:root {
  --primary-color: #1e40af;
  --secondary-color: #f8fafc;
  --accent-color: #2563eb;
  --text-color: #0f172a;
  --text-light: #475569;
  --background-color: #f1f5f9;
  --button-hover: #1d4ed8;
  --operator-color: #3b82f6;
  --display-bg: #ffffff;
  --border-color: #cbd5e1;
  --number-bg: #f1f5f9;
  --number-text: #334155;
  --shadow-light: rgba(15, 23, 42, 0.08);
  --shadow-medium: rgba(15, 23, 42, 0.12);
  --background-gradient-start: #dce3eb;
  --background-gradient-end: #cedae9;
}

/* Modo Escuro */
[data-theme="dark"] {
  --primary-color: #1c51a6;
  --secondary-color: #374151;
  --accent-color: #4d85c9;
  --text-color: #f8fafc;
  --text-light: #cbd5e1;
  --background-color: #0f172a;
  --button-hover: #2563eb;
  --operator-color: #60a5fa;
  --display-bg: #1e293b;
  --border-color: #475569;
  --number-bg: #4b5563;
  --number-text: #e2e8f0;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.4);
  --background-gradient-start: #0f172a;
  --background-gradient-end: #1e293b;
}

.material-symbols-outlined {
  font-variation-settings:
  'FILL' 0,
  'wght' 400,
  'GRAD' 0,
  'opsz' 24
}


* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  width: 100dvw;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, var(--background-gradient-start) 0%, var(--background-gradient-end) 100%);
  justify-content: center;
  align-items: center;
  font-weight: 400;
  transition: background 0.3s ease;
}

header {
  width: 100%;
  height: 10dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: transparent;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.5px;
  position: relative;
  transition: color 0.3s ease;
}

#theme-toggle {
  position: absolute;
  right: 20px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background: var(--display-bg);
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px var(--shadow-light);
  border: 2px solid var(--border-color);

  &:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px var(--shadow-medium);
  }

  &:active {
    transform: scale(0.95);
  }
}

#theme-icon {
  transition: transform 0.3s ease;
}

#theme-toggle:hover #theme-icon {
  transform: rotate(20deg);
}

main {
  width: 100%;
  height: 90dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#calculadora {
  width: 380px;
  height: 580px;
  min-height: 580px;
  max-height: 580px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  background: var(--display-bg);
  padding: 24px;
  box-shadow: 0 20px 25px -5px var(--shadow-light),
    0 10px 10px -5px var(--shadow-medium);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: all 0.3s ease;
}

#tela {
  width: 100%;
  height: 35%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-end;
  background: var(--secondary-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: inset 0 2px 4px 0 var(--shadow-light);
  overflow: hidden;
  gap: 0px;
  transition: all 0.3s ease;
}

#tela input {
  width: 100%;
  height: 45px;
  min-height: 45px;
  max-height: 45px;
  border: none;
  border-radius: 8px;
  padding: 8px 0;
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--text-light);
  background-color: transparent;
  outline: none;
  text-align: right;
  flex-shrink: 0;
  margin-bottom: 4px;
  transition: color 0.3s ease, background-color 0.3s ease;

  &:focus {
    border: none;
  }
  &::placeholder {
    color: var(--text-light);
    opacity: 0.6;
  }
}

#tela p {
  width: 100%;
  height: 55px;
  min-height: 55px;
  max-height: 55px;
  border: none;
  padding: 4px 0;
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--text-color);
  background-color: transparent;
  outline: none;
  text-align: right;
  margin-bottom: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  transition: color 0.3s ease;
}

div#botoes {
  width: 100%;
  height: 65%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(5, 1fr);
  gap: 12px;
  justify-content: center;
  align-items: center;
}

div#botoes button {
  width: 100%;
  height: 60px;
  border: none;
  border-radius: 16px;
  background: var(--number-bg);
  color: var(--number-text);
  font-size: 1.4rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.3s ease, color 0.3s ease;
  box-shadow: 0 1px 3px 0 var(--shadow-light), 0 1px 2px 0 var(--shadow-medium);

  &:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px var(--shadow-light),
      0 2px 4px -1px var(--shadow-medium);
  }

  &:active {
    transform: translateY(0);
  }
}

/* Botões de operação com estilo diferenciado */
div#botoes button[onclick*="definirOperacao"] {
  background: var(--accent-color);
  color: white;
  font-weight: 600;

  &:hover {
    background: var(--button-hover);
  }
}

/* Botão de igual com destaque */
div#botoes button[onclick*="calcularResultado"] {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  font-size: 1.6rem;
  grid-column: span 2;

  &:hover {
    background: var(--button-hover);
  }
}

/* Botão Limpar com cor diferenciada */
div#botoes button[onclick*="limparTudo"] {
  background: #dc2626;
  color: white;
  font-weight: 600;

  &:hover {
    background: #b91c1c;
  }
}

button#btn-apagarUltimo {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 10px;
  background: var(--accent-color);
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.3s ease, color 0.3s ease;
  box-shadow: 0 2px 4px 0 var(--shadow-light);

  &:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px var(--shadow-light),
      0 2px 4px -1px var(--shadow-medium);
  }

  &:active {
    transform: translateY(0);
  }
}