:root {
  --color-bg-primary: #f9fafb;
  --color-bg-secondary: #f2f4f7;
  --color-bg-card: #ffffff;
  --color-fg-primary: #101828;
  --color-fg-secondary: #475467;
  --color-fg-tertiary: #667085;
  --color-border-primary: #eaecf0;
  --color-border-brand: #e8b8f0;
  --color-brand-600: #af1ac7;
  --color-brand-700: #8d159f;
  --color-success-600: #079455;
  --color-error-600: #d92d20;

  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-sm: 0 4px 8px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 10px 24px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--color-fg-primary);
  background:
    radial-gradient(circle at 0% 0%, rgba(175, 26, 199, 0.12), transparent 30%),
    radial-gradient(circle at 100% 0%, rgba(209, 106, 225, 0.14), transparent 28%),
    linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 55%);
  padding: 32px 14px;
}

.hidden {
  display: none;
}

.app {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0 10px;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  margin-bottom: 14px;
}

.login-card {
  max-width: 480px;
  margin: 60px auto;
}

.login-card h1 {
  margin: 0;
  font-size: 1.8rem;
}

.login-form {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.auth-help {
  margin-top: 14px;
}

.app-header {
  background: linear-gradient(180deg, #ffffff 0%, #fdfdff 100%);
  border: 1px solid var(--color-border-brand);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 20px;
  margin-bottom: 16px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.brand-row {
    display: inline-flex;
    align-items: flex-start;
    margin-bottom: 8px;
    padding: 8px 2px;
    flex-direction: column;
    align-content: flex-start;
    justify-content: center;
}

.brand-logo {
  width: 220px;
  height: auto;
  display: block;
}

.user-panel {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-label {
  font-size: 0.88rem;
  color: var(--color-fg-secondary);
  font-weight: 600;
}

.logout-btn {
  background: #ffffff;
  color: var(--color-brand-700);
  border: 1px solid var(--color-border-brand);
  box-shadow: none;
}

h1 {
  margin: 10px 0 0;
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.subtitle {
  margin: 12px 0 0;
  max-width: 760px;
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--color-fg-secondary);
}

.task-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(185px, 1fr));
  gap: 12px;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 6px;
  color: var(--color-fg-secondary);
  font-size: 0.88rem;
  font-weight: 500;
}

input {
  width: 100%;
  border: 1px solid #d0d5dd;
  border-radius: 10px;
  background: #ffffff;
  color: var(--color-fg-primary);
  padding: 10px 12px;
  font: inherit;
  box-shadow: var(--shadow-xs);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

input::placeholder {
  color: #98a2b3;
}

input:focus {
  border-color: var(--color-brand-600);
  box-shadow: 0 0 0 4px rgba(175, 26, 199, 0.16);
  outline: none;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font: 600 0.92rem "Inter", sans-serif;
  cursor: pointer;
  color: #ffffff;
  background: linear-gradient(180deg, var(--color-brand-600) 0%, var(--color-brand-700) 100%);
  box-shadow: 0 2px 6px rgba(175, 26, 199, 0.28);
  transition: transform 0.12s ease, opacity 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

.danger {
  background: linear-gradient(180deg, #f04438 0%, var(--color-error-600) 100%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.stat-card {
  background: #ffffff;
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: 14px;
  box-shadow: var(--shadow-xs);
}

.stat-label {
  margin: 0;
  font-size: 0.84rem;
  color: var(--color-fg-tertiary);
}

.stat-value {
  margin: 8px 0 0;
  font-size: 1.42rem;
  font-weight: 700;
  color: var(--color-fg-primary);
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.tabs {
  display: inline-flex;
  gap: 8px;
  padding: 4px;
  border: 1px solid var(--color-border-primary);
  border-radius: 12px;
  background: #f9fafb;
}

.tab-button {
  color: var(--color-fg-secondary);
  background: transparent;
  box-shadow: none;
  border: 1px solid transparent;
  padding: 8px 14px;
}

.tab-button:hover {
  transform: none;
  background: #f2f4f7;
}

.tab-button.active {
  color: #ffffff;
  background: linear-gradient(180deg, var(--color-brand-600) 0%, var(--color-brand-700) 100%);
  box-shadow: 0 2px 6px rgba(175, 26, 199, 0.28);
}

.task-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.task-item {
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  background: #ffffff;
  padding: 12px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.task-content h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.meta {
  margin: 4px 0;
  color: var(--color-fg-tertiary);
  font-size: 0.89rem;
}

.task-actions {
  display: flex;
  gap: 8px;
}

.task-actions button {
  padding: 8px 10px;
  font-size: 0.83rem;
}

.complete {
  background: linear-gradient(180deg, #12b76a 0%, var(--color-success-600) 100%);
}

.completed .task-content h3 {
  text-decoration: line-through;
  color: var(--color-fg-tertiary);
}

@media (max-width: 860px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body {
    padding-top: 20px;
  }

  .app-header,
  .card {
    padding: 14px;
  }

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

  .brand-logo {
    width: 180px;
  }

  .list-header {
    flex-direction: column;
    align-items: stretch;
  }

  .tabs {
    width: 100%;
  }

  .tab-button {
    flex: 1;
  }

  .task-item {
    flex-direction: column;
  }

  .task-actions {
    width: 100%;
  }

  .task-actions button {
    flex: 1;
  }
}

.advance-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.advance-input {
  width: 120px;
  padding: 6px 8px;
  border: 1px solid #d0d5dd;
  border-radius: 8px;
  font: inherit;
}

.save-advance {
  padding: 6px 10px;
  font-size: 0.8rem;
  box-shadow: none;
}