:root {
  --bg0: #0f1c24;
  --bg1: #17303b;
  --card: rgba(255, 255, 255, 0.94);
  --ink: #14212a;
  --muted: #5b6b75;
  --line: #d7e0e6;
  --accent: #0f766e;
  --accent2: #115e59;
  --danger: #b42318;
  --shadow: 0 24px 60px rgba(8, 20, 28, 0.35);
  --radius: 18px;
  --font: "Segoe UI", "Trebuchet MS", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #2a6f7a 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1d4e63 0%, transparent 50%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.shell {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

.card {
  width: min(440px, 100%);
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px 28px;
  backdrop-filter: blur(8px);
}

.card.wide { width: min(860px, 100%); }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, #14b8a6, #0f766e 55%, #134e4a);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.2);
}
.brand h1 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}
.brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 14px 0 6px;
}
input[type=text], input[type=password] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 1rem;
  outline: none;
  background: #fff;
}
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 20px;
  border: 0;
  border-radius: 12px;
  padding: 13px 16px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, #0f766e, var(--accent2));
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { filter: brightness(1.05); }
.btn.secondary {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  width: auto;
  padding: 10px 14px;
  font-weight: 500;
}

.err {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fef3f2;
  color: var(--danger);
  font-size: 0.92rem;
  display: none;
}
.err.show { display: block; }

.hint {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.topbar .who { color: var(--muted); font-size: 0.92rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.base {
  display: block;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  text-decoration: none;
  color: var(--ink);
  background: #fff;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.base:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(15, 118, 110, 0.12);
}
.base strong { display: block; font-size: 1.02rem; margin-bottom: 4px; }
.base span { color: var(--muted); font-size: 0.85rem; }