/* ============================================================
   TrackIt! v2 — Global Stylesheet
   Design System: Modernes Dark-Theme mit Teal-Akzenten
   ============================================================ */

:root {
  --bg-base:        #0d1117;
  --bg-surface:     #161b22;
  --bg-card:        #1c2433;
  --bg-card-hover:  #21293a;
  --bg-input:       #0d1117;
  --border:         #30363d;
  --border-focus:   #58a6ff;

  --accent:         #14b8a6;   /* Teal-500 */
  --accent-light:   #2dd4bf;
  --accent-dark:    #0d9488;
  --accent-bg:      rgba(20,184,166,0.12);

  --blue:           #58a6ff;
  --purple:         #a78bfa;
  --orange:         #fb923c;
  --red:            #f87171;
  --green:          #34d399;
  --yellow:         #fbbf24;

  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #484f58;

  --radius-sm:      6px;
  --radius:         12px;
  --radius-lg:      18px;
  --radius-xl:      24px;
  --radius-full:    9999px;

  --shadow-sm:      0 1px 3px rgba(0,0,0,0.4);
  --shadow:         0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg:      0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow:    0 0 24px rgba(20,184,166,0.25);

  --font:           'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:      'JetBrains Mono', 'Fira Code', monospace;

  --transition:     0.18s ease;
  --nav-h:          64px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent), var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-sm   { font-size: 0.875rem; }
.text-xs   { font-size: 0.75rem; }
.text-muted { color: var(--text-secondary); }

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
}

.navbar-inner {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-brand .brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), var(--blue));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  flex: 1;
}

.navbar-nav a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.navbar-nav a.active { color: var(--accent); }

.navbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.navbar-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.4rem;
  margin-left: auto;
}

/* User Avatar Chip */
.user-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem 0.3rem 0.3rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
}

.user-chip:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.user-chip .avatar-sm {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  line-height: 1;
}

/* Page wrapper */
.page-wrapper {
  padding-top: var(--nav-h);
  min-height: 100vh;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-sm {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  color: #000;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(20,184,166,0.35);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-danger {
  background: transparent;
  color: var(--red);
  border-color: var(--red);
}
.btn-danger:hover {
  background: rgba(248,113,113,0.12);
}

.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.8rem; }
.btn-lg { padding: 0.8rem 1.75rem; font-size: 1rem; border-radius: var(--radius); }
.btn-xl { padding: 1rem 2rem; font-size: 1.05rem; border-radius: var(--radius); }
.btn-block { width: 100%; }

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
}

.card:hover {
  border-color: rgba(20,184,166,0.3);
}

.card-hover:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.card-glow {
  box-shadow: var(--shadow-glow);
  border-color: rgba(20,184,166,0.4);
}

/* ============================================================
   FORMS
   ============================================================ */
.form-group { margin-bottom: 1.25rem; }

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-control {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20,184,166,0.15);
}

.form-control::placeholder { color: var(--text-muted); }

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.form-error {
  font-size: 0.8rem;
  color: var(--red);
  margin-top: 0.35rem;
}

/* ============================================================
   BADGES & TAGS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
}

.badge-accent { background: var(--accent-bg); color: var(--accent); border: 1px solid rgba(20,184,166,0.25); }
.badge-blue   { background: rgba(88,166,255,0.12); color: var(--blue); border: 1px solid rgba(88,166,255,0.25); }
.badge-purple { background: rgba(167,139,250,0.12); color: var(--purple); border: 1px solid rgba(167,139,250,0.25); }
.badge-orange { background: rgba(251,146,60,0.12); color: var(--orange); border: 1px solid rgba(251,146,60,0.25); }
.badge-green  { background: rgba(52,211,153,0.12); color: var(--green); border: 1px solid rgba(52,211,153,0.25); }
.badge-red    { background: rgba(248,113,113,0.12); color: var(--red); border: 1px solid rgba(248,113,113,0.25); }

/* ============================================================
   AVATAR
   ============================================================ */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-bg);
  border: 2px solid var(--accent);
  flex-shrink: 0;
  line-height: 1;
}

.avatar-xs  { width: 28px; height: 28px; font-size: 0.85rem; }
.avatar-sm  { width: 36px; height: 36px; font-size: 1rem; }
.avatar-md  { width: 52px; height: 52px; font-size: 1.5rem; }
.avatar-lg  { width: 72px; height: 72px; font-size: 2rem; }
.avatar-xl  { width: 96px; height: 96px; font-size: 2.5rem; }

/* ============================================================
   STATS GRID
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================================
   TIMELINE / LOG FEED
   ============================================================ */
.timeline { position: relative; padding-left: 2rem; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0.6rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--border) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.6rem;
  top: 0.75rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-base);
  box-shadow: 0 0 8px rgba(20,184,166,0.5);
}

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform 0.2s ease;
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}

.modal-close:hover { color: var(--text-primary); }

/* ============================================================
   TOASTS / NOTIFICATIONS
   ============================================================ */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-width: 360px;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.25s ease;
  font-size: 0.875rem;
}

.toast.toast-success { border-left: 3px solid var(--green); }
.toast.toast-error   { border-left: 3px solid var(--red); }
.toast.toast-info    { border-left: 3px solid var(--blue); }

.toast-icon { font-size: 1rem; flex-shrink: 0; }
.toast-body { flex: 1; }
.toast-title { font-weight: 600; color: var(--text-primary); margin-bottom: 0.1rem; }
.toast-msg   { color: var(--text-secondary); font-size: 0.82rem; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ============================================================
   DIVIDER
   ============================================================ */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

.divider-text {
  text-align: center;
  position: relative;
  margin: 1.5rem 0;
}

.divider-text::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

.divider-text span {
  position: relative;
  background: var(--bg-surface);
  padding: 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-secondary);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

/* ============================================================
   LOADING SPINNER
   ============================================================ */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 4rem;
  color: var(--text-secondary);
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* ============================================================
   SEARCH BAR
   ============================================================ */
.search-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 0.75rem;
  transition: border-color var(--transition);
}

.search-bar:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20,184,166,0.1);
}

.search-bar i { color: var(--text-muted); font-size: 0.875rem; }

.search-bar input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 0.65rem 0;
}

.search-bar input::placeholder { color: var(--text-muted); }

/* ============================================================
   PAGE HERO
   ============================================================ */
.page-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.page-hero h1 { font-size: clamp(1.5rem, 4vw, 2.2rem); }

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.6rem 1rem;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: -1px;
}

.tab-btn:hover  { color: var(--text-primary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ============================================================
   QR CODE CARD
   ============================================================ */
.qr-frame {
  background: #fff;
  border-radius: var(--radius);
  padding: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */
@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .navbar-mobile-toggle { display: block; }

  .navbar-nav.mobile-open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem;
    gap: 0.25rem;
  }

  .container, .container-sm { padding: 0 1rem; }

  .modal { padding: 1.5rem; border-radius: var(--radius-lg); }

  #toast-container { bottom: 1rem; right: 1rem; left: 1rem; max-width: 100%; }
}

@media (max-width: 480px) {
  :root { --nav-h: 56px; }
  .btn-xl { padding: 0.85rem 1.5rem; }
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.d-flex        { display: flex; }
.d-grid        { display: grid; }
.align-center  { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.mt-1  { margin-top: 0.5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mb-1  { margin-bottom: 0.5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.p-2   { padding: 1rem; }
.p-3   { padding: 1.5rem; }
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.fw-bold { font-weight: 700; }
.w-100 { width: 100%; }
.cursor-pointer { cursor: pointer; }
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-2.sm-2 { grid-template-columns: repeat(2, 1fr); }
}