/* ========================================
   Christmas Hat Generator - Modern UI
   ======================================== */

/* CSS Variables - Christmas Theme */
:root {
  --color-bg: #0a0f1a;
  --color-surface: rgba(20, 30, 50, 0.85);
  --color-glass: rgba(255, 255, 255, 0.08);
  --color-glass-border: rgba(255, 255, 255, 0.12);

  --color-primary: #e74c3c;
  --color-primary-glow: rgba(231, 76, 60, 0.4);
  --color-secondary: #27ae60;
  --color-accent: #f1c40f;
  --color-white: #ffffff;
  --color-text: rgba(255, 255, 255, 0.9);
  --color-text-muted: rgba(255, 255, 255, 0.6);

  /* 帽子位置配置 */
  --hat-offset-x: 0;
  --hat-offset-y: 0;
  --hat-scale: 1.5;

  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px var(--color-primary-glow);

  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

/* ========================================
   Loading Screen
   ======================================== */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0f1a 0%, #1a1f2e 50%, #0a0f1a 100%);
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-content {
  text-align: center;
  z-index: 2;
}

.loading-icon {
  font-size: 80px;
  animation: bounce 1s ease-in-out infinite;
  filter: drop-shadow(0 10px 30px rgba(231, 76, 60, 0.3));
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-15px);
  }
}

.loading-title {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.loading-text {
  margin-top: 12px;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  margin: 24px auto;
  border: 3px solid var(--color-glass);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-hint {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Snowflakes Animation */
.snowflakes {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.snowflake {
  position: absolute;
  top: -20px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.5rem;
  animation: fall linear infinite;
}

.snowflake:nth-child(1) {
  left: 10%;
  animation-duration: 10s;
  animation-delay: 0s;
}

.snowflake:nth-child(2) {
  left: 25%;
  animation-duration: 12s;
  animation-delay: 2s;
  font-size: 1rem;
}

.snowflake:nth-child(3) {
  left: 40%;
  animation-duration: 8s;
  animation-delay: 4s;
}

.snowflake:nth-child(4) {
  left: 55%;
  animation-duration: 14s;
  animation-delay: 1s;
  font-size: 2rem;
}

.snowflake:nth-child(5) {
  left: 70%;
  animation-duration: 9s;
  animation-delay: 3s;
}

.snowflake:nth-child(6) {
  left: 85%;
  animation-duration: 11s;
  animation-delay: 5s;
  font-size: 1rem;
}

.snowflake:nth-child(7) {
  left: 5%;
  animation-duration: 13s;
  animation-delay: 6s;
}

.snowflake:nth-child(8) {
  left: 95%;
  animation-duration: 10s;
  animation-delay: 7s;
  font-size: 1.2rem;
}

@keyframes fall {
  0% {
    transform: translateY(-20px) rotate(0deg);
    opacity: 1;
  }

  100% {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0.3;
  }
}

/* ========================================
   Main App Container
   ======================================== */
.app-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--color-bg);
}

#video {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

#overlay,
#snow {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* ========================================
   Header
   ======================================== */
.header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 16px 24px;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent);
  z-index: 10;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.icon-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-glass-border);
  border-radius: 50%;
  color: var(--color-white);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--color-primary);
  transform: scale(1.1);
}

/* ========================================
   Hat Selector
   ======================================== */
.hat-selector {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 20px;
  z-index: 10;
}

.nav-btn {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: 50%;
  color: var(--color-white);
  font-size: 1.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.nav-btn:hover {
  background: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: scale(1.1);
}

.nav-btn:active {
  transform: scale(0.95);
}

.arrow {
  line-height: 1;
  margin-top: -4px;
}

.hat-preview-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hat-preview {
  width: 80px;
  height: 80px;
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 2px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.hat-preview:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.hat-preview img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.hat-counter {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ========================================
   Status Bar
   ======================================== */
.status-bar {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 16px;
  padding: 12px 20px;
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  z-index: 10;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-icon {
  font-size: 1rem;
}

.status-text {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ========================================
   Modal (Help)
   ======================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 400px;
  background: linear-gradient(145deg, rgba(30, 40, 60, 0.95), rgba(20, 30, 45, 0.98));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  animation: modalIn var(--transition-normal) ease-out;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }

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

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-primary);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  text-align: center;
}

.help-section {
  margin-bottom: 20px;
}

.help-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-accent);
}

.help-section p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.btn-primary {
  width: 100%;
  padding: 14px 24px;
  margin-top: 24px;
  background: linear-gradient(135deg, var(--color-primary), #c0392b);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 600px) {
  .logo {
    font-size: 1.2rem;
  }

  .hat-selector {
    bottom: 80px;
    gap: 12px;
  }

  .nav-btn {
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
  }

  .hat-preview {
    width: 64px;
    height: 64px;
  }

  .status-bar {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 16px;
    padding: 10px 16px;
  }

  .status-text {
    font-size: 0.75rem;
  }
}

/* ========================================
   Hat Position Control Panel
   ======================================== */
.position-panel {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  z-index: 10;
  text-align: center;
}

.position-panel h4 {
  font-size: 0.9rem;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.position-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.pos-row {
  display: flex;
  gap: 4px;
}

.position-controls button {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.position-controls button:hover {
  background: var(--color-primary);
  transform: scale(1.1);
}

.position-controls button:active {
  transform: scale(0.95);
}

.position-controls button#pos-reset {
  font-size: 1rem;
}

.position-offset {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .position-panel {
    right: 10px;
    padding: 12px;
  }

  .position-controls button {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }
}