/* ===========================================================================
   i8z — design system
   =========================================================================== */
:root {
  --bg:           #f1f5f9;
  --surface:      #ffffff;
  --surface-alt:  #f8fafc;
  --text:         #0f172a;
  --muted:        #64748b;
  --border:       #e2e8f0;
  --primary:      #4f46e5;
  --primary-hover:#4338ca;
  --primary-soft: #eef2ff;
  --success:      #16a34a;
  --success-soft: #dcfce7;
  --danger:       #dc2626;
  --danger-soft:  #fee2e2;
  --warning:      #d97706;
  --radius:       12px;
  --radius-sm:    8px;
  --shadow:       0 1px 3px rgba(15,23,42,.08), 0 1px 2px rgba(15,23,42,.04);
  --shadow-lg:    0 10px 25px rgba(15,23,42,.12);
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 1.6rem; margin: 0; }
h2 { font-size: 1.15rem; margin: 0; }
h3 { font-size: 1rem; margin: 0; }

/* ---- Top bar ------------------------------------------------------------- */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -.02em;
}
.brand:hover { text-decoration: none; }
.brand span { color: var(--primary); }
.topbar nav { display: flex; gap: 6px; margin-left: 12px; }
.topbar nav a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .95rem;
}
.topbar nav a:hover { background: var(--surface-alt); color: var(--text); text-decoration: none; }
.topbar nav a.active { color: var(--primary); background: var(--primary-soft); }
.topbar .spacer { flex: 1; }
.topbar .user { color: var(--muted); font-size: .9rem; }

/* ---- Layout -------------------------------------------------------------- */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}
.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}
.page-head .subtitle { color: var(--muted); margin: 4px 0 0; font-size: .95rem; }

.section { margin-top: 30px; }
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: .92rem;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--surface-alt); }
.btn-danger { background: var(--surface); color: var(--danger); border-color: var(--danger-soft); }
.btn-danger:hover { background: var(--danger-soft); }
.btn-sm { padding: 6px 10px; font-size: .82rem; }
.btn-block { width: 100%; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---- Summary stat cards -------------------------------------------------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.stat-card .label { color: var(--muted); font-size: .82rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.stat-card .value { font-size: 1.7rem; font-weight: 800; margin-top: 6px; letter-spacing: -.02em; }

/* ---- Links grid ---------------------------------------------------------- */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 16px;
}
.link-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  gap: 14px;
}
.link-card { cursor: pointer; transition: box-shadow .15s, border-color .15s, transform .06s; }
.link-card:hover { border-color: #c7d2fe; box-shadow: 0 6px 18px rgba(79,70,229,.12); }
.link-card:active { transform: translateY(1px); }
.link-card .info { flex: 1; min-width: 0; }
.link-card .view-stats { color: var(--primary); font-size: .78rem; font-weight: 600; margin-left: auto; }
.chart-box { position: relative; height: 240px; }
.chart-box.sm { height: 200px; }
.link-card .short-row { display: flex; align-items: center; gap: 8px; }
.link-card .short-url { font-weight: 700; font-size: 1rem; color: var(--primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.link-card .orig {
  color: var(--muted);
  font-size: .85rem;
  margin: 6px 0 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.link-card .qr { width: 72px; height: 72px; border: 1px solid var(--border); border-radius: var(--radius-sm); flex-shrink: 0; }
.link-card .meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: .78rem;
  font-weight: 600;
}
.badge.clicks { background: var(--primary-soft); color: var(--primary); border-color: transparent; cursor: pointer; }
.badge.clicks:hover { background: #e0e7ff; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 6px;
  width: 30px; height: 30px;
  cursor: pointer;
  font-size: .8rem;
  flex-shrink: 0;
}
.icon-btn:hover { background: var(--surface-alt); color: var(--text); }

/* ---- Tables -------------------------------------------------------------- */
.table { width: 100%; border-collapse: collapse; }
.table th {
  text-align: left;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--muted);
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.table td { padding: 11px 12px; border-bottom: 1px solid var(--border); font-size: .92rem; vertical-align: middle; }
.table tr:last-child td { border-bottom: none; }
.table td.num { font-variant-numeric: tabular-nums; color: var(--muted); }
.truncate { max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Progress / storage -------------------------------------------------- */
.progress { background: var(--border); border-radius: 999px; height: 10px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--success); transition: width .3s; }
.storage-meta { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.storage-meta .free { color: var(--muted); font-size: .85rem; }

/* ---- Empty state --------------------------------------------------------- */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 20px;
}
.empty .big { font-size: 2rem; margin-bottom: 8px; }

/* ---- Forms --------------------------------------------------------------- */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
input[type="text"], input[type="password"], input[type="url"], input[type="file"] {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-family: inherit;
  background: var(--surface);
}
input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

/* ---- Modals -------------------------------------------------------------- */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15,23,42,.5);
  padding: 20px;
  overflow: auto;
}
.modal.open { display: flex; align-items: flex-start; justify-content: center; }
.modal-content {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 460px;
  margin-top: 8vh;
  padding: 24px;
  position: relative;
}
.modal-content h2 { margin-bottom: 16px; }
.modal .close {
  position: absolute;
  top: 14px; right: 16px;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  background: none; border: none;
}
.modal .close:hover { color: var(--text); }
.modal-result { margin-top: 14px; font-size: .9rem; word-break: break-all; }
.modal-result img { margin-top: 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); }

/* ---- Toast --------------------------------------------------------------- */
#toast {
  position: fixed;
  bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: .9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
  z-index: 200;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.error { background: var(--danger); }

/* ---- Charts -------------------------------------------------------------- */
.charts-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.chart-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.chart-card h3 { margin-bottom: 12px; }

/* ---- Auth pages ---------------------------------------------------------- */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
  padding: 32px;
}
.auth-card .brand { display: block; text-align: center; font-size: 1.5rem; margin-bottom: 4px; }
.auth-card .auth-sub { text-align: center; color: var(--muted); margin: 0 0 24px; font-size: .92rem; }
.auth-card .btn { margin-top: 6px; }
.auth-foot { text-align: center; margin: 18px 0 0; font-size: .9rem; color: var(--muted); }

.alert {
  background: var(--danger-soft);
  color: var(--danger);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: .88rem;
  margin-bottom: 16px;
}

/* ---- Footer -------------------------------------------------------------- */
.site-footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 28px 20px; }

/* ---- Homepage hero ------------------------------------------------------- */
.hero { max-width: 680px; margin: 24px auto; text-align: center; padding: 36px; }
.hero h1 { font-size: 2rem; }
.hero .subtitle { font-size: 1rem; }
.hero-form { display: flex; gap: 10px; margin-top: 22px; }
.hero-form input { flex: 1; }
.spinner {
  display: none;
  width: 28px; height: 28px;
  margin: 20px auto 0;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 560px) { .hero-form { flex-direction: column; } }

/* ---- Backward-compat (legacy pages) -------------------------------------- */
.container {
  width: 90%;
  max-width: 600px;
  margin: 48px auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}
.container h1 { margin-bottom: 14px; }
.container input { margin-bottom: 12px; }
.container button { width: 100%; padding: 11px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; font-size: .95rem; }
.container button:hover { background: var(--primary-hover); }
.error { color: var(--danger); }

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width: 560px) {
  .topbar nav a { padding: 8px 9px; }
  .topbar .user { display: none; }
  .link-card { flex-direction: column-reverse; }
  .link-card .qr { width: 64px; height: 64px; }
}