/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #1a1a2e;
  color: #eaeaea;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
}

/* ── App Wrapper ──────────────────────────────────────────────────────────── */
#app {
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ── Timer Section ────────────────────────────────────────────────────────── */
#time {
  background: #16213e;
  border-radius: 16px;
  padding: 40px 32px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

#session-label {
  font-size: 1rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #e94560;
  margin-bottom: 12px;
}

#timer-display {
  font-size: 6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #ffffff;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  margin-bottom: 16px;
}

#pomodoro-count {
  font-size: 0.85rem;
  color: #a0a0b0;
  margin-bottom: 28px;
}

/* ── Control Buttons ──────────────────────────────────────────────────────── */
#controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

#controls button {
  padding: 10px 28px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, opacity 0.2s;
}

#btn-start {
  background: #e94560;
  color: #fff;
}

#btn-start:hover:not(:disabled) {
  background: #c73652;
  transform: translateY(-1px);
}

#btn-pause {
  background: #0f3460;
  color: #eaeaea;
}

#btn-pause:hover:not(:disabled) {
  background: #1a4f8a;
  transform: translateY(-1px);
}

#btn-reset {
  background: #2a2a4a;
  color: #eaeaea;
}

#btn-reset:hover {
  background: #3a3a5a;
  transform: translateY(-1px);
}

#controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ── Session-type Buttons ─────────────────────────────────────────────────── */
#session-buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.session-btn {
  padding: 7px 18px;
  border: 2px solid #e94560;
  border-radius: 20px;
  background: transparent;
  color: #e94560;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.1s;
}

.session-btn:hover {
  background: #e94560;
  color: #fff;
  transform: translateY(-1px);
}

.session-btn.active {
  background: #e94560;
  color: #fff;
}

/* ── Task Section ─────────────────────────────────────────────────────────── */
.tasks-container {
  background: #16213e;
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.form form {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

#it {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 2px solid #0f3460;
  border-radius: 8px;
  background: #1a1a2e;
  color: #eaeaea;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

#it:focus {
  border-color: #e94560;
}

#bAdd {
  padding: 10px 20px;
  background: #e94560;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

#bAdd:hover {
  background: #c73652;
  transform: translateY(-1px);
}

/* ── Task Items ───────────────────────────────────────────────────────────── */
#tasks {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #1a1a2e;
  border-radius: 10px;
  padding: 12px 16px;
  border: 1px solid #0f3460;
  transition: border-color 0.2s;
}

.task:hover {
  border-color: #e94560;
}

.task--done {
  opacity: 0.55;
}

.task .title {
  flex: 1;
  font-size: 0.95rem;
  word-break: break-word;
}

.task .completed {
  flex-shrink: 0;
}

.start-button {
  padding: 6px 14px;
  background: transparent;
  border: 2px solid #e94560;
  border-radius: 6px;
  color: #e94560;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.start-button:hover {
  background: #e94560;
  color: #fff;
}

.done {
  font-size: 0.82rem;
  color: #4caf82;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 420px) {
  #timer-display {
    font-size: 4rem;
  }

  #time {
    padding: 28px 16px;
  }

  .tasks-container {
    padding: 20px 16px;
  }
}