/* ============================================================
   Metal Web Joist Span Calculator — style.css
   ============================================================ */

/* Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #eef2f7;
  color: #2c3e50;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
.header {
  background: linear-gradient(135deg, #1a2a4a 0%, #2c4a7c 60%, #1a6a9a 100%);
  color: #fff;
  padding: 18px 28px 14px;
  box-shadow: 0 3px 12px rgba(0,0,0,0.3);
}
.header-inner { max-width: 1100px; margin: 0 auto; }
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.logo-block {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-icon {
  font-size: 2.2rem;
  opacity: 0.85;
}
.logo-img {
  height: 54px;
  width: auto;
  object-fit: contain;
  /* 흰 배경 PNG → screen 블렌드로 흰 배경 투명하게 처리 */
  mix-blend-mode: screen;
  border-radius: 4px;
}
.logo-main {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.logo-sub {
  font-size: 0.85rem;
  opacity: 0.75;
  margin-top: 2px;
}
.badge-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.badge-blue  { background: rgba(100,160,255,0.25); border: 1px solid rgba(100,160,255,0.5); }
.badge-green { background: rgba(80,200,120,0.25);  border: 1px solid rgba(80,200,120,0.5); }
.badge-gray  { background: rgba(200,210,220,0.2);  border: 1px solid rgba(200,210,220,0.4); }
.header-desc {
  margin-top: 8px;
  font-size: 0.8rem;
  opacity: 0.65;
  letter-spacing: 0.3px;
}

/* ===== MAIN GRID ===== */
.main-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
  padding: 22px 24px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

/* ===== PANEL ===== */
.panel {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.09);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ===== SECTION TITLE ===== */
.section-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #2c4a7c;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 2px solid #e8eef5;
}
.section-icon { margin-right: 5px; }

/* ===== DIVIDER ===== */
.divider {
  height: 1px;
  background: #eef2f7;
  margin: 4px 0;
}

/* ===== FORM ELEMENTS ===== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
label {
  font-size: 0.78rem;
  font-weight: 600;
  color: #4a5568;
}
.input-unit-wrap {
  display: flex;
  align-items: center;
  border: 1.5px solid #cbd5e0;
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.input-unit-wrap:focus-within {
  border-color: #2c4a7c;
  box-shadow: 0 0 0 3px rgba(44,74,124,0.12);
}
.num-input {
  flex: 1;
  border: none;
  outline: none;
  padding: 7px 10px;
  font-size: 0.92rem;
  font-weight: 600;
  color: #2c3e50;
  background: transparent;
  width: 0; /* flex에서 축소 허용 */
}
.unit {
  padding: 6px 10px;
  font-size: 0.75rem;
  color: #718096;
  background: #f7fafc;
  border-left: 1px solid #e2e8f0;
  white-space: nowrap;
}
.select-control {
  width: 100%;
  padding: 8px 10px;
  border: 1.5px solid #cbd5e0;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #2c3e50;
  background: #fff;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}
.select-control:focus {
  border-color: #2c4a7c;
  box-shadow: 0 0 0 3px rgba(44,74,124,0.12);
}

/* ===== EI HINT ===== */
.ei-hint {
  font-size: 0.75rem;
  color: #718096;
  padding: 2px 4px;
  text-align: right;
}

/* ===== TOTAL LOAD BAR ===== */
.total-load-bar {
  background: linear-gradient(90deg, #eef2f7, #f0f4f8);
  border: 1px solid #d0daea;
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 0.83rem;
  font-weight: 600;
  color: #2c4a7c;
}
.total-load-bar span {
  font-size: 1rem;
  color: #c0392b;
  font-weight: 700;
}

/* ===== SPACING VISUAL ===== */
.spacing-visual {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 2px;
}
.spacing-bar {
  flex: 1;
  height: 4px;
  background: linear-gradient(90deg, #2c4a7c, #1a6a9a);
  border-radius: 2px;
}
.spacing-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: #2c4a7c;
  background: #eef2f7;
  padding: 3px 10px;
  border-radius: 12px;
  white-space: nowrap;
}

/* ===== RESULT BOX ===== */
.result-box {
  display: flex;
  align-items: baseline;
  gap: 8px;
  background: linear-gradient(135deg, #1a2a4a, #2c4a7c);
  border-radius: 10px;
  padding: 16px 20px;
  box-shadow: 0 4px 14px rgba(44,74,124,0.25);
}
.result-value {
  font-size: 2.6rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
  line-height: 1;
}
.result-unit {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  font-weight: 500;
}
.result-sub {
  font-size: 0.78rem;
  color: #718096;
  text-align: center;
  padding: 2px 0;
}

/* ===== JOIST DIAGRAM ===== */
.joist-diagram-wrap {
  background: #f0f4f8;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 4px;
  overflow: hidden;
}
.joist-diagram-wrap svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== CALC STEPS ===== */
.calc-steps {
  background: #f8fafd;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 0.83rem;
  line-height: 1.9;
  color: #2c3e50;
  min-height: 120px;
}
.calc-step-placeholder {
  color: #a0aec0;
  font-style: italic;
}
.step-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  border-bottom: 1px dashed #e2e8f0;
  padding: 3px 0;
}
.step-row:last-child { border-bottom: none; }
.step-label { color: #4a5568; font-weight: 500; }
.step-val   { font-weight: 700; color: #2c4a7c; white-space: nowrap; }
.step-formula {
  font-style: italic;
  color: #718096;
  font-size: 0.78rem;
  display: block;
  padding: 2px 6px;
  background: #eef2f7;
  border-radius: 4px;
  margin: 2px 0;
}
.step-govern {
  margin-top: 6px;
  padding: 6px 10px;
  border-radius: 6px;
  background: #fff3cd;
  border: 1px solid #f0c040;
  color: #856404;
  font-weight: 700;
  font-size: 0.82rem;
  line-height: 1.7;
}

/* ===== 검산 블록 ===== */
.step-verify {
  margin-top: 10px;
  border: 1.5px solid #b8d4f0;
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.81rem;
}
.verify-title {
  background: #2c4a7c;
  color: #fff;
  padding: 5px 12px;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.3px;
}
.verify-body {
  background: #f0f6ff;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  color: #2c3e50;
  line-height: 1.6;
}
.verify-formula {
  font-style: italic;
  color: #4a5568;
  background: #dce9f8;
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 0.78rem;
}
.verify-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  border-bottom: 1px dashed #c8daf0;
  padding: 2px 0;
}
.verify-row:last-of-type { border-bottom: none; }
.verify-row span:first-child { color: #4a5568; }
.verify-row span:last-child  { font-weight: 700; color: #1a5276; white-space: nowrap; }
.verify-note {
  margin-top: 6px;
  font-weight: 600;
  color: #155724;
  background: #d4edda;
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 0.79rem;
  line-height: 1.7;
}
.verify-concept {
  background: #fffbea;
  border: 1px solid #f0c040;
  border-radius: 5px;
  padding: 7px 10px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: #5a4000;
}
.verify-sub-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #2c4a7c;
  margin-top: 6px;
  padding: 3px 0;
  border-bottom: 1px solid #c8daf0;
}
/* 검산 내부 테이블 */
.verify-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.77rem;
  margin-top: 4px;
}
.verify-table th {
  background: #dce9f8;
  color: #1a3a6a;
  font-weight: 700;
  padding: 5px 6px;
  text-align: center;
  border: 1px solid #b8d4f0;
}
.verify-table td {
  padding: 5px 6px;
  text-align: center;
  border: 1px solid #d0e4f5;
  color: #2c3e50;
}
.verify-table tbody tr:nth-child(even) { background: #f0f6ff; }
/* 현재 선택된 행 강조 */
.verify-row-current {
  background: #fff3cd !important;
  font-weight: 700;
}
.verify-row-current td { color: #856404; font-weight: 700; }

/* ===== CHECK TABLE ===== */
.check-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}
.check-table th {
  background: #eef2f7;
  padding: 8px 10px;
  text-align: center;
  font-weight: 700;
  color: #2c4a7c;
  border-bottom: 2px solid #d0daea;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.check-table td {
  padding: 9px 10px;
  text-align: center;
  border-bottom: 1px solid #e8eef5;
  color: #2c3e50;
  font-weight: 500;
}
.check-table tr:last-child td { border-bottom: none; }
.judge-ok {
  display: inline-block;
  padding: 3px 12px;
  background: #d4edda;
  color: #155724;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.8rem;
}
.judge-ng {
  display: inline-block;
  padding: 3px 12px;
  background: #f8d7da;
  color: #721c24;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.8rem;
}
.judge-pending {
  display: inline-block;
  padding: 3px 12px;
  background: #e9ecef;
  color: #6c757d;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.8rem;
}

/* ===== 스팬 배치도 ===== */
#spanLayoutWrap {
  background: #ffffff;
  border-radius: 4px;
}
#spanLayoutSVG {
  width: 100%;
  display: block;
  border-radius: 4px;
  background: #ffffff;
}
#spanLayoutDesc {
  font-size: 0.76rem;
  color: #4a5568;
  margin-top: 5px;
  line-height: 1.7;
  padding: 4px 2px;
}
#spanLayoutDesc strong {
  color: #2c4a7c;
  font-weight: 700;
}

/* ===== EI 자동 산출 박스 ===== */
.ei-auto-box {
  background: linear-gradient(135deg, #eef6ff 0%, #e8f0fb 100%);
  border: 1px solid #b8d0f0;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 4px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ei-auto-label {
  font-size: 0.74rem;
  font-weight: 700;
  color: #2c4a7c;
  letter-spacing: 0.2px;
}
.ei-auto-formula {
  font-size: 0.78rem;
  color: #4a5568;
  font-style: italic;
  background: #dce9f8;
  border-radius: 4px;
  padding: 3px 8px;
  display: inline-block;
}
.ei-auto-result {
  font-size: 0.9rem;
  font-weight: 700;
  color: #1a3a6a;
  padding: 2px 0;
}
.ei-auto-btn {
  align-self: flex-start;
  margin-top: 2px;
  padding: 5px 14px;
  font-size: 0.76rem;
  font-weight: 700;
  background: #2c4a7c;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.15s;
}
.ei-auto-btn:hover {
  background: #1a6a9a;
}

/* ===== FOOTER ===== */
.footer {
  background: #1a2a4a;
  color: rgba(255,255,255,0.55);
  font-size: 0.72rem;
  text-align: center;
  padding: 12px 20px;
  margin-top: auto;
  letter-spacing: 0.3px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 800px) {
  .main-grid {
    grid-template-columns: 1fr;
    padding: 14px;
    gap: 14px;
  }
  .form-row { grid-template-columns: 1fr 1fr; }
  .result-value { font-size: 2rem; }
}
@media (max-width: 480px) {
  .header { padding: 14px 16px 10px; }
  .logo-main { font-size: 1.2rem; }
  .badge { font-size: 0.68rem; padding: 3px 9px; }
  .form-row { grid-template-columns: 1fr; }
  .main-grid { padding: 10px; }
  .panel { padding: 16px 14px; }
}