/* ============================================================
   Modern Gas — Login page
   Cyberpunk industrial HUD, dark by default, light optional
   ============================================================ */

:root {
  --blue: #1e9ce8;
  --green: #46c147;
  --accent: #7af1b0;
  --gradient: linear-gradient(135deg, #1e9ce8 0%, #46c147 100%);
  --gradient-soft: linear-gradient(135deg, rgba(30,156,232,0.18), rgba(70,193,71,0.18));
  --radius: 16px;
  --radius-card: 22px;
  --shadow-glow: 0 0 40px rgba(30, 156, 232, 0.25), 0 0 80px rgba(70, 193, 71, 0.18);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg: #050b14;
  --bg-2: #0a1622;
  --surface: rgba(13, 24, 38, 0.62);
  --surface-strong: rgba(13, 24, 38, 0.92);
  --border: rgba(122, 241, 176, 0.18);
  --border-strong: rgba(122, 241, 176, 0.45);
  --text: #eaf4ff;
  --text-dim: #92a8c2;
  --input-bg: rgba(8, 14, 22, 0.7);
  --error: #ff6b8b;
  --ok: #46c147;
}

[data-theme="light"] {
  --bg: #eef4fb;
  --bg-2: #ffffff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --border: rgba(30, 156, 232, 0.22);
  --border-strong: rgba(30, 156, 232, 0.5);
  --text: #0a1622;
  --text-dim: #4d6580;
  --input-bg: rgba(255, 255, 255, 0.92);
  --error: #d62b50;
  --ok: #198a3b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

/* ---------- Animated background ---------- */
.bg {
  position: fixed; inset: 0;
  z-index: 0;
  overflow: hidden;
  background:
    radial-gradient(60% 50% at 20% 20%, rgba(30,156,232,0.22), transparent 60%),
    radial-gradient(60% 50% at 80% 80%, rgba(70,193,71,0.18), transparent 60%),
    var(--bg);
}
.bg-mesh {
  position: absolute; inset: -25%;
  background:
    conic-gradient(from 0deg at 50% 50%,
      rgba(30,156,232,0.18),
      rgba(122,241,176,0.10),
      rgba(70,193,71,0.18),
      rgba(30,156,232,0.10),
      rgba(30,156,232,0.18));
  filter: blur(80px);
  animation: spin 35s linear infinite;
}
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(122,241,176,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122,241,176,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.bg-scanlines {
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(255,255,255,0.025) 0 1px,
    transparent 1px 4px
  );
  mix-blend-mode: overlay;
  pointer-events: none;
}
[data-theme="light"] .bg-scanlines { opacity: 0.4; }
[data-theme="light"] .bg-grid {
  background-image:
    linear-gradient(rgba(30,156,232,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,156,232,0.07) 1px, transparent 1px);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  position: fixed; top: 18px; right: 18px;
  z-index: 10;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  display: grid; place-items: center;
  backdrop-filter: blur(12px);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}
.theme-toggle:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.theme-toggle svg { width: 20px; height: 20px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Auth card ---------- */
.auth-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card {
  width: min(440px, 100%);
  background: var(--surface);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 36px 32px 32px;
  box-shadow: var(--shadow-glow), 0 30px 60px rgba(0,0,0,0.45);
  position: relative;
  animation: cardIn 0.7s var(--ease) both;
  /* sci-fi corner cuts */
  clip-path: polygon(
    18px 0, 100% 0,
    100% calc(100% - 18px), calc(100% - 18px) 100%,
    0 100%, 0 18px
  );
}
.auth-card::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--gradient);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0.55;
  pointer-events: none;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-header { text-align: center; margin-bottom: 22px; }
.auth-logo {
  display: block;
  margin: 0 auto;
  width: min(78%, 320px);
  height: auto;
  filter: drop-shadow(0 0 18px rgba(30,156,232,0.45));
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.auth-title {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 28px;
  margin: 12px 0 4px;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.auth-subtitle {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ---------- Tabs ---------- */
.tabs {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 26px 0 22px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
}
.tab {
  position: relative;
  z-index: 1;
  background: transparent;
  border: 0;
  padding: 10px 14px;
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 8px;
  transition: color 0.25s var(--ease);
}
.tab.active { color: #fff; }
[data-theme="light"] .tab.active { color: #fff; }
.tab-indicator {
  position: absolute;
  top: 4px; left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  background: var(--gradient);
  border-radius: 8px;
  transition: transform 0.35s var(--ease);
  box-shadow: 0 6px 18px rgba(30,156,232,0.35);
}
.tabs.is-register .tab-indicator { transform: translateX(100%); }

/* ---------- Forms ---------- */
.auth-form {
  display: none;
  flex-direction: column;
  gap: 14px;
  animation: formIn 0.4s var(--ease);
}
.auth-form.active { display: flex; }
@keyframes formIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.field { display: block; }
.field-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.field-input {
  width: 100%;
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.field-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,156,232,0.18);
}

.form-error {
  min-height: 18px;
  margin: 2px 0 0;
  color: var(--error);
  font-size: 13px;
}

.btn-primary {
  position: relative;
  margin-top: 8px;
  padding: 14px 18px;
  border: 0;
  border-radius: 12px;
  background: var(--gradient);
  color: #fff;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.15s var(--ease), box-shadow 0.2s var(--ease), opacity 0.2s var(--ease);
  box-shadow: 0 10px 30px rgba(30,156,232,0.3);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 14px 38px rgba(30,156,232,0.45);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary.loading .btn-label { opacity: 0; }
.btn-spinner {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  animation: spinner 0.7s linear infinite;
  display: none;
}
.btn-primary.loading .btn-spinner { display: block; }
@keyframes spinner { to { transform: rotate(360deg); } }

/* ---------- Password checklist ---------- */
.pw-checklist {
  list-style: none;
  margin: 0; padding: 10px 12px;
  background: var(--input-bg);
  border: 1px dashed var(--border);
  border-radius: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 14px;
  font-size: 12.5px;
  color: var(--text-dim);
}
.pw-checklist li {
  display: flex; align-items: center; gap: 8px;
  transition: color 0.25s var(--ease);
}
.pw-checklist li .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  opacity: 0.55;
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.pw-checklist li.ok { color: var(--ok); }
.pw-checklist li.ok .dot {
  background: var(--ok);
  opacity: 1;
  box-shadow: 0 0 8px rgba(70,193,71,0.6);
}

@media (max-width: 460px) {
  .auth-card { padding: 28px 22px 24px; }
  .pw-checklist { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .bg-mesh, .auth-logo, .btn-spinner { animation: none !important; }
  .auth-card { animation: none !important; }
}