html,
body {
  width: 100%;
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 55%, #eef2ff 100%);
  color: #0f172a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

.fit-tool-shell {
  min-height: 100dvh;
  padding: clamp(12px, 3.5vh, 28px) clamp(12px, 4vw, 20px);
  display: flex;
  justify-content: center;
  align-items: center;
}

.fit-tool-card {
  width: min(100%, 560px);
  margin: 0 auto;
  background: #ffffff;
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.14);
  border: 1px solid #e2e8f0;
  overflow: hidden;
}

.logo-wrap {
  padding: 20px 18px 8px;
  text-align: center;
  background: #ffffff;
}

.brand-logo {
  max-width: 190px;
  width: 48%;
  min-width: 120px;
  height: auto;
  object-fit: contain;
}

.logo-fallback {
  font-size: 2rem;
  line-height: 1;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #2563eb;
}

.fit-tool-header {
  background: #ffffff;
  padding: clamp(18px, 4vw, 24px) clamp(16px, 4vw, 22px);
  text-align: center;
  color: #0f172a;
  border-top: 1px solid #eef2f7;
  border-bottom: 1px solid #eef2f7;
}

.fit-tool-header h3 {
  margin: 0 0 6px;
  font-size: clamp(1.05rem, 2.8vw, 1.9rem);
  letter-spacing: 0.2px;
  color: #1e293b;
}

.fit-tool-header p {
  margin: 0;
  font-size: clamp(0.82rem, 2.1vw, 1rem);
  color: #475569;
  opacity: 1;
}

.fit-tool-body {
  padding: clamp(16px, 4vw, 24px);
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: #1e293b;
}

select,
input[type="number"],
input[type="tel"] {
  width: 100%;
  padding: 12px 13px;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  margin-bottom: 14px;
  font-size: clamp(0.95rem, 2.5vw, 1rem);
  background: #ffffff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

select:focus,
input:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.14);
}

.height-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

#whatsapp-number {
  letter-spacing: 0.4px;
  font-weight: 600;
}

.half-input {
  min-width: 0;
}

.calc-btn {
  width: auto;
  min-width: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: clamp(13px, 3vw, 15px);
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  font-size: clamp(0.95rem, 2.8vw, 1rem);
  cursor: pointer;
  box-shadow: 0 12px 26px rgba(79, 70, 229, 0.3);
  transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
}

.fit-tool-body .calc-btn {
  margin: 4px auto 0;
}

.calc-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.calc-btn:hover:not(:disabled) {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(79, 70, 229, 0.34);
}

.error-msg {
  margin: 12px 0 0;
  color: #b91c1c;
  font-size: 0.88rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 10px 12px;
}

.confirm-container {
  margin-top: 20px;
  padding: 22px 18px;
  background: linear-gradient(180deg, #ecfdf5 0%, #f0fdf4 100%);
  border: 1px solid #86efac;
  border-radius: 12px;
  text-align: center;
  animation: fadeIn 0.4s;
}

.confirm-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
  font-weight: 700;
  color: #065f46;
}

.confirm-container h4 {
  margin: 0 0 6px;
  color: #065f46;
  font-size: 1.05rem;
}

.confirm-container p {
  margin: 0;
  font-size: 0.88rem;
  color: #047857;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 420px) {
  .height-split {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .logo-wrap {
    padding-top: 16px;
  }
}