/* ==========================================================================
   SV Schools - School Management System
   Custom CSS3 layer on top of Bootstrap 5
   ========================================================================== */

:root {
  --sv-primary: #1d4ed8;
  --sv-primary-dark: #1633a8;
  --sv-accent: #0ea5e9;
  --sv-ink: #0f172a;
  --sv-muted: #64748b;
  --sv-surface: #f5f7fb;
  --sv-border: #e2e8f0;
  --sv-radius: 14px;
  --sv-shadow: 0 10px 30px rgba(15, 23, 42, .08);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  color: var(--sv-ink);
  background-color: #fff;
}

a { text-decoration: none; }

/* ---------- Navbar / Logo ---------- */
.navbar-brand img { height: 40px; width: 40px; }

.brand-text {
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: .4px;
  color: var(--sv-primary);
}
.brand-text small {
  display: block;
  font-size: .62rem;
  font-weight: 500;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--sv-muted);
}

.navbar {
  box-shadow: 0 2px 14px rgba(15, 23, 42, .07);
  background: #fff;
}
.navbar .nav-link {
  font-weight: 600;
  color: var(--sv-ink);
  padding: .55rem .95rem !important;
  border-radius: 8px;
  transition: color .2s ease, background-color .2s ease;
}
.navbar .nav-link:hover,
.navbar .nav-link:focus { color: var(--sv-primary); background: rgba(29, 78, 216, .07); }
.navbar .nav-link.active { color: #fff !important; background: var(--sv-primary); }

/* ---------- Buttons ---------- */
.btn-sv {
  background: var(--sv-primary);
  border-color: var(--sv-primary);
  color: #fff;
  font-weight: 600;
  border-radius: 10px;
  padding: .6rem 1.4rem;
}
.btn-sv:hover, .btn-sv:focus {
  background: var(--sv-primary-dark);
  border-color: var(--sv-primary-dark);
  color: #fff;
}
.btn-sv-outline {
  border: 2px solid var(--sv-primary);
  color: var(--sv-primary);
  font-weight: 600;
  border-radius: 10px;
  padding: .55rem 1.35rem;
}
.btn-sv-outline:hover { background: var(--sv-primary); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--sv-primary) 0%, var(--sv-accent) 100%);
  color: #fff;
  padding: 5rem 0 6rem;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .09);
}
.hero h1 { font-weight: 800; font-size: clamp(2rem, 4vw, 3.1rem); }
.hero p.lead { color: rgba(255, 255, 255, .9); max-width: 560px; }

.page-head {
  background: var(--sv-surface);
  border-bottom: 1px solid var(--sv-border);
  padding: 2.6rem 0;
}
.page-head h1 { font-weight: 800; }

/* ---------- Cards ---------- */
.section { padding: 4rem 0; }
.section-title { font-weight: 800; }
.section-sub { color: var(--sv-muted); max-width: 620px; margin: 0 auto; }

.feature-card {
  background: #fff;
  border: 1px solid var(--sv-border);
  border-radius: var(--sv-radius);
  padding: 1.75rem;
  height: 100%;
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--sv-shadow); }

.feature-icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(29, 78, 216, .1);
  color: var(--sv-primary);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

/* ---------- Counters ---------- */
.stats { background: var(--sv-surface); }
.stat-value {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--sv-primary);
}
.stat-label { color: var(--sv-muted); font-weight: 600; letter-spacing: .5px; }

/* ---------- Tables ---------- */
.table-card {
  background: #fff;
  border: 1px solid var(--sv-border);
  border-radius: var(--sv-radius);
  box-shadow: var(--sv-shadow);
  overflow: hidden;
}
.table thead th {
  background: var(--sv-surface);
  color: var(--sv-muted);
  text-transform: uppercase;
  font-size: .74rem;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--sv-border);
  white-space: nowrap;
}
.table tbody tr:hover { background: rgba(29, 78, 216, .04); }

th.sortable { cursor: pointer; user-select: none; }
th.sortable .arrow { opacity: .35; font-size: .7rem; }
th.sortable.asc .arrow, th.sortable.desc .arrow { opacity: 1; color: var(--sv-primary); }

.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--sv-primary);
  color: #fff;
  display: inline-grid;
  place-items: center;
  font-weight: 700;
  font-size: .8rem;
}

/* ---------- Forms ---------- */
.form-card {
  background: #fff;
  border: 1px solid var(--sv-border);
  border-radius: var(--sv-radius);
  box-shadow: var(--sv-shadow);
  padding: 2rem;
}
.form-control:focus, .form-select:focus {
  border-color: var(--sv-accent);
  box-shadow: 0 0 0 .2rem rgba(14, 165, 233, .18);
}
.form-label { font-weight: 600; font-size: .9rem; }

.info-tile {
  border: 1px solid var(--sv-border);
  border-radius: var(--sv-radius);
  padding: 1.25rem;
  background: #fff;
  height: 100%;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--sv-ink);
  color: rgba(255, 255, 255, .72);
  padding: 3rem 0 1.25rem;
}
.site-footer h6 { color: #fff; font-weight: 700; letter-spacing: .5px; }
.site-footer a { color: rgba(255, 255, 255, .72); }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  margin-top: 2rem;
  padding-top: 1.25rem;
  font-size: .87rem;
}

/* ---------- Back to top ---------- */
#backToTop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--sv-primary);
  color: #fff;
  display: none;
  z-index: 1030;
  box-shadow: var(--sv-shadow);
}

@media (max-width: 767.98px) {
  .hero { padding: 3rem 0 3.5rem; text-align: center; }
  .hero p.lead { margin-inline: auto; }
  .section { padding: 2.75rem 0; }
}