/* ══════════════════════════════════════════
   Meirins Coach — Design system v3
   ══════════════════════════════════════════ */
:root {
  --c-bg:           #0C0C10;
  --c-surface:      #18181F;
  --c-surface2:     #1C1C24;
  --c-card:         rgba(255,255,255,0.04);
  --c-text:         #ffffff;
  --c-text-mid:     rgba(255,255,255,0.65);
  --c-muted:        rgba(255,255,255,0.4);
  --c-subtle:       rgba(255,255,255,0.25);
  --c-border:       rgba(255,255,255,0.08);
  --c-border-md:    rgba(255,255,255,0.12);
  --c-hover:        rgba(255,255,255,0.06);
  --c-accent:       #00B86B;
  --c-accent2:      #00B86B;
  --c-accent-bg:    rgba(0,184,107,0.14);
  --c-accent-bg2:   rgba(0,184,107,0.08);
  --c-accent-bord:  rgba(0,184,107,0.3);
  --c-shadow:       rgba(0,0,0,0.45);
}

.coach-body.light {
  --c-bg:           #FAFAF8;
  --c-surface:      #ffffff;
  --c-surface2:     #f4f4f0;
  --c-card:         #ffffff;
  --c-text:         #0C0C10;
  --c-text-mid:     #3C3C45;
  --c-muted:        #88889A;
  --c-subtle:       #b0b0c0;
  --c-border:       #E4E4EC;
  --c-border-md:    #D0D0DC;
  --c-hover:        rgba(0,184,107,0.06);
  --c-accent:       #009A58;
  --c-accent2:      #00B86B;
  --c-accent-bg:    rgba(0,184,107,0.10);
  --c-accent-bg2:   rgba(0,184,107,0.06);
  --c-accent-bord:  rgba(0,184,107,0.22);
  --c-shadow:       rgba(0,0,0,0.08);
}

/* ── Body ── */
.coach-body {
  background: var(--c-bg);
  min-height: 100vh;
  color: var(--c-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ── Auth screen ── */
.coach-auth {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--c-bg);
  position: relative;
  overflow: hidden;
}
.coach-auth::before {
  content: '';
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,184,107,0.10) 0%, transparent 65%);
  pointer-events: none;
}

.coach-auth-card {
  background: var(--c-surface);
  border-radius: 22px;
  padding: 44px 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 12px 50px var(--c-shadow);
  border: 1px solid var(--c-border);
  position: relative;
}

.coach-back {
  color: var(--c-muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.15s;
}
.coach-back:hover { color: var(--c-text); }

.coach-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 28px;
}
.coach-logo span:first-child { font-size: 28px; }
.coach-brand { font-size: 20px; color: var(--c-text); font-weight: 400; }
.coach-brand strong { color: var(--c-accent); font-weight: 800; }

.auth-tabs {
  display: flex;
  gap: 4px;
  background: var(--c-card);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 24px;
  border: 1px solid var(--c-border);
}
.auth-tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--c-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 9px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.auth-tab.active {
  background: var(--c-accent);
  color: #0C0C10;
}

.auth-form { display: flex; flex-direction: column; gap: 12px; }

.auth-input {
  background: var(--c-card);
  border: 1px solid var(--c-border-md);
  border-radius: 12px;
  padding: 13px 16px;
  color: var(--c-text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
  font-family: inherit;
}
.auth-input:focus { border-color: var(--c-accent); }
.auth-input::placeholder { color: var(--c-muted); }

.auth-btn {
  margin-top: 4px;
  background: var(--c-accent);
  color: #0C0C10;
  border: none;
  border-radius: 50px;
  padding: 14px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
  font-family: inherit;
}
.auth-btn:hover { opacity: 0.88; transform: translateY(-1px); }
.auth-btn:disabled { opacity: 0.55; cursor: default; transform: none; }

.auth-error { color: #ef4444; font-size: 13px; min-height: 18px; margin: 0; }
.hidden { display: none !important; }

/* ── Dashboard layout ── */
#dashboard-screen { display: flex; min-height: 100vh; }

/* ── Sidebar ── */
.coach-sidebar {
  width: 256px;
  background: var(--c-surface);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
  border-right: 1px solid var(--c-border);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 17px;
  color: var(--c-text);
  font-weight: 400;
  margin-bottom: 4px;
}
.sidebar-logo strong { color: var(--c-accent); font-weight: 800; }

.sidebar-email {
  color: var(--c-muted);
  font-size: 11px;
  margin-bottom: 20px;
  letter-spacing: 0.01em;
  word-break: break-all;
}

.sidebar-nav { flex: 1; }

.sidebar-navitem {
  display: block;
  color: var(--c-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 4px;
}
.sidebar-navitem:hover { background: var(--c-hover); color: var(--c-text); }
.sidebar-navitem.active {
  background: var(--c-accent-bg);
  color: var(--c-accent2);
  font-weight: 600;
}

/* Trainer code box */
.sidebar-code-box {
  background: var(--c-accent-bg2);
  border: 1px solid var(--c-accent-bord);
  border-radius: 14px;
  padding: 16px;
  margin-top: 14px;
}
.sidebar-code-label {
  color: var(--c-muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  margin-bottom: 6px;
}
.sidebar-code {
  color: var(--c-accent2);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 3px;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}
.sidebar-code-hint { color: var(--c-muted); font-size: 12px; line-height: 1.5; }

/* Logout & theme */
.sidebar-logout {
  background: none;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  border-radius: 12px;
  padding: 10px;
  cursor: pointer;
  font-size: 13px;
  margin-top: 6px;
  transition: all 0.15s;
  font-family: inherit;
  width: 100%;
}
.sidebar-logout:hover { border-color: var(--c-border-md); color: var(--c-text); }

.sidebar-theme-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 9px 14px;
  font-size: 13px;
  color: var(--c-muted);
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  width: 100%;
}
.sidebar-theme-toggle:hover { border-color: var(--c-border-md); color: var(--c-text); }

.toggle-track {
  width: 36px;
  height: 20px;
  background: var(--c-border-md);
  border-radius: 20px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.coach-body.light .toggle-track { background: var(--c-accent); }
.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.coach-body.light .toggle-thumb { transform: translateX(16px); }

/* ── Main content ── */
.coach-main {
  flex: 1;
  padding: 40px 48px;
  color: var(--c-text);
  background: var(--c-bg);
}

.coach-heading {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 28px;
  color: var(--c-text);
  letter-spacing: -0.02em;
}

.coach-muted { color: var(--c-muted); font-size: 14px; }

.coach-empty {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  padding: 40px;
  max-width: 480px;
}
.coach-empty-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--c-text);
}

/* ── Client cards ── */
.clients-grid { display: flex; flex-direction: column; gap: 10px; max-width: 600px; }

.client-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--c-surface);
  border-radius: 16px;
  padding: 16px 20px;
  border: 1px solid var(--c-border);
  transition: border-color 0.15s;
}
.client-card:hover { border-color: var(--c-border-md); }

.client-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #0C0C10;
  flex-shrink: 0;
}

.client-info { flex: 1; }
.client-name { color: var(--c-text); font-weight: 600; font-size: 15px; margin: 0 0 2px; }
.client-meta { color: var(--c-muted); font-size: 12px; margin: 0; }

.client-badge {
  background: var(--c-accent-bg);
  color: var(--c-accent2);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
}

/* ── Lang button (auth header) ── */
.coach-lang-btn {
  background: transparent;
  border: 1px solid var(--c-subtle);
  color: var(--c-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.coach-lang-btn.active { color: var(--c-accent); border-color: var(--c-accent); background: var(--c-accent-bg); }

/* ── Mobile top bar ── */
.coach-mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  background: var(--c-surface);
  padding: 14px 20px;
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.coach-mobile-brand { color: var(--c-text); font-size: 16px; font-weight: 400; }
.coach-mobile-brand strong { color: var(--c-accent); font-weight: 800; }
.coach-mobile-menu-btn {
  background: none;
  border: 1px solid var(--c-border-md);
  color: var(--c-text);
  border-radius: 9px;
  padding: 6px 12px;
  font-size: 18px;
  cursor: pointer;
  font-family: inherit;
}
.coach-mobile-nav {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding: 12px 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: sticky;
  top: 53px;
  z-index: 49;
}
.coach-mobile-nav .sidebar-navitem { margin-bottom: 0; }

@media (max-width: 700px) {
  .coach-mobile-header { display: flex; }
  #dashboard-screen { flex-direction: column; }
  .coach-sidebar { display: none; }
  .coach-main { padding: 20px 16px; }
}