/*
  Fitness 1RM Tracker - Styles
  Dark theme with accent colors, mobile-first responsive design
  Large touch targets optimized for gym use
*/

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Dark theme (default) */
:root {
  /* Backgrounds */
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #232e42;
  /* Accent */
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --accent-soft: rgba(233, 69, 96, 0.15);
  /* Text */
  --text-primary: #f8f9fa;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  /* Utility */
  --border: #2b3445;
  --success: #34d399;
  --danger: #f87171;
  /* Card styling */
  --card-shadow: none;
  --card-border: none;
}

/* Light theme */
[data-theme="light"] {
  /* Backgrounds */
  --bg-primary: #f4f6fb;
  --bg-secondary: #e9edf7;
  --bg-card: #ffffff;
  /* Accent */
  --accent: #e94560;
  --accent-hover: #d63b55;
  --accent-soft: rgba(233, 69, 96, 0.12);
  /* Text */
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  /* Utility */
  --border: #d1d5e0;
  --success: #059669;
  --danger: #dc2626;
  /* Card styling */
  --card-shadow: none;
  --card-border: 1px solid var(--border);
}

/* Auto-detect system preference */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    /* Backgrounds */
    --bg-primary: #f4f6fb;
    --bg-secondary: #e9edf7;
    --bg-card: #ffffff;
    /* Accent */
    --accent: #e94560;
    --accent-hover: #d63b55;
    --accent-soft: rgba(233, 69, 96, 0.12);
    /* Text */
    --text-primary: #111827;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    /* Utility */
    --border: #d1d5e0;
    --success: #059669;
    --danger: #dc2626;
    /* Card styling */
    --card-shadow: none;
    --card-border: 1px solid var(--border);
  }
}

body {
  font-family: 'Avenir Next', 'Avenir', 'Trebuchet MS', 'Segoe UI', ui-sans-serif, system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

/* Login Screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-container {
  text-align: center;
  max-width: 320px;
}

.login-container h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-container p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.google-signin-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.5rem;
  background: #fff;
  color: #333;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.google-signin-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.google-signin-btn:active {
  transform: translateY(0);
}

/* App Container */
.app {
  max-width: 600px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: 2rem;
}

.hidden {
  display: none !important;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#user-name {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.logout-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.logout-btn:hover {
  color: var(--danger);
  border-color: var(--danger);
}

/* Navigation Link */
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 1rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--card-shadow);
  border: var(--card-border);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 100;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: var(--text-primary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

/* Show moon in dark mode (click to switch to light) */
:root:not([data-theme="light"]) .theme-toggle .icon-moon {
  display: block;
}

/* Show sun in light mode (click to switch to dark) */
[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

/* Handle system preference for icon display */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-toggle .icon-moon {
    display: none;
  }
  :root:not([data-theme="dark"]) .theme-toggle .icon-sun {
    display: block;
  }
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

.card h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-description {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* Input Groups */
.input-group {
  margin-bottom: 1rem;
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.input-group input::placeholder {
  color: var(--text-muted);
}

.field-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  line-height: 1.4;
}

.input-with-unit {
  position: relative;
}

.input-with-unit input {
  padding-right: 3rem;
}

.input-with-unit .unit {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.input-row-2 {
  grid-template-columns: 1fr 1fr;
}

.input-row-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.log-actions {
  display: flex;
  gap: 0.5rem;
}

.log-actions .primary-btn {
  flex: 1;
}

.log-actions .secondary-btn {
  flex: 0 0 auto;
}

/* Buttons */
.primary-btn {
  width: 100%;
  padding: 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.primary-btn:hover {
  background: var(--accent-hover);
}

.primary-btn:active {
  transform: scale(0.98);
}

.secondary-btn {
  padding: 0.875rem 1.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.secondary-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Calculator Section */
.calculator-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.calc-result {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  text-align: center;
}

.calc-result .main-result {
  margin-bottom: 1.5rem;
}

.formula-used {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.formula-label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.65rem;
  color: var(--text-muted);
}

.formula-value {
  font-weight: 600;
  color: var(--text-primary);
}
.calc-result .result-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.calc-result .result-value {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
}

.calc-result .result-unit {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-left: 0.25rem;
}

.rep-maxes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.rep-max-item {
  flex: 0 1 calc(33.333% - 0.75rem);
  min-width: 150px;
  padding: 0.75rem;
  background: var(--bg-primary);
  border-radius: 6px;
}

.rep-max-item .rep-count {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.rep-max-item .rep-weight {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.rep-max-item .rep-percent {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

/* Exercise Management */
.add-exercise {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.add-exercise input {
  flex: 1;
  padding: 0.875rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
}

.add-exercise input:focus {
  outline: none;
  border-color: var(--accent);
}

.exercise-list {
  list-style: none;
}

.exercise-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.exercise-list li:last-child {
  border-bottom: none;
}

.exercise-list .exercise-name {
  color: var(--text-primary);
}

.exercise-list .delete-btn {
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  font-size: 1.25rem;
  line-height: 1;
}

.exercise-list .delete-btn:hover {
  color: var(--danger);
}

/* History Section */
.history-filter {
  margin-bottom: 1rem;
}

.history-filter select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
}

.history-list {
  max-height: 400px;
  overflow-y: auto;
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

.history-item:last-child {
  margin-bottom: 0;
}

.history-item .exercise-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.history-item .exercise-name {
  font-weight: 600;
  color: var(--text-primary);
}

.history-item .workout-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.history-item .date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-item .stats {
  text-align: right;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.25rem;
}

.history-item .one-rm {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.history-item .percent-max {
  font-size: 0.75rem;
  color: var(--success);
  font-weight: 500;
}

.history-item .edit-btn {
  padding: 0.25rem 0.5rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0.25rem;
}

.history-item .edit-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.history-item .delete-log-btn {
  padding: 0.25rem 0.5rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0.25rem;
  margin-left: 0.25rem;
}

.history-item .delete-log-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
}

/* Scrollbar Styling */
.history-list::-webkit-scrollbar {
  width: 6px;
}

.history-list::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Responsive */
@media (max-width: 480px) {
  .header h1 {
    font-size: 1.25rem;
  }

  #user-name {
    display: none;
  }

  .calculator-inputs {
    grid-template-columns: 1fr;
  }

  .rep-maxes {
    justify-content: center;
  }

  .rep-max-item {
    flex-basis: calc(50% - 0.75rem);
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .input-row-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .history-item {
    grid-template-columns: 1fr;
  }

  .history-item .stats {
    flex-direction: row;
    justify-content: flex-start;
    gap: 1rem;
    margin-top: 0.5rem;
  }
}

/* Remove number input spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}