.music-bubble svg{width:70px}.quiz-card{padding-inline:20px}.progress-dots span{width:14px}.progress-dots span.is-current{width:23px}}@media (orientation:portrait){.portrait-guard{z-index:100;background:linear-gradient(145deg,#e9f7ff,#effbf4);place-items:center;width:100%;min-height:100dvh;padding:24px;display:grid;position:fixed;inset:0}.portrait-guard-card{border:1px solid var(--otopon-line);box-shadow:var(--otopon-shadow);text-align:center;background:#ffffffe6;border-radius:27px;flex-direction:column;align-items:center;gap:9px;padding:32px 28px;display:flex}.portrait-phone{border:5px solid var(--otopon-blue);width:74px;height:74px;color:var(--otopon-blue-deep);border-radius:21px;place-items:center;font-size:2.6rem;font-weight:900;display:grid;transform:rotate(90deg)}.portrait-guard-card strong{margin-top:8px;font-family:Zen Maru Gothic,sans-serif;font-size:1.3rem;font-weight:900}.portrait-guard-card>span:last-child{color:var(--otopon-ink-soft);font-size:.85rem;font-weight:700}}@media (height<=650px) and (orientation:landscape){.otopon-app{padding-top:8px}.app-header{min-height:52px}.app-main{padding-top:14px}.home-hero,.hero-illustration{min-height:245px}.hero-copy{padding-top:27px;padding-bottom:22px}.hero-description{margin-top:9px;line-height:1.5}.music-bubble{width:130px;height:130px;top:46px}.sun-orb{width:94px;height:94px;top:16px}.mode-section{margin-top:14px;padding-block:17px}.mode-card{min-height:75px;padding-block:10px}.mode-icon{flex-basis:48px;width:48px;height:48px}.mode-icon svg{width:27px}.home-tips{padding-top:9px}.quiz-card{min-height:395px;margin-top:10px}.quiz-stage{min-height:240px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}