@import url(https://fonts.googleapis.com/css?family=Poppins:100,100italic,200,200italic,300,300italic,regular,italic,500,500italic,600,600italic,700,700italic,800,800italic,900,900italic);

:root {
  --primary: #10b981;
  --bg: #0a0f1a;
  --bg-card: #111827;
  --bg-border: #1f2937;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --error: #ef4444;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
  /* background-color: var(--bg); */
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  background-color: var(--bg);
  border-radius: 20px;
  padding: 40px;
  max-width: 700px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(10, 15, 26, 0.9);
  border: 1px solid var(--bg-border);
}

header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #f9fafb;
}

header p {
  color: var(--text-muted);
  font-size: 1rem;
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}

.input-section label {
  font-weight: 500;
  color: var(--text);
}

.input-section input {
  padding: 12px 16px;
  font-size: 1rem;
  font-family: "Poppins", sans-serif;
  border: 2px solid #374151;
  border-radius: 10px;
  transition: border-color 0.2s, background-color 0.2s;
  background-color: var(--bg-card);
  color: var(--text);
}

.input-section input::placeholder {
  color: #6b7280;
}

.input-section input::-webkit-calendar-picker-indicator {
  filter: invert(1);
  cursor: pointer;
}

.input-section input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-border);
}

#startBtn {
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 500;
  font-family: "Poppins", sans-serif;
  background-color: var(--primary);
  color: var(--bg);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}

#startBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
  background-color: #059669;
}

#startBtn:active {
  transform: translateY(0);
}

.countdown-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.time-unit {
  text-align: center;
  min-width: 80px;
}

.number {
  font-size: 3rem;
  font-weight: 600;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

.separator {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: -20px;
}

.message {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--primary);
  min-height: 30px;
}

.message.error {
  color: var(--error);
}

.message.complete {
  color: var(--primary);
  font-size: 1.5rem;
}

@media (max-width: 600px) {
  .container {
    padding: 30px 20px;
  }

  header h1 {
    font-size: 2rem;
  }

  .number {
    font-size: 2.5rem;
  }

  .separator {
    font-size: 2rem;
    margin-top: -15px;
  }

  .time-unit {
    min-width: 70px;
  }
}