:root {
    --ink: #17333b;
    --muted: #657b82;
    --primary: #0a5b66;
    --primary-dark: #073f47;
    --accent: #26b8a5;
    --accent-soft: #dff6f1;
    --surface: #ffffff;
    --surface-alt: #f3f8f8;
    --line: #dbe7e8;
    --danger: #b73535;
    --danger-soft: #fff0f0;
    --warning: #a36b08;
    --warning-soft: #fff7df;
    --success: #187a65;
    --shadow: 0 18px 50px rgba(12, 64, 73, .10);
    --radius: 22px;
    --radius-small: 13px;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--surface-alt); }
body { margin: 0; color: var(--ink); background: linear-gradient(180deg, #f7fbfb 0%, #eef6f5 100%); min-height: 100vh; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }

.topbar {
    min-height: 78px;
    padding: 14px clamp(18px, 4vw, 56px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,.92);
    border-bottom: 1px solid rgba(219,231,232,.8);
    position: sticky;
    top: 0;
    z-index: 30;
    backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 46px; height: 46px; border-radius: 15px; background: linear-gradient(145deg, var(--primary), var(--accent)); color: white; display: grid; place-items: center; font-weight: 900; font-size: 25px; box-shadow: 0 10px 25px rgba(10,91,102,.22); }
.brand-logo { width: 56px; height: 56px; object-fit: contain; border-radius: 16px; background: white; padding: 6px; box-shadow: 0 10px 25px rgba(10,91,102,.10); }
.brand strong { display: block; font-size: 18px; letter-spacing: .08em; }
.brand small { display: block; color: var(--muted); margin-top: 1px; }
.topnav { display: flex; align-items: center; gap: 20px; }
.topnav a { text-decoration: none; font-weight: 700; color: var(--primary); }

.page-shell { width: min(1380px, calc(100% - 32px)); margin: 0 auto; padding: 44px 0 70px; min-height: calc(100vh - 150px); }
.footer { padding: 24px clamp(18px, 4vw, 56px); border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; color: var(--muted); font-size: 13px; background: rgba(255,255,255,.7); }

h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(34px, 5vw, 64px); line-height: 1.03; letter-spacing: -.035em; }
h2 { letter-spacing: -.02em; }
p { line-height: 1.65; }
.eyebrow { color: var(--success); text-transform: uppercase; letter-spacing: .12em; font-size: 12px; font-weight: 900; display: inline-block; margin-bottom: 12px; }
.muted { color: var(--muted); }

.btn { min-height: 46px; padding: 11px 18px; border-radius: 14px; border: 1px solid transparent; font-weight: 800; display: inline-flex; align-items: center; justify-content: center; gap: 8px; cursor: pointer; text-decoration: none; transition: transform .15s ease, box-shadow .15s ease, background .15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .55; cursor: progress; transform: none; }
.btn-primary { background: var(--primary); color: white; box-shadow: 0 10px 24px rgba(10,91,102,.18); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: white; color: var(--primary); border-color: var(--line); }
.btn-ghost { background: transparent; color: var(--primary); border-color: transparent; }
.btn-danger { background: var(--danger); color: white; }
.btn-small { min-height: 38px; padding: 8px 12px; font-size: 13px; border-radius: 11px; }
.icon-button { width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--line); background: white; color: var(--primary); display: grid; place-items: center; font-size: 25px; cursor: pointer; transition: transform .15s ease; }
.icon-button.is-open { transform: rotate(180deg); }
.icon-button.danger { color: var(--danger); }
.text-link { display: inline-block; margin-top: 18px; color: var(--primary); font-weight: 700; }
.back-link { display: inline-block; color: var(--primary); font-weight: 800; text-decoration: none; margin-bottom: 24px; }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(340px, .9fr); gap: clamp(32px, 6vw, 90px); align-items: center; padding: 24px 0 64px; }
.hero-copy p { max-width: 720px; font-size: 18px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 26px; }
.privacy-note { background: var(--accent-soft); border: 1px solid #bde9df; border-radius: 16px; padding: 15px 17px; color: #24584f; line-height: 1.5; }
.privacy-note.compact { font-size: 13px; }
.hero-card { min-height: 510px; border-radius: 36px; background: radial-gradient(circle at 50% 30%, #43ccb9 0%, #0a6973 45%, #073f47 100%); box-shadow: 0 35px 80px rgba(10,91,102,.25); position: relative; overflow: hidden; display: grid; place-items: center; }
.hero-card::before { content: ""; position: absolute; inset: 25px; border: 1px solid rgba(255,255,255,.23); border-radius: 28px; }
.metric-strip { position: absolute; left: 26px; right: 26px; bottom: 26px; display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; z-index: 2; }
.metric-strip div { background: rgba(255,255,255,.9); border-radius: 15px; padding: 13px; text-align: center; }
.metric-strip strong, .metric-strip span { display: block; }
.metric-strip strong { color: var(--primary); font-size: 21px; }
.metric-strip span { color: var(--muted); font-size: 12px; }
.skeleton-demo { width: 260px; height: 340px; position: relative; transform: translateY(-24px); }
.joint { position: absolute; width: 18px; height: 18px; border: 4px solid white; background: var(--accent); border-radius: 50%; z-index: 3; box-shadow: 0 0 0 5px rgba(255,255,255,.13); }
.bone { position: absolute; height: 6px; background: rgba(255,255,255,.9); transform-origin: left center; border-radius: 99px; z-index: 2; }
.head { left: 121px; top: 15px; width: 26px; height: 26px; }
.shoulder-l { left: 84px; top: 75px; } .shoulder-r { left: 166px; top: 75px; }
.elbow-l { left: 49px; top: 140px; } .elbow-r { left: 202px; top: 140px; }
.hand-l { left: 28px; top: 214px; } .hand-r { left: 223px; top: 214px; }
.hip-l { left: 100px; top: 190px; } .hip-r { left: 150px; top: 190px; }
.knee-l { left: 83px; top: 255px; } .knee-r { left: 177px; top: 255px; }
.ankle-l { left: 68px; top: 320px; } .ankle-r { left: 192px; top: 320px; }
.neck { width: 55px; left: 105px; top: 59px; transform: rotate(90deg); }
.shoulders { width: 82px; left: 93px; top: 84px; }
.torso-l { width: 116px; left: 93px; top: 84px; transform: rotate(82deg); }
.torso-r { width: 116px; left: 175px; top: 84px; transform: rotate(98deg); }
.hips { width: 50px; left: 109px; top: 199px; }
.arm-l-1 { width: 75px; left: 93px; top: 84px; transform: rotate(119deg); }
.arm-l-2 { width: 78px; left: 58px; top: 149px; transform: rotate(106deg); }
.arm-r-1 { width: 75px; left: 175px; top: 84px; transform: rotate(61deg); }
.arm-r-2 { width: 78px; left: 211px; top: 149px; transform: rotate(74deg); }
.leg-l-1 { width: 68px; left: 109px; top: 199px; transform: rotate(104deg); }
.leg-l-2 { width: 67px; left: 92px; top: 264px; transform: rotate(103deg); }
.leg-r-1 { width: 68px; left: 159px; top: 199px; transform: rotate(76deg); }
.leg-r-2 { width: 67px; left: 186px; top: 264px; transform: rotate(77deg); }

.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.feature-card { padding: 28px; background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 10px 28px rgba(12,64,73,.05); }
.feature-card > span { width: 38px; height: 38px; border-radius: 12px; background: var(--accent-soft); color: var(--primary); display: grid; place-items: center; font-weight: 900; margin-bottom: 20px; }
.feature-card p { color: var(--muted); margin-bottom: 0; }

.auth-page .page-shell { display: grid; place-items: center; }
.auth-card { width: min(100%, 520px); background: white; border: 1px solid var(--line); border-radius: 28px; padding: clamp(28px, 5vw, 48px); box-shadow: var(--shadow); }
.auth-card h1 { font-size: clamp(32px, 5vw, 46px); }
.setup-card { width: min(100%, 650px); }
.stack-form { display: grid; gap: 17px; }
label { display: grid; gap: 8px; font-weight: 800; color: var(--ink); }
input, select, textarea { width: 100%; border: 1px solid #cbdadb; background: white; border-radius: 13px; padding: 12px 14px; color: var(--ink); outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(38,184,165,.12); }
textarea { resize: vertical; }
.code-input { font-size: 25px; text-align: center; letter-spacing: .12em; text-transform: uppercase; font-weight: 900; }
.technical-note { margin-top: 22px; background: var(--surface-alt); padding: 15px; border-radius: 14px; color: var(--muted); font-size: 13px; line-height: 1.55; }

.alert { padding: 16px 18px; border-radius: 15px; margin-bottom: 20px; border: 1px solid transparent; line-height: 1.55; }
.alert-success { background: var(--accent-soft); border-color: #bde9df; color: #24584f; }
.alert-error { background: var(--danger-soft); border-color: #f1c7c7; color: #7f2929; }
.generated-code { margin-top: 12px; background: white; border-radius: 13px; padding: 12px; display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.generated-code strong { font-size: 24px; letter-spacing: .09em; }
.generated-code span { color: var(--muted); }

.dashboard-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 25px; margin-bottom: 28px; }
.dashboard-heading h1 { font-size: clamp(36px, 5vw, 58px); margin-bottom: 12px; }
.dashboard-heading p { color: var(--muted); margin-bottom: 0; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 25px 0 30px; }
.stats-grid article { background: white; border: 1px solid var(--line); border-radius: 19px; padding: 20px 22px; box-shadow: 0 8px 24px rgba(12,64,73,.04); }
.stats-grid strong, .stats-grid span { display: block; }
.stats-grid strong { font-size: 30px; color: var(--primary); }
.stats-grid span { color: var(--muted); margin-top: 4px; }
.patient-list { display: grid; gap: 15px; }
.patient-card { background: white; border: 1px solid var(--line); border-radius: 21px; overflow: hidden; box-shadow: 0 10px 30px rgba(12,64,73,.05); }
.patient-card.is-inactive { opacity: .72; }
.patient-summary { display: grid; grid-template-columns: auto minmax(220px, 1fr) auto auto; gap: 18px; align-items: center; padding: 20px; }
.avatar { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; background: linear-gradient(145deg, var(--primary), var(--accent)); color: white; font-size: 22px; font-weight: 900; }
.patient-title { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.patient-title h2 { margin-bottom: 0; }
.patient-main p { color: var(--muted); font-size: 13px; margin: 6px 0 0; }
.status { border-radius: 99px; padding: 5px 9px; font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: .07em; }
.status-active { background: var(--accent-soft); color: var(--success); }
.status-off { background: #eceff0; color: #647075; }
.patient-numbers { display: grid; grid-template-columns: repeat(3, auto); gap: 22px; text-align: center; }
.patient-numbers strong, .patient-numbers span { display: block; }
.patient-numbers strong { color: var(--primary); }
.patient-numbers span { font-size: 11px; color: var(--muted); }
.patient-body { display: none; border-top: 1px solid var(--line); padding: 22px; background: #fbfdfd; }
.patient-body.is-open { display: block; }
.patient-notes { padding: 14px; background: var(--warning-soft); border-radius: 13px; color: #6d531e; margin-bottom: 15px; }
.card-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.assignment-list, .session-list { display: grid; gap: 9px; }
.assignment-row { display: grid; grid-template-columns: minmax(0,1fr) auto auto; gap: 14px; align-items: center; background: white; border: 1px solid var(--line); border-radius: 15px; padding: 14px; }
.assignment-row strong, .assignment-row span, .assignment-row small { display: block; }
.assignment-row span, .assignment-row small { color: var(--muted); font-size: 12px; margin-top: 4px; }
.assignment-result { text-align: right; }
.session-row { display: grid; grid-template-columns: minmax(0,1.5fr) repeat(3, auto); gap: 14px; align-items: center; background: white; border: 1px solid var(--line); border-radius: 15px; padding: 13px; }
.session-row strong, .session-row span { display: block; }
.session-row span { font-size: 11px; color: var(--muted); margin-top: 3px; }
.empty-state { background: white; border: 1px dashed #b8ccce; border-radius: 22px; padding: 45px; text-align: center; color: var(--muted); }

.app-dialog { width: min(680px, calc(100% - 24px)); border: 0; border-radius: 24px; padding: 0; box-shadow: 0 30px 100px rgba(0,0,0,.25); }
.app-dialog::backdrop { background: rgba(8,40,46,.65); backdrop-filter: blur(3px); }
.dialog-content { padding: 28px; display: grid; gap: 17px; }
.dialog-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.dialog-heading h2 { font-size: 30px; margin-bottom: 5px; }
.dialog-heading p { color: var(--muted); margin: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 10px; }

.safety-banner { background: var(--warning-soft); border: 1px solid #edd69e; color: #6d531e; border-radius: 18px; padding: 16px 18px; line-height: 1.55; margin-bottom: 24px; }
.exercise-card-grid { display: grid; gap: 16px; }
.exercise-plan-card { display: grid; grid-template-columns: auto minmax(0,1fr) auto; gap: 18px; align-items: center; background: white; border: 1px solid var(--line); border-radius: 22px; padding: 22px; box-shadow: 0 10px 30px rgba(12,64,73,.05); }
.exercise-icon { width: 58px; height: 58px; border-radius: 18px; display: grid; place-items: center; background: var(--accent-soft); color: var(--primary); font-size: 30px; }
.exercise-card-content h2 { margin: 5px 0 8px; }
.exercise-card-content p { color: var(--muted); margin-bottom: 10px; }
.exercise-meta { font-size: 12px; color: var(--success); font-weight: 900; text-transform: uppercase; letter-spacing: .07em; }
.therapist-note { background: var(--warning-soft); border-radius: 12px; padding: 10px 12px; font-size: 13px; color: #6d531e; }
.exercise-history { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 13px; font-size: 13px; color: var(--muted); }
.exercise-history strong { color: var(--primary); }

.exercise-heading { max-width: 950px; margin-bottom: 25px; }
.exercise-heading h1 { font-size: clamp(36px, 5vw, 56px); margin-bottom: 14px; }
.exercise-heading p { color: var(--muted); font-size: 17px; }
.plan-pill { display: inline-flex; background: var(--accent-soft); color: var(--success); border-radius: 99px; padding: 8px 13px; font-weight: 900; font-size: 13px; }
.preflight-card { display: grid; grid-template-columns: minmax(0,1.25fr) minmax(270px,.75fr); gap: 30px; background: white; border: 1px solid var(--line); border-radius: 24px; padding: clamp(24px, 4vw, 38px); box-shadow: var(--shadow); }
.preflight-card ol { padding-left: 20px; color: var(--muted); line-height: 1.8; }
.pain-box { border-radius: 18px; background: var(--surface-alt); padding: 20px; display: grid; gap: 16px; align-content: start; }
.camera-workspace { display: grid; grid-template-columns: minmax(0, 2fr) minmax(280px, .75fr); gap: 18px; align-items: start; }
.camera-panel, .live-panel { background: white; border: 1px solid var(--line); border-radius: 22px; overflow: hidden; box-shadow: 0 12px 35px rgba(12,64,73,.07); }
.camera-stage { position: relative; background: #062d33; aspect-ratio: 16/9; overflow: hidden; display: grid; place-items: center; }
.camera-stage video, .camera-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; transform: scaleX(-1); }
.camera-stage canvas { z-index: 2; pointer-events: none; }
.camera-badge { position: absolute; z-index: 4; left: 14px; top: 14px; border-radius: 99px; padding: 8px 12px; background: rgba(0,0,0,.62); color: white; font-weight: 800; font-size: 12px; }
.camera-badge.ready { background: rgba(24,122,101,.88); }
.camera-badge.warn { background: rgba(163,107,8,.9); }
.camera-controls { display: flex; justify-content: flex-end; gap: 10px; padding: 14px; }
.live-panel { padding: 18px; position: sticky; top: 96px; }
.live-feedback { min-height: 105px; border-radius: 17px; padding: 17px; background: var(--surface-alt); display: flex; flex-direction: column; justify-content: center; }
.live-feedback span, .live-feedback strong { display: block; }
.live-feedback span { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; font-weight: 900; }
.live-feedback strong { font-size: 20px; margin-top: 7px; }
.live-feedback.warn { background: var(--warning-soft); color: #6d531e; }
.live-feedback.good { background: var(--accent-soft); color: #185c50; }
.live-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 14px 0; }
.live-metrics article { border: 1px solid var(--line); border-radius: 15px; padding: 14px; }
.live-metrics strong, .live-metrics span { display: block; }
.live-metrics strong { color: var(--primary); font-size: 25px; }
.live-metrics span { color: var(--muted); font-size: 11px; margin-top: 3px; }
.progress-shell { height: 10px; background: #e4eeee; border-radius: 99px; overflow: hidden; }
.progress-shell > div { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); transition: width .3s ease; }
.current-set { text-align: center; color: var(--muted); font-size: 13px; font-weight: 800; margin: 10px 0 15px; }
.summary-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.summary-grid div { background: var(--surface-alt); border-radius: 15px; padding: 15px; text-align: center; }
.summary-grid strong, .summary-grid span { display: block; }
.summary-grid strong { color: var(--primary); font-size: 26px; }
.summary-grid span { color: var(--muted); font-size: 12px; }

@media (max-width: 1000px) {
    .hero-grid, .camera-workspace, .preflight-card, .two-column { grid-template-columns: 1fr; }
    .hero-card { min-height: 430px; }
    .live-panel { position: static; }
    .patient-summary { grid-template-columns: auto minmax(0,1fr) auto; }
    .patient-numbers { grid-column: 2 / 3; justify-content: start; text-align: left; }
    .patient-summary > .icon-button { grid-column: 3; grid-row: 1; }
}

@media (max-width: 720px) {
    .topbar { min-height: 68px; padding: 10px 14px; }
    .brand-mark { width: 42px; height: 42px; }
    .brand small { display: none; }
    .topnav { gap: 10px; }
    .topnav a { font-size: 12px; }
    .page-shell { width: min(100% - 20px, 1380px); padding: 27px 0 45px; }
    .footer { flex-direction: column; padding: 18px; }
    .hero-grid { padding-top: 10px; }
    .hero-card { min-height: 390px; border-radius: 26px; }
    .feature-grid, .stats-grid { grid-template-columns: 1fr; }
    .dashboard-heading { align-items: stretch; flex-direction: column; }
    .patient-summary { grid-template-columns: auto minmax(0,1fr) auto; gap: 12px; }
    .patient-numbers { grid-column: 1 / -1; grid-template-columns: repeat(3,1fr); width: 100%; padding-top: 8px; border-top: 1px solid var(--line); }
    .patient-body { padding: 14px; }
    .assignment-row { grid-template-columns: minmax(0,1fr) auto; }
    .assignment-result { grid-column: 1; text-align: left; }
    .assignment-row form { grid-column: 2; grid-row: 1; }
    .session-row { grid-template-columns: 1fr 1fr; }
    .session-row > div:first-child { grid-column: 1 / -1; }
    .exercise-plan-card { grid-template-columns: auto minmax(0,1fr); padding: 17px; }
    .exercise-plan-card > .btn { grid-column: 1 / -1; }
    .exercise-icon { width: 48px; height: 48px; }
    .camera-stage { aspect-ratio: 9/16; max-height: 72vh; }
    .camera-controls { display: grid; grid-template-columns: 1fr 1fr; }
    .live-metrics { grid-template-columns: repeat(2,1fr); }
    .form-grid, .summary-grid { grid-template-columns: 1fr; }
    .dialog-content { padding: 20px; }
    .dialog-actions { flex-direction: column-reverse; }
    .dialog-actions .btn { width: 100%; }
}

.demo-access-box { margin-top: 18px; padding: 16px; background: var(--surface-alt); border: 1px solid var(--line); border-radius: 16px; }
.demo-access-box p { margin-bottom: 10px; }
.inline-code { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.inline-code strong { font-size: 22px; letter-spacing: .08em; }
.helper-text { color: var(--muted); font-size: 13px; line-height: 1.55; }
.current-code { margin-top: 10px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 14px; }
.current-code strong { font-size: 18px; letter-spacing: .08em; color: var(--primary); }