/* ── CSS Variables ──────────────────────────────────────────────────────────── */

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #252542;
  --bg-input: #1e1e36;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a82;
  --accent: #6c5ce7;
  --accent-hover: #5b4cdb;
  --success: #00d26a;
  --warning: #ffc107;
  --danger: #ff4757;
  --border: #3a3a5c;
  --shadow: rgba(0, 0, 0, 0.3);

  /* Muscle group colors */
  --color-abs: #ffc107;
  --color-back: #6c5ce7;
  --color-biceps: #e84393;
  --color-calves: #00b894;
  --color-chest: #ff6b6b;
  --color-forearms: #fdcb6e;
  --color-glutes: #e17055;
  --color-hamstrings: #00cec9;
  --color-quads: #0984e3;
  --color-shoulders: #a29bfe;
  --color-traps: #55a3e8;
  --color-triceps: #fd79a8;

  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --nav-height: 60px;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */

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

html {
  height: 100%;
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100%;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
}

input, button, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ── Login ─────────────────────────────────────────────────────────────────── */

.login-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 20px;
}

.login-screen h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.login-screen p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.login-form {
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-form input {
  padding: 14px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}

.login-form input:focus {
  border-color: var(--accent);
}

.login-error {
  color: var(--danger);
  font-size: 14px;
  text-align: center;
  min-height: 20px;
}

/* ── App Shell ─────────────────────────────────────────────────────────────── */

.app {
  display: none;
  height: 100%;
  flex-direction: column;
}

.app.active {
  display: flex;
}

.view-container {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.view {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: none;
  flex-direction: column;
}

.view.active {
  display: flex;
}

/* ── Bottom Nav ────────────────────────────────────────────────────────────── */

.bottom-nav {
  display: flex;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding-bottom: var(--safe-bottom);
  height: calc(var(--nav-height) + var(--safe-bottom));
  flex-shrink: 0;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.nav-tab.active {
  color: var(--accent);
}

.nav-tab svg {
  width: 24px;
  height: 24px;
}

.nav-tab span {
  font-size: 11px;
  font-weight: 600;
}

/* ── Top Bar ───────────────────────────────────────────────────────────────── */

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.top-bar h2 {
  font-size: 18px;
  font-weight: 700;
}

.top-bar-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */

.btn {
  padding: 12px 20px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

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

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

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

.btn-small {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 8px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

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

.btn-large {
  width: 100%;
  padding: 14px;
  font-size: 16px;
}

/* ── Search Bar ────────────────────────────────────────────────────────────── */

.search-container {
  padding: 12px 16px;
  background: var(--bg-primary);
  flex-shrink: 0;
}

.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input-wrap svg {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 12px 12px 12px 40px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--accent);
}

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

/* ── Filter Toggle ─────────────────────────────────────────────────────────── */

.filter-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.filter-toggle:active {
  opacity: 0.7;
}

.filter-chevron {
  transition: transform 0.2s;
  margin-left: auto;
}

.filter-toggle.open .filter-chevron {
  transform: rotate(180deg);
}

.filter-active-count {
  font-size: 11px;
  font-weight: 700;
  background: var(--accent);
  color: white;
  border-radius: 10px;
  padding: 1px 7px;
  display: none;
}

.filter-active-count.visible {
  display: inline-block;
}

.filter-panel {
  display: none;
  flex-direction: column;
  flex-shrink: 0;
  padding-bottom: 4px;
}

.filter-panel.open {
  display: flex;
}

.filter-section-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 16px 6px;
}

/* ── Filter Chips ──────────────────────────────────────────────────────────── */

.filter-bar {
  padding: 0 16px 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-shrink: 0;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-chip {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ── Exercise List ─────────────────────────────────────────────────────────── */

.exercise-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0 16px 16px;
}

.exercise-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 12px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

.exercise-item:active {
  background: var(--bg-input);
}

.muscle-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.exercise-info {
  flex: 1;
  min-width: 0;
}

.exercise-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.exercise-meta {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.exercise-last-used {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}

.exercise-last-used svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.exercise-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
}

.exercise-count {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 14px;
}

.no-results {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

/* ── Tracking View ─────────────────────────────────────────────────────────── */

.tracking-header {
  padding: 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tracking-back {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  margin-bottom: 12px;
  -webkit-tap-highlight-color: transparent;
}

.tracking-back svg {
  width: 18px;
  height: 18px;
}

.tracking-exercise-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.tracking-exercise-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 13px;
}

.tracking-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.tracking-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px;
}

/* ── Set Grid ──────────────────────────────────────────────────────────────── */

.set-grid-header {
  display: grid;
  grid-template-columns: 36px 1fr 1fr 32px;
  gap: 6px;
  padding: 0 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.set-grid-header span {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.set-row {
  display: grid;
  grid-template-columns: 36px 1fr 1fr 32px;
  gap: 6px;
  align-items: center;
  margin-bottom: 8px;
}

.set-number {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  text-align: center;
}

.set-input {
  padding: 10px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  width: 100%;
  min-width: 0;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}

.set-input::-webkit-outer-spin-button,
.set-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.set-input:focus {
  border-color: var(--accent);
}

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

.set-delete {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.set-delete:hover {
  color: var(--danger);
  background: rgba(255, 71, 87, 0.1);
}

.add-set-btn {
  width: 100%;
  padding: 12px;
  margin-top: 4px;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

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

.save-section {
  padding: 16px;
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding-bottom: calc(16px + var(--safe-bottom));
}

.save-feedback {
  text-align: center;
  padding: 8px;
  font-size: 14px;
  font-weight: 600;
  min-height: 38px;
}

.save-feedback.success {
  color: var(--success);
}

.save-feedback.error {
  color: var(--danger);
}

/* ── History View ──────────────────────────────────────────────────────────── */

.history-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px;
}

.history-date-group {
  margin-bottom: 20px;
}

.history-date {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  padding-left: 4px;
}

.history-entry {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 12px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 8px;
  overflow: hidden;
}

.history-entry-info {
  flex: 1;
  min-width: 0;
}

.history-entry-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.history-entry-sets {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.history-entry-delete {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.history-entry-delete:hover {
  color: var(--danger);
}

.history-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.history-empty svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}

.history-empty p {
  font-size: 15px;
}

/* ── Modal ─────────────────────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  width: 100%;
  max-width: 500px;
  max-height: 85vh;
  background: var(--bg-secondary);
  border-radius: 20px 20px 0 0;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: none;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 20px;
}

.modal-footer {
  padding: 16px 20px;
  padding-bottom: calc(16px + var(--safe-bottom));
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ── Exercise History Modal ────────────────────────────────────────────────── */

.ex-history-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.ex-history-item:last-child {
  border-bottom: none;
}

.ex-history-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.ex-history-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.ex-history-summary {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.ex-history-delete {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
  margin-top: 2px;
}

.ex-history-delete:hover {
  color: var(--danger);
}

.ex-history-empty {
  text-align: center;
  padding: 30px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ── Create Exercise Modal ─────────────────────────────────────────────────── */

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group select {
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23a0a0b8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-group select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ── Logout Button ─────────────────────────────────────────────────────────── */

.logout-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 8px;
  -webkit-tap-highlight-color: transparent;
}

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

/* ── Scrollbar ─────────────────────────────────────────────────────────────── */

::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ── Utilities ─────────────────────────────────────────────────────────────── */

.hidden {
  display: none !important;
}

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

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }

/* ── Responsive ────────────────────────────────────────────────────────────── */

@media (min-width: 768px) {
  .modal {
    max-width: 480px;
    border-radius: 20px;
    margin-bottom: 20px;
  }

  .modal-overlay {
    align-items: center;
  }
}