:root {
  --bg: #ffe9d4;
  --surface: #ffffff;
  --text: #3a2410;
  --text-muted: #8a7d72;
  --border: #f1e1cf;
  --primary: #ff7a14;
  --primary-hover: #e6690a;
  --primary-soft: #fff0e0;
  --secondary: #2b6f76;
  --secondary-hover: #235a60;
  --danger: #e0303a;
  --danger-soft: #fde8e8;
  --success: #16a34a;
  --ink: #3a2410;
  --on-primary: #ffffff;
  --exercise-text: #241f1a;
  --radius: 8px;
  --transition-fast: 0.2s ease;
}

:root[data-theme="dark"] {
  --bg: #18130f;
  --surface: #221b15;
  --text: #f5ece3;
  --text-muted: #b3a596;
  --border: #3a2d22;
  --primary: #ff8a30;
  --primary-hover: #ffa158;
  --primary-soft: #3a2415;
  --secondary: #4fb4bd;
  --secondary-hover: #6fc8cf;
  --danger: #ff6b6b;
  --danger-soft: #3a1f1f;
  --success: #34d399;
  --ink: #f5ece3;
  --on-primary: #1c140d;
  --exercise-text: var(--text);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.site-footer {
  margin-top: auto;
  text-align: center;
  padding: 1.25rem 1rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}
.site-footer p {
  margin: 0;
}

h1, h2, h3 {
  margin: 0 0 0.5em;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

/* Top navigation */
.topnav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.5rem;
}
.topnav .brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.topnav .brand:hover {
  color: var(--primary);
  text-decoration: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle .burger-line {
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.open .burger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle.open .burger-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open .burger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-links a.active,
.nav-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

.link-btn {
  background: var(--ink);
  color: var(--on-primary);
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.4rem 0.9rem;
}
.link-btn:hover {
  background: var(--danger);
}

/* Icon buttons (theme toggle) */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  flex-shrink: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  padding: 0;
}
.icon-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}
.icon-sun {
  display: none;
}
.icon-moon {
  display: block;
}
[data-theme="dark"] .icon-sun {
  display: block;
}
[data-theme="dark"] .icon-moon {
  display: none;
}

.theme-toggle-corner {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 3rem;
}

.hint {
  color: var(--text-muted);
  margin-top: -0.25rem;
  margin-bottom: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.exercise-list {
  margin: 0.5rem 0 1rem;
  padding-left: 1.25rem;
}
.exercise-list li {
  margin-bottom: 0.3rem;
  color: var(--exercise-text);
}

.status-complete {
  color: var(--success);
  font-weight: 600;
}

/* Forms (auth + inline) */
.auth-body {
  background: var(--bg);
}
.auth-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  width: 100%;
  max-width: 380px;
  text-align: center;
}
.auth-card .brand {
  font-weight: 800;
  letter-spacing: -0.02em;
}
.auth-card .brand a {
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.auth-card .brand a:hover {
  color: var(--primary);
}
.auth-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.switch-link {
  margin-top: 1.25rem;
  color: var(--text-muted);
}

form {
  display: flex;
  flex-direction: column;
  text-align: left;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0.75rem 0 0.3rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font: inherit;
  width: 100%;
  background: var(--surface);
  color: var(--text);
}
input:focus,
textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

textarea {
  resize: vertical;
}

button[type="submit"],
button.add-btn,
#complete-btn,
#modal-confirm {
  margin-top: 1.25rem;
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: 5px;
  padding: 0.6rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button[type="submit"]:hover,
button.add-btn:hover,
#complete-btn:hover,
#modal-confirm:hover {
  background: var(--primary-hover);
}

button.edit-btn {
  margin-top: 1.25rem;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 5px;
  padding: calc(0.6rem - 2px) calc(1rem - 2px);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button.edit-btn:hover {
  background: var(--primary);
  color: var(--on-primary);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.error-message {
  color: var(--danger);
  font-size: 0.85rem;
  min-height: 1.1em;
  margin: 0.5rem 0 0;
}
.success-message {
  color: var(--success);
  font-size: 0.85rem;
  min-height: 1.1em;
  margin: 0.5rem 0 0;
}

/* Planner */
.planner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.day-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
}
.day-card .add-btn {
  margin-top: auto;
  align-self: flex-end;
}
.day-card .workout-name {
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.day-card .empty-hint {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.exercise-row {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}
.exercise-row input {
  flex: 1;
}
.remove-exercise-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  width: 2rem;
  cursor: pointer;
  color: var(--danger);
  font-size: 1rem;
}

.add-exercise-btn,
.cancel-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.4rem 0.7rem;
  font: inherit;
  cursor: pointer;
  margin-top: 0.3rem;
  width: fit-content;
  color: var(--text);
}
.add-exercise-btn:hover,
.cancel-btn:hover {
  border-color: var(--secondary);
  color: var(--secondary);
}

.form-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.form-actions .cancel-btn {
  margin-top: 1.25rem;
}

/* History calendar */
.calendar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  max-width: 560px;
  margin: 0 auto;
}
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.calendar-header h2 {
  margin: 0;
  font-size: 1.05rem;
  min-width: 10rem;
  text-align: center;
}
.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.35rem;
}
.day-cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  border: 2px solid transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.day-cell.empty {
  background: transparent;
}
.day-cell.today {
  border-color: var(--secondary);
  font-weight: 700;
}
.day-cell.completed {
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  cursor: pointer;
}
.day-cell.completed:hover,
.day-cell.completed:focus {
  background: var(--primary-hover);
  outline: none;
}

.day-tooltip {
  position: fixed;
  transform: translate(-50%, calc(-100% - 10px));
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  box-shadow: 0 16px 32px rgba(36, 31, 26, 0.2);
  font-size: 0.85rem;
  max-width: 220px;
  z-index: 1200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease;
  pointer-events: none;
}
.day-tooltip.visible {
  opacity: 1;
  visibility: visible;
}
.day-tooltip strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.day-tooltip span {
  display: block;
  color: var(--text-muted);
}

/* Modal (notes popup) */
body.modal-open {
  overflow: hidden;
}
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(36, 31, 26, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
}
.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 24px 48px rgba(36, 31, 26, 0.25);
}
.modal h2 {
  font-size: 1.15rem;
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 1.25rem;
}
.modal-actions .cancel-btn {
  margin-top: 0;
}
#modal-confirm {
  margin-top: 0;
}

/* Responsive breakpoints */
@media (max-width: 640px) {
  .topnav {
    padding: 0.7rem 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    box-shadow: 0 12px 20px rgba(36, 31, 26, 0.08);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .container {
    padding: 1.25rem 1rem 2.5rem;
  }
  h1 {
    font-size: 1.35rem;
  }
  .card {
    padding: 1.1rem;
  }
  .auth-card {
    padding: 1.5rem 1.25rem;
    margin: 1rem;
    max-width: none;
    width: calc(100% - 2rem);
  }
  .planner-grid {
    grid-template-columns: 1fr;
  }
  .day-card {
    padding: 1rem;
  }
  .calendar {
    padding: 1rem 0.75rem;
  }
  .day-cell {
    font-size: 0.8rem;
    border-radius: 4px;
  }
  .form-actions {
    flex-wrap: wrap;
  }
}

@media (max-width: 400px) {
  .topnav .brand {
    font-size: 1.05rem;
  }
  .modal {
    padding: 1.25rem;
  }
}