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

:root {
  --bg:           #0d1a0f;
  --bg2:          #111f13;
  --bg3:          #162019;
  --border:       #1f3323;
  --border2:      #2a4030;
  --green:        #4ade80;
  --green2:       #22c55e;
  --green3:       #16a34a;
  --green-dim:    #166534;
  --text:         #e8f0e9;
  --dim:          #a3c4a8;
  --muted:        #5a7a5e;
  --danger:       #f87171;
  --danger-bg:    #1a0a0a;
  --danger-border:#4b1515;
  --success:      #4ade80;
  --success-bg:   #0a1a0d;
  --warning:      #fbbf24;
  --warning-bg:   #1a150a;
  --primary:      #22c55e;
  --primary-dark: #16a34a;
  --primary-light: rgba(74,222,128,.1);
  --sidebar-w:    240px;
  --radius:       6px;
  --shadow:       0 1px 4px rgba(0,0,0,.4);
  --shadow-md:    0 4px 16px rgba(0,0,0,.5);
}

body {
  font-family: 'Courier New', Courier, monospace;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* ===== Auth Page ===== */
.auth-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: var(--bg);
  position: relative; overflow: hidden;
}
.auth-page::before {
  content: '';
  position: absolute; top: 0; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse at 50% 0%, rgba(74,222,128,.12) 0%, transparent 65%);
  pointer-events: none;
}
.auth-page::after {
  content: '';
  position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 1px; height: 200px;
  background: linear-gradient(to bottom, rgba(74,222,128,.7), transparent);
  filter: blur(.5px);
}
.auth-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: var(--radius);
  width: 100%; max-width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
  position: relative; z-index: 1;
}
.auth-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 2rem; }
.auth-logo h1 {
  font-size: 1.2rem; font-weight: 700;
  color: var(--green);
  text-shadow: 0 0 12px rgba(74,222,128,.4);
  letter-spacing: .06em;
}

/* ===== Layout ===== */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w);
  background: var(--bg2); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 100;
}
.sidebar-header {
  display: flex; align-items: center; gap: 10px;
  padding: 1.25rem 1rem; border-bottom: 1px solid var(--border);
  font-weight: 700; font-size: .95rem;
  color: var(--green);
  text-shadow: 0 0 10px rgba(74,222,128,.4);
  letter-spacing: .05em;
}
.nav-list { list-style: none; padding: .5rem; flex: 1; }
.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: .6rem .85rem; border-radius: 4px;
  color: var(--dim); text-decoration: none; font-weight: 500;
  transition: background .15s, color .15s;
}
.nav-link:hover { background: var(--bg3); color: var(--text); }
.nav-link.active { background: var(--primary-light); color: var(--green); }
.sidebar-footer {
  padding: 1rem; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.username-badge {
  font-weight: 600; font-size: .82rem; color: var(--dim);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.main-content { margin-left: var(--sidebar-w); padding: 2rem; min-height: 100vh; }

/* ===== Pages ===== */
.page { display: none; }
.page.active { display: block; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.page-header h2 { font-size: 1.3rem; font-weight: 700; color: var(--text); }
.page-subtitle { font-size: .82rem; color: var(--muted); margin-top: .2rem; }

/* ===== Card ===== */
.card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1rem;
  box-shadow: var(--shadow);
}
.card h3 { font-size: .95rem; font-weight: 600; margin-bottom: 1rem; color: var(--text); }

/* ===== Forms ===== */
.form-group { display: flex; flex-direction: column; gap: 4px; margin-bottom: 1rem; }
.form-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.form-row .form-group { flex: 1 1 160px; }
label { font-size: .78rem; font-weight: 600; color: var(--dim); letter-spacing: .03em; }
input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="datetime-local"],
select {
  border: 1px solid var(--border2); border-radius: 4px;
  padding: .55rem .75rem; font-size: .88rem;
  background: var(--bg3); color: var(--text);
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s; width: 100%;
}
input:focus, select:focus {
  outline: none; border-color: var(--green3);
  box-shadow: 0 0 0 3px rgba(74,222,128,.12);
}
input::placeholder { color: var(--muted); }
.form-actions { display: flex; gap: .75rem; margin-top: .5rem; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: .5rem 1.1rem; border-radius: 4px; border: none;
  font-size: .85rem; font-weight: 700; cursor: pointer;
  transition: all .15s; text-decoration: none; font-family: inherit;
  letter-spacing: .03em;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--green3); color: #0d1a0f; border: 1px solid var(--green2); }
.btn-primary:hover { background: var(--green2); box-shadow: 0 0 12px rgba(74,222,128,.3); }
.btn-secondary {
  background: var(--bg3); color: var(--dim);
  border: 1px solid var(--border2);
}
.btn-secondary:hover { background: var(--border); color: var(--text); }
.btn-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }
.btn-danger:hover { background: #2a1010; }
.btn-full { width: 100%; justify-content: center; }
.btn-logout {
  background: none; color: var(--muted); border: 1px solid var(--border);
  font-size: .78rem; padding: .35rem .7rem;
}
.btn-logout:hover { background: var(--bg3); color: var(--dim); }
.btn-sm { padding: .28rem .6rem; font-size: .76rem; }
.btn-icon {
  padding: .4rem; border-radius: 4px;
  background: var(--bg3); border: 1px solid var(--border2);
  cursor: pointer; line-height: 1; color: var(--dim);
}
.btn-icon:hover { background: var(--border); color: var(--text); }

/* ===== Alerts ===== */
.alert { padding: .75rem 1rem; border-radius: 4px; font-size: .85rem; margin-top: .75rem; }
.alert-error  { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }
.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid var(--green-dim); }
.info-box {
  background: rgba(74,222,128,.06); border: 1px solid var(--green-dim);
  border-radius: 4px; padding: .85rem 1rem; margin-bottom: 1rem;
  font-size: .83rem; line-height: 1.7; color: var(--dim);
}
.info-box code {
  background: var(--bg); padding: .1rem .4rem; border-radius: 3px;
  font-family: monospace; font-size: .83rem; color: var(--green);
}

/* ===== Peers Grid ===== */
.peers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.peer-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: border-color .2s, box-shadow .2s; overflow: hidden;
}
.peer-card:hover { border-color: var(--border2); box-shadow: var(--shadow-md); }
.peer-card-expired { border-color: var(--danger-border); opacity: .8; }
.peer-card-header { display: flex; align-items: center; gap: .75rem; padding: 1.1rem 1.25rem .75rem; }
.peer-card-icon { font-size: 1.6rem; flex-shrink: 0; }
.peer-card-info { flex: 1; min-width: 0; }
.peer-name { font-weight: 700; font-size: .95rem; color: var(--text); }
.peer-ip { font-size: .78rem; color: var(--muted); font-family: monospace; }
.peer-card-body {
  padding: .75rem 1.25rem;
  border-top: 1px solid var(--border); margin-top: .25rem;
}
.peer-meta-row { display: flex; justify-content: space-between; font-size: .78rem; padding: .2rem 0; }
.peer-meta-label { color: var(--muted); }
.peer-meta-value { font-weight: 500; color: var(--dim); }
.peer-card-footer {
  display: flex; gap: .5rem; padding: .75rem 1.25rem 1rem;
  flex-wrap: wrap; border-top: 1px solid var(--border);
}

/* ===== Badge ===== */
.badge {
  display: inline-flex; align-items: center; padding: .18rem .55rem;
  border-radius: 3px; font-size: .7rem; font-weight: 700;
  letter-spacing: .04em;
}
.badge-active   { background: rgba(74,222,128,.1); color: var(--green2); border: 1px solid var(--green-dim); }
.badge-expired  { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }
.badge-unlimited { background: rgba(74,222,128,.06); color: var(--muted); border: 1px solid var(--border2); }
.badge-settled  { background: rgba(74,222,128,.1); color: var(--green2); border: 1px solid var(--green-dim); }
.badge-new      { background: rgba(251,191,36,.08); color: var(--warning); border: 1px solid #3a2f10; }
.badge-processing { background: rgba(96,165,250,.08); color: #60a5fa; border: 1px solid #1a2a3a; }
.badge-settling { background: rgba(96,165,250,.08); color: #60a5fa; border: 1px solid #1a2a3a; }
.badge-invalid  { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }

/* ===== Loading / Empty ===== */
.loading-state { display: flex; justify-content: center; padding: 3rem; }
.empty-state { text-align: center; padding: 3.5rem 1rem; color: var(--muted); }
.empty-icon { font-size: 2.5rem; margin-bottom: .75rem; }
.empty-title { font-size: .95rem; font-weight: 600; color: var(--dim); margin-bottom: .4rem; }
.empty-desc { font-size: .85rem; }

/* ===== User Avatar ===== */
.user-info { display: flex; align-items: center; gap: .5rem; }
.user-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--green3); color: #0d1a0f;
  font-size: .75rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

/* ===== Tabs ===== */
.tabs { display: flex; gap: .25rem; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; }
.tab-btn {
  background: none; border: none; padding: .6rem 1rem;
  font-size: .85rem; font-weight: 600; color: var(--muted);
  cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -1px; transition: color .15s, border-color .15s;
  font-family: inherit;
}
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ===== Table ===== */
.table-wrap {
  overflow-x: auto; background: var(--bg2);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
table { width: 100%; border-collapse: collapse; }
th, td {
  padding: .7rem 1rem; text-align: left;
  border-bottom: 1px solid var(--border); font-size: .83rem;
}
th { background: var(--bg3); font-weight: 700; color: var(--dim); letter-spacing: .03em; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg3); }
td code { font-family: monospace; color: var(--green2); font-size: .82rem; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; backdrop-filter: blur(4px);
}
.modal {
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--radius); width: 100%; max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,.7);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 1.4rem; border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: .95rem; font-weight: 700; color: var(--text); }
.modal-close {
  background: none; border: none; font-size: 1.4rem;
  cursor: pointer; color: var(--muted); line-height: 1; padding: 0 .2rem;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.4rem; }
.center { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.qr-label { font-weight: 600; font-size: .9rem; color: var(--dim); }
.text-muted { color: var(--muted); font-size: .83rem; }

/* ===== Plans Grid ===== */
.plans-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.25rem; margin-bottom: 1rem; }
.plan-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; text-align: center;
  cursor: pointer; transition: border-color .2s, box-shadow .2s;
  position: relative;
}
.plan-card:hover { border-color: var(--green3); box-shadow: 0 0 20px rgba(74,222,128,.08); }
.plan-card.featured { border-color: var(--green2); box-shadow: 0 0 24px rgba(74,222,128,.12); }
.plan-badge-popular {
  position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--green3); color: #0d1a0f;
  font-size: .65rem; font-weight: 700; letter-spacing: .08em;
  padding: .2rem .7rem; border-radius: 3px; white-space: nowrap;
}
.plan-name { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; color: var(--text); }
.plan-desc { font-size: .8rem; color: var(--muted); margin-bottom: 1.25rem; }
.plan-price { margin-bottom: .25rem; }
.plan-price-amount { font-size: 1.9rem; font-weight: 700; color: var(--green); text-shadow: 0 0 10px rgba(74,222,128,.35); }
.plan-price-unit { font-size: .8rem; color: var(--muted); }
.plan-duration { font-size: .78rem; color: var(--muted); margin-bottom: 1.25rem; }
.plan-summary { background: var(--bg3); border-radius: 4px; padding: 1rem; margin-bottom: .5rem; border: 1px solid var(--border); }
.plan-summary-row { display: flex; justify-content: space-between; align-items: center; padding: .4rem 0; font-size: .88rem; }
.plan-summary-row:not(:last-child) { border-bottom: 1px solid var(--border); }
.plan-summary-row strong { font-weight: 700; color: var(--text); }

/* ===== Subscription Banner ===== */
.subscription-card {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.25rem; border-radius: var(--radius);
  margin-bottom: 1.5rem; border: 1px solid;
}
.subscription-active { background: rgba(74,222,128,.06); border-color: var(--green-dim); }
.subscription-inactive { background: rgba(251,191,36,.06); border-color: #3a2f10; }
.subscription-icon { font-size: 1.2rem; flex-shrink: 0; }
.subscription-body { flex: 1; min-width: 0; }
.subscription-title { font-weight: 700; font-size: .9rem; color: var(--text); }
.subscription-meta { font-size: .78rem; color: var(--muted); margin-top: .15rem; }

/* ===== Spinner ===== */
.spinner {
  width: 36px; height: 36px;
  border: 2px solid var(--border2); border-top-color: var(--green2);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 1rem; }
}