:root {
  /* ==========================================================================
     Samsung One UI Design Tokens — Otimizado para Mobile & Telas AMOLED
     Dimensões Proporcionais para Telas de 360px a 430px (Galaxy J7 Neo, M35, S-Series)
     ========================================================================== */

  /* Cores de Superfície - AMOLED Dark Puro */
  --bg-app: #000000;
  --bg-surface: #101115;
  --bg-surface-elevated: #181920;
  --bg-card: #14151a;
  --bg-card-hover: #1b1d24;
  --bg-card-nested: #1e2028;

  /* Bordas One UI (Hairline Sutis) */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-focus: #2d74ff;
  --border-active: rgba(45, 116, 255, 0.35);

  /* Tipografia One UI */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Samsung Sans", "One UI Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Cores de Texto (WCAG AA Alto Contraste) */
  --text-main: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #9499a8;
  --text-dim: #646977;

  /* Cores Semânticas / Samsung One UI Accents */
  --color-primary: #2d74ff;        /* Samsung One UI Signature Blue */
  --color-primary-hover: #1b64f2;
  --color-primary-subtle: rgba(45, 116, 255, 0.14);
  --color-primary-glow: rgba(45, 116, 255, 0.35);

  --color-success: #1cd166;        /* Samsung Emerald Green (Saudável/Carregando) */
  --color-success-subtle: rgba(28, 209, 102, 0.14);
  
  --color-warning: #fca130;        /* Samsung Warm Amber (Descarregando/Atenção) */
  --color-warning-subtle: rgba(252, 161, 48, 0.14);
  
  --color-danger: #ff4757;         /* Samsung Coral Red (Crítico/Erro) */
  --color-danger-subtle: rgba(255, 71, 87, 0.14);
  
  --color-info: #00b4d8;           /* Samsung Teal (Câmeras/Rede) */
  --color-info-subtle: rgba(0, 180, 216, 0.14);

  --color-flash: #ffd166;          /* Flash LED Warm Gold */
  --color-flash-glow: rgba(255, 209, 102, 0.35);

  /* Dimensões Proporcionais para Mobile */
  --topbar-height: 54px;
  --sidebar-width: 240px;
  --bottom-nav-height: 60px;

  /* Raios de Borda Proporcionais */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-pill: 9999px;

  /* Transições One UI Spring-Like */
  --transition-fast: 140ms cubic-bezier(0.2, 0.8, 0.4, 1);
  --transition-normal: 240ms cubic-bezier(0.2, 0.8, 0.4, 1);
}