:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #1c1f23;
  --muted: #5b6470;
  --border: #d9dde2;
  --accent: #2c5fb3;
  --accent-hover: #234a8c;
  --danger: #b3261e;
  --danger-bg: #fdecea;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --surface: #1f242a;
    --text: #e8ebee;
    --muted: #9aa3ad;
    --border: #2e353c;
    --accent: #6ea3ff;
    --accent-hover: #94bdff;
    --danger: #ff7a73;
    --danger-bg: #3a1f1d;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

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

/* ===== Login ===== */
.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.login-card h1 {
  margin: 0 0 4px;
  font-size: 20px;
}

.login-card .subtitle {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 4px;
}

input[type="email"],
input[type="password"],
input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
textarea,
select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}

.field { margin-bottom: 14px; }

button.primary {
  width: 100%;
  padding: 10px 14px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
button.primary:hover { background: var(--accent-hover); }
button.primary:disabled { opacity: 0.6; cursor: progress; }

.error {
  margin: 0 0 14px;
  padding: 9px 11px;
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: var(--radius);
  font-size: 13px;
}

/* ===== App shell ===== */
.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 600;
  font-size: 15px;
}

.topbar nav {
  display: flex;
  gap: 16px;
}

.topbar nav a {
  color: var(--muted);
  font-size: 14px;
}
.topbar nav a:hover,
.topbar nav a.active {
  color: var(--text);
  text-decoration: none;
}

.topbar .user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--muted);
}

.topbar button.linklike {
  background: transparent;
  border: 0;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  padding: 0;
}
.topbar button.linklike:hover { text-decoration: underline; }

.app-content {
  padding: 24px;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
}

.placeholder {
  padding: 40px;
  text-align: center;
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}