:root {
  --bg: #eaf7ff;
  --panel: rgba(255, 255, 255, 0.82);
  --ink: #17324f;
  --muted: #6686a5;
  --line: #b9ddf5;
  --brand: #6bbcff;
  --brand-dark: #358dde;
  --accent: #9f7aea;
  --accent-soft: #f8d8ff;
  --danger: #c44578;
  --danger-bg: #ffe8f2;
  --gloss: rgba(255, 255, 255, 0.7);
  --shadow: 0 18px 45px rgba(81, 151, 207, 0.18);
}

body.dark-mode {
  --bg: #0f2138;
  --panel: rgba(22, 43, 72, 0.86);
  --ink: #eaf7ff;
  --muted: #a9c7df;
  --line: #375f86;
  --brand: #7cc7ff;
  --brand-dark: #9ed8ff;
  --accent: #d7b9ff;
  --accent-soft: #4a315f;
  --danger: #ff9cbc;
  --danger-bg: rgba(255, 156, 188, 0.14);
  --gloss: rgba(255, 255, 255, 0.22);
  --shadow: 0 18px 45px rgba(2, 12, 28, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 10%, rgba(255, 255, 255, 0.95) 0 90px, transparent 91px),
    radial-gradient(circle at 84% 8%, rgba(248, 216, 255, 0.72) 0 110px, transparent 112px),
    linear-gradient(180deg, #dff4ff 0%, #f5fbff 48%, #e9f7ff 100%);
  color: var(--ink);
  font-family: "DM Sans", Arial, Helvetica, sans-serif;
  line-height: 1.5;
  transition: background 0.25s ease, color 0.25s ease;
}

body.dark-mode {
  background:
    radial-gradient(circle at 12% 10%, rgba(124, 199, 255, 0.22) 0 90px, transparent 91px),
    radial-gradient(circle at 84% 8%, rgba(215, 185, 255, 0.2) 0 110px, transparent 112px),
    linear-gradient(180deg, #071426 0%, #10233c 50%, #172b49 100%);
}

button,
input,
select {
  font: inherit;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 32px clamp(18px, 5vw, 64px);
  background:
    linear-gradient(135deg, rgba(107, 188, 255, 0.95), rgba(210, 239, 255, 0.95) 58%, rgba(248, 216, 255, 0.95)),
    #cceeff;
  color: #123453;
  border-bottom: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 45px rgba(53, 141, 222, 0.2);
}

body.dark-mode .site-header {
  background:
    linear-gradient(135deg, rgba(22, 43, 72, 0.96), rgba(28, 66, 108, 0.96) 58%, rgba(74, 49, 95, 0.96)),
    #10233c;
  color: var(--ink);
  border-bottom-color: rgba(124, 199, 255, 0.22);
  box-shadow: 0 18px 45px rgba(2, 12, 28, 0.36);
}

.site-header h1,
.section-heading h2 {
  margin: 0;
  letter-spacing: 0;
}

.tagline {
  margin: 8px 0 0;
  max-width: 680px;
  color: #365f82;
}

body.dark-mode .tagline {
  color: var(--muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.tab-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 8px;
  padding: 12px clamp(18px, 5vw, 64px);
  background: rgba(234, 247, 255, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
  overflow-x: auto;
}

body.dark-mode .tab-nav {
  background: rgba(15, 33, 56, 0.82);
}

.tab-button,
.primary-button,
.secondary-button,
.danger-button,
.theme-toggle,
.table-action {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

.theme-toggle {
  min-height: 42px;
  padding: 10px 15px;
  background: rgba(255, 255, 255, 0.58);
  color: #123453;
  box-shadow: inset 0 1px 0 var(--gloss), 0 10px 20px rgba(53, 141, 222, 0.14);
}

body.dark-mode .theme-toggle {
  background: rgba(124, 199, 255, 0.16);
  color: var(--ink);
  border: 1px solid rgba(124, 199, 255, 0.28);
}

.tab-button {
  flex: 0 0 auto;
  padding: 10px 14px;
  background: transparent;
  color: var(--muted);
}

.tab-button.active {
  background: linear-gradient(135deg, #7cc7ff, #b8e6ff);
  color: #123453;
  box-shadow: inset 0 1px 0 var(--gloss), 0 8px 18px rgba(53, 141, 222, 0.18);
}

body.dark-mode .tab-button.active {
  background: linear-gradient(135deg, #315f9b, #7cc7ff);
  color: #f5fbff;
}

main {
  padding: 28px clamp(18px, 5vw, 64px) 44px;
}

.page-section {
  display: none;
}

.page-section.active {
  display: block;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 18px;
}

.muted {
  color: var(--muted);
}

.stats-grid,
.dashboard-grid,
.content-grid {
  display: grid;
  gap: 18px;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.dashboard-grid,
.content-grid {
  grid-template-columns: minmax(280px, 0.9fr) minmax(380px, 1.4fr);
  align-items: start;
}

.stat-card,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
}

.stat-card::before,
.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  height: 46%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0));
  pointer-events: none;
}

.stat-card {
  padding: 18px;
}

.stat-card > *,
.panel > * {
  position: relative;
}

.stat-card span,
.stat-card small {
  display: block;
  color: var(--muted);
}

.stat-card strong {
  display: block;
  margin: 6px 0;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.1;
}

.panel {
  padding: 20px;
}

.panel + .panel {
  margin-top: 18px;
}

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

.panel h3 {
  margin: 0 0 14px;
}

.panel-header h3 {
  margin: 0;
}

.form-panel {
  display: grid;
  gap: 10px;
}

.narrow-panel {
  max-width: 760px;
}

label {
  color: #315b7a;
  font-weight: 700;
}

input,
select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid #abd8f5;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

body.dark-mode input,
body.dark-mode select {
  background: rgba(9, 22, 40, 0.82);
  border-color: #446c92;
  color: var(--ink);
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid rgba(107, 188, 255, 0.34);
  outline-offset: 2px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

#workoutForm .form-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button,
.danger-button {
  min-height: 42px;
  padding: 10px 15px;
}

.primary-button {
  background: linear-gradient(135deg, #60b8ff, #bce9ff);
  color: #123453;
  box-shadow: inset 0 1px 0 var(--gloss), 0 10px 20px rgba(53, 141, 222, 0.18);
}

body.dark-mode .primary-button {
  background: linear-gradient(135deg, #315f9b, #7cc7ff);
  color: #f5fbff;
}

.primary-button:hover,
.tab-button.active:hover {
  background: linear-gradient(135deg, #4aa9f7, #aee2ff);
}

.secondary-button {
  display: none;
  background: #e7f5ff;
  color: #315b7a;
}

body.dark-mode .secondary-button {
  background: rgba(124, 199, 255, 0.14);
  color: var(--ink);
}

.secondary-button.show {
  display: inline-block;
}

.danger-button {
  background: var(--danger-bg);
  color: var(--danger);
}

.form-message {
  min-height: 22px;
  margin: 0;
  color: var(--danger);
  font-weight: 700;
}

.form-message.success {
  color: var(--brand-dark);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #466b8c;
  font-size: 0.86rem;
}

.table-action {
  margin: 0 4px 4px 0;
  padding: 7px 9px;
  background: #e5f5ff;
  color: var(--brand-dark);
}

.delete-action {
  background: var(--danger-bg);
  color: var(--danger);
}

.empty-state {
  padding: 16px;
  color: var(--muted);
  background: rgba(245, 251, 255, 0.82);
  border: 1px dashed #9ed4f6;
  border-radius: 8px;
}

body.dark-mode .empty-state {
  background: rgba(9, 22, 40, 0.52);
  border-color: #446c92;
}

.record-list {
  display: grid;
  gap: 10px;
}

.record-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(226, 246, 255, 0.85));
}

body.dark-mode .record-item {
  background: linear-gradient(135deg, rgba(15, 33, 56, 0.92), rgba(28, 66, 108, 0.72));
}

.record-item strong {
  color: var(--brand-dark);
}

.mini-total {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.mini-total span {
  padding: 8px 10px;
  border-radius: 8px;
  background: #e5f5ff;
  color: var(--brand-dark);
  font-weight: 700;
}

.chart-box {
  min-height: 230px;
}

.chart-box svg {
  width: 100%;
  height: 230px;
  display: block;
}

.chart-label {
  fill: var(--muted);
  font-size: 12px;
}

footer {
  padding: 24px clamp(18px, 5vw, 64px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.34);
}

body.dark-mode footer {
  background: rgba(9, 22, 40, 0.34);
}

@media (max-width: 920px) {
  .site-header,
  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .stats-grid,
  .dashboard-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .mini-total {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .site-header {
    padding-top: 24px;
  }

  main {
    padding-top: 20px;
  }

  .form-row,
  #workoutForm .form-row {
    grid-template-columns: 1fr;
  }

  .panel,
  .stat-card {
    padding: 16px;
  }
}