@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;600;700&display=swap');

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

body {
  font-family: 'Oswald', 'Impact', 'Arial Black', sans-serif;
  background: #0d0d0d;
  color: #d4d4d4;
  min-height: 100vh;
}

/* Navigation */
nav {
  background: #000;
  border-bottom: 3px solid #8b0000;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 16px rgba(139,0,0,0.4);
  flex-wrap: wrap;
}

nav .brand {
  color: #cc1a1a;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 16px 0;
  margin-right: auto;
  text-decoration: none;
  text-shadow: 0 0 12px rgba(204,26,26,0.6);
  flex-shrink: 0;
}

nav .brand-logo {
  height: 40px;
  display: block;
}

nav a {
  color: #999;
  text-decoration: none;
  padding: 16px 14px;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s, background 0.2s;
  border-radius: 2px;
}

nav a:hover,
nav a.active {
  color: #cc1a1a;
  background: rgba(139,0,0,0.2);
}

/* Collapsible nav links wrapper */
.nav-links {
  display: flex;
  align-items: center;
}

/* Burger button (hidden on desktop) */
.nav-burger {
  display: none;
  background: transparent;
  border: 1px solid #3a3a3a;
  color: #999;
  font-size: 1.2rem;
  padding: 6px 10px;
  border-radius: 3px;
  cursor: pointer;
  line-height: 1;
  margin-left: 8px;
  transition: color 0.2s, border-color 0.2s;
}

.nav-burger:hover {
  color: #cc1a1a;
  border-color: #8b0000;
}

/* Main layout */
main {
  max-width: 860px;
  margin: 40px auto;
  padding: 0 20px;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: #e0e0e0;
}

h2 {
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

h3 {
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.subtitle {
  color: #777;
  margin-bottom: 28px;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
}

/* Cards */
.card {
  background: #1a1a1a;
  border: 1px solid #2e2e2e;
  border-top: 3px solid #8b0000;
  border-radius: 4px;
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  margin-bottom: 24px;
}

.card h2 {
  color: #cc1a1a;
  margin-bottom: 16px;
}

/* Forms */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #999;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  background: #111;
  color: #d4d4d4;
  border: 1px solid #3a3a3a;
  border-radius: 3px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #8b0000;
  box-shadow: 0 0 0 2px rgba(139,0,0,0.25);
}

.form-group select option {
  background: #1a1a1a;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  flex: 1;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border: none;
  border-radius: 3px;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
}

.btn-secondary {
  background: #2a2a2a;
  color: #cc1a1a;
  border: 1px solid #5a0000;
}

.btn-secondary:hover {
  background: #3a0000;
  color: #ff6666;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: #8b0000;
  color: #fff;
  box-shadow: 0 2px 8px rgba(139,0,0,0.4);
}

.btn-primary:hover {
  background: #a80000;
  box-shadow: 0 4px 14px rgba(139,0,0,0.6);
}

.btn-danger {
  background: #3a0000;
  color: #cc6666;
  border: 1px solid #660000;
  padding: 5px 12px;
  font-size: 0.8rem;
}

.btn-danger:hover {
  background: #5a0000;
  color: #ff9999;
}

/* Stats row */
.stats-row {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  flex: 1;
  background: #1a1a1a;
  border: 1px solid #2e2e2e;
  border-top: 3px solid #8b0000;
  border-radius: 4px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  color: #cc1a1a;
  text-shadow: 0 0 10px rgba(204,26,26,0.4);
}

.stat-card .label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #666;
  margin-top: 6px;
}

/* Table */
.table-scroll {
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

thead th {
  text-align: left;
  padding: 10px 12px;
  background: #111;
  border-bottom: 2px solid #8b0000;
  font-size: 0.75rem;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

tbody tr {
  border-bottom: 1px solid #2a2a2a;
}

tbody tr:last-child {
  border-bottom: none;
}

tbody td {
  padding: 10px 12px;
  color: #bbb;
}

tbody tr:hover {
  background: #222;
}

/* Alert / message */
.alert {
  padding: 12px 16px;
  border-radius: 3px;
  margin-bottom: 18px;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.alert-success {
  background: #1a0505;
  color: #cc6666;
  border: 1px solid #5a0000;
  border-left: 4px solid #8b0000;
}

.alert-info {
  background: #0a0a1a;
  color: #7799cc;
  border: 1px solid #223366;
  border-left: 4px solid #335599;
}

/* Progress bar */
.progress-wrap {
  background: #2a2a2a;
  border-radius: 2px;
  height: 12px;
  overflow: hidden;
  margin-top: 6px;
  border: 1px solid #3a3a3a;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #8b0000, #cc1a1a);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* Hero section on home page */
.hero {
  text-align: center;
  padding: 48px 20px 36px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  text-shadow: 0 0 30px rgba(204,26,26,0.5), 0 2px 4px rgba(0,0,0,0.8);
}

.hero p {
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #777;
  margin: 14px 0 28px;
}

.features {
  display: flex;
  gap: 20px;
  margin-bottom: 36px;
}

.feature-card {
  flex: 1;
  background: #1a1a1a;
  border: 1px solid #2e2e2e;
  border-top: 3px solid #8b0000;
  border-radius: 4px;
  padding: 24px 20px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  transition: border-top-color 0.2s, box-shadow 0.2s;
  text-decoration: none;
  display: block;
  cursor: pointer;
}

.feature-card:hover {
  border-top-color: #cc1a1a;
  box-shadow: 0 6px 24px rgba(139,0,0,0.3);
}

.feature-card .icon {
  margin-bottom: 10px;
}

.feature-card .feature-icon {
  width: 220px;
  height: 220px;
  object-fit: contain;
}

.feature-card h3 {
  color: #cc1a1a;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: #777;
  text-transform: none;
}

.progress-bar-over {
  background: linear-gradient(90deg, #660000, #ff4444) !important;
}

.empty-state {
  text-align: center;
  padding: 32px;
  color: #555;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    order: 10;
    padding: 4px 0 8px;
    border-top: 1px solid #1e1e1e;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    border-radius: 0;
    width: 100%;
  }

  nav {
    padding: 0 16px;
  }

  nav .brand {
    padding: 12px 0;
  }
}

@media (max-width: 600px) {
  .stats-row,
  .features,
  .form-row {
    flex-direction: column;
  }

  main {
    padding: 0 14px;
    margin: 16px auto;
  }

  h1 {
    font-size: 1.4rem;
    margin-bottom: 4px;
  }

  .subtitle {
    font-size: 0.85rem;
    margin-bottom: 16px;
  }

  .card {
    padding: 16px 14px;
    margin-bottom: 16px;
  }

  .card h2 {
    margin-bottom: 12px;
    font-size: 1rem;
  }

  .hero {
    padding: 32px 12px 24px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .feature-card {
    padding: 18px 16px;
  }

  .feature-card .feature-icon {
    width: 200px;
    height: 200px;
  }

  .table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    font-size: 0.82rem;
    min-width: 480px;
  }

  thead th,
  tbody td {
    padding: 8px 8px;
  }
}

/* Login tab buttons */
.tab-row {
  display: flex;
  margin-bottom: 24px;
  border-bottom: 2px solid #2e2e2e;
}

.tab-btn {
  flex: 1;
  padding: 10px 20px;
  background: transparent;
  color: #666;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.tab-btn.active {
  color: #cc1a1a;
  border-bottom-color: #8b0000;
}

.tab-btn:hover:not(.active) {
  color: #999;
}

/* Nav right group: keeps username, logout, and burger on one line */
.nav-right {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* Nav user badge + logout */
.nav-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 14px;
  border-left: 1px solid #3a3a3a;
}

.nav-username {
  color: #888;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 4px 6px;
  border-radius: 2px;
  transition: color 0.2s, background 0.2s;
}

.nav-username:hover {
  color: #cc1a1a;
  background: rgba(139,0,0,0.15);
}

.btn-nav-logout {
  background: transparent;
  color: #555;
  border: 1px solid #3a3a3a;
  padding: 4px 12px;
  font-size: 0.75rem;
  border-radius: 2px;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s, border-color 0.2s;
}

.btn-nav-logout:hover {
  color: #cc1a1a;
  border-color: #8b0000;
}

/* Inline form error message */
.form-error {
  color: #cc6666;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  min-height: 1.2em;
  margin-bottom: 14px;
}

/* Chart card header */
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* Exercise row builder */
.exercise-row {
  margin-bottom: 10px;
}

.exercise-row-fields {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.exercise-row-fields .form-group {
  flex: 1;
  min-width: 90px;
  margin-bottom: 0;
}

.btn-remove-exercise {
  flex-shrink: 0;
  padding: 9px 12px;
  font-size: 0.9rem;
  margin-bottom: 0;
  line-height: 1;
}

/* Workout session history blocks */
.session-block {
  border: 1px solid #2e2e2e;
  border-radius: 3px;
  margin-bottom: 10px;
  overflow: hidden;
}

.session-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: #111;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.session-header:hover {
  background: #1a1a1a;
}

.session-date {
  font-weight: 700;
  color: #cc1a1a;
  font-size: 0.95rem;
  min-width: 80px;
}

.session-meta {
  color: #777;
  font-size: 0.85rem;
  flex: 1;
  letter-spacing: 0.02em;
  text-transform: none;
}

.session-toggle {
  color: #555;
  font-size: 0.75rem;
  margin-left: auto;
}

.session-body {
  display: none;
  padding: 0 16px 16px;
  background: #0f0f0f;
}

.session-body.open {
  display: block;
}

@media (max-width: 600px) {
  .exercise-row-fields {
    flex-direction: column;
    gap: 6px;
  }
  .chart-header {
    flex-direction: column;
    align-items: flex-start;
  }
}