/* ═══════════════════════════════════════════════════════════
   NEXUS NUTRITION — Design System v2 — Light Mode
   ═══════════════════════════════════════════════════════════ */

/* ── RESET ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ── TOKENS ─────────────────────────────────────────────────── */
:root {
  /* Surfaces */
  --bg-primary:    #F8F9FA;
  --bg-secondary:  #FFFFFF;
  --bg-tertiary:   #F1F3F5;
  --border:        rgba(0,0,0,0.07);
  --border-strong: rgba(0,0,0,0.13);

  /* Texte */
  --text-primary:   #0A0A0F;
  --text-secondary: #6B7280;
  --text-tertiary:  #9CA3AF;

  /* Accent */
  --accent:       #6C63FF;
  --accent-light: #EEF2FF;
  --accent-glow:  rgba(108,99,255,0.18);

  /* Macros */
  --protein: #FF6B6B;
  --carbs:   #FFB347;
  --fat:     #4ECDC4;
  --water:   #45B7D1;

  /* Système */
  --success: #34C759;
  --warning: #FF9F0A;
  --danger:  #FF453A;

  /* Spacing */
  --xs: 4px; --sm: 8px; --md: 16px; --lg: 24px; --xl: 40px;

  /* Radius */
  --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px; --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.07), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.09), 0 2px 8px rgba(0,0,0,0.05);

  /* Sidebar */
  --sidebar-w: 220px;
}

/* ── BASE ────────────────────────────────────────────────────── */
html, body {
  height: 100%;
  font-family: -apple-system, "Inter", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-primary);
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ── LAYOUT ──────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ── SIDEBAR ─────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: #FFFFFF;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 12px;
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
}

.sidebar-logo {
  width: 40px; height: 40px;
  background: var(--accent);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; color: #fff;
  margin: 0 0 28px 8px;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all .15s ease;
  cursor: pointer;
  margin-bottom: 2px;
}
.nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.nav-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-bottom {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 12px;
}
.sidebar-bottom span {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
}
.sidebar-bottom a {
  font-size: 13px;
  color: var(--danger);
  font-weight: 500;
  cursor: pointer;
}
.sidebar-bottom a:hover { text-decoration: underline; }

/* ── MAIN CONTENT ────────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  background: var(--bg-primary);
  overflow-x: hidden;
  padding: 32px;
}

/* ── CARDS ───────────────────────────────────────────────────── */
.card {
  background: var(--bg-secondary);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card-elevated {
  box-shadow: var(--shadow-md);
}

/* ── BOUTONS ─────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--r-md);
  cursor: pointer;
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: all .15s ease;
  white-space: nowrap;
}
.btn-primary:hover {
  background: #5a52e0;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all .15s ease;
}
.btn-secondary:hover {
  background: var(--border);
  transform: translateY(-1px);
}

/* ── FORMULAIRES ─────────────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--bg-primary);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-md);
  font-size: 15px;
  color: var(--text-primary);
  transition: border-color .15s, box-shadow .15s;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: #fff;
}
.form-input::placeholder { color: var(--text-tertiary); }

select.form-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239CA3AF' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}

/* ── BADGES ──────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--r-full);
  font-size: 12px;
  font-weight: 600;
}
.badge-accent  { background: var(--accent-light); color: var(--accent); }
.badge-success { background: rgba(52,199,89,.1);  color: var(--success); }
.badge-warning { background: rgba(255,159,10,.1); color: var(--warning); }
.badge-danger  { background: rgba(255,69,58,.1);  color: var(--danger); }

/* ── MACRO BARS ──────────────────────────────────────────────── */
.macro-bar-track {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--r-full);
  overflow: hidden;
  margin-top: 6px;
}
.macro-bar-fill {
  height: 100%;
  border-radius: var(--r-full);
  transition: width .6s cubic-bezier(.34,1.56,.64,1);
}

/* ── STAT TILES ──────────────────────────────────────────────── */
.stat-tile {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 20px;
  text-align: center;
}
.stat-tile .stat-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}
.stat-tile .stat-value {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--text-primary);
}
.stat-tile .stat-unit {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── PAGE HEADER ─────────────────────────────────────────────── */
.page-header {
  padding: 32px 32px 0;
  margin-bottom: 28px;
}
.page-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text-primary);
}
.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── WELCOME (Sprint 1 legacy) ───────────────────────────────── */
.welcome-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 40px;
  box-shadow: var(--shadow-md);
}
.welcome-card h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.welcome-card p {
  color: var(--text-secondary);
  margin-bottom: 4px;
}

/* ── DIVIDER ─────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

/* ── SCROLLBAR ───────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── MOBILE ──────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar { display: none; }

  .main-content {
    margin-left: 0 !important;
    padding: calc(env(safe-area-inset-top) + 72px) 16px calc(80px + env(safe-area-inset-bottom)) 16px !important;
  }

  /* Grilles responsive */
  .grid-4 { grid-template-columns: 1fr 1fr !important; gap: 10px !important; }
  .grid-3 { grid-template-columns: 1fr !important; }
  .grid-2 { grid-template-columns: 1fr !important; }

  /* Cards padding réduit sur mobile */
  .card { border-radius: 16px; }

  /* Inputs plus grands sur mobile */
  .form-input { height: 48px; font-size: 16px; }
  .btn-primary { height: 52px; font-size: 16px; border-radius: 14px; }

  /* Tab bar iOS */
  .tab-bar {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 8px 4px calc(8px + env(safe-area-inset-bottom));
    z-index: 200;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
  }
  .tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    font-size: 10px;
    font-weight: 500;
    color: var(--text-tertiary);
    padding: 4px 2px;
    transition: color .15s;
    text-decoration: none;
    min-height: 44px;
    justify-content: center;
  }
  .tab-item.active { color: var(--accent); }
  .tab-item.active .tab-icon { transform: scale(1.1); }
  .tab-icon { font-size: 22px; line-height: 1; transition: transform .15s; }
}
@media (min-width: 769px) {
  .tab-bar { display: none; }
  .mobile-header { display: none; }
  .chat-hamburger { display: none; }
}

/* ── LOGIN PAGE ──────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}
.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}
.login-logo {
  width: 56px; height: 56px;
  background: var(--accent);
  border-radius: var(--r-lg);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800; color: #fff;
  margin: 0 auto 24px;
  box-shadow: 0 8px 24px var(--accent-glow);
}
.login-title {
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.login-subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.login-error {
  background: rgba(255,69,58,.08);
  border: 1px solid rgba(255,69,58,.2);
  color: var(--danger);
  border-radius: var(--r-md);
  padding: 12px 16px;
  font-size: 14px;
  margin-bottom: 20px;
}


/* ============================================================
   MENU HAMBURGER MOBILE — Sprint 5.5
   ============================================================ */
.mobile-header { display: none; }
.hamburger-btn { display: none; }
.menu-overlay { display: none; }
.menu-panel { display: none; }

@media (max-width: 768px) {
  /* Barre header fixe : hamburger + titre */
  .mobile-header {
    display: flex;
    align-items: center;
    gap: 12px;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 56px;
    padding: env(safe-area-inset-top) 16px 0 12px;
    box-sizing: content-box;
    background: rgba(248,249,250,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 250;
  }
  .mobile-header-title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    padding: 10px;
    border: none;
    border-radius: 10px;
    background: var(--bg-secondary);
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    cursor: pointer;
  }
  /* Headers internes des pages masques en mobile (titre dans la barre) */
  .page-header { display: none !important; }
  .hamburger-btn span {
    display: block;
    height: 2.5px;
    width: 100%;
    background: var(--text-primary);
    border-radius: 2px;
  }

  /* Overlay sombre */
  .menu-overlay {
    display: block;
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s ease;
    z-index: 300;
  }
  .menu-overlay.open {
    opacity: 1;
    pointer-events: auto;
  }

  /* Panneau coulissant gauche -> droite */
  .menu-panel {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 78%;
    max-width: 320px;
    background: var(--bg-secondary);
    box-shadow: 4px 0 30px rgba(0,0,0,0.18);
    transform: translateX(-100%);
    transition: transform .28s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 310;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .menu-panel.open {
    transform: translateX(0);
  }

  .menu-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px;
    border-bottom: 1px solid var(--border);
  }
  .menu-panel-logo {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 19px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .menu-close {
    border: none;
    background: transparent;
    font-size: 30px;
    line-height: 1;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0 6px;
  }

  .menu-links {
    flex: 1;
    overflow-y: auto;
    padding: 12px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .menu-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 13px 14px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background .15s, color .15s;
  }
  .menu-link:active {
    background: var(--bg-tertiary);
  }
  .menu-link.active {
    background: var(--accent-light);
    color: var(--accent);
  }
  .menu-link-icon {
    font-size: 20px;
    width: 24px;
    text-align: center;
  }

  .menu-panel-bottom {
    border-top: 1px solid var(--border);
    padding: 16px 18px;
  }
  .menu-panel-email {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    word-break: break-all;
  }
  .menu-logout {
    font-size: 14px;
    font-weight: 600;
    color: var(--danger);
    text-decoration: none;
  }

  /* --- Cas particulier : page chat plein ecran --- */
  body:has(.chat-layout) .mobile-header { display: none; }
  .chat-layout { padding: 0 !important; height: 100dvh !important; }
  .chat-hamburger {
    display: flex !important;
    width: 38px;
    height: 38px;
    padding: 9px;
    background: var(--bg-tertiary) !important;
    box-shadow: none !important;
  }
}