/* ============================================
   SBTI — 滑雪人格测试
   冬日雪山 · 清冷通透 · 暖橙点缀
   ============================================ */

:root {
  --bg: #f2f5f9;
  --bg-card: #ffffff;
  --snow-soft: #e8edf4;
  --snow-mid: #c8d4e2;
  --accent: #4a7fb5;
  --accent-deep: #2c5a8a;
  --warm: #e07c4a;
  --text-1: #1e2a3a;
  --text-2: #4a5d72;
  --text-3: #8a9bb0;
  --card-shadow: 0 1px 12px rgba(30, 42, 58, 0.05);
  --border: rgba(30, 42, 58, 0.06);
  --r: 18px;
  --r-sm: 12px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { height: 100%; overflow: hidden; }

body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text-1);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* ============ Snow Canvas ============ */
#snow-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============ Screen System ============ */
.screen {
  position: fixed;
  inset: 0;
  z-index: 1;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

.screen.active { opacity: 1; visibility: visible; }

/* ============ Landing ============ */
#screen-landing {
  display: flex;
  align-items: center;
  justify-content: center;
}

.landing-content {
  text-align: center;
  padding: 32px 24px 100px;
  max-width: 420px;
  animation: fadeInUp 0.8s ease;
}

.logo-area { margin-bottom: 20px; }

.hero-image {
  width: 110px;
  height: 110px;
  margin: 0 auto 18px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(74, 127, 181, 0.15), 0 0 0 3px rgba(74, 127, 181, 0.08);
  animation: float 5s ease-in-out infinite;
  position: relative;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 20px rgba(255,255,255,0.4);
  pointer-events: none;
}

.hero-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

.title-main {
  display: block;
  font-size: 50px;
  font-weight: 800;
  letter-spacing: 6px;
  background: linear-gradient(135deg, var(--accent-deep) 0%, var(--accent) 60%, var(--warm) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.title-sub {
  display: block;
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-3);
  margin-top: 6px;
  text-transform: uppercase;
  font-weight: 500;
}

.tagline {
  font-size: 17px;
  color: var(--text-1);
  margin-bottom: 6px;
  font-weight: 500;
}

.desc {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 28px;
  letter-spacing: 0.3px;
}

/* Mode Select */
.mode-select {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 24px;
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 20px 32px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.3s var(--ease);
  box-shadow: var(--card-shadow);
  min-width: 110px;
}

.mode-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(74, 127, 181, 0.12);
  transform: translateY(-3px);
}

.mode-btn:active { transform: translateY(-1px); }

.mode-emoji { font-size: 36px; }
.mode-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
}

.disclaimer {
  font-size: 12px;
  color: var(--text-3);
}

.mountain-bottom {
  position: fixed;
  bottom: 0; left: 0;
  width: 100%;
  z-index: 0;
  pointer-events: none;
}

.mountain-bottom svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* ============ Quiz ============ */
#screen-quiz {
  display: flex;
  flex-direction: column;
}

.quiz-header {
  flex-shrink: 0;
  padding: 16px 20px 10px;
  background: linear-gradient(180deg, var(--bg) 70%, transparent);
  z-index: 5;
}

.progress-bar {
  height: 3px;
  background: var(--snow-soft);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  border-radius: 2px;
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-text {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-3);
}

.depth-indicator {
  font-size: 11px;
  padding: 2px 10px;
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}

.quiz-body {
  flex: 1;
  overflow-y: auto;
  padding: 4px 20px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 18px;
  margin-bottom: 12px;
  box-shadow: var(--card-shadow);
  width: 100%;
  max-width: 500px;
}

.question-text {
  font-size: 16px;
  line-height: 1.65;
  font-weight: 500;
  color: var(--text-1);
}

.options-container {
  display: flex;
  flex-direction: column;
  gap: 9px;
  width: 100%;
  max-width: 500px;
}

.option-btn {
  display: block;
  width: 100%;
  padding: 13px 16px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.45;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.option-btn:hover {
  background: var(--snow-soft);
  border-color: rgba(74,127,181,0.18);
  color: var(--text-1);
  box-shadow: var(--card-shadow);
}

.option-btn:active { transform: scale(0.98); }

.option-btn.selected {
  background: rgba(74,127,181,0.06);
  border-color: var(--accent);
  color: var(--text-1);
}

.question-card.slide-out { animation: slideOut 0.25s ease forwards; }
.question-card.slide-in { animation: slideIn 0.25s ease forwards; }
.options-container.fade-out { animation: fadeOut 0.15s ease forwards; }

/* ============ Calculating ============ */
#screen-calculating {
  display: flex;
  align-items: center;
  justify-content: center;
}

.calc-content { text-align: center; padding: 40px 24px; }
.calc-anim { margin-bottom: 28px; }

.calc-circle {
  width: 100px; height: 100px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calc-ring {
  position: absolute;
  inset: 0;
  border: 2px solid var(--snow-soft);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1.2s linear infinite;
}

.calc-emoji { font-size: 40px; animation: float 2s ease-in-out infinite; }

.calc-text {
  font-size: 15px;
  color: var(--text-2);
  margin-bottom: 12px;
}

.calc-depth {
  font-size: 42px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.depth-unit {
  font-size: 20px;
  font-weight: 600;
  opacity: 0.6;
}

/* ============ Result ============ */
#screen-result { display: block; }

.result-content {
  max-width: 500px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.result-header {
  text-align: center;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease;
}

.result-type-badge {
  display: inline-block;
  padding: 4px 14px;
  background: var(--snow-soft);
  border-radius: 20px;
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 2px;
  margin-bottom: 14px;
  font-weight: 500;
}

.result-emoji { font-size: 52px; display: block; margin-bottom: 10px; animation: float 3.5s ease-in-out infinite; }
.result-code { font-size: 44px; font-weight: 800; letter-spacing: 5px; margin-bottom: 4px; line-height: 1.1; }
.result-name { font-size: 20px; font-weight: 600; margin-bottom: 8px; color: var(--text-1); }
.result-tagline { font-size: 14px; color: var(--text-3); font-style: italic; }

.result-dimensions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
  animation: fadeInUp 0.6s ease 0.15s both;
}

.dim-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 12px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.dim-label { font-size: 10px; color: var(--text-3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; font-weight: 500; }
.dim-value { font-size: 15px; font-weight: 700; }
.dim-bar { height: 3px; background: var(--snow-soft); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.dim-bar-fill { height: 100%; border-radius: 2px; transition: width 0.8s ease 0.4s; }

.result-description { animation: fadeInUp 0.6s ease 0.25s both; }

.result-desc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px;
  margin-bottom: 14px;
  box-shadow: var(--card-shadow);
}

.result-desc-card p { font-size: 14px; line-height: 1.8; color: var(--text-2); }
.result-desc-card p + p { margin-top: 12px; }

.result-actions {
  display: flex; flex-direction: column; gap: 9px; margin-top: 20px;
  animation: fadeInUp 0.6s ease 0.35s both;
}

.btn-share {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px;
  background: linear-gradient(135deg, var(--accent), var(--warm));
  color: white; border: none; border-radius: var(--r-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: all 0.3s var(--ease);
  box-shadow: 0 3px 12px rgba(74,127,181,0.18);
}

.btn-share:hover { transform: translateY(-1px); box-shadow: 0 5px 18px rgba(74,127,181,0.24); }

.btn-secondary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px;
  background: var(--bg-card); color: var(--text-2);
  border: 1.5px solid var(--border); border-radius: var(--r-sm);
  font-size: 14px; cursor: pointer;
  transition: all 0.3s var(--ease);
}

.btn-secondary:hover { background: var(--snow-soft); color: var(--text-1); }

.result-footer {
  text-align: center; margin-top: 28px; padding-top: 16px;
  border-top: 1px solid var(--border);
}

.result-footer p { font-size: 11px; color: var(--text-3); }
.result-footer p + p { margin-top: 3px; }

/* Toast */
.toast {
  position: fixed; bottom: 36px; left: 50%;
  transform: translateX(-50%) translateY(16px);
  padding: 11px 22px;
  background: var(--text-1); color: white;
  border-radius: 10px; font-size: 13px; font-weight: 500;
  opacity: 0; transition: all 0.3s ease;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ Animations ============ */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes slideOut {
  to { opacity: 0; transform: translateX(-24px); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(24px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes bobDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(3px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============ Responsive ============ */

@media (max-width: 600px) {
  .quiz-header { padding: 12px 16px 8px; }
  .quiz-body { padding: 2px 16px 16px; justify-content: flex-start; }
  .question-card { padding: 16px 16px; margin-bottom: 10px; border-radius: 14px; }
  .question-text { font-size: 15px; line-height: 1.6; }
  .options-container { gap: 7px; }
  .option-btn { padding: 11px 14px; font-size: 13.5px; line-height: 1.4; border-radius: 10px; }
  .progress-text { font-size: 12px; margin-top: 4px; }
  .depth-indicator { font-size: 10px; padding: 2px 8px; }
  .landing-content { padding: 24px 20px 80px; }
  .hero-image { width: 90px; height: 90px; }
  .title-main { font-size: 42px; letter-spacing: 4px; }
  .tagline { font-size: 15px; }
  .desc { font-size: 12px; margin-bottom: 20px; }
  .mode-btn { padding: 16px 26px; min-width: 100px; }
  .mode-emoji { font-size: 30px; }
  .mode-label { font-size: 14px; }
  .disclaimer { font-size: 11px; }
}

@media (max-width: 380px) {
  .title-main { font-size: 36px; }
  .question-text { font-size: 14px; }
  .option-btn { font-size: 12.5px; padding: 10px 12px; }
  .hero-image { width: 80px; height: 80px; }
  .mode-btn { padding: 14px 22px; }
}

@media (max-height: 700px) and (max-width: 600px) {
  .question-card { padding: 14px 14px; margin-bottom: 8px; }
  .question-text { font-size: 14px; }
  .option-btn { padding: 9px 12px; font-size: 12.5px; }
  .options-container { gap: 5px; }
  .quiz-header { padding: 10px 16px 6px; }
}

@media (min-width: 768px) {
  .title-main { font-size: 64px; }
  .tagline { font-size: 19px; }
  .hero-image { width: 130px; height: 130px; }
  .mode-btn { padding: 24px 40px; }
  .mode-emoji { font-size: 42px; }
}

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.06); border-radius: 2px; }

::selection { background: rgba(74,127,181,0.12); }