:root {
  --bg: #f3f7fc;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --text: #10233f;
  --muted: #59708d;
  --primary: #1d67d8;
  --primary-dark: #1248a0;
  --accent: #dbe8ff;
  --border: rgba(17, 48, 93, 0.12);
  --shadow: 0 20px 45px rgba(18, 72, 160, 0.12);
  --success: #109868;
  --danger: #d64545;
  --warning: #f5a524;
}

body.dark-theme {
  --bg: #0a1320;
  --surface: rgba(14, 26, 43, 0.9);
  --surface-strong: #12233a;
  --text: #eaf2ff;
  --muted: #9ab0cb;
  --primary: #4b96ff;
  --primary-dark: #7bb1ff;
  --accent: rgba(75, 150, 255, 0.14);
  --border: rgba(154, 176, 203, 0.15);
  --shadow: 0 20px 45px rgba(0, 0, 0, 0.28);
  --success: #39d39b;
  --danger: #ff7c7c;
  --warning: #ffc24b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Plus Jakarta Sans", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(29, 103, 216, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(17, 152, 218, 0.15), transparent 26%),
    var(--bg);
  color: var(--text);
  transition: background 0.3s ease, color 0.3s ease;
}

button,
input,
select,
textarea {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 22px;
  background: rgba(9, 28, 55, 0.94);
  color: #f3f8ff;
  display: flex;
  flex-direction: column;
  gap: 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 800;
  background: linear-gradient(135deg, #4b96ff, #72d7ff);
  color: #03162b;
  box-shadow: 0 14px 24px rgba(75, 150, 255, 0.35);
}

.brand h1,
.brand p,
.topbar h2,
.hero-card h3,
.card h3,
.countdown-panel h4 {
  margin: 0;
}

.brand p,
.eyebrow,
.hero-date,
.progress-label span,
.notes-footer small {
  color: var(--muted);
}

.brand p {
  color: rgba(243, 248, 255, 0.72);
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-link,
.theme-toggle {
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 13px 14px;
  color: inherit;
  background: transparent;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.nav-link:hover,
.nav-link.active,
.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.08);
  transform: translateX(4px);
}

.sidebar-footer {
  margin-top: auto;
}

.content {
  padding: 28px;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
}

.hero-card,
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  border-radius: 24px;
}

.hero-card {
  padding: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 22px;
  animation: fadeUp 0.6s ease;
}

.hero-card h3 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-top: 8px;
}

.hero-stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.mini-stat {
  min-width: 110px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 18px;
  display: grid;
  gap: 6px;
  text-align: center;
}

.mini-stat span {
  font-size: 1.3rem;
}

.grid-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.card {
  padding: 22px;
  animation: fadeUp 0.7s ease;
}

.full-width {
  grid-column: 1 / -1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.card-icon {
  font-size: 1.4rem;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--accent);
}

.inline-form,
.task-form {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.inline-form {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.task-form {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  border-radius: 14px;
  padding: 13px 14px;
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(29, 103, 216, 0.12);
}

button {
  border: none;
  border-radius: 14px;
  padding: 13px 16px;
  background: linear-gradient(135deg, var(--primary), #3cb8ff);
  color: white;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, opacity 0.22s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px rgba(29, 103, 216, 0.22);
}

.secondary-button {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}

.list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.list-item {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 15px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.item-main {
  display: grid;
  gap: 6px;
}

.item-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.92rem;
}

.task-status {
  display: flex;
  align-items: center;
  gap: 10px;
}

.task-complete {
  text-decoration: line-through;
  opacity: 0.75;
}

.badge {
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.badge.high {
  background: rgba(214, 69, 69, 0.14);
  color: var(--danger);
}

.badge.medium {
  background: rgba(245, 165, 36, 0.18);
  color: #b06f00;
}

.badge.low {
  background: rgba(16, 152, 104, 0.16);
  color: var(--success);
}

.icon-button {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0;
}

.progress-block {
  margin-bottom: 18px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.progress-track {
  width: 100%;
  height: 14px;
  background: var(--accent);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #56ceff);
  transition: width 0.35s ease;
}

.countdown-panel,
.pomodoro-panel {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
}

.pomodoro-panel {
  text-align: center;
}

.pomodoro-mode {
  font-weight: 700;
  color: var(--primary);
}

.pomodoro-time {
  font-size: clamp(2.2rem, 6vw, 3.7rem);
  font-weight: 800;
  margin: 10px 0 18px;
}

.pomodoro-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

textarea {
  resize: vertical;
  min-height: 220px;
}

.notes-footer {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.empty-state {
  color: var(--muted);
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    width: 280px;
    z-index: 20;
    transition: left 0.3s ease;
  }

  .sidebar.open {
    left: 0;
  }

  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .content {
    padding: 18px;
  }

  .grid-layout {
    grid-template-columns: 1fr;
  }

  .hero-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .full-width {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .hero-card,
  .card {
    border-radius: 20px;
    padding: 18px;
  }

  .notes-footer,
  .list-item {
    flex-direction: column;
    align-items: stretch;
  }

  .task-status {
    justify-content: space-between;
  }
}