@import url("https://fonts.googleapis.com/css2?family=Rubik:wght@400;600&display=swap");

:root {
  --bg-top: #f6f3eb;
  --bg-bottom: #d7e7f0;
  --card: #ffffff;
  --ink: #1e2b2a;
  --muted: #5f6a6a;
  --accent: #2f6f63;
  --accent-strong: #1e534b;
  --disabled: #b8b8b8;
  --shadow: 0 14px 30px rgba(35, 42, 54, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Rubik", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top, var(--bg-top), var(--bg-bottom));
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 16px;
  background: rgba(246, 243, 235, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(30, 43, 42, 0.08);
  animation: slide-down 450ms ease-out;
}

.start-btn {
  width: 100%;
  padding: 16px 18px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 2px;
  border: none;
  border-radius: 14px;
  color: #ffffff;
  background: linear-gradient(130deg, var(--accent), var(--accent-strong));
  box-shadow: var(--shadow);
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.start-btn:active {
  transform: translateY(1px) scale(0.99);
}

.start-btn:disabled {
  background: var(--disabled);
  color: #ffffff;
  box-shadow: none;
  opacity: 0.75;
}

.status-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 14px;
}

.status-item {
  background: var(--card);
  padding: 10px 12px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-size: 14px;
  color: var(--muted);
  animation: fade-in 600ms ease-out;
}

.content {
  padding: 18px 16px 32px;
  animation: fade-in 650ms ease-out;
}

.hint {
  margin: 8px 0 18px;
  font-size: 15px;
  color: var(--muted);
}

.log-panel {
  background: var(--card);
  padding: 16px;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.log-panel h2 {
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--ink);
}

.log-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.log-list li {
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(47, 111, 99, 0.08);
  color: var(--ink);
  font-size: 14px;
}

@keyframes slide-down {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 640px) {
  .top-bar {
    padding: 20px 24px;
  }

  .content {
    padding: 24px 24px 40px;
  }

  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}