:root{--accent:#007aff;--grad1:#4facfe;--grad2:#00f2fe;--bg:#f2f2f7;--card:#fff;--panel:#f2f2f7;--tertiary:#f2f2f7;--text:#16181c;--muted:#7b8090;--line:rgba(90,90,90,.12);--shadow:0 4px 15px rgba(20,30,60,.05);color-scheme:light}
:root.dark{--bg:#0c0d12;--card:#1b1b21;--panel:#25252b;--tertiary:#2c2c32;--text:#f5f5f7;--muted:#a0a0ad;--line:rgba(200,200,200,.14);--shadow:0 4px 15px rgba(0,0,0,.2);color-scheme:dark}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:-apple-system-body;font-family:-apple-system,BlinkMacSystemFont,'Helvetica Neue',sans-serif;line-height:1.45}button,input,select,textarea{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}button:disabled{opacity:.38;cursor:default}.topbar{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top)}.top-inner{display:flex;align-items:center;gap:6px;height:56px;max-width:780px;margin:auto;padding:0 15px}.top-inner h1{font-size:19px;font-weight:750;white-space:nowrap;margin:0 auto 0 8px;letter-spacing:-.35px}.actions{display:flex;align-items:center;gap:6px}.icon-button{border:0;background:transparent;color:var(--accent);min-width:34px;height:42px;padding:0;display:grid;place-items:center;font-size:28px;line-height:1;font-weight:500}.icon-button.neutral{color:var(--muted);font-size:25px}.content{max-width:780px;margin:0 auto;padding:18px 16px calc(40px + env(safe-area-inset-bottom))}.banner{padding:12px 14px;background:rgba(255,149,0,.14);border:1px solid rgba(255,149,0,.28);border-radius:12px;margin-bottom:16px;font-size:13px}.banner.danger{background:rgba(255,59,48,.12);border-color:rgba(255,59,48,.3)}.hidden{display:none!important}.hero{background:linear-gradient(125deg,var(--grad1),var(--grad2));color:white;border-radius:24px;padding:20px;box-shadow:0 9px 20px color-mix(in srgb,var(--accent) 25%,transparent);margin-bottom:16px}.hero .label-row{display:flex;align-items:center;justify-content:space-between;gap:15px;font-weight:650;font-size:16px}.hero .date{font-size:12px;opacity:.85;font-weight:500}.hero-time{font-size:clamp(39px,11vw,58px);font-variant-numeric:tabular-nums;font-weight:850;letter-spacing:-2px;line-height:1.45}.goal-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:14px}.panel{background:var(--card);border-radius:20px;box-shadow:var(--shadow);padding:16px}.panel-title{font-size:13px;font-weight:700;color:var(--muted);display:flex;gap:7px;align-items:center;margin-bottom:6px}.panel-title .symbol{color:var(--accent);font-size:16px}.panel-val{font-size:24px;letter-spacing:-.8px;white-space:nowrap;font-weight:750;font-variant-numeric:tabular-nums}.goal-line{height:6px;background:var(--panel);border-radius:99px;margin:10px 0 5px;overflow:hidden}.goal-fill{height:100%;background:var(--accent);border-radius:99px}.goal-detail{font-size:11px;color:var(--muted)}.total-panel{display:flex;align-items:center;justify-content:space-between;gap:8px;border-radius:16px}.total-panel span{font-weight:700;color:var(--muted);font-size:14px}.total-panel strong{color:var(--accent);font-size:21px;white-space:nowrap}.section-head{display:flex;align-items:center;justify-content:space-between;margin:26px 0 14px}.section-head h2{font-size:21px;letter-spacing:-.4px;margin:0;font-weight:750}.pill{border:none;border-radius:99px;padding:9px 14px;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);font-weight:700;font-size:13px}.subject-card{background:var(--card);border-radius:24px;padding:16px;box-shadow:var(--shadow);margin-bottom:16px}.subject-head{display:flex;align-items:center;gap:10px;padding:0 0 13px;border-bottom:1px solid var(--line)}.subject-head .dot{height:14px;width:14px;border-radius:50%;flex-shrink:0}.subject-name{font-size:20px;font-weight:750;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.subject-total{margin-left:auto;color:var(--muted);font-weight:650;font-variant-numeric:tabular-nums;white-space:nowrap;font-size:14px}.materials{display:grid;gap:10px;padding:14px 0}.material{display:flex;gap:7px;align-items:center;border-radius:13px;background:var(--tertiary);padding:8px 10px;min-height:58px}.material.is-running{background:color-mix(in srgb,var(--subject-color) 9%,var(--card))}.material-name{font-size:15px;font-weight:600;flex:1;min-width:0;overflow-wrap:anywhere}.material-time{color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums;white-space:nowrap}.timer-button{border:none;background:none;color:var(--subject-color);font-size:33px;line-height:1;width:36px;height:40px;display:grid;place-items:center;padding:0}.timer-button.pause{color:#ff9500}.reset-button{border:0;background:none;color:#a9a9b2;font-size:23px;padding:0 2px;line-height:1}.add-material{width:100%;border:0;border-radius:10px;padding:10px;font-size:13px;font-weight:700;color:var(--subject-color);background:color-mix(in srgb,var(--subject-color) 10%,transparent)}.empty{background:var(--card);border-radius:22px;padding:34px 20px;text-align:center;color:var(--muted);font-size:14px}.empty .books{font-size:42px;margin-bottom:15px}.muted{color:var(--muted)}footer{text-align:center;color:var(--muted);font-size:11px;margin-top:24px;line-height:1.9}.toast{position:fixed;z-index:30;bottom:calc(25px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);max-width:90%;border-radius:13px;background:#333;color:white;padding:12px 18px;box-shadow:0 10px 30px rgba(0,0,0,.18);font-size:13px;white-space:pre-line;text-align:center}
.dialog-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:20;display:flex;align-items:flex-end;justify-content:center}.dialog{background:var(--bg);width:100%;max-width:780px;max-height:calc(100dvh - env(safe-area-inset-top) - 22px);border-radius:19px 19px 0 0;display:flex;flex-direction:column;padding-bottom:env(safe-area-inset-bottom)}.dialog-header{display:flex;align-items:center;justify-content:space-between;padding:13px 18px 12px;background:var(--card);border-bottom:1px solid var(--line);min-height:54px}.dialog-header h2{font-size:17px;font-weight:750;margin:0;text-align:center}.dialog-header button{background:none;border:0;color:var(--accent);min-width:62px;font-size:15px}.dialog-done{font-weight:700!important;text-align:right}.dialog-cancel{text-align:left}.dialog-body{padding:18px 16px 28px;overflow-y:auto;overscroll-behavior:contain}.form-section{margin-bottom:22px}.form-section h3{font-size:13px;text-transform:none;margin:0 0 10px 5px;color:var(--muted);font-weight:650}.form-card{background:var(--card);border-radius:14px;overflow:hidden}.field-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 15px;border-bottom:1px solid var(--line);min-height:46px}.field-row:last-child{border:0}.field-row label{flex:1;min-width:0;font-size:14px}.field-row input,.field-row select{max-width:62%;text-align:right;border:0;background:transparent;color:var(--text);padding:5px 0;font-size:15px;min-width:0}.field-row textarea{width:100%;min-height:75px;margin-top:7px;background:var(--panel);color:var(--text);border:none;border-radius:10px;padding:10px}.field-col{display:flex;flex-direction:column;gap:7px;padding:12px 15px;border-bottom:1px solid var(--line)}.field-col:last-child{border-bottom:0}.field-col input,.field-col select{width:100%;background:var(--panel);border:0;padding:11px;border-radius:9px;color:var(--text)}.field-col label{font-size:14px;font-weight:650}.color-choice{display:flex;flex-wrap:wrap;gap:10px;padding:14px}.swatch{width:33px;height:33px;border-radius:50%;border:3px solid transparent;box-shadow:inset 0 0 0 2px var(--card)}.swatch.selected{outline:2px solid var(--text);outline-offset:2px}.form-action{display:block;text-align:left;background:transparent;border:0;color:var(--accent);font-size:15px;padding:14px 15px;width:100%;border-bottom:1px solid var(--line)}.form-action:last-child{border:0}.form-action.danger{color:#ff3b30}.small-help{font-size:12px;color:var(--muted);line-height:1.6;margin:8px 6px 0}.warning{color:#c68008}.subject-editor{padding:12px 15px;border-bottom:1px solid var(--line)}.subject-editor:last-child{border:0}.subject-editor summary{font-weight:700;cursor:pointer}.subject-editor .mini-field{display:flex;align-items:center;gap:10px;margin-top:12px;font-size:13px}.subject-editor .mini-field input{min-width:0;width:100%;background:var(--panel);color:var(--text);border:none;border-radius:8px;padding:9px}.mini-delete{font-size:13px;background:none;border:none;color:#ff3b30;white-space:nowrap;padding:6px}.badge-gray{display:inline-block;border-radius:8px;background:var(--panel);color:var(--muted);padding:4px 7px;font-size:11px}.calendar-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.calendar-head button{border:0;background:none;color:var(--accent);font-size:25px;padding:0 15px}.calendar-head strong{font-size:18px}.calendar{display:grid;grid-template-columns:repeat(7,1fr);gap:4px}.weekday{text-align:center;color:var(--muted);font-size:11px;padding:9px 0}.cal-day{border:0;border-radius:11px;min-height:43px;background:transparent;color:var(--text);position:relative;font-size:13px}.cal-day.has-record:after{content:"";position:absolute;width:4px;height:4px;background:var(--accent);bottom:3px;left:calc(50% - 2px);border-radius:50%}.cal-day.selected{background:var(--accent);color:#fff}.cal-day.selected:after{background:white}.calendar-detail{margin-top:14px}.range-group{display:flex;background:var(--card);border-radius:10px;padding:3px;gap:3px}.range-group button{flex:1;border:0;border-radius:8px;background:none;padding:10px 3px;color:var(--muted);font-size:12px}.range-group button.active{background:var(--accent);color:white;font-weight:700}.record-item{padding:12px 0;border-bottom:1px solid var(--line);display:flex;gap:8px;align-items:center}.record-item:last-child{border:0}.record-text{flex:1;min-width:0;font-size:13px}.record-text strong{display:block}.record-text small{display:block;color:var(--muted);font-size:11px}.record-duration{font-variant-numeric:tabular-nums;font-size:13px;font-weight:750}.graph-row{display:flex;gap:10px;align-items:center;margin:10px 0;font-size:12px}.graph-label{width:78px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.graph-track{background:var(--panel);height:10px;border-radius:20px;flex:1;overflow:hidden}.graph-bar{height:100%;border-radius:20px}.graph-time{color:var(--muted);width:64px;text-align:right;white-space:nowrap}.settings-note{font-size:12px;line-height:1.6;background:var(--panel);padding:12px;border-radius:10px}.inline-actions{display:flex;gap:8px;margin-top:10px}.inline-actions button{flex:1;border:0;border-radius:10px;padding:10px;background:var(--panel);color:var(--text);font-size:13px}.sync-status{font-size:12px;color:var(--muted);white-space:pre-line;margin-top:10px}
@media(min-width:740px){.dialog-backdrop{align-items:center;padding:22px}.dialog{border-radius:20px;max-height:90dvh;padding-bottom:0}.content{padding-top:25px}}
@media(max-width:360px){.top-inner{padding:0 9px}.top-inner h1{font-size:17px;margin-left:3px}.actions{gap:1px}.icon-button{min-width:31px}.panel{padding:13px}.panel-val{font-size:20px}.subject-name{font-size:18px}.material{padding:8px 7px}.material-name{font-size:13px}.material-time{font-size:11px}}

/* Offline cache readiness is distinct from online/offline connectivity. */
.pwa-state{margin:0 0 12px;padding:8px 12px;border-radius:9px;font-size:12px;font-weight:500;line-height:1.4}
.pwa-pending{background:rgba(255,149,0,.09);color:#946100}
.pwa-ready{background:rgba(52,199,89,.10);color:#167b35}
.pwa-error{background:rgba(255,59,48,.10);color:#bc2722}
.dark .pwa-pending{color:#ffca68}.dark .pwa-ready{color:#8ee6a4}.dark .pwa-error{color:#ff9691}