/* ==========================================================
   shared.css – ECG NutriApp  |  nav + global base
   ========================================================== */

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

/* ── CSS variables ─────────────────────────────────────────── */
:root {
  --bg:       #f9fafb;
  --surface:  #ffffff;
  --line:     #e5e7eb;
  --text:     #111827;
  --muted:    #6b7280;
  --hover:    #f3f4f6;
  --accent:   #00A7DE;
  --accent-h: #0090bf;
  --danger:   #ef4444;
  --success:  #22c55e;
  --radius:   12px;
  --nav-h:    52px;
}

/* ── NAV ───────────────────────────────────────────────────── */
.app-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  padding: 0 16px;
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  gap: 4px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
  margin-right: 6px;
}
.nav-logo img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  transition: background .12s, color .12s;
}
.nav-link:hover  { background: var(--hover); color: var(--text); }
.nav-link.active { background: #e0f2fe; color: #0369a1; font-weight: 600; }

/* ── Admin dropdown ──────────────────────────────────────────── */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-trigger {
  cursor: pointer;
  gap: 4px;
  border: none;
  font-family: inherit;
  font-size: inherit;
}
.nav-dropdown-trigger svg {
  transition: transform .15s;
  flex-shrink: 0;
}
.nav-dropdown.open .nav-dropdown-trigger svg { transform: rotate(180deg); }

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 160px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
  padding: 4px;
  z-index: 300;
  flex-direction: column;
  gap: 2px;
}
.nav-dropdown.open .nav-dropdown-menu { display: flex; }

.nav-dropdown-item {
  border-radius: 7px;
  padding: 9px 12px;
  font-size: 14px;
}

/* Mobile admin section */
.nav-mobile-admin-section { padding-top: 2px; }
.nav-mobile-admin-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  padding: 8px 14px 4px;
}
.nav-mobile-link--sub { padding-left: 26px; font-size: 14px; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

/* Avatar + name button */
.nav-user-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px 5px 5px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  background: var(--hover);
  border: 1px solid var(--line);
  transition: all .12s;
  cursor: pointer;
}
.nav-user-btn:hover {
  background: #e0f2fe;
  border-color: rgba(0,167,222,.4);
  color: #0369a1;
}

.nav-avatar {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: .03em;
}

.nav-logout-btn {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: all .12s;
}
.nav-logout-btn:hover { background: var(--hover); color: var(--text); }

.nav-login-btn {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background .12s;
}
.nav-login-btn:hover { background: var(--accent-h); }

/* Hamburger button */
.nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  transition: all .12s;
  color: var(--muted);
  margin-left: auto;
  flex-shrink: 0;
}
.nav-hamburger:hover {
  background: var(--hover);
  border-color: var(--accent);
  color: var(--accent);
}

/* Mobile menu overlay */
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 8px 12px 12px;
  flex-direction: column;
  gap: 3px;
  z-index: 199;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
.nav-mobile-menu.open { display: flex; }

.nav-mobile-link {
  display: flex;
  align-items: center;
  padding: 11px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: background .12s;
}
.nav-mobile-link:hover,
.nav-mobile-link.active { background: #e0f2fe; color: #0369a1; }

.nav-mobile-sep { height: 1px; background: var(--line); margin: 4px 0; }

.nav-mobile-action {
  display: flex;
  align-items: center;
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  text-decoration: none;
  transition: background .12s;
}
.nav-mobile-action:hover { background: var(--hover); color: var(--text); }
.nav-mobile-action--accent { color: var(--accent); font-weight: 600; }

@media (max-width: 640px) {
  .nav-links,
  .nav-right      { display: none !important; }
  .nav-hamburger  { display: flex; }
}

/* ── DARK MODE ─────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #0d1117;   /* darkest — page background          */
    --surface: #161e2e;   /* lighter — cards / panels           */
    --line:    #2a3a52;   /* visible borders                    */
    --text:    #e8edf3;   /* bright primary text                */
    --muted:   #8899b0;   /* secondary / label text             */
    --hover:   #1d2a3f;   /* hover state inside elements        */
  }

  /* Form inputs sit slightly sunken inside cards */
  .field input,
  .field select,
  .field textarea {
    background:   #0d1420;
    border-color: #2a3a52;
    color:        var(--text);
  }
  .field input::placeholder,
  .field textarea::placeholder { color: #4a5a70; }
  .field input:focus,
  .field select:focus,
  .field textarea:focus {
    background: #0d1420;
    border-color: var(--accent);
  }

  .nav-logo img          { filter: invert(1) brightness(1.2); }
  .nav-link.active       { background: rgba(0,167,222,.18); color: var(--accent); }
  .nav-dropdown-menu     { background: #161e2e; border-color: var(--line); box-shadow: 0 8px 24px rgba(0,0,0,.4); }
  .nav-user-btn          { background: #1d2a3f; border-color: var(--line); }
  .nav-user-btn:hover    { background: rgba(0,167,222,.18); border-color: rgba(0,167,222,.4); color: var(--accent); }
  .nav-mobile-menu       { box-shadow: 0 8px 28px rgba(0,0,0,.6); }
  .nav-mobile-link:hover,
  .nav-mobile-link.active { background: rgba(0,167,222,.18); color: var(--accent); }

  /* Cards get a subtle top highlight for depth */
  .card {
    box-shadow: 0 1px 0 rgba(255,255,255,.04) inset;
  }
}

/* ── SHARED PAGE UTILITIES ─────────────────────────────────── */
.page-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 20px;
  color: var(--text);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--text);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 540px) { .form-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 13px; font-weight: 600; color: var(--muted); }

.field input,
.field select {
  height: 42px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  transition: border-color .12s, box-shadow .12s;
  outline: none;
  width: 100%;
}
.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,167,222,.12);
}
.field input:disabled { opacity: .55; cursor: not-allowed; }

.field textarea {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  resize: vertical;
  outline: none;
  width: 100%;
  transition: border-color .12s, box-shadow .12s;
}
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,167,222,.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all .12s;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover:not(:disabled) { background: var(--accent-h); }
.btn--ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
}
.btn--ghost:hover:not(:disabled) { background: var(--hover); color: var(--text); }
.btn--danger {
  background: rgba(239,68,68,.1);
  color: #b91c1c;
  border: 1px solid rgba(239,68,68,.25);
}
.btn--danger:hover:not(:disabled) { background: rgba(239,68,68,.18); }

.form-msg {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
}
.form-msg--success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.form-msg--error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

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