*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #f2f4fb;
  --surface:  #ffffff;
  --border:   #dde1f5;
  --text:     #1a1c2e;
  --muted:    #52607a;
  --dim:      #98a2bc;
  --accent:   #6c5ce7;
  --accent2:  #5a4dd6;
  --error:    #dc2626;
  --radius:   16px;
}

[data-theme="dark"] {
  --bg:       #11121b;
  --surface:  #181a28;
  --border:   #2b2e47;
  --text:     #ecedf8;
  --muted:    #a7adc9;
  --dim:      #6b7095;
  --accent:   #8c7df3;
  --accent2:  #7a6bf0;
  --error:    #f87171;
}
[data-theme="dark"] .error-msg { background: rgba(239,68,68,0.12); border-color: rgba(239,68,68,0.35); }
[data-theme="dark"] .submit-btn { box-shadow: 0 2px 14px rgba(140,125,243,0.3); }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(108,92,231,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108,92,231,0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.bg-grid::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, rgba(108,92,231,0.08) 0%, transparent 70%);
}

.center {
  position: relative; z-index: 1;
  width: 100%; padding: 20px;
  display: flex; justify-content: center;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px 32px;
  width: 100%; max-width: 420px;
  box-shadow: 0 8px 40px rgba(26,28,60,0.10);
}

.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; }
.brand-icon { font-size: 24px; }
.brand-name { font-family: 'Space Grotesk', sans-serif; font-size: 1.2rem; color: var(--muted); letter-spacing: -0.02em; }
.brand-name strong { color: var(--text); font-weight: 700; }

.card-intro { margin-bottom: 24px; }
.card-title { font-family: 'Space Grotesk', sans-serif; font-size: 1.45rem; font-weight: 700; color: var(--text); letter-spacing: -0.03em; margin-bottom: 4px; }
.card-subtitle { font-size: 0.85rem; color: var(--dim); line-height: 1.5; }

.auth-form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.76rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }

.input-wrap { position: relative; }
.input-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--dim); pointer-events: none; }
.input-wrap input {
  width: 100%; background: var(--bg); border: 1.5px solid var(--border);
  color: var(--text); padding: 11px 14px 11px 38px;
  border-radius: 10px; font-size: 0.9rem; font-family: inherit; outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.input-wrap input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,92,231,0.13); background: var(--surface); }
.input-wrap input::placeholder { color: var(--dim); }

.error-msg { font-size: 0.82rem; color: var(--error); background: #fff5f5; border: 1px solid #fca5a5; border-radius: 8px; min-height: 0; transition: padding 0.15s, max-height 0.15s; }
.error-msg.visible { padding: 9px 12px; }

.submit-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff; border: none; padding: 13px;
  border-radius: 10px; font-size: 0.92rem; font-weight: 600;
  cursor: pointer; font-family: inherit; transition: all 0.2s; margin-top: 4px;
  box-shadow: 0 2px 14px rgba(108,92,231,0.28);
}
.submit-btn:hover { background: var(--accent2); transform: translateY(-1px); box-shadow: 0 4px 22px rgba(108,92,231,0.38); }
.submit-btn:active { transform: scale(0.98); }
.submit-btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.admin-note { display: flex; align-items: flex-start; gap: 7px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border); font-size: 0.76rem; color: var(--dim); line-height: 1.5; }
.admin-note svg { flex-shrink: 0; margin-top: 1px; color: var(--dim); }

@media (max-width: 480px) {
  .card { padding: 28px 22px 24px; border-radius: 14px; }
  .card-title { font-size: 1.25rem; }
}