/* ============================================
   MNA 代谢年龄检测 H5 平台 - 主题变量
   ============================================ */

:root {
  /* Primary Colors */
  --color-primary: #2D9C5E;
  --color-primary-light: #4DB87A;
  --color-primary-dark: #1E7A48;
  --color-primary-bg: #E8F5EE;

  /* Secondary Colors */
  --color-secondary: #FF8C42;
  --color-secondary-light: #FFA66B;
  --color-secondary-bg: #FFF3EB;

  /* Neutral Colors */
  --color-bg: #F7F8FA;
  --color-surface: #FFFFFF;
  --color-border: #E8E8E8;
  --color-divider: #F0F0F0;

  /* Text Colors */
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-text-inverse: #FFFFFF;

  /* Semantic Colors */
  --color-success: #2D9C5E;
  --color-warning: #FFB020;
  --color-error: #E54D4D;
  --color-info: #3B82F6;

  /* Spacing Scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-primary: 0 4px 16px rgba(45,156,94,0.24);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 600;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Layout */
  --header-height: 56px;
  --bottom-bar-height: 72px;
  --max-content-width: 480px;
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);

  /* Z-index Scale */
  --z-base: 1;
  --z-sticky: 100;
  --z-header: 200;
  --z-modal: 300;
  --z-toast: 400;
  --z-overlay: 500;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior-y: none;
}

#app {
  max-width: var(--max-content-width);
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  background-color: var(--color-surface);
  position: relative;
}

/* ============================================
   Responsive Breakpoints
   ============================================ */
@media (min-width: 360px) {
  :root {
    --font-size-md: 16px;
  }
}

@media (min-width: 414px) {
  :root {
    --font-size-lg: 20px;
    --font-size-xl: 22px;
  }
}

@media (min-width: 480px) {
  #app {
    box-shadow: var(--shadow-lg);
  }
}

/* ============================================
   Animation Keyframes
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

@keyframes slideOutRight {
  from { transform: translateX(0); }
  to { transform: translateX(100%); }
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes toastSlideUp {
  from { transform: translate(-50%, 100%); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

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

/* ============================================
   Utility Classes
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-medium { font-weight: var(--font-weight-medium); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-error { color: var(--color-error); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }

.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }

.bg-surface { background-color: var(--color-surface); }
.bg-primary { background-color: var(--color-primary); }
.bg-primary-bg { background-color: var(--color-primary-bg); }

/* Touch optimization */
.touch-manipulation {
  touch-action: manipulation;
  -webkit-touch-callout: none;
  user-select: none;
}

/* iOS safe area helpers */
.safe-bottom {
  padding-bottom: calc(var(--space-md) + var(--safe-area-bottom));
}

.safe-top {
  padding-top: calc(var(--space-md) + var(--safe-area-top));
}