/* ─── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  /* Neutral palette — calm and professional */
  --color-bg:          #f8f7f5;
  --color-surface:     #ffffff;
  --color-border:      #e5e2dc;
  --color-border-focus:#4a6fa5;

  --color-text:        #2c2c2c;
  --color-text-muted:  #6b6b6b;
  --color-text-light:  #999;

  /* Brand — muted blue, trustworthy */
  --color-primary:     #4a6fa5;
  --color-primary-hover:#3a5f95;
  --color-primary-light:#eef2f8;

  /* Feedback */
  --color-error:       #c0392b;
  --color-error-bg:    #fdf3f2;
  --color-success:     #2d7a4f;
  --color-success-bg:  #f0faf4;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 15px;
  --line-height: 1.6;

  /* Spacing */
  --radius:   8px;
  --radius-sm: 5px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.05);
  --shadow:    0 4px 12px rgba(0,0,0,.08);
}

/* ─── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html { font-size: var(--font-size-base); }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}
h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Navigation ────────────────────────────────────────────────────────────── */
.site-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}
.nav-logo:hover { text-decoration: none; color: var(--color-primary); }
.site-nav nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
}

/* ─── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  line-height: 1;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); color: #fff; }

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: #bbb; background: #fafaf9; }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--color-primary-light); }

.btn-danger {
  background: var(--color-surface);
  color: var(--color-error);
  border-color: var(--color-border);
}
.btn-danger:hover { background: var(--color-error-bg); border-color: #e8bbb8; }

.btn-sm { padding: 6px 13px; font-size: 0.85rem; }
.btn-full { width: 100%; }
.btn-link {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
  font-size: inherit;
  color: var(--color-text-muted);
  cursor: pointer;
}
.btn-link:hover { color: var(--color-text); text-decoration: underline; }

/* ─── Form controls ─────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}
.form-group .hint {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}
.label-link {
  font-size: 0.8rem;
  font-weight: 400;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
input[type="date"],
textarea,
select {
  display: block;
  width: 100%;
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  -webkit-appearance: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(74,111,165,0.12);
}
textarea { resize: vertical; min-height: 90px; }
select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b6b6b' d='M6 8L0 0h12z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; cursor: pointer; }

/* Radio + checkbox */
.radio-group, .checkbox-group { display: flex; flex-direction: column; gap: 8px; }
.radio-option, .checkbox-option {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  cursor: pointer;
}
.radio-option input, .checkbox-option input { width: 16px; height: 16px; flex-shrink: 0; cursor: pointer; accent-color: var(--color-primary); }

/* ─── Alerts ────────────────────────────────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 20px;
  line-height: 1.5;
}
.alert-error { background: var(--color-error-bg); color: var(--color-error); border: 1px solid #f0c4c0; }
.alert-success { background: var(--color-success-bg); color: var(--color-success); border: 1px solid #b5dfc9; }

/* ─── Auth pages ────────────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 16px;
}
.auth-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.auth-card--centered { text-align: center; }
.auth-header {
  margin-bottom: 28px;
}
.auth-header h1 { margin-bottom: 4px; }
.auth-header p { color: var(--color-text-muted); font-size: 0.9rem; margin: 0; }
.auth-logo {
  display: inline-block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 20px;
  text-decoration: none;
}
.auth-logo:hover { color: var(--color-primary); text-decoration: none; }
.auth-form { margin-bottom: 20px; }
.auth-footer { text-align: center; font-size: 0.875rem; color: var(--color-text-muted); margin: 0; }
.auth-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
  color: var(--color-primary);
}
.auth-icon--error { color: var(--color-error); }

/* ─── Dashboard shell ───────────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}
.app-sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-logo {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  text-decoration: none;
  padding: 4px 8px;
  margin-bottom: 16px;
  display: block;
}
.sidebar-link {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}
.sidebar-link:hover { background: var(--color-primary-light); color: var(--color-primary); text-decoration: none; }
.sidebar-link.active { background: var(--color-primary-light); color: var(--color-primary); font-weight: 500; }
.sidebar-spacer { flex: 1; }

.app-main {
  flex: 1;
  padding: 36px 40px;
  overflow-y: auto;
}
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
}
.page-header h1 { margin: 0; }

/* ─── Cards / table ─────────────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.card + .card { margin-top: 16px; }

.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-muted);
}
.empty-state h3 { color: var(--color-text-muted); font-weight: 500; }

/* ─── Utilities ─────────────────────────────────────────────────────────────── */
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: 0.875rem; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ─── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .auth-card { padding: 28px 20px; }
  .app-sidebar { display: none; }
  .app-main { padding: 24px 16px; }
}