:root {
  --bg-main: #000000;
  --accent: #ffd700; /* amarelo ouro */
  --accent-soft: rgba(255, 215, 0, 0.3);
  --accent-strong: rgba(255, 215, 0, 0.9);
  --text-main: #ffd700;
  --danger: #ff4d4d;
  --font-main: "Orbitron", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-main);
  display: flex;
  justify-content: center;
  align-items: stretch;
}

/* CONTÊINER GERAL */

.app-container {
  min-height: 100vh;
  width: 100%;
  max-width: 1200px;
  padding: 0 1rem 1.5rem;
  display: flex;
  flex-direction: column;
}

/* CABEÇALHO / LOGO */

.app-header {
  padding: 1.25rem 0 0.75rem;
  text-align: center;
}

.logo-text {
  margin: 0;
  font-size: clamp(1.3rem, 2.3vw, 1.8rem);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-soft), 0 0 20px var(--accent-strong);
}

/* LAYOUT PRINCIPAL */

.app-main {
  flex: 1;
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

/* SIDEBAR */

.sidebar {
  min-width: 210px;
  max-width: 220px;
  background: radial-gradient(circle at top left, #111111 0%, #000000 60%, #000000 100%);
  border-radius: 18px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  border: 1px solid rgba(255, 215, 0, 0.25);
  box-shadow: 0 0 18px rgba(255, 215, 0, 0.2);
}

.tab-button {
  width: 100%;
  padding: 0.7rem 0.5rem;
  background: transparent;
  border-radius: 999px;
  border: 1px solid var(--accent-soft);
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  cursor: pointer;
  transition:
    background-color 0.18s ease-out,
    color 0.18s ease-out,
    box-shadow 0.18s ease-out,
    transform 0.08s ease-out,
    border-color 0.18s ease-out;
}

.tab-button:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-soft);
  transform: translateY(-1px);
}

.tab-button.active {
  background-color: var(--accent);
  color: #000000;
  box-shadow: 0 0 18px var(--accent-soft);
  border-color: transparent;
}

/* ÁREA DE TELAS */

.screen-container {
  flex: 1;
  background: radial-gradient(circle at top, #111111 0%, #000000 55%, #000000 100%);
  border-radius: 24px;
  border: 1px solid rgba(255, 215, 0, 0.25);
  box-shadow: 0 0 25px rgba(255, 215, 0, 0.35);
  padding: 1rem 1.5rem;
  overflow: hidden;
  display: flex;
}

.screen {
  display: none;
  width: 100%;
}

.screen.active {
  display: flex;
}

.screen-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 1rem;
}

.center-content {
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* RELÓGIO PRINCIPAL */

.clock-time {
  font-size: clamp(3rem, 9vw, 6rem);
  text-align: center;
  letter-spacing: 0.2em;
  font-weight: 700;
  text-shadow: 0 0 12px var(--accent-soft), 0 0 26px var(--accent-strong);
  width: 10ch; /* fixa a largura pra não "pular" ao trocar os números */
  font-variant-numeric: tabular-nums;
  margin: 0 auto;
}

.clock-date {
  margin-top: 0.75rem;
  font-size: clamp(0.8rem, 2vw, 1rem);
  opacity: 0.85;
  text-transform: capitalize;
}

/* TÍTULOS DE TELAS */

.screen-title {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* DISPLAY GRANDE (cronômetro, timer) */

.big-display {
  font-size: clamp(2.3rem, 6vw, 3.2rem);
  text-align: center;
  letter-spacing: 0.18em;
  font-weight: 700;
  padding: 0.75rem 1rem;
  border-radius: 18px;
  background: radial-gradient(circle at top, #111111 0%, #050505 60%, #000000 100%);
  border: 1px solid rgba(255, 215, 0, 0.35);
  text-shadow: 0 0 10px var(--accent-soft), 0 0 22px var(--accent-strong);
  font-variant-numeric: tabular-nums;
}

/* CONTROLES / BOTÕES */

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.primary-btn,
.secondary-btn {
  flex: 1;
  min-width: 120px;
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--accent-soft);
  background: transparent;
  color: var(--text-main);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background-color 0.18s ease-out,
    color 0.18s ease-out,
    box-shadow 0.18s ease-out,
    transform 0.08s ease-out,
    border-color 0.18s ease-out;
}

.primary-btn {
  border-color: var(--accent);
}

.primary-btn:hover {
  background-color: var(--accent);
  color: #000000;
  box-shadow: 0 0 16px var(--accent-soft);
  transform: translateY(-1px);
}

.secondary-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-soft);
}

/* TIMER */

.timer-inputs {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.timer-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.timer-field label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.timer-field input {
  width: 80px;
  padding: 0.35rem 0.4rem;
  border-radius: 10px;
  border: 1px solid var(--accent-soft);
  background-color: rgba(10, 10, 10, 0.9);
  color: var(--text-main);
  font-size: 0.9rem;
  font-family: var(--font-main);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.timer-field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-soft);
}

/* SELECTS */

.select-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.4rem;
  flex-wrap: wrap;
}

.select-row label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.select-row select {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--accent-soft);
  background-color: rgba(10, 10, 10, 0.9);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.8rem;
}

.select-row select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-soft);
}

/* DESPERTADOR */

.alarm-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.4rem 0;
  flex-wrap: wrap;
}

.alarm-row label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.alarm-row input[type="time"] {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--accent-soft);
  background-color: rgba(10, 10, 10, 0.9);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.85rem;
}

/* STATUS TEXTOS */

.status-text {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  opacity: 0.85;
}

/* ALERTA VISUAL DO ALARME */

.alarm-active .big-display,
.alarm-active .clock-time {
  animation: pulse-glow 0.9s infinite alternate;
}

@keyframes pulse-glow {
  from {
    box-shadow: 0 0 12px var(--accent-soft), 0 0 22px var(--accent-soft);
    text-shadow: 0 0 10px var(--accent-soft), 0 0 24px var(--accent-strong);
  }
  to {
    box-shadow: 0 0 24px var(--accent-strong), 0 0 40px var(--accent-strong);
    text-shadow: 0 0 18px var(--accent-strong), 0 0 36px var(--accent-strong);
  }
}

/* ========================= */
/*      RESPONSIVIDADE       */
/* ========================= */

/* Tablets e celulares em modo paisagem */
@media (max-width: 900px) {
  .app-main {
    flex-direction: column;
    gap: 0.6rem;
  }

  /* Sidebar horizontal */
  .sidebar {
    flex-direction: row;
    min-width: 100%;
    max-width: 100%;
    justify-content: space-between;
    padding: 0.5rem;
    border-radius: 14px;
  }

  .tab-button {
    flex: 1;
    text-align: center;
    padding: 0.5rem 0.3rem;
    font-size: 0.75rem;
  }

  .screen-container {
    padding: 0.7rem;
    border-radius: 18px;
    min-height: 360px;
  }

  .clock-time {
    font-size: 3.2rem;
    letter-spacing: 0.16em;
  }

  .clock-date {
    font-size: 0.9rem;
  }

  .controls-row {
    justify-content: space-between;
  }
}

/* Celulares menores (modo retrato) */
@media (max-width: 600px) {
  .app-container {
    padding: 0 0.6rem 1rem;
  }

  .logo-text {
    letter-spacing: 0.18em;
    font-size: 1.1rem;
  }

  .sidebar {
    gap: 0.3rem;
    padding: 0.45rem;
  }

  .tab-button {
    font-size: 0.68rem;
    padding: 0.4rem 0.2rem;
  }

  .screen-container {
    padding: 0.5rem;
    border-radius: 14px;
    min-height: 320px;
  }

  .clock-time {
    font-size: 2.7rem;
    letter-spacing: 0.14em;
  }

  .clock-date {
    font-size: 0.85rem;
  }

  .big-display {
    font-size: 2rem;
    padding: 0.6rem 0.7rem;
  }

  .timer-inputs {
    gap: 0.6rem;
  }

  .timer-field input {
    width: 70px;
  }

  .primary-btn,
  .secondary-btn {
    min-width: 100px;
    font-size: 0.7rem;
  }
}