:root {
  --bg: #0f172a;
  --bg-accent: #1e293b;
  --panel-bg: rgba(15, 23, 42, 0.68);
  --panel-border: rgba(148, 163, 184, 0.25);
  --accent: #f97316;
  --accent-dark: #ea580c;
  --text: #f8fafc;
  --text-light: #cbd5f5;
  --border: rgba(148, 163, 184, 0.2);
  --success: #22c55e;
  --failed: #ef4444;
  --active: #38bdf8;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.45);
  font-family: "Pretendard", "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 10% 20%, rgba(248, 113, 113, 0.38), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(14, 165, 233, 0.32), transparent 50%),
    linear-gradient(160deg, #0f172a 0%, #111827 48%, #1e1b4b 100%);
  color: var(--text);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(248, 250, 252, 0.18), transparent 65%);
  filter: blur(0px);
  z-index: 0;
}

body::before {
  top: -120px;
  left: -80px;
}

body::after {
  bottom: -140px;
  right: -100px;
}

main {
  width: min(960px, 92vw);
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.app-header,
.app-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  background: transparent;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(2.15rem, 4.5vw, 3rem);
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.5rem auto 0;
  max-width: 40rem;
  color: var(--text-light);
  line-height: 1.6;
}

.app-footer {
  font-size: 0.95rem;
  color: var(--text-light);
}

.panel {
  background: var(--panel-bg);
  border-radius: 22px;
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(22px);
}

.motivation {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.motivation p {
  margin: 0;
  line-height: 1.7;
  color: var(--text-light);
}

.motivation-link {
  font-size: 0.98rem;
}

.motivation a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-bottom-color 0.2s ease;
}

.motivation a:hover,
.motivation a:focus-visible {
  color: var(--accent-dark);
  border-bottom-color: currentColor;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.status-indicator {
  font-weight: 600;
  color: var(--text-light);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.status-indicator::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  box-shadow: 0 0 0 4px rgba(148, 163, 184, 0.28);
  transition: background 0.2s ease;
}

.status-indicator.active::before {
  background: var(--success);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.25);
}

.stat-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 0;
}

.stat-list dt {
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.82rem;
}

.stat-list dd {
  margin: 0.45rem 0 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.6rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:focus-visible {
  outline: 3px solid rgba(249, 115, 22, 0.4);
  outline-offset: 2px;
}

button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 22px rgba(249, 115, 22, 0.28);
}

button.primary:hover,
button.primary:active {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

button.secondary {
  background: rgba(56, 189, 248, 0.18);
  color: #e0f2fe;
}

button.secondary:hover,
button.secondary:active {
  background: rgba(56, 189, 248, 0.25);
  transform: translateY(-1px);
}

button.ghost {
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-light);
}

button.ghost:hover,
button.ghost:active {
  background: rgba(148, 163, 184, 0.2);
  transform: translateY(-1px);
}

.custom-start {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.custom-start label {
  font-weight: 600;
  color: var(--text-light);
}

.form-feedback {
  margin: 0;
  font-size: 0.9rem;
  color: var(--accent);
}

.input-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

input[type="datetime-local"] {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  color: var(--text);
  background: rgba(15, 23, 42, 0.6);
  min-width: 220px;
  flex: 1;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

input[type="datetime-local"]:focus {
  outline: none;
  border-color: rgba(56, 189, 248, 0.7);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

.records .helper-text {
  margin-top: -0.25rem;
  color: var(--text-light);
  font-size: 0.95rem;
}

.record-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 1.2rem;
}

.record-item {
  padding: 1.5rem 1.6rem;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  background: linear-gradient(140deg, rgba(15, 23, 42, 0.72), rgba(30, 41, 59, 0.88));
  display: grid;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
}

.record-item h3 {
  margin: 0;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.record-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-light);
}

.duration-chip {
  background: rgba(34, 197, 94, 0.16);
  color: var(--success);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-weight: 600;
}

.status-badge {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: rgba(148, 163, 184, 0.16);
  color: var(--text-light);
}

.status-badge.status-completed {
  border-color: rgba(34, 197, 94, 0.5);
  background: rgba(34, 197, 94, 0.15);
  color: #bbf7d0;
}

.status-badge.status-failed {
  border-color: rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.18);
  color: #fecaca;
}

.status-badge.status-active {
  border-color: rgba(56, 189, 248, 0.5);
  background: rgba(56, 189, 248, 0.18);
  color: #bae6fd;
}

.record-item::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: radial-gradient(circle at top right, rgba(248, 113, 113, 0.28), transparent 45%);
}

.record-item:hover::after {
  opacity: 1;
}

.record-item.record-completed {
  border-color: rgba(34, 197, 94, 0.3);
}

.record-item.record-failed {
  border-color: rgba(239, 68, 68, 0.4);
  background: linear-gradient(150deg, rgba(15, 23, 42, 0.7), rgba(64, 17, 29, 0.9));
}

.record-item.record-active {
  border-color: rgba(56, 189, 248, 0.3);
}

.record-failure-reason {
  margin: 0;
  font-size: 0.95rem;
  color: #fecaca;
  background: rgba(239, 68, 68, 0.15);
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.feedback {
  margin-top: 1.25rem;
  padding: 0.9rem 1.1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  background: rgba(239, 68, 68, 0.12);
  color: #fecaca;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.hidden {
  display: none !important;
}

@media (max-width: 640px) {
  .panel {
    padding: 1.6rem;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
  }

  button {
    width: 100%;
    justify-content: center;
  }

  .input-group {
    flex-direction: column;
  }

  .record-item {
    padding: 1.3rem;
  }
}