/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #f59e0b;
  --danger: #dc2626;
  --success: #16a34a;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== NAV ===== */
.nav {
  background: var(--primary);
  color: #fff;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.nav-brand { font-size: 1.2rem; font-weight: 700; color: #fff; text-decoration: none; letter-spacing: .5px; }
.nav-links { display: flex; gap: 1rem; align-items: center; }
.nav-links a { color: rgba(255,255,255,.85); text-decoration: none; font-size: .9rem; padding: .3rem .6rem; border-radius: 6px; transition: background .2s; }
.nav-links a:hover { background: rgba(255,255,255,.15); color: #fff; }
.nav-links a.active { background: rgba(255,255,255,.2); color: #fff; }

/* ===== LAYOUT ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 2rem 1.25rem; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.75rem; flex-wrap: wrap; gap: .75rem; }
.page-title { font-size: 1.75rem; font-weight: 700; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem 1.1rem; border-radius: 8px; font-size: .9rem; font-weight: 600;
  cursor: pointer; border: none; text-decoration: none; transition: all .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { filter: brightness(1.1); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(1.1); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: .3rem .75rem; font-size: .8rem; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { filter: brightness(1.1); }

/* ===== CARDS ===== */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  border: 1px solid var(--border);
}
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }

/* ===== FORMS ===== */
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-weight: 600; margin-bottom: .4rem; font-size: .9rem; }
.form-control {
  width: 100%; padding: .6rem .85rem; border: 1.5px solid var(--border);
  border-radius: 8px; font-size: .95rem; background: #fff; color: var(--text);
  transition: border-color .2s;
}
.form-control:focus { outline: none; border-color: var(--primary); }
textarea.form-control { resize: vertical; min-height: 90px; }
.form-hint { font-size: .8rem; color: var(--text-muted); margin-top: .25rem; }
.errorlist { list-style: none; color: var(--danger); font-size: .85rem; margin-top: .25rem; }

/* ===== BADGES ===== */
.badge {
  display: inline-block; padding: .2rem .6rem; border-radius: 999px;
  font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .5px;
}
.badge-glutes { background: #fce7f3; color: #9d174d; }
.badge-legs { background: #ede9fe; color: #5b21b6; }
.badge-back { background: #d1fae5; color: #065f46; }
.badge-chest { background: #fee2e2; color: #991b1b; }
.badge-shoulders { background: #e0f2fe; color: #0c4a6e; }
.badge-arms { background: #fef3c7; color: #92400e; }
.badge-core { background: #f0fdf4; color: #166534; }
.badge-cardio { background: #fff7ed; color: #9a3412; }
.badge-full_body { background: #f1f5f9; color: #334155; }

/* ===== ALERTS ===== */
.alert { padding: .9rem 1.1rem; border-radius: 8px; margin-bottom: 1rem; font-size: .9rem; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }

/* ===== REMINDER BANNERS ===== */
.banner { padding: .85rem 1.25rem; border-radius: 8px; margin-bottom: .75rem; font-size: .9rem; font-weight: 500; }
.banner-warning { background: #fefce8; color: #92400e; border: 1px solid #fde047; }
.banner-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }

/* ===== EMPTY STATE ===== */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }
.empty-state p { margin-bottom: 1rem; }

/* ===== DETAIL SECTION ===== */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.detail-label { font-size: .8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: .25rem; }
.detail-value { font-size: .95rem; }

/* ===== LOGIN ===== */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--primary); }
.login-card { background: #fff; border-radius: 16px; padding: 2.5rem 2rem; width: 100%; max-width: 380px; box-shadow: 0 8px 32px rgba(0,0,0,.18); }
.login-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.75rem; text-align: center; }

/* ===== HAMBURGER NAV ===== */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
  z-index: 200;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  .nav-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--primary);
    flex-direction: column;
    padding: .75rem 1rem 1rem;
    gap: .25rem;
    box-shadow: 0 4px 12px rgba(0,0,0,.2);
    z-index: 150;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .65rem .75rem; border-radius: 8px; font-size: .95rem; }
  .nav-links a span { display: inline; }
  .nav-links button { padding: .65rem .75rem; text-align: left; width: 100%; border-radius: 8px; font-size: .95rem; }

  .detail-grid { grid-template-columns: 1fr; }
  .page-title { font-size: 1.35rem; }
  .card-grid { grid-template-columns: 1fr; }
  .container { padding: 1.25rem .9rem; }

  /* Large tap targets for log workout */
  .btn { min-height: 44px; }
  input.form-control, textarea.form-control, select.form-control { min-height: 44px; font-size: 1rem; }
}

@media (max-width: 640px) {
  .detail-grid { grid-template-columns: 1fr; }
}