:root {
  --bg: #f4f6fa;
  --bg-glow: rgba(15, 118, 110, .07);
  --card: #ffffff;
  --field-bg: #ffffff;
  --subtle: #f6f8fb;
  --ink: #101828;
  --muted: #5c6676;
  --line: #e3e8ef;
  --line-strong: #cbd4e0;
  --primary: #0f766e;
  --primary-hover: #0d685f;
  --primary-ink: #ffffff;
  --primary-soft: #ccfbf1;
  --primary-faint: rgba(15, 118, 110, .08);
  --chip-ink: #115e59;
  --danger: #b91c1c;
  --ok: #15803d;
  --radius: 16px;
  --radius-control: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 12px 32px -8px rgba(16, 24, 40, .08);
  --focus-ring: 0 0 0 3px var(--primary-soft);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1422;
    --bg-glow: rgba(45, 212, 191, .06);
    --card: #16202f;
    --field-bg: #101b2b;
    --subtle: #121d2e;
    --ink: #e7ebf4;
    --muted: #97a3b6;
    --line: #293650;
    --line-strong: #3a4a68;
    --primary: #2dd4bf;
    --primary-hover: #46dcc9;
    --primary-ink: #052420;
    --primary-soft: #134e48;
    --primary-faint: rgba(45, 212, 191, .09);
    --chip-ink: #7dece0;
    --danger: #f87171;
    --ok: #4ade80;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 14px 36px -8px rgba(0, 0, 0, .5);
    --focus-ring: 0 0 0 3px var(--primary-soft);
  }
}
:root[data-theme="dark"] {
  --bg: #0d1422;
  --bg-glow: rgba(45, 212, 191, .06);
  --card: #16202f;
  --field-bg: #101b2b;
  --subtle: #121d2e;
  --ink: #e7ebf4;
  --muted: #97a3b6;
  --line: #293650;
  --line-strong: #3a4a68;
  --primary: #2dd4bf;
  --primary-hover: #46dcc9;
  --primary-ink: #052420;
  --primary-soft: #134e48;
  --primary-faint: rgba(45, 212, 191, .09);
  --chip-ink: #7dece0;
  --danger: #f87171;
  --ok: #4ade80;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 14px 36px -8px rgba(0, 0, 0, .5);
  --focus-ring: 0 0 0 3px var(--primary-soft);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  background-image: radial-gradient(900px 360px at 50% -120px, var(--bg-glow), transparent 70%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: "IBM Plex Sans Thai", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--primary-soft); color: var(--chip-ink); }

.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px 16px 56px;
}

/* Brand header */
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
}
.brand-badge {
  width: 48px;
  height: 48px;
  flex: none;
  display: block;
}
.brand h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 0;
}
.brand .sub { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.theme-toggle {
  margin-left: auto;
  flex: none;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.theme-toggle:hover { border-color: var(--line-strong); color: var(--ink); }
.theme-toggle:focus-visible { outline: none; border-color: var(--primary); box-shadow: var(--focus-ring); }
.theme-toggle svg { width: 20px; height: 20px; }

/* Steps */
.steps {
  list-style: none;
  display: flex;
  gap: 8px;
  padding: 0;
  margin: 0 0 18px;
}
.step {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  border-top: 3px solid var(--line);
  border-radius: 2px 2px 0 0;
  padding-top: 10px;
  transition: border-color .25s, color .25s;
}
.step span {
  width: 21px; height: 21px;
  border-radius: 50%;
  background: var(--subtle);
  border: 1px solid var(--line-strong);
  color: var(--muted);
  display: grid; place-items: center;
  font-size: 11px; font-weight: 600;
  flex: none;
  transition: background .25s, color .25s, border-color .25s;
}
.step.is-active { color: var(--ink); font-weight: 600; border-top-color: var(--primary); }
.step.is-active span { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.step.is-done { color: var(--muted); border-top-color: var(--primary); }
.step.is-done span { background: var(--primary-soft); border-color: transparent; color: var(--chip-ink); }

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 24px;
}
@media (min-width: 560px) {
  .card { padding: 30px 28px; }
}
.card h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.lead { color: var(--muted); font-size: 14.5px; margin: 0 0 18px; }
.hidden { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  .card {
    animation: card-rise .35s cubic-bezier(.16, 1, .3, 1);
  }
  @keyframes card-rise {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: none; }
  }
}

/* Consent */
.consent-box {
  background: var(--subtle);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
  max-height: 320px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.consent-box p { margin: 0 0 12px; }
.consent-box p:last-child { margin-bottom: 0; }
.consent-box b { color: var(--ink); }
.muted { color: var(--muted); font-size: 13px; }

.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  cursor: pointer;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--field-bg);
  transition: border-color .15s, background .15s;
}
.check:hover { border-color: var(--line-strong); }
.check:has(input:checked) { border-color: var(--primary); background: var(--primary-faint); }
.check:has(input:focus-visible) { box-shadow: var(--focus-ring); }
.check input { margin-top: 3px; width: 18px; height: 18px; flex: none; accent-color: var(--primary); }

/* Fields */
.field { margin-bottom: 15px; }
.row { display: flex; gap: 12px; }
.row .field { flex: 1; }
label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.req { color: var(--danger); }
.hint { font-size: 12px; color: var(--muted); margin: 6px 0 0; }
.section-head {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 26px 0 2px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.section-sub { font-size: 12px; color: var(--muted); margin: 0 0 14px; }
input[readonly] { background: var(--subtle); color: var(--muted); cursor: default; }
select:disabled { opacity: .6; cursor: not-allowed; background: var(--subtle); }

input, select, textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  font: inherit;
  color: var(--ink);
  background: var(--field-bg);
  transition: border-color .15s, box-shadow .15s;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: .75; }
input:hover:not(:focus):not([readonly]):not(:disabled),
select:hover:not(:focus):not(:disabled),
textarea:hover:not(:focus) { border-color: var(--line-strong); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--focus-ring);
}
textarea { resize: vertical; }
.invalid { border-color: var(--danger) !important; }

/* Goal chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; margin: 0; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span {
  display: inline-block;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  background: var(--field-bg);
  cursor: pointer;
  user-select: none;
  transition: border-color .15s, background .15s, color .15s, transform .1s;
}
.chip span:hover { border-color: var(--line-strong); }
.chip span:active { transform: scale(.97); }
.chip input:checked + span {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--chip-ink);
  font-weight: 600;
}
.chip input:focus-visible + span { box-shadow: var(--focus-ring); }

/* OTP */
.otp-input {
  letter-spacing: 12px;
  text-align: center;
  font-size: 26px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.dev-banner {
  background: #fef9c3;
  border: 1px solid #fde047;
  color: #854d0e;
  padding: 10px 12px;
  border-radius: var(--radius-control);
  font-size: 13px;
  margin-bottom: 14px;
}

/* Buttons */
.actions { display: flex; gap: 10px; margin-top: 20px; }
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  flex: 1;
  transition: background .15s, border-color .15s, opacity .15s, transform .1s, box-shadow .15s;
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn.primary {
  background: var(--primary);
  color: var(--primary-ink);
  box-shadow: 0 1px 2px rgba(16, 24, 40, .1), inset 0 1px 0 rgba(255, 255, 255, .12);
}
.btn.primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn.ghost { background: var(--card); border-color: var(--line); color: var(--ink); flex: 0 0 auto; }
.btn.ghost:hover:not(:disabled) { border-color: var(--line-strong); }
.btn.link { background: none; color: var(--primary); border: none; flex: none; padding: 8px; font-weight: 500; text-decoration: underline; text-underline-offset: 3px; margin: 8px auto 0; display: block; box-shadow: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Message */
.msg { text-align: center; font-size: 14px; margin: 14px 0 0; min-height: 20px; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--ok); }

/* Success */
.success { text-align: center; }
.tick {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 34px;
  display: grid; place-items: center;
  margin: 6px auto 16px;
}
@media (prefers-reduced-motion: no-preference) {
  .success:not(.hidden) .tick { animation: tick-pop .4s cubic-bezier(.16, 1, .3, 1); }
  @keyframes tick-pop {
    from { opacity: 0; transform: scale(.7); }
    to { opacity: 1; transform: none; }
  }
}

/* Footer */
.foot {
  margin-top: 26px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}
.foot p { margin: 0 0 6px; }

@media (max-width: 420px) {
  .row { flex-direction: column; gap: 0; }
}