/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --danger-dark: #b91c1c;
  --success-bg: #dcfce7;
  --success-border: #16a34a;
  --danger-bg: #fee2e2;
  --danger-border: #dc2626;
  --warning-bg: #fef9c3;
  --warning-border: #ca8a04;
  --info-bg: #dbeafe;
  --info-border: #2563eb;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.5;
}

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

/* ===== Navbar ===== */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-brand a {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo {
  height: 38px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--gray-600);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.nav-user {
  font-size: 0.875rem;
  color: var(--gray-600);
  font-weight: 500;
}

.btn-logout {
  background: var(--gray-100);
  color: var(--gray-700) !important;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  border-bottom: none !important;
}
.btn-logout:hover { background: var(--gray-200); text-decoration: none !important; }

/* ===== Container ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* ===== Flash messages ===== */
.flash-messages { margin-bottom: 1rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  border-left: 4px solid;
}

.alert-success { background: var(--success-bg); border-color: var(--success-border); color: #166534; }
.alert-danger  { background: var(--danger-bg);  border-color: var(--danger-border);  color: #991b1b; }
.alert-warning { background: var(--warning-bg); border-color: var(--warning-border); color: #92400e; }
.alert-info    { background: var(--info-bg);    border-color: var(--info-border);    color: #1e40af; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s;
  text-decoration: none;
}

.btn-primary  { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); text-decoration: none; color: #fff; }

.btn-danger   { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-dark); border-color: var(--danger-dark); text-decoration: none; color: #fff; }

.btn-outline  { background: #fff; color: var(--gray-700); border-color: var(--gray-300); }
.btn-outline:hover { background: var(--gray-100); text-decoration: none; color: var(--gray-900); }

.btn-secondary { background: var(--gray-100); color: var(--gray-700); border-color: var(--gray-200); }
.btn-secondary:hover { background: var(--gray-200); text-decoration: none; }

.btn-sm { padding: 0.3rem 0.65rem; font-size: 0.8rem; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Auth pages ===== */
.auth-logo-wrap {
  text-align: center;
  margin: 2rem auto 1rem;
}

.auth-logo-img {
  height: 72px;
  width: auto;
}

.auth-card {
  max-width: 420px;
  margin: 3rem auto;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 2rem 2rem 1.5rem;
  box-shadow: var(--shadow-md);
}

.auth-card h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.auth-subtitle { color: var(--gray-600); font-size: 0.9rem; margin-bottom: 1.5rem; }
.auth-link { text-align: center; margin-top: 1rem; font-size: 0.875rem; color: var(--gray-600); }

/* ===== Forms ===== */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.3rem; color: var(--gray-700); }
.form-group small { color: var(--gray-600); }

input[type="text"], input[type="email"], input[type="password"],
input[type="date"], select, .form-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--gray-900);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

.field-error { color: var(--danger); font-size: 0.8rem; display: block; margin-top: 0.25rem; }

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}
.form-row .form-group { flex: 1; min-width: 150px; margin-bottom: 0; }
.form-group-btn { flex: none; }

/* ===== Page header ===== */
.page-header { margin-bottom: 1.25rem; }
.page-header h1 { font-size: 1.6rem; }
.page-subtitle { color: var(--gray-600); font-size: 0.9rem; margin-top: 0.25rem; }

/* ===== Week nav ===== */
.week-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.week-label { font-weight: 600; font-size: 1rem; }

/* ===== Instrument filter bar ===== */
.instr-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.instr-filter-bar label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  white-space: nowrap;
}

.instr-filter-bar select {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: #fff;
  color: var(--gray-800);
  cursor: pointer;
  min-width: 180px;
}

/* ===== Mode toggle ===== */
.mode-toggle {
  display: flex;
  gap: 0;
  margin-bottom: 1.25rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  overflow: hidden;
  width: fit-content;
}
.mode-btn {
  background: #fff;
  border: none;
  padding: 0.45rem 1.1rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--gray-600);
  transition: background 0.15s;
}
.mode-btn.active { background: var(--primary); color: #fff; }
.mode-btn:not(.active):hover { background: var(--gray-100); }

/* ===== Status message ===== */
.status-msg {
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-top: 0.75rem;
}
.status-success { background: var(--success-bg); color: #166534; border-left: 4px solid var(--success-border); }
.status-danger  { background: var(--danger-bg);  color: #991b1b; border-left: 4px solid var(--danger-border); }

/* ===== Form card ===== */
.form-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}
.form-card h2 { font-size: 1.1rem; margin-bottom: 1rem; }

/* ===== Data table ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.875rem;
}
.data-table thead th {
  background: var(--gray-100);
  padding: 0.65rem 0.85rem;
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-200);
}
.data-table tbody td {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--gray-50); }
.past-row { opacity: 0.6; }

/* ===== Section title ===== */
.section-title { font-size: 1rem; font-weight: 600; color: var(--gray-600); margin: 1rem 0 0.5rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* ===== Empty state ===== */
.empty-state { color: var(--gray-600); font-size: 0.9rem; padding: 1rem 0; }

/* ===== Badge ===== */
.badge { display: inline-block; padding: 0.15rem 0.5rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge-active { background: #dcfce7; color: #166534; }
.badge-inactive { background: var(--gray-200); color: var(--gray-600); }

/* ===== Add section ===== */
.add-section {
  margin-top: 2rem;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}
.add-section h2 { font-size: 1rem; font-weight: 600; margin-bottom: 0.75rem; }

/* ===== Inline input ===== */
.inline-input {
  border: 1px solid transparent;
  background: transparent;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.875rem;
  width: 100%;
}
.inline-input:not([disabled]) {
  border-color: var(--primary);
  background: #fff;
}
.action-cell { white-space: nowrap; display: flex; gap: 0.4rem; align-items: center; }

/* ===== Form grid ===== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.form-group-check { display: flex; align-items: center; gap: 0.4rem; }
.form-group-check label { display: flex; align-items: center; gap: 0.4rem; font-size: 0.875rem; cursor: pointer; }
.form-group-check input[type="checkbox"] { width: auto; }

dl { display: grid; grid-template-columns: 140px 1fr; gap: 0.5rem 1rem; margin: 0; }
dt { color: var(--gray-600); font-size: 0.875rem; }
dd { margin: 0; font-size: 0.9rem; }

/* ===== Popover ===== */
.popover {
  position: fixed;
  z-index: 200;
  background: #fff;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1rem 1.25rem;
  min-width: 260px;
  max-width: 340px;
}
.popover-inner p { font-size: 0.9rem; margin-bottom: 0.75rem; color: var(--gray-700); }
.popover-btns { display: flex; gap: 0.5rem; }

/* ===== Error page ===== */
.error-page {
  text-align: center;
  padding: 4rem 1rem;
  max-width: 480px;
  margin: 0 auto;
}
.error-page h1 { font-size: 1.75rem; margin-bottom: 0.5rem; }
.error-page p { color: var(--gray-600); margin-bottom: 1.5rem; }