/* 3D 그림자 시뮬레이터(Shadow Simulator) 전용 스타일
   테마: CLAUDE.md 5-4 "전문가용 시공 도구" 계열의 절제된 다크모드를 이어가되,
   태양/그림자 주제에 맞춰 오렌지(태양) 포인트 컬러를 씁니다. 3D 캔버스가 화면의
   주인공이라 다른 계산기류(max-width 680px)보다 넓은 레이아웃을 씁니다. */

:root {
  --ss-bg: #0f172a;
  --ss-card-bg: #1e293b;
  --ss-border: #334155;
  --ss-text: #e2e8f0;
  --ss-text-muted: #94a3b8;
  --ss-accent: #fb923c;
  --ss-accent-dark: #f97316;
  --ss-radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: var(--ss-bg);
  color: var(--ss-text);
  line-height: 1.6;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 16px;
  background: var(--ss-bg);
}

@media (min-width: 768px) {
  .top-bar {
    width: fit-content;
    height: auto;
    padding: 12px 16px 0;
    background: transparent;
  }
}

.back-link {
  display: inline-block;
  padding: 6px 14px;
  background: var(--ss-card-bg);
  border: 1px solid var(--ss-border);
  border-radius: 999px;
  color: var(--ss-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
}

.back-link:hover {
  color: var(--ss-accent);
  border-color: var(--ss-accent);
}

.page-header {
  text-align: center;
  padding: 10px 16px 16px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-family: "Encode Sans Expanded", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: -0.01em;
  color: var(--ss-accent);
}

.subtitle {
  margin: 0;
  color: var(--ss-text-muted);
  font-size: 1.1rem;
}

.tagline-extra {
  margin: 6px 0 0;
  color: var(--ss-text-muted);
  font-size: 0.9rem;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

/* 컨트롤 패널(입력 폼)과 3D 뷰포트를 좁은 화면에서는 세로로 쌓고,
   넓은 화면(>=1000px)에서는 좌우로 나란히 배치합니다. */
.ss-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}

@media (min-width: 1000px) {
  .ss-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .ss-controls {
    flex: 0 0 360px;
  }

  .ss-viewport {
    flex: 1;
    position: sticky;
    top: 76px;
  }
}

.ss-card {
  background: var(--ss-card-bg);
  border: 1px solid var(--ss-border);
  border-radius: var(--ss-radius);
  padding: 20px;
}

.ss-card + .ss-card {
  margin-top: 16px;
}

.ss-card-heading {
  margin: 0 0 14px;
  font-size: 1rem;
  color: var(--ss-accent);
}

.ss-hint {
  margin: -6px 0 14px;
  font-size: 0.8rem;
  color: var(--ss-text-muted);
}

.ss-field-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.ss-field-row[hidden] {
  display: none;
}

.ss-field-row + .ss-field-row {
  margin-top: 14px;
}

.ss-field {
  flex: 1;
  min-width: 100px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ss-field[hidden] {
  display: none;
}

.ss-field-btn {
  justify-content: flex-end;
}

.ss-field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ss-text-muted);
}

.ss-field input[type="number"],
.ss-field input[type="date"],
.ss-field input[type="time"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 2px solid var(--ss-border);
  border-radius: 8px;
  outline: none;
  color: var(--ss-text);
  background: var(--ss-bg);
  font-family: inherit;
  transition: border-color 0.15s ease;
  color-scheme: dark;
}

.ss-field input:focus {
  border-color: var(--ss-accent);
}

.ss-input-with-unit {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ss-input-with-unit input {
  flex: 1;
  width: 100%;
}

.ss-unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ss-text-muted);
  white-space: nowrap;
}

.ss-radio-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.ss-radio {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border: 2px solid var(--ss-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--ss-text);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.ss-radio:has(input:checked) {
  border-color: var(--ss-accent);
  background: rgba(251, 146, 60, 0.12);
  color: var(--ss-accent);
  font-weight: 600;
}

.ss-radio input {
  accent-color: var(--ss-accent);
}

.ss-btn {
  padding: 10px 14px;
  border: 2px solid var(--ss-border);
  border-radius: 8px;
  background: var(--ss-bg);
  color: var(--ss-text);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.ss-btn:hover {
  border-color: var(--ss-accent);
  color: var(--ss-accent);
}

.ss-preset-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.ss-preset-btn {
  flex: 1;
  min-width: 80px;
  padding: 9px 10px;
  border: 1px solid var(--ss-border);
  border-radius: 999px;
  background: transparent;
  color: var(--ss-text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.ss-preset-btn:hover {
  border-color: var(--ss-accent);
  color: var(--ss-accent);
  background: rgba(251, 146, 60, 0.1);
}

.ss-time-slider-field {
  margin-top: 16px;
}

.ss-time-slider-field input[type="range"] {
  width: 100%;
  accent-color: var(--ss-accent);
  cursor: pointer;
}

.ss-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--ss-text);
  cursor: pointer;
}

.ss-checkbox + .ss-checkbox {
  margin-top: 10px;
}

.ss-checkbox input {
  accent-color: var(--ss-accent);
  width: 16px;
  height: 16px;
}

.ss-error {
  margin: 10px 0 0;
  padding: 10px 14px;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.4);
  border-radius: 8px;
  color: #f87171;
  font-size: 0.85rem;
}

.ss-error[hidden] {
  display: none;
}

.ss-canvas-wrap {
  position: relative;
  border-radius: var(--ss-radius);
  overflow: hidden;
  border: 1px solid var(--ss-border);
  background: #1a2338;
}

.ss-canvas-container {
  width: 100%;
  height: 60vh;
  min-height: 360px;
  max-height: 640px;
}

.ss-canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  touch-action: none;
}

.ss-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  color: var(--ss-text-muted);
  font-size: 0.9rem;
}

.ss-fallback[hidden] {
  display: none;
}

.ss-sun-info {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 12px 16px;
  background: var(--ss-card-bg);
  border: 1px solid var(--ss-border);
  border-radius: var(--ss-radius);
  font-size: 0.85rem;
  color: var(--ss-text-muted);
}

.ss-sun-info-item strong {
  color: var(--ss-text);
  font-weight: 700;
}

.ss-sun-info-night {
  color: var(--ss-accent);
  font-weight: 700;
}

.ss-sun-info-night[hidden] {
  display: none;
}

.ss-disclaimer {
  max-width: 680px;
  margin: 20px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--ss-border);
  font-size: 0.78rem;
  color: var(--ss-text-muted);
}

.ads-container {
  margin: 40px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ss-card-bg);
  border: 1px solid var(--ss-border);
  border-radius: var(--ss-radius);
  color: var(--ss-text-muted);
  font-size: 0.85rem;
}

.ads-rail {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 160px;
  margin: 0;
  display: none;
  z-index: 5;
}

.ads-rail-left {
  left: 16px;
}

.ads-rail-right {
  right: 16px;
}

@media (min-width: 1352px) {
  .ads-rail {
    display: flex;
  }
}

.info-section {
  max-width: 680px;
  margin: 24px auto 0;
}

.info-section h2 {
  color: var(--ss-accent);
  font-size: 1.35rem;
  margin-top: 32px;
}

.faq-list .faq-item {
  margin-bottom: 16px;
}

.faq-list dt {
  font-weight: 600;
  color: var(--ss-text);
  margin-bottom: 4px;
}

.faq-list dd {
  margin: 0;
  color: var(--ss-text-muted);
}

.footer-links {
  margin: 8px 0 0;
}

.footer-links a {
  color: var(--ss-text-muted);
  text-decoration: underline;
}

.footer-links a:hover {
  color: var(--ss-accent);
}

.page-footer {
  text-align: center;
  padding: 24px 16px 40px;
  color: var(--ss-text-muted);
  font-size: 0.85rem;
}

.scroll-top-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--ss-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(251, 146, 60, 0.3);
  transition: background 0.12s ease, transform 0.12s ease;
}

.scroll-top-btn:hover {
  background: var(--ss-accent-dark);
  transform: translateY(-2px);
}

.scroll-top-btn[hidden] {
  display: none;
}

@media (max-width: 480px) {
  .page-header h1 {
    font-size: 1.7rem;
  }

  .ss-preset-btn {
    min-width: 70px;
  }
}