/* =========================
   RESET TRONG COMPONENT
========================= */

#calculator-tn,
#calculator-tn * {
  box-sizing: border-box;
}

#calculator-tn {
  --primary-tn: #2563eb;
  --primary-dark-tn: #1d4ed8;
  --primary-light-tn: #eff6ff;

  --text-tn: #0f172a;
  --text-soft-tn: #64748b;

  --border-tn: #e2e8f0;
  --background-tn: #f8fafc;
  --white-tn: #ffffff;

  --success-tn: #059669;
  --success-bg-tn: #ecfdf5;

  --danger-tn: #dc2626;
  --danger-bg-tn: #fef2f2;

  width: 100%;
  max-width: 920px;
  margin: 0px auto;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;

  color: var(--text-tn);
  line-height: 1.5;
}

/* =========================
   MAIN CARD
========================= */

.calculator-tn {
  background: var(--white-tn);
  border: 1px solid var(--border-tn);
  border-radius: 24px;
  overflow: hidden;
  box-shadow:
    0 20px 50px rgba(15, 23, 42, 0.08),
    0 2px 8px rgba(15, 23, 42, 0.04);
}

/* =========================
   HEADER
========================= */

.header-tn {
  padding: 42px 42px 34px;
  background:
    radial-gradient(
      circle at 90% 10%,
      rgba(37, 99, 235, 0.16),
      transparent 35%
    ),
    linear-gradient(135deg, #f8fbff 0%, #ffffff 60%);
  border-bottom: 1px solid var(--border-tn);
}

.badge-tn {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  margin-bottom: 14px;

  border-radius: 999px;
  background: var(--primary-light-tn);
  color: var(--primary-tn);

  font-size: 13px;
  font-weight: 700;
}

.title-tn {
  margin: 0;
  color: var(--text-tn);
  font-size: clamp(27px, 4vw, 38px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.description-tn {
  max-width: 650px;
  margin: 12px 0 0;
  color: var(--text-soft-tn);
  font-size: 16px;
}

/* =========================
   CONTENT
========================= */

.content-tn {
  padding: 12px 42px 42px;
}

.section-tn {
  padding: 30px 0;
  border-bottom: 1px solid var(--border-tn);
}

.section-heading-tn > div {
  display: flex;
  align-items: center;
  gap: 12px;
}

.step-tn {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-width: 38px;
  height: 30px;
  padding: 0 9px;

  border-radius: 9px;
  background: var(--primary-light-tn);
  color: var(--primary-tn);

  font-size: 12px;
  font-weight: 800;
}

.section-title-tn {
  margin: 0;
  color: var(--text-tn);
  font-size: 19px;
  font-weight: 750;
}

.section-desc-tn {
  margin: 10px 0 22px;
  color: var(--text-soft-tn);
  font-size: 14px;
}

/* =========================
   SUBJECTS
========================= */

.subjects-tn {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.subject-row-tn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;

  padding: 14px 14px 14px 18px;

  border: 1px solid var(--border-tn);
  border-radius: 14px;
  background: #fff;

  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.subject-row-tn:focus-within {
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}

.subject-name-tn {
  font-size: 14px;
  font-weight: 650;
}

.subject-row-tn .score-input-tn {
  width: 110px;
}

/* =========================
   INPUT
========================= */

.grid-2-tn,
.grid-3-tn {
  display: grid;
  gap: 15px;
}

.grid-2-tn {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3-tn {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field-tn {
  display: block;
}

.label-tn {
  display: block;
  margin-bottom: 8px;

  color: #334155;
  font-size: 14px;
  font-weight: 650;
}

.score-input-tn {
  width: 100%;
  min-height: 48px;

  padding: 11px 13px;

  border: 1px solid var(--border-tn);
  border-radius: 11px;
  outline: none;

  background: #fff;
  color: var(--text-tn);

  font: inherit;
  font-size: 15px;

  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.score-input-tn:hover {
  border-color: #cbd5e1;
}

.score-input-tn:focus {
  border-color: var(--primary-tn);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.11);
}

.score-input-tn.input-error-tn {
  border-color: var(--danger-tn);
  background: var(--danger-bg-tn);
}

.score-input-tn::-webkit-outer-spin-button,
.score-input-tn::-webkit-inner-spin-button {
  margin: 0;
}

.help-tn {
  display: block;
  margin-top: 7px;
  color: var(--text-soft-tn);
  font-size: 12px;
}

/* =========================
   BUTTON
========================= */

.actions-tn {
  display: flex;
  gap: 12px;
  margin-top: 30px;
}

.calculate-btn-tn,
.reset-btn-tn {
  min-height: 52px;
  border: 0;
  border-radius: 12px;

  font-family: inherit;
  font-size: 15px;
  font-weight: 700;

  cursor: pointer;

  transition:
    transform 0.15s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.calculate-btn-tn {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 12px;

  padding: 0 20px;

  background: var(--primary-tn);
  color: #fff;

  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
}

.calculate-btn-tn:hover {
  background: var(--primary-dark-tn);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.26);
}

.calculate-btn-tn:active,
.reset-btn-tn:active {
  transform: translateY(1px);
}

.arrow-tn {
  font-size: 20px;
  line-height: 1;
}

.reset-btn-tn {
  padding: 0 22px;
  background: #f1f5f9;
  color: #475569;
}

.reset-btn-tn:hover {
  background: #e2e8f0;
}

/* =========================
   ERROR
========================= */

.error-tn {
  display: none;

  margin-top: 18px;
  padding: 13px 15px;

  border: 1px solid #fecaca;
  border-radius: 11px;

  background: var(--danger-bg-tn);
  color: #b91c1c;

  font-size: 14px;
  font-weight: 600;
}

.error-tn.show-tn {
  display: block;
}

/* =========================
   RESULT
========================= */

.result-tn {
  display: none;

  margin-top: 28px;
  padding: 28px;

  border: 1px solid #dbeafe;
  border-radius: 18px;

  background:
    linear-gradient(
      135deg,
      #f8fbff 0%,
      #eff6ff 100%
    );
}

.result-tn.show-tn {
  display: block;
  animation: resultAppear-tn 0.3s ease;
}

@keyframes resultAppear-tn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

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

.result-top-tn {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.result-label-tn {
  margin-bottom: 3px;
  color: var(--text-soft-tn);
  font-size: 13px;
  font-weight: 650;
}

.final-score-tn {
  color: var(--primary-tn);
  font-size: 48px;
  font-weight: 850;
  letter-spacing: -0.05em;
  line-height: 1.1;
}

.status-tn {
  display: inline-flex;
  align-items: center;

  padding: 8px 12px;

  border-radius: 999px;
  background: #e2e8f0;
  color: #475569;

  font-size: 13px;
  font-weight: 750;
}

.status-tn.pass-tn {
  background: var(--success-bg-tn);
  color: var(--success-tn);
}

.status-tn.fail-tn {
  background: var(--danger-bg-tn);
  color: var(--danger-tn);
}

/* =========================
   PROGRESS
========================= */

.progress-tn {
  width: 100%;
  height: 8px;

  margin: 20px 0 24px;

  overflow: hidden;

  border-radius: 999px;
  background: #dbeafe;
}

.progress-bar-tn {
  width: 0;
  height: 100%;

  border-radius: inherit;
  background: var(--primary-tn);

  transition: width 0.5s ease;
}

/* =========================
   DETAILS
========================= */

.result-details-tn {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.detail-item-tn {
  padding: 13px;

  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 11px;

  background: rgba(255, 255, 255, 0.65);
}

.detail-item-tn span {
  display: block;
  margin-bottom: 4px;
  color: var(--text-soft-tn);
  font-size: 11px;
}

.detail-item-tn strong {
  color: var(--text-tn);
  font-size: 16px;
}

/* =========================
   NOTICE
========================= */

.notice-tn {
  display: none;

  margin-top: 17px;
  padding: 12px 14px;

  border-radius: 10px;

  font-size: 13px;
  font-weight: 600;
}

.notice-tn.show-tn {
  display: block;
}

.notice-tn.success-tn {
  border: 1px solid #a7f3d0;
  background: var(--success-bg-tn);
  color: #047857;
}

.notice-tn.danger-tn {
  border: 1px solid #fecaca;
  background: var(--danger-bg-tn);
  color: #b91c1c;
}

/* =========================
   FORMULA
========================= */

.formula-tn {
  display: flex;
  align-items: flex-start;
  gap: 13px;

  margin-top: 22px;
  padding: 17px;

  border: 1px dashed #cbd5e1;
  border-radius: 13px;

  background: #fafafa;
  color: var(--text-soft-tn);

  font-size: 13px;
}

.formula-icon-tn {
  display: flex;
  flex: 0 0 25px;
  align-items: center;
  justify-content: center;

  width: 25px;
  height: 25px;

  border-radius: 50%;
  background: #e2e8f0;
  color: #475569;

  font-size: 13px;
  font-weight: 800;
}

.formula-tn strong {
  display: block;
  margin-bottom: 7px;
  color: #334155;
}

.formula-tn p {
  margin: 3px 0;
}

/* =========================
   RESPONSIVE
========================= */

@media (max-width: 768px) {

  #calculator-tn {
    margin: 15px auto;
  }

  .calculator-tn {
    border-radius: 18px;
  }

  .header-tn {
    padding: 30px 22px 25px;
  }

  .content-tn {
    padding: 6px 22px 28px;
  }

  .subjects-tn {
    grid-template-columns: 1fr;
  }

  .grid-3-tn {
    grid-template-columns: 1fr;
  }

  .result-details-tn {
    grid-template-columns: repeat(2, 1fr);
  }

}

@media (max-width: 520px) {

  .grid-2-tn {
    grid-template-columns: 1fr;
  }

  .subject-row-tn {
    align-items: center;
  }

  .subject-row-tn .score-input-tn {
    width: 100px;
  }

  .actions-tn {
    flex-direction: column;
  }

  .reset-btn-tn {
    width: 100%;
  }

  .result-tn {
    padding: 21px 17px;
  }

  .result-top-tn {
    flex-direction: column;
    gap: 10px;
  }

  .final-score-tn {
    font-size: 43px;
  }

}

@media (max-width: 380px) {

  .result-details-tn {
    grid-template-columns: 1fr;
  }

}