.account-shell{max-width:1100px;margin:28px auto 48px;min-width:0}
.account-shell--split{display:grid;grid-template-columns:1.08fr 1fr;border:1px solid var(--line);border-radius:24px;overflow:hidden;background:var(--surface);box-shadow:0 18px 60px rgba(24,60,66,.045)}
.account-shell--compact{max-width:560px}
.account-panel{min-width:0;padding:48px;background:var(--surface)}
.account-shell--compact .account-panel{border:1px solid var(--line);border-radius:20px;padding:40px}
.account-panel h1,.account-panel h2{font-size:2rem;line-height:1.15;letter-spacing:-.045em;margin:0 0 12px;color:var(--ink)}
.account-description{color:var(--muted);line-height:1.6;margin:0 0 28px;max-width:42ch}
.account-intro{background:#e4efef;padding:48px 44px 28px;display:flex;flex-direction:column;position:relative;overflow:hidden}
.account-intro-copy h1{font-size:clamp(2rem,3.5vw,3rem);letter-spacing:-.055em;line-height:1.12;max-width:12ch;margin:0 0 20px;color:#1c4d51}
.account-intro-copy p{font-size:1rem;line-height:1.65;color:#466a6d;max-width:30ch;margin:0}
.account-intro-note{color:#466a6d;font-size:.82rem;margin:auto 0 0;padding-top:24px}
.conversation-art{position:relative;max-width:320px;width:100%;height:240px;margin:28px auto 12px}
.art-scene{position:absolute;right:0;top:0;width:220px;color:#669993;background:rgba(255,255,255,.62);border-radius:16px;padding:9px}
.art-scene svg{width:100%;display:block}
.art-message{display:flex;align-items:flex-start;gap:12px;position:absolute;padding:19px;border-radius:16px;background:white;box-shadow:0 10px 28px rgba(31,79,80,.08)}
.art-message--tutor{left:0;top:88px;width:250px;border-bottom-left-radius:4px}
.art-avatar{width:30px;height:30px;display:grid;place-items:center;color:var(--accent);background:var(--soft);border-radius:9px;flex-shrink:0}
.art-avatar svg{width:23px;height:23px}
.art-lines{display:flex;flex-direction:column;gap:9px;flex:1;padding:4px 0}
.art-lines i{display:block;height:5px;background:#d6e5e4;border-radius:3px}
.art-lines i:last-child{width:66%}
.art-message--you{right:0;top:180px;width:190px;background:var(--accent);border-bottom-right-radius:4px}
.art-message--you .art-lines i{background:rgba(255,255,255,.45)}
.account-form{margin:0}
.account-field{margin-bottom:20px}
.account-field label{font-size:.88rem;margin-bottom:8px;font-weight:650}
.account-field input:not([type=checkbox]):not([type=radio]),.account-field select{min-height:48px;border-radius:9px}
.account-field .helptext{font-size:.78rem;line-height:1.5;margin-top:8px}
.account-field .helptext ul{padding-left:18px;margin:5px 0}
.account-field--invalid input{border-color:#af4741!important}
.account-field .errorlist{font-size:.82rem;padding:9px 11px;margin:8px 0 0}
.account-form-errors{font-size:.9rem}
.password-control{position:relative}
.password-control input{padding-right:70px!important}
.password-control .password-toggle{position:absolute;right:7px;top:7px;bottom:7px;min-height:0;padding:4px 8px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-size:.78rem;font-weight:600}
.password-control .password-toggle:hover{background:var(--canvas);color:var(--ink);filter:none}
.account-form-link{text-align:right;font-size:.84rem;margin:-5px 0 24px}
.account-submit{width:100%;min-height:48px}
.account-switch{border-top:1px solid var(--line);padding-top:22px;margin-top:28px;text-align:center;font-size:.86rem}
.account-switch>span{display:inline-block;margin-right:5px;color:var(--muted)}
.account-switch>a{font-weight:650}
.account-switch p{color:var(--muted);font-size:.78rem;margin:6px 0 0}
.account-back{display:inline-block;font-size:.85rem;margin-bottom:26px;text-decoration:none}
.account-back:before{content:'‹';display:inline-block;margin-right:8px;font-size:1.25em;line-height:1}
.account-help{padding:18px 20px;margin:24px 0;border-radius:12px;background:var(--canvas);font-size:.86rem;line-height:1.6}
.account-help p{margin:5px 0 0;color:var(--muted)}
.account-symbol{height:52px;width:52px;background:var(--soft);color:var(--accent);border-radius:16px;display:grid;place-items:center;margin:0 0 24px}
.account-symbol svg{width:28px;height:28px}
.account-email{padding:16px 20px;background:var(--canvas);border:1px solid var(--line);border-radius:10px;font-weight:650;overflow-wrap:anywhere;margin:0 0 24px}
.account-shell--signup{display:grid;grid-template-columns:.8fr 1fr;gap:60px;max-width:1020px;align-items:start}
.account-shell--signup .account-panel{border:1px solid var(--line);border-radius:20px;padding:36px}
.signup-guide{padding:10px 0}
.signup-guide h2{font-size:2.2rem;line-height:1.15;letter-spacing:-.05em;max-width:13ch;margin:0 0 18px}
.signup-guide>p{color:var(--muted);max-width:32ch;line-height:1.7}
.account-steps{list-style:none;padding:0;margin:40px 0}
.account-steps li{display:flex;gap:16px;margin-bottom:28px;align-items:flex-start}
.account-steps li>span{display:grid;place-items:center;width:30px;height:30px;flex-shrink:0;background:#e0eeee;color:var(--accent-dark);border-radius:50%;font-size:.8rem;font-weight:650}
.account-steps strong{display:block;font-size:.9rem;margin:2px 0 7px}
.account-steps p{font-size:.85rem;color:var(--muted);line-height:1.6;margin:0;max-width:31ch}
.recruitment-note{font-size:.84rem;line-height:1.6;color:var(--muted);padding:15px 18px;background:var(--soft);border-radius:10px;margin:22px 0}
.participant-home{max-width:1080px;margin:18px auto}
.home-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:36px}
.home-heading h1{margin:0 0 10px;font-size:2.3rem;letter-spacing:-.045em}
.home-heading p{color:var(--muted);margin:0}
.home-study-list{display:grid;gap:20px}
.home-study{display:flex;justify-content:space-between;gap:36px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:32px}
.home-study-main{max-width:650px;min-width:0;flex:1}
.home-study-labels{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.home-study h2{font-size:1.45rem;letter-spacing:-.025em;margin:0 0 12px}
.home-study p{color:var(--muted);font-size:.9rem;max-width:55ch;line-height:1.65}
.study-state{display:inline-flex;align-items:center;gap:7px;font-size:.78rem;font-weight:600;color:var(--muted)}
.study-state:before{content:'';width:6px;height:6px;border-radius:50%;background:currentColor}
.study-state--active,.study-state--completed{color:var(--accent)}
.study-state--suspended{color:#936320}
.home-study-progress{margin-top:24px;max-width:350px}
.home-study-progress label{font-size:.75rem;font-weight:500;color:var(--muted);margin:0 0 8px}
.home-study-progress progress{width:100%;height:6px;border:0;display:block;appearance:none;border-radius:9px;background:#e6eded;overflow:hidden}
.home-study-progress progress::-webkit-progress-bar{background:#e6eded;border-radius:9px}
.home-study-progress progress::-webkit-progress-value{background:var(--accent);border-radius:9px}
.home-study-progress progress::-moz-progress-bar{background:var(--accent);border-radius:9px}
.home-study-action{display:flex;align-items:flex-end;justify-content:center;flex-direction:column;gap:24px;flex-shrink:0}
.home-study-action .button{min-width:166px}
.followup-date{text-align:right;display:flex;flex-direction:column;gap:3px}
.followup-date span{color:var(--muted);font-size:.77rem}
.followup-date strong{font-size:1.08rem;letter-spacing:-.02em}
.home-other-study{font-size:.86rem;text-align:center;color:var(--muted);margin:28px 0}
.home-supplements{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:24px 28px;background:var(--soft);border-radius:14px;margin-bottom:24px}
.home-supplements h2{font-size:1.05rem;margin:0 0 8px}
.home-supplements p{color:var(--muted);font-size:.86rem;margin:0;max-width:60ch}
.home-supplement-links{display:flex;flex-direction:column;gap:8px;flex-shrink:0}
.home-empty{display:flex;flex-direction:column;align-items:center;text-align:center;border:1px dashed #bdd1d3;background:rgba(255,255,255,.65);border-radius:20px;padding:56px 28px}
.home-empty h2{font-size:1.4rem;max-width:27ch;margin:0 0 14px}
.home-empty p{max-width:43ch;color:var(--muted);font-size:.92rem;margin:0 0 28px}
.study-status{max-width:660px;margin:18px auto 48px}
.status-panel{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:40px}
.status-panel h1{font-size:2.1rem;letter-spacing:-.045em;line-height:1.15;margin:0 0 20px}
.status-panel>p{color:var(--muted);line-height:1.7}
.status-study-name{font-size:.82rem;margin:0 0 28px}
.status-panel>.badge{margin:-12px 0 26px}
.status-followup{background:var(--soft);border-radius:14px;padding:24px;margin:28px 0 18px}
.status-followup>span,.completion-code>span{display:block;font-size:.82rem;color:var(--muted);margin-bottom:8px}
.status-followup strong{font-size:1.35rem;letter-spacing:-.02em;line-height:1.4}
.status-followup p{margin:10px 0 0;font-size:.86rem;color:var(--muted);line-height:1.6}
.completion-code{padding:20px 0;margin:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.completion-code strong{font-size:1.3rem;letter-spacing:.035em;overflow-wrap:anywhere}
.withdraw-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
@media(max-width:950px){.account-panel{padding:36px}.account-intro{padding:36px 30px 28px}.account-shell--signup{gap:32px}.home-study{gap:24px;padding:26px}}
@media(max-width:720px){.account-shell{margin:8px auto 28px}.account-shell--split{grid-template-columns:1fr;max-width:480px;border-radius:18px}.account-intro{padding:28px 28px 24px}.account-intro-copy h1{font-size:1.85rem;max-width:18ch;margin-bottom:12px}.account-intro-copy p{font-size:.9rem;max-width:34ch}.conversation-art,.account-intro-note{display:none}.account-panel,.account-shell--compact .account-panel{padding:28px}.account-panel h1,.account-panel h2{font-size:1.75rem}.account-shell--signup{display:block;max-width:540px}.signup-guide{padding:0 4px 20px}.signup-guide h2{font-size:1.65rem;max-width:none;margin:0 0 12px}.signup-guide>p{max-width:45ch;font-size:.9rem}.signup-guide .account-back{margin-bottom:18px}.account-steps{display:none}.account-shell--signup .account-panel{padding:28px}.home-heading{align-items:flex-start;flex-direction:column;gap:18px;margin-bottom:26px}.home-heading h1{font-size:2rem}.home-study{flex-direction:column;padding:24px;gap:26px}.home-study-action{flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px}.followup-date{text-align:left}.home-study-action .button{flex:1;min-width:0}.home-study-progress{max-width:none}.home-supplements{flex-direction:column;align-items:stretch;padding:24px;gap:20px}.status-panel{padding:28px}.status-panel h1{font-size:1.8rem}.home-empty{padding:40px 24px}.home-empty h2{font-size:1.25rem}.participant-home{margin:8px auto}.withdraw-actions{flex-direction:column;align-items:stretch}.status-followup{padding:20px}.status-followup strong{font-size:1.15rem}}
@media(prefers-reduced-motion:reduce){.account-shell *{scroll-behavior:auto}}