/* AI-assisted implementation with OpenAI Codex, 2026-10-18. */
/* AI-assisted code
   Purpose: Keep explanatory sound text readable when audio is unavailable.
   Prepared for review by: Dimitriy Leontev
   Generated: 2026-10-19 */
:root{color-scheme:light;--paper:#f8f7f3;--ink:#282d27;--muted:#666b60;--line:#e6e7df;--accent:#b6472b;--accent-hover:#933820;--soft:#f9eee8;--ring:#eeeae2;--green:#3d624d;font-family:Inter,"Segoe UI",Arial,sans-serif;font-synthesis:none}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased}
body[data-mode="short"]{--accent:#33634e;--accent-hover:#254c3b;--soft:#edf3ed;--ring:#e5ece3}
body[data-mode="long"]{--accent:#4e5e94;--accent-hover:#3a4776;--soft:#eef0f8;--ring:#e8eaf2}
button,input,a{-webkit-tap-highlight-color:transparent}
button,input,select{font:inherit}
button{cursor:pointer}
button:disabled{cursor:default}
button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible,[tabindex="-1"]:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
button{touch-action:manipulation}
a{color:inherit}
svg{display:block}
[hidden]{display:none!important}
.wrapper{width:min(1100px,calc(100% - 80px));margin-inline:auto}
.site-header{height:104px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:25px;font-weight:750;letter-spacing:-1px}
.brand-mark{width:36px;height:36px;color:var(--accent)}
.brand-dot{color:var(--accent)}
.header-note{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}
.tiny-spark{color:var(--accent);font-size:21px}
.intro{padding:49px 0 35px}
.eyebrow{font-size:10px;font-weight:750;letter-spacing:1.8px;color:var(--muted);margin:0 0 14px}
.intro h1{font-size:clamp(34px,4vw,48px);font-weight:650;letter-spacing:-2px;line-height:1.15;margin:0 0 16px}
.intro h1 span{font-family:Georgia,"Times New Roman",serif;font-weight:400;font-style:italic;color:var(--accent)}
.intro>p:last-child{font-size:14px;line-height:1.8;color:var(--muted);margin:0}
.mobile-break{display:none}
.workspace{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:52px;align-items:start}
.timer-card{min-width:0;padding:25px 32px 0;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:0 6px 26px #282d2704}
.mode-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;background:#f4f4ef;padding:5px;border-radius:12px}
.mode-button{border:0;border-radius:9px;background:transparent;padding:10px 5px;font-size:12px;font-weight:650;color:#5d6258;min-height:51px}
.mode-button span{display:block;font-size:10px;font-weight:400;margin-top:4px}
.mode-button[aria-pressed="true"]{background:#fff;color:var(--accent);box-shadow:0 1px 4px #282d2710}
.mode-button:hover{color:var(--accent)}
.timer-stage{text-align:center;padding-top:26px}
.timer-ring{position:relative;width:min(300px,100%);aspect-ratio:1;margin:auto}
.timer-ring>svg{width:100%;height:100%;transform:rotate(-90deg);overflow:visible}
.timer-ring circle{fill:none;stroke-width:5}
.ring-track{stroke:var(--ring)}
.ring-value{stroke:var(--accent);stroke-linecap:round}
.timer-face{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;padding-top:7px}
.session-label{font-size:9px;letter-spacing:2px;font-weight:700;color:var(--muted);margin-bottom:10px}
.time{font-size:70px;font-weight:500;letter-spacing:-3px;line-height:1.15;font-variant-numeric:tabular-nums}
.timer-status{display:flex;align-items:center;gap:6px;font-size:10px;color:var(--muted);margin-top:14px}
.timer-status>span:first-child{width:5px;height:5px;border-radius:50%;background:var(--accent)}
.timer-caption{font-size:12px;line-height:1.6;color:var(--muted);margin:17px 0 23px;min-height:20px}
.timer-controls{display:flex;align-items:center;gap:10px;margin-bottom:29px}
.button{display:flex;justify-content:center;align-items:center;gap:7px;min-height:46px;border:1px solid transparent;border-radius:9px;font-size:12px;font-weight:650;padding:12px 15px}
.button svg{width:17px;height:17px;flex-shrink:0}
.button-primary{background:var(--accent);color:#fff;flex:1.5}
.button-primary:hover:enabled{background:var(--accent-hover)}
.button-primary:disabled{opacity:.55}
.button-secondary{background:#fff;color:var(--ink);border-color:#d6d9cf;flex:1}
.button-secondary:hover:enabled,.button-reset:hover:enabled{background:#f3f4ef}
.button-secondary:disabled,.button-reset:disabled{color:#6c7167;background:#f4f4f0;border-color:#e5e7de}
.button-reset{padding-inline:10px;background:#fff;color:var(--muted)}
.completion{border-radius:10px;background:var(--soft);padding:14px 16px;margin-bottom:20px;font-size:12px;line-height:1.6}
.completion p{margin:0 0 5px}
.text-button{border:0;background:transparent;padding:3px 0;color:var(--accent);font-weight:650;font-size:12px;min-height:28px}
.text-button span{margin-left:6px}
.notification-setting{display:flex;align-items:center;gap:12px;padding:19px 0 21px;border-top:1px solid var(--line)}
.bell{width:20px;height:20px;color:var(--muted);flex-shrink:0}
.notification-setting>div{flex:1}
.notification-setting label{display:inline-block;cursor:pointer;font-size:12px;font-weight:600}
.notification-setting p{font-size:10px;color:var(--muted);margin:5px 0 0;line-height:1.5;max-width:290px}
.switch{appearance:none;position:relative;flex-shrink:0;width:36px;height:22px;margin:0;border-radius:20px;background:#767d70;border:1px solid #767d70;cursor:pointer;transition:background .15s}
.switch::before{content:"";display:block;width:14px;height:14px;border-radius:50%;background:#fff;position:absolute;left:3px;top:3px;transition:transform .15s}
.switch:checked{background:var(--accent);border-color:var(--accent)}
.switch:checked::before{transform:translateX(14px)}
.switch:disabled{opacity:.5;cursor:default}
.rhythm-panel{padding-top:12px}
.aside-heading{display:flex;align-items:center;justify-content:space-between}
.aside-heading .eyebrow{margin:0}
.aside-heading svg{width:20px;height:20px;color:#777e6a}
.rhythm-panel h2{font-family:Georgia,"Times New Roman",serif;font-size:32px;line-height:1.2;font-weight:400;letter-spacing:-.7px;margin:20px 0 29px}
.rhythm-steps{list-style:none;padding:0;margin:0;display:grid;gap:27px}
.rhythm-steps li{display:flex;gap:15px}
.step-number{font-size:10px;font-weight:600;background:#eeefe8;color:#656e5a;width:29px;height:29px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.rhythm-steps li>div{flex:1;padding-top:1px}
.rhythm-steps h3{display:flex;align-items:center;justify-content:space-between;gap:6px;font-size:12px;font-weight:650;margin:0 0 7px;line-height:1.5}
.rhythm-steps h3 span{font-size:9px;white-space:nowrap;color:var(--muted);font-weight:400}
.rhythm-steps p{font-size:11px;color:var(--muted);line-height:1.65;margin:0}
.session-summary{background:#eeefe7;border:1px solid #e5e7db;border-radius:14px;padding:21px 23px;margin-top:32px}
.summary-heading{display:flex;align-items:center;justify-content:space-between;gap:6px}
.summary-heading h3{font-size:12px;font-weight:600;margin:0}
.summary-heading>span{font-size:8px;letter-spacing:1px;color:var(--muted)}
.session-dots{display:flex;gap:9px;margin:21px 0 15px}
.session-dots span{height:12px;width:12px;border:1px solid #c6cbbd;border-radius:50%;background:#fafaf5}
.session-dots span.done{background:var(--green);border-color:var(--green)}
.session-summary>p{font-size:11px;margin:0;color:#454e3c}
.session-summary .summary-note{font-size:10px;color:var(--muted);padding-top:13px;margin-top:13px;border-top:1px solid #d9ddce}
.manual-note{font-size:10px;color:var(--muted);display:flex;gap:8px;line-height:1.6;margin:17px 0 0}
.manual-note span{font-size:14px;color:var(--green)}
.sound-panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:21px 23px;margin-top:20px;min-width:0}
.sound-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}
.sound-heading h3{margin:0;font-size:14px;font-weight:650}
.sound-badge{font-size:8px;letter-spacing:1px;color:var(--muted)}
.sound-intro{font-size:11px;line-height:1.6;color:var(--muted);margin:8px 0 17px}
.sound-selectors{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px}
.sound-selectors label,.sound-volume-heading label{display:block;font-size:11px;font-weight:600;margin-bottom:7px}
.sound-selectors select{width:100%;min-height:42px;border:1px solid #c9cec0;border-radius:8px;background:#fafaf7;color:var(--ink);padding:8px;font-size:12px;cursor:pointer}
.sound-volume-heading{display:flex;align-items:center;justify-content:space-between;margin-top:18px}
.sound-volume-heading label{margin:0}
.sound-volume-heading output{font-size:10px;color:var(--muted);font-variant-numeric:tabular-nums}
.sound-volume-controls{display:flex;align-items:center;gap:12px;margin-top:3px}
.sound-volume-controls input{min-width:0;flex:1;min-height:36px;margin:0;accent-color:var(--accent);cursor:pointer}
.sound-mute{min-height:36px;min-width:64px;border:1px solid #c9cec0;border-radius:7px;background:#fafaf7;color:var(--ink);font-size:11px;cursor:pointer}
.sound-mute[aria-pressed="true"]{background:var(--soft);color:var(--accent);border-color:var(--accent)}
.sound-mute:hover:enabled{background:var(--soft)}
.sound-status{font-size:10px;line-height:1.7;min-height:34px;margin:9px 0 0;color:var(--muted)}
.site-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:44px;padding:23px 0 27px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}
.site-footer>span:last-child{display:flex;align-items:center;gap:8px}
.site-footer>span:last-child>span{font-size:17px;color:var(--accent)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.skip-link{position:fixed;left:16px;top:12px;padding:12px;background:#fff;z-index:10;transform:translateY(-160%);border-radius:6px;font-size:14px}
.skip-link:focus{transform:translateY(0)}
.noscript{color:var(--accent);font-size:14px;padding-bottom:20px}
@media(min-width:1300px){.wrapper{width:min(1100px,calc(100% - 120px))}.workspace{gap:64px;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}.timer-card{padding-inline:40px}}
@media(max-width:900px){.wrapper{width:calc(100% - 48px)}.workspace{gap:28px;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr)}.timer-card{padding-inline:20px}.rhythm-panel h2{font-size:28px}.rhythm-steps h3{display:block}.rhythm-steps h3 span{display:block;margin-top:2px}.rhythm-steps{gap:19px}.session-summary{padding:18px}.button{padding-inline:10px}}
@media(max-width:690px){.wrapper{width:min(480px,calc(100% - 36px))}.site-header{height:80px}.brand{font-size:23px}.header-note{font-size:0;gap:0}.tiny-spark{font-size:24px}.intro{padding:34px 0 27px}.intro h1{font-size:36px;letter-spacing:-1.5px}.intro>p:last-child{font-size:12px}.mobile-break{display:block}.workspace{grid-template-columns:1fr;gap:35px}.timer-card{padding:18px 20px 0}.timer-ring{width:min(280px,100%)}.timer-stage{padding-top:24px}.time{font-size:66px}.timer-controls{gap:8px}.button{font-size:12px}.rhythm-panel{padding:0 4px}.rhythm-panel h2{font-size:29px;margin-bottom:25px}.rhythm-panel h2 br{display:none}.rhythm-steps{gap:23px}.rhythm-steps h3{display:flex}.rhythm-steps h3 span{margin:0}.rhythm-steps p{font-size:12px}.session-summary{margin-top:27px}.site-footer{margin-top:30px;align-items:flex-start;flex-direction:column;gap:12px}.notification-setting p{font-size:10px}}
@media(max-width:380px){.timer-controls{display:grid;grid-template-columns:1fr 1fr}.button-reset{grid-column:1/-1}.time{font-size:58px}}
@media(prefers-reduced-motion:reduce){*,*::before{transition:none!important;scroll-behavior:auto!important}}