:root{color-scheme:light;--bg: #f7f8f4;--surface: #ffffff;--surface-2: #eef3f1;--ink: #18201c;--muted: #637067;--line: #d9e0d9;--primary: #0f766e;--primary-dark: #0b5f59;--primary-ink: #ffffff;--accent: #b45309;--danger: #b42318;--danger-bg: #fff1f0;--shadow: 0 12px 28px rgba(24, 32, 28, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:var(--bg);color:var(--ink)}body.study-session-lock{overflow:hidden}button,input,select,textarea{font:inherit}button{-webkit-tap-highlight-color:transparent}button:disabled{cursor:not-allowed;opacity:.45}.app-shell{min-height:100vh}.brand{display:inline-flex;min-width:44px;min-height:44px;align-items:center;gap:9px;border:0;background:transparent;color:var(--ink);font-weight:800}.brand svg{width:24px;height:24px;color:var(--primary)}.brand img{width:28px;height:28px;flex:0 0 auto;border-radius:7px}.content{width:min(1080px,100%);margin:0 auto;padding:88px 16px 32px}.study-session-content{width:min(760px,100%);padding-bottom:128px}.login-screen{position:relative;display:grid;overflow:hidden;min-height:100dvh;place-content:center;gap:18px;padding:24px;isolation:isolate;text-align:center}.login-screen>:not(.login-card-drift){position:relative;z-index:1}.login-card-drift{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;overflow:hidden;pointer-events:none}.login-card-drift span{--from-rotate: -8deg;--to-rotate: 28deg;position:absolute;bottom:-150px;display:block;width:72px;height:46px;border:1px solid rgba(15,118,110,.12);border-radius:12px;background:#ffffff6b;box-shadow:0 14px 32px #0f766e14;opacity:0;transform:translateZ(0) rotate(var(--from-rotate));animation:login-card-float 28s linear infinite}.login-card-drift span:nth-child(1){left:6%;width:58px;height:38px;animation-delay:-8s;animation-duration:24s}.login-card-drift span:nth-child(2){left:18%;width:96px;height:62px;--from-rotate: 12deg;--to-rotate: -24deg;animation-delay:-18s;animation-duration:32s}.login-card-drift span:nth-child(3){left:31%;width:44px;height:30px;animation-delay:-4s;animation-duration:22s}.login-card-drift span:nth-child(4){left:43%;width:80px;height:52px;--from-rotate: -18deg;--to-rotate: 22deg;animation-delay:-14s;animation-duration:30s}.login-card-drift span:nth-child(5){left:58%;width:52px;height:34px;animation-delay:-22s;animation-duration:26s}.login-card-drift span:nth-child(6){left:72%;width:112px;height:70px;--from-rotate: 18deg;--to-rotate: -18deg;animation-delay:-10s;animation-duration:34s}.login-card-drift span:nth-child(7){left:85%;width:66px;height:42px;animation-delay:-28s;animation-duration:24s}.login-card-drift span:nth-child(8){left:12%;width:124px;height:78px;--from-rotate: -22deg;--to-rotate: 18deg;animation-delay:-32s;animation-duration:38s}.login-card-drift span:nth-child(9){left:50%;width:38px;height:26px;animation-delay:-26s;animation-duration:28s}.login-card-drift span:nth-child(10){left:78%;width:48px;height:32px;--from-rotate: 8deg;--to-rotate: 34deg;animation-delay:-2s;animation-duration:22s}@keyframes login-card-float{0%{opacity:0;transform:translateZ(0) rotate(var(--from-rotate))}12%{opacity:.36}78%{opacity:.22}to{opacity:0;transform:translate3d(0,calc(-100dvh - 220px),0) rotate(var(--to-rotate))}}.login-app-icon{width:96px;height:96px;justify-self:center;border-radius:22px;box-shadow:var(--shadow)}.login-screen h1{margin:0;font-size:30px;font-weight:900;line-height:1.1}.login-screen p{width:min(320px,100%);margin:-6px auto 8px;color:var(--muted);font-size:15px;font-weight:700;line-height:1.6}.login-button{min-width:168px;min-height:48px;justify-self:center}@media(prefers-reduced-motion:reduce){.login-card-drift span{animation:none;opacity:.1;transform:none}}.loading-screen{min-height:100vh;display:grid;place-items:center;gap:12px;color:var(--primary);font-weight:700}.loading-screen svg{width:42px;height:42px}.view-stack,.study-layout{display:grid;gap:16px}.section-header{position:fixed;top:0;left:50%;z-index:22;display:flex;width:min(1080px,100%);align-items:center;justify-content:space-between;gap:16px;margin:0;padding:12px 16px;border-bottom:1px solid var(--line);background:#f7f8f4f5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transform:translate(-50%)}.section-header>div:first-child{min-width:0}.section-actions{display:inline-flex;flex:0 0 auto;gap:8px}.section-actions .primary-button,.section-actions .secondary-button{padding:0}.account-menu{position:relative;display:inline-flex}.account-menu-button[aria-expanded=true]{border-color:var(--primary);color:var(--primary-dark)}.account-menu-popover{position:absolute;top:calc(100% + 8px);right:0;z-index:40;display:grid;width:min(280px,calc(100vw - 32px));gap:8px;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:var(--shadow)}.account-menu-popover>span{overflow:hidden;color:var(--muted);font-size:13px;font-weight:800;line-height:1.3;text-overflow:ellipsis;white-space:nowrap}.account-menu-popover>small{color:var(--muted);font-size:12px;font-weight:700;line-height:1.2}.account-menu-popover .secondary-button{width:100%;gap:8px;padding:0 12px}.account-menu-popover .secondary-button>span{display:inline}.eyebrow{margin:0 0 4px;color:var(--accent);font-size:12px;font-weight:800;letter-spacing:0;text-transform:uppercase}.panel,.deck-card,.study-card,.card-row{border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:var(--shadow)}.panel{padding:16px}.deck-grid{display:grid;gap:12px}.deck-card{display:grid;grid-template-columns:minmax(0,1fr) 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var(--line);background:#f7f8f4f5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transform:translate(-50%)}.back-text-button{display:inline-flex;min-width:44px;min-height:40px;align-items:center;justify-content:center;gap:0;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-size:13px;font-weight:800;padding:0}.back-text-button svg{width:18px;height:18px}.type-tile-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-self:start;gap:2px;height:42px;margin-top:4px;padding:4px;border:1px solid var(--line);border-radius:8px;background:var(--surface-2)}.type-tile-row button{height:32px;min-height:0;padding:0 8px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-size:13px;font-weight:800}.type-tile-row button.active{background:var(--primary);color:var(--primary-ink)}.compose-form{display:grid;align-content:start;gap:12px}.compose-form textarea{min-height:92px}.choice-compose-form 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72px;gap:6px;align-items:center}.choice-edit-row textarea{min-height:58px;padding:8px 10px;resize:vertical}.choice-correct-toggle{width:72px;height:58px;padding:0 4px;border:1px solid var(--line)}.choice-correct-toggle.correct{border-color:var(--primary);background:var(--primary);color:var(--primary-ink)}.choice-correct-toggle.wrong{background:var(--surface);color:var(--muted)}.matching-pair-list{display:grid;gap:7px}.matching-edit-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.matching-edit-row textarea{min-height:58px;padding:8px 10px;resize:vertical}.compose-action-bar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.compose-action-bar .primary-button,.compose-action-bar .secondary-button,.study-actions .primary-button,.study-actions .secondary-button,.split-actions .primary-button,.split-actions .secondary-button,.summary-actions .primary-button,.summary-actions .secondary-button{gap:8px;padding:0 14px}.compose-action-bar .primary-button>span,.compose-action-bar .secondary-button>span,.study-actions .primary-button>span,.study-actions .secondary-button>span,.split-actions .primary-button>span,.split-actions .secondary-button>span,.summary-actions .primary-button>span,.summary-actions .secondary-button>span,.import-panel .primary-button>span{display:inline;line-height:1}.import-panel .primary-button,.setup-panel .primary-button,.deck-edit-panel .primary-button.wide-action,.deck-edit-panel .secondary-button.wide-action{gap:8px;padding:0 14px}.setup-panel .primary-button>span,.deck-edit-panel .primary-button.wide-action>span,.deck-edit-panel .secondary-button.wide-action>span{display:inline;line-height:1}.library-header{display:grid;align-items:center;gap:12px}.library-header input{width:100%}.search-field{position:relative}.search-field 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var(--line);border-radius:8px;background:var(--surface);padding:6px}.card-main{display:grid;grid-template-columns:auto 1fr;gap:8px;min-width:0;min-height:58px;align-items:center;border:0;background:transparent;color:inherit;padding:0;text-align:left}.card-preview{display:grid;min-width:0;gap:3px}.card-preview strong,.card-preview span,.card-preview small{overflow:hidden;text-overflow:ellipsis}.card-preview strong{color:var(--ink);font-size:14px;line-height:1.25;white-space:nowrap}.card-preview>span{color:var(--muted);font-size:12px;line-height:1.25;white-space:nowrap}.card-preview small{font-size:10.5px;font-weight:800;line-height:1.2;white-space:nowrap}.review-timing.unset{color:var(--muted)}.review-timing.due{color:var(--accent)}.review-timing.scheduled{color:var(--primary-dark)}.card-item-actions{display:grid;place-items:center}.card-item-actions .icon-button{width:30px;height:30px;min-width:30px;min-height:30px}.card-item-actions .icon-button svg{width:16px;height:16px}.card-row{overflow:hidden}.card-row summary{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;min-height:56px;padding:0 14px;cursor:pointer;list-style:none}.card-row summary::-webkit-details-marker{display:none}.card-number{display:inline-grid;width:24px;height:24px;place-items:center;border-radius:999px;background:var(--surface-2);color:var(--primary-dark);font-size:11px;font-weight:800}.study-controls{display:grid;grid-template-columns:1fr auto;gap:10px}.setup-panel,.setting-group{display:grid;gap:12px}.setting-group>span{color:var(--muted);font-size:13px;font-weight:800}.deck-default-setting{gap:7px}.deck-default-setting .segmented-control{grid-template-columns:repeat(3,minmax(0,1fr))}.source-editor{gap:8px}.source-editor-header{display:flex;align-items:center;justify-content:space-between;gap:10px}.source-editor-header>span{color:var(--muted);font-size:13px;font-weight:800}.source-add-button{min-height:36px;min-width:82px}.source-editor-list{display:grid;gap:10px}.source-editor-item{display:grid;gap:8px;border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:10px}.source-editor-item-header{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px;align-items:center}.source-editor-item-header>span{display:inline-grid;width:24px;height:24px;place-items:center;border-radius:999px;background:var(--surface-2);color:var(--primary-dark);font-size:11px;font-weight:900}.source-editor-item-header select,.source-editor-item input{min-width:0}.source-editor-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.source-remove-button{width:36px;min-width:36px;height:36px;min-height:36px}.source-empty{margin:0;color:var(--muted);font-size:13px;font-weight:700}.deck-choice-count-tabs{width:100%}.danger-zone{display:grid;margin-top:6px;padding-top:14px;border-top:1px solid var(--line)}.study-setup .segmented-control{grid-template-columns:repeat(auto-fit,minmax(72px,1fr))}.study-session-layout{min-height:calc(100dvh - 44px)}.study-session-header{position:fixed;top:0;left:50%;z-index:22;display:grid;grid-template-columns:44px 1fr auto;width:min(1080px,100%);gap:12px;align-items:center;margin:0;padding:12px 16px;border-bottom:1px solid var(--line);background:#f7f8f4f5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transform:translate(-50%)}.study-session-content .compose-header,.study-session-content .study-session-header{width:min(760px,100%)}.study-session-header .count-pill{justify-self:center}.study-session-header-spacer{width:44px;height:44px}.study-session-frame{position:fixed;top:0;right:0;bottom:0;left:0;z-index:24;display:flex;flex-direction:column;background:var(--bg)}.study-session-frame .study-session-header{position:static;left:auto;flex:0 0 auto;width:min(760px,100%);margin:0 auto;transform:none}.study-session-scroll{flex:1 1 auto;width:100%;min-height:0;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;padding:16px 24px 24px;-webkit-overflow-scrolling:touch}.study-session-frame .study-session-layout{width:min(760px,100%);min-height:0;margin:0 auto}.study-session-frame .study-card{min-height:0}.study-summary-layout{min-height:calc(100dvh - 44px);align-content:start}.summary-panel{display:grid;gap:18px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:var(--shadow);padding:20px}.summary-panel h1{margin:-10px 0 0;font-size:32px;letter-spacing:0}.summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(96px,1fr));gap:8px}.summary-grid span{display:grid;gap:4px;min-height:72px;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--surface-2)}.summary-grid strong{color:var(--ink);font-size:24px;line-height:1}.summary-grid small{color:var(--muted);font-size:12px;font-weight:800}.segmented-control{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;min-height:44px;padding:4px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.segmented-control button{min-width:0;border:0;border-radius:6px;background:transparent;color:var(--muted);font-weight:800}.segmented-control button.active{background:var(--primary);color:var(--primary-ink)}.mini-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.mini-stats span{min-height:40px;display:grid;gap:2px;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font-size:13px;font-weight:800}.mini-stats strong{color:var(--ink);font-size:16px;line-height:1}.mini-stats small{color:var(--muted);font-size:11px;line-height:1}.study-card{position:relative;display:grid;gap:16px;align-content:start;grid-auto-rows:max-content;min-height:430px;padding:16px;touch-action:none;-webkit-user-select:none;user-select:none}.study-card.layout-longform{touch-action:pan-y;-webkit-user-select:text;user-select:text}.study-card.feedback-correct{border-color:#16a34a}.study-card.feedback-wrong{border-color:#ef4444}.study-card.feedback-undo{border-color:var(--accent)}.feedback-pill{position:absolute;top:12px;right:12px;z-index:2;display:inline-flex;min-height:32px;align-items:center;border-radius:999px;background:var(--ink);color:#fff;font-size:13px;font-weight:900;padding:5px 12px;pointer-events:none}.prompt-button{width:100%;min-height:154px;border:1px solid var(--line);border-radius:8px;background:#fffdf7;color:var(--ink);font-size:var(--prompt-font-size, 30px);font-weight:var(--prompt-font-weight, 900);line-height:var(--prompt-line-height, 1.12);letter-spacing:0;padding:22px;overflow-wrap:anywhere;touch-action:none}.prompt-button.prompt-size-short{--prompt-font-size: 30px;--prompt-font-weight: 900;--prompt-line-height: 1.12}.prompt-button.prompt-size-medium{--prompt-font-size: 24px;--prompt-font-weight: 850;--prompt-line-height: 1.25}.prompt-button.prompt-size-long{--prompt-font-size: 20px;--prompt-font-weight: 800;--prompt-line-height: 1.4}.prompt-button.prompt-size-longform{--prompt-font-size: 17px;--prompt-font-weight: 750;--prompt-line-height: 1.55}.prompt-button.prompt-choice.prompt-size-short{--prompt-font-size: 22px;--prompt-font-weight: 800;--prompt-line-height: 1.35}.prompt-button.prompt-choice.prompt-size-medium{--prompt-font-size: 19px;--prompt-font-weight: 800;--prompt-line-height: 1.45}.prompt-button.prompt-choice.prompt-size-long,.prompt-button.prompt-choice.prompt-size-longform{--prompt-font-size: 17px;--prompt-font-weight: 750;--prompt-line-height: 1.55}.prompt-button.longform{display:block;max-height:none;overflow:visible;text-align:left;white-space:pre-wrap;touch-action:pan-y}.hint-box,.answer-box{display:grid;min-height:92px;align-content:center;gap:8px;border:1px dashed var(--line);border-radius:8px;color:transparent;padding:16px;text-align:center}.hint-box{color:var(--ink);border-style:solid;background:#fff7ed}.hint-box strong{color:var(--accent);font-size:13px}.hint-box span{font-size:18px;font-weight:800;white-space:pre-wrap}.answer-box.visible{color:var(--ink);border-style:solid;background:var(--surface-2)}.answer-box span{font-size:24px;font-weight:900;white-space:pre-wrap}.answer-box small{color:var(--muted);font-size:14px;font-weight:750;line-height:1.5}.choices{display:grid;gap:10px}.choices button{min-height:54px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-weight:800;padding:10px 12px;overflow-wrap:anywhere}.choices button.selected{border-color:var(--primary);background:#e6fffb;color:var(--primary-dark);box-shadow:inset 0 0 0 2px var(--primary)}.choices button.correct{border-color:#16a34a;background:#ecfdf3;color:#166534}.choices button.wrong{border-color:#ef4444;background:#fff1f0;color:var(--danger)}.matching-board{display:grid;gap:8px}.matching-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;align-items:stretch}.matching-row button{display:grid;min-height:58px;align-items:center;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-size:14px;font-weight:850;line-height:1.32;padding:9px;text-align:center;overflow-wrap:anywhere}.matching-row button.selected{border-color:var(--primary);background:var(--surface-2);color:var(--primary-dark)}.matching-row 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