:root{
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #e6e8ec;
  --text: #1a1d23;
  --muted: #6b7280;
  --primary: #111827;
  --primary-hover: #000;
  --accent: #ff6b35;
  --success-bg: #ecfdf5;
  --success-fg: #065f46;
  --error-bg: #fef2f2;
  --error-fg: #991b1b;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(16,24,40,.04), 0 8px 24px rgba(16,24,40,.06);
  --focus: 0 0 0 3px rgba(17,24,39,.12);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.page{
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.hero{
  text-align: center;
  margin-bottom: 28px;
}
.brand{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;letter-spacing:.04em;
  color:var(--muted);text-transform:uppercase;
  margin-bottom:18px;
}
.brand-dot{
  width:8px;height:8px;border-radius:50%;background:var(--accent);
}
.hero h1{
  margin: 0 0 8px;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -.02em;
}
.lead{
  margin: 0 auto;
  max-width: 480px;
  color: var(--muted);
  font-size: 15px;
}

.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}

/* tabs */
.tabs{
  display:flex;
  gap:6px;
  background:#eef0f4;
  padding:5px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}
.tab{
  flex:1;
  font:inherit;
  font-weight:600;
  font-size:14px;
  padding:10px 14px;
  background:transparent;
  border:0;
  border-radius:8px;
  color:var(--muted);
  cursor:pointer;
  transition: background .15s, color .15s, box-shadow .15s;
}
.tab:hover{color:var(--text)}
.tab.is-active{
  background:#fff;
  color:var(--text);
  box-shadow: 0 1px 2px rgba(16,24,40,.06);
}

/* form panel toggle */
.form-panel{display:none}
.form-panel.is-active{display:block}

/* placeholder block */
.placeholder{
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 28px;
  text-align:center;
  color: var(--muted);
  font-size: 14px;
  background: #fafbfc;
}

.section + .section{
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.section-title{
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}

.grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 540px){
  .grid{grid-template-columns: 1fr}
  .card{padding:20px}
  .page{padding:20px 14px 40px}
}

.field{display:flex;flex-direction:column;gap:6px}
.label{font-size:13px;font-weight:600;color:var(--text)}

input[type=text], input[type=tel], input[type=email], input[type=number], select, textarea{
  width:100%;
  font:inherit;
  color:var(--text);
  background:#fff;
  border:1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus{
  outline:none;
  border-color: var(--primary);
  box-shadow: var(--focus);
}
textarea{resize:vertical;min-height:96px}

/* star rating */
.rating{
  display:flex;
  flex-direction: row-reverse;
  justify-content: flex-end;
  align-self: flex-start;
  gap:4px;
  font-size: 34px;
  line-height:1;
}
.rating input{position:absolute;opacity:0;pointer-events:none}
.rating label{
  cursor:pointer;
  color:#d6d8de;
  transition:color .15s, transform .1s;
  user-select:none;
}
.rating label:hover,
.rating label:hover ~ label,
.rating input:checked ~ label{
  color: #f5b301;
}
.rating label:active{transform: scale(1.1)}

/* alerts */
.alert{
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 14px;
  border:1px solid transparent;
}
.alert-success{background:var(--success-bg);color:var(--success-fg);border-color:#a7f3d0}
.alert-error{background:var(--error-bg);color:var(--error-fg);border-color:#fecaca}

.actions{
  margin-top: 28px;
  display:flex;
  justify-content:flex-end;
}
.btn{
  font:inherit;
  font-weight:600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border:1px solid transparent;
  cursor:pointer;
  transition: background .15s, transform .05s;
}
.btn:active{transform: translateY(1px)}
.btn-primary{
  background: var(--primary);
  color:#fff;
}
.btn-primary:hover{background: var(--primary-hover)}
.btn[disabled]{opacity:.6;cursor:not-allowed}

.foot{
  text-align:center;
  margin-top: 24px;
  color: var(--muted);
}

/* ---- anket blokları ---- */
.section-lead{
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.questions{display:flex;flex-direction:column;gap:26px}
.question-block{display:flex;flex-direction:column;gap:12px}

.question{
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.005em;
}
.question-lead{
  margin: -4px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* generic option group (radio chips / emoji cards) */
.options{display:flex;flex-wrap:wrap;gap:8px}
.option{position:relative;cursor:pointer;display:inline-flex}
.option input{
  position:absolute;
  inset:0;
  opacity:0;
  cursor:pointer;
  margin:0;
  z-index:1;
}
.option-body{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius-sm);
  transition: border-color .15s, background .15s, box-shadow .15s, transform .05s;
  user-select:none;
}
.option:hover .option-body{border-color:#cfd3da}
.option input:focus-visible + .option-body{
  border-color: var(--primary);
  box-shadow: var(--focus);
}
.option input:checked + .option-body{
  border-color: var(--primary);
  background: #f5f6f8;
  box-shadow: inset 0 0 0 1px var(--primary);
}

/* emoji variant (kurulum deneyimi) */
.emoji-options{
  display:grid;
  grid-template-columns: repeat(5, 1fr);
  gap:8px;
}
.emoji-options .option{width:100%}
.emoji-body{
  flex-direction: column;
  gap:6px;
  padding: 14px 8px;
  width:100%;
}
.emoji{font-size: 30px; line-height: 1}
.opt-text{font-size: 12px; color: var(--muted); font-weight: 500; text-align:center}
.option input:checked + .emoji-body .opt-text{color: var(--text); font-weight: 600}

/* chip variant */
.chip-body{
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

/* checkbox listesi */
.check-list{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.check-item{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.check{
  display:flex;
  align-items:center;
  gap:10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background:#fff;
  cursor:pointer;
  transition: border-color .15s, background .15s;
}
.check:hover{border-color:#cfd3da}
.check input{
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor:pointer;
  flex: 0 0 auto;
  margin:0;
}
.check-body{font-size: 14px; color: var(--text)}
.check.is-checked{
  border-color: var(--primary);
  background: #f5f6f8;
}

/* koşullu açılan blok */
.reveal{
  display:none;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: #fafbfc;
  border: 1px solid var(--border);
}
.reveal.is-open{display:block}

.expl-input{
  display:block;
  margin-left: 28px;
  font-size: 13px;
  min-height: 56px;
}
.expl-input[hidden]{display:none}

/* thanks screen */
.thanks{
  text-align:center;
  padding: 56px 28px;
}
.thanks-icon{
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--success-bg);
  color: var(--success-fg);
  font-size: 38px;
  line-height: 72px;
  margin: 0 auto 20px;
  border: 1px solid #a7f3d0;
}
.thanks h1{
  margin: 0 0 12px;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  letter-spacing: -.01em;
}
.thanks-lead{
  margin: 0 auto 8px;
  max-width: 440px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
}
.thanks-sub{
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* validation error */
.form-error{
  display:block;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
}
.question-block.has-error .question{ color: var(--error-fg); }
.question-block.has-error .option-body,
.question-block.has-error .check,
.question-block.has-error .reveal{ border-color:#fecaca; background:#fff5f5; }
.question-block.has-error .rating label{ color:#fecaca; }
textarea.expl-error{ border-color:#fecaca; background:#fff5f5; }

/* disclaimer */
.disclaimer{
  margin: 24px 0 0;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  line-height: 1.5;
}

@media (max-width: 540px){
  .emoji-options{gap:4px}
  .emoji-body{padding: 10px 4px; gap:4px}
  .emoji{font-size: 24px}
  .opt-text{font-size: 10px}
  .chip-body{padding: 9px 12px; font-size: 13px}
  .rating{font-size: 28px}
}