/* ============================================================
   APPLE THEME — inspired by apple.com
   ============================================================ */
:root {
  --bg-primary:    #f5f5f7;
  --bg-secondary:  #ffffff;
  --bg-card:       #ffffff;
  --bg-input:      #ffffff;
  --bg-nav:        rgba(255,255,255,0.85);

  --text-primary:   #1d1d1f;
  --text-secondary: #6e6e73;
  --text-muted:     #a1a1a6;
  --text-inverse:   #ffffff;

  --accent:         #0071e3;
  --accent-hover:   #0077ed;
  --accent-light:   #e8f0fe;
  --success:        #34c759;
  --warning:        #ff9f0a;
  --danger:         #ff3b30;

  --border:         rgba(0,0,0,0.1);
  --border-focus:   #0071e3;
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:      0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg:      0 8px 40px rgba(0,0,0,0.12);

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  24px;
  --radius-pill: 100px;

  --font:         -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "SF Mono", SFMono-Regular, ui-monospace, monospace;
  --font-size:    17px;
  --line-height:  1.6;

  --nav-height: 52px;
  --max-width:  980px;
}

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

body {
  font-family: var(--font);
  font-size: var(--font-size);
  line-height: var(--line-height);
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 22px;
}
.nav-brand { font-size: 18px; font-weight: 600; color: var(--text-primary); text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a { font-size: 14px; color: var(--text-secondary); text-decoration: none; transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-user { font-size: 14px; color: var(--text-secondary); }

/* Page wrapper */
.page { max-width: var(--max-width); margin: 0 auto; padding: 40px 22px 80px; }
.page-sm { max-width: 480px; margin: 0 auto; padding: 60px 22px; }

/* Typography */
h1 { font-size: 48px; font-weight: 700; letter-spacing: -0.5px; line-height: 1.1; margin-bottom: 16px; }
h2 { font-size: 28px; font-weight: 600; letter-spacing: -0.3px; margin-bottom: 12px; }
h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
p  { color: var(--text-secondary); margin-bottom: 16px; }

.headline    { font-size: 56px; font-weight: 700; letter-spacing: -1px; line-height: 1.07; }
.subheadline { font-size: 21px; font-weight: 400; color: var(--text-secondary); margin-top: 8px; }
.eyebrow     { font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
  margin-bottom: 20px;
}
.card-sm { padding: 20px; border-radius: var(--radius-md); }
.card-flush { padding: 0; overflow: hidden; }

/* Section header */
.section-header { margin-bottom: 20px; }
.section-header h2 { font-size: 22px; }

/* Grid */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 700px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  h1 { font-size: 32px; }
  .headline { font-size: 36px; }
}

/* Stat tile */
.stat {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.stat-label { font-size: 13px; color: var(--text-secondary); font-weight: 500; margin-bottom: 6px; letter-spacing: 0.2px; }
.stat-value { font-size: 28px; font-weight: 700; letter-spacing: -0.5px; color: var(--text-primary); }
.stat-unit  { font-size: 14px; font-weight: 500; color: var(--text-secondary); margin-left: 3px; }
.stat-delta { font-size: 13px; margin-top: 4px; }
.stat-delta.up   { color: var(--danger); }
.stat-delta.down { color: var(--success); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-family: var(--font);
  font-size: 15px; font-weight: 500;
  border: none; cursor: pointer;
  text-decoration: none;
  transition: all .2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); transform: scale(1.02); }
.btn-secondary {
  background: rgba(0,0,0,0.06); color: var(--text-primary);
}
.btn-secondary:hover { background: rgba(0,0,0,0.1); }
.btn-lg { padding: 16px 32px; font-size: 17px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-full { width: 100%; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #e0362b; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block; font-size: 14px; font-weight: 500;
  color: var(--text-primary); margin-bottom: 6px;
}
.form-hint { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.form-input, .form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 15px;
  transition: border-color .2s, box-shadow .2s;
  -webkit-appearance: none;
}
.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.15);
}
.form-input::placeholder { color: var(--text-muted); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 480px) { .form-row { grid-template-columns: 1fr; } }

/* Error / success messages */
.alert {
  padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 14px; margin-bottom: 16px;
}
.alert-error   { background: #fff2f2; color: var(--danger); border: 1px solid rgba(255,59,48,.2); }
.alert-success { background: #f0fdf4; color: #1a7a3a; border: 1px solid rgba(52,199,89,.2); }

/* Theme toggle pill */
.theme-picker { display: flex; gap: 8px; flex-wrap: wrap; }
.theme-option {
  padding: 6px 14px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 500;
  border: 1.5px solid var(--border); background: transparent; cursor: pointer;
  color: var(--text-secondary); transition: all .2s;
}
.theme-option.active, .theme-option:hover {
  border-color: var(--accent); color: var(--accent); background: var(--accent-light);
}

/* Data rows (dashboard) */
.data-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0; border-bottom: 1px solid var(--border);
  font-size: 15px;
}
.data-row:last-child { border-bottom: none; }
.data-row .label { color: var(--text-secondary); font-size: 14px; }
.data-row .value { font-weight: 600; color: var(--text-primary); }
.data-row .value.highlight { color: var(--accent); }
.data-row .value.success   { color: var(--success); }
.data-row .value.danger    { color: var(--danger); }

/* Progress bar */
.progress { height: 6px; background: rgba(0,0,0,0.08); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width .3s; }

/* Badge */
.badge {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: var(--radius-pill);
  font-size: 12px; font-weight: 600;
}
.badge-green  { background: rgba(52,199,89,.12);  color: #1a7a3a; }
.badge-blue   { background: rgba(0,113,227,.10);  color: var(--accent); }
.badge-orange { background: rgba(255,159,10,.12); color: #b35a00; }
.badge-red    { background: rgba(255,59,48,.10);  color: var(--danger); }

/* Divider */
.divider { height: 1px; background: var(--border); margin: 24px 0; }

/* Welcome hero */
.hero { text-align: center; padding: 80px 0 60px; }
.hero .headline { background: linear-gradient(135deg, #1d1d1f 0%, #0071e3 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Workout session card */
.session-card {
  background: var(--bg-primary); border-radius: var(--radius-md);
  padding: 20px; margin-bottom: 12px;
}
.session-title { font-weight: 600; font-size: 15px; color: var(--text-primary); }
.session-meta  { font-size: 13px; color: var(--text-secondary); margin-top: 3px; }

/* Totals row */
.totals-row {
  background: var(--accent-light); border-radius: var(--radius-md);
  padding: 14px 16px; margin-top: 10px;
  display: flex; gap: 24px; flex-wrap: wrap;
}
.totals-item { text-align: center; }
.totals-item .tval { font-size: 18px; font-weight: 700; color: var(--accent); }
.totals-item .tlbl { font-size: 11px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }

/* Setup wizard steps */
.wizard { max-width: 560px; margin: 0 auto; }
.wizard-steps { display: flex; justify-content: center; gap: 8px; margin-bottom: 36px; }
.wizard-step-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border); transition: background .2s, transform .2s;
}
.wizard-step-dot.active { background: var(--accent); transform: scale(1.4); }
.wizard-step-dot.done   { background: var(--success); }
.wizard-panel { display: none; }
.wizard-panel.active { display: block; }

/* Calc box (calorie suggestion) */
.calc-box {
  background: var(--bg-primary); border-radius: var(--radius-md);
  padding: 20px; margin: 16px 0;
  border: 1px solid var(--border);
}
.calc-box .big-number { font-size: 48px; font-weight: 700; color: var(--accent); letter-spacing: -1px; }
.calc-box .big-label  { font-size: 14px; color: var(--text-secondary); margin-top: 2px; }
.calc-row { display: flex; justify-content: space-between; font-size: 14px; padding: 4px 0; }
.calc-row span:first-child { color: var(--text-secondary); }
.calc-row span:last-child  { font-weight: 600; }