/* ==========================================
   BUK INTELLIGENT TIMETABLE MANAGEMENT SYSTEM
   Main Stylesheet
   Horizontal Overflow Fixed
========================================== */

:root {
  --primary: #0056a6;
  --primary-light: #0d6efd;
  --primary-dark: #003f7d;
  --gold: #f4b400;
  --white: #ffffff;
  --background: #f5f7fb;
  --text: #2c3e50;
  --muted: #6c757d;
  --border: #e5e9f0;
  --shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.12);
  --radius: 14px;
  --sidebar-width: 260px;
  --desktop-content-width: 1100px;
}

/* GLOBAL */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

::selection {
  background: var(--primary);
  color: var(--white);
}

img,
video,
iframe {
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  max-width: 100%;
}

/* LOGIN PAGE */

.login-wrapper {
  width: 100%;
  min-width: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 30px 20px;
  overflow-x: hidden;
  background:
    linear-gradient(
      135deg,
      rgba(0, 86, 166, 0.08),
      rgba(244, 180, 0, 0.05)
    ),
    var(--background);
}

.login-card {
  width: 100%;
  max-width: 430px;
  min-width: 0;
  flex-shrink: 0;
  margin: auto;
  background: var(--white);
  border-radius: 20px;
  padding: 40px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0, 86, 166, 0.08);
}

.login-card:hover {
  box-shadow: var(--shadow-hover);
}

.login-logo {
  width: 90px;
  height: auto;
  object-fit: contain;
  display: block;
  margin: 0 auto 15px;
}

.login-card h1,
.login-card h2,
.login-card h3 {
  color: var(--primary);
  font-weight: 700;
}

.login-card label {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.login-card input,
.login-card select {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 11px 13px;
  transition: 0.25s ease;
}

.login-card input:focus,
.login-card select:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.12);
}

/* BUTTONS */

.btn-primary {
  background: var(--primary);
  border: none;
  border-radius: 9px;
  font-weight: 600;
  padding: 10px 18px;
  transition: all 0.25s ease;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 5px 12px rgba(0, 86, 166, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-warning {
  background: var(--gold);
  border-color: var(--gold);
  color: #000;
  font-weight: 600;
  border-radius: 9px;
}

.btn-warning:hover {
  background: #d99f00;
  border-color: #d99f00;
  color: #000;
}

/* MAIN WRAPPER */

.wrapper {
  display: flex;
  min-height: 100vh;
  min-width: 0;
}

/* SIDEBAR */

.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(
    180deg,
    var(--primary),
    var(--primary-dark)
  );
  color: var(--white);
  position: fixed;
  left: 0;
  top: 0;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 1000;
  box-shadow: 4px 0 18px rgba(0, 0, 0, 0.08);
}

.sidebar::-webkit-scrollbar {
  width: 5px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.35);
  border-radius: 10px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

/* SIDEBAR HEADER */

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
}

.sidebar-logo {
  width: 70px;
  height: auto;
  margin-bottom: 10px;
}

.sidebar-header h1,
.sidebar-header h2,
.sidebar-header h3,
.sidebar-header h4,
.sidebar-header p {
  color: var(--white);
}

/* SIDEBAR MENU */

.sidebar-menu {
  list-style: none;
  margin: 0;
  padding: 12px 10px;
}

.sidebar-menu li {
  border-bottom: none;
  margin-bottom: 4px;
}

.sidebar-menu li a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 15px;
  border-radius: 9px;
  transition: all 0.25s ease;
  font-size: 14px;
  font-weight: 500;
}

.sidebar-menu li a:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  transform: translateX(3px);
}

.sidebar-menu li a i {
  font-size: 17px;
  min-width: 20px;
}

/* ACTIVE MENU */

.sidebar-menu .active a {
  background: var(--gold);
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

.sidebar-menu .active a:hover {
  background: var(--gold);
  color: #000;
  transform: translateX(0);
}

/* MAIN CONTENT */

.main-content {
  margin-left: var(--sidebar-width);
  width: calc(100% - var(--sidebar-width));
  min-width: 0;
  min-height: 100vh;
  background: var(--background);
}

/* TOPBAR */

.topbar {
  background: var(--white);
  padding: 16px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  min-height: 72px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 900;
}

.topbar h1,
.topbar h2,
.topbar h3 {
  color: var(--primary);
  margin-bottom: 0;
  font-weight: 700;
}

/* PAGE CONTENT */

.main-content > .container,
.main-content > .container-fluid {
  padding-top: 25px;
  padding-bottom: 30px;
  min-width: 0;
}

/* DASHBOARD CARDS */

.dashboard-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  overflow: hidden;
}

.dashboard-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.dashboard-card .card-body {
  padding: 22px;
}

.dashboard-card h1,
.dashboard-card h2,
.dashboard-card h3,
.dashboard-card h4,
.dashboard-card h5 {
  color: var(--text);
  font-weight: 700;
}

.dashboard-icon {
  font-size: 38px;
  color: var(--primary);
}

/* GENERAL CARDS */

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-width: 0;
}

.card-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  color: var(--primary);
  font-weight: 700;
  padding: 15px 20px;
}

.card-body {
  padding: 20px;
  min-width: 0;
}

/* TABLES */

.table {
  background: var(--white);
  margin-bottom: 0;
}

.table thead th {
  background: var(--primary);
  color: var(--white);
  border: none;
  font-weight: 600;
  padding: 13px 12px;
  white-space: nowrap;
}

.table tbody td {
  padding: 12px;
  vertical-align: middle;
  border-color: var(--border);
}

.table tbody tr {
  transition: background 0.2s ease;
}

.table tbody tr:hover {
  background: rgba(0, 86, 166, 0.035);
}

.table-responsive {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* FORMS */

.form-control,
.form-select {
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 12px;
  transition: 0.25s ease;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.12);
}

/* BADGES */

.badge {
  border-radius: 20px;
  padding: 6px 10px;
  font-weight: 600;
}

/* ALERTS */

.alert {
  border-radius: 10px;
  border: none;
}

/* MODALS */

.modal-content {
  border: none;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
}

.modal-header {
  background: var(--primary);
  color: var(--white);
  border-bottom: none;
}

.modal-header .btn-close {
  filter: brightness(0) invert(1);
}

.modal-footer {
  border-top: 1px solid var(--border);
}

/* DROPDOWNS */

.dropdown-menu {
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 7px;
}

.dropdown-item {
  border-radius: 7px;
  padding: 9px 12px;
}

.dropdown-item:hover {
  background: rgba(0, 86, 166, 0.08);
  color: var(--primary);
}

/* PAGINATION */

.page-link {
  color: var(--primary);
  border-color: var(--border);
}

.page-item.active .page-link {
  background: var(--primary);
  border-color: var(--primary);
}

/* FOOTER */

footer {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: 18px;
  color: var(--muted);
}

/* LINKS */

a {
  transition: 0.2s ease;
}

/* TABLET */

@media (max-width: 992px) {
  .sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
  }

  .main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    min-width: 0;
  }

  .topbar {
    padding: 16px 20px;
  }

  .dashboard-icon {
    font-size: 34px;
  }
}

/* PHONE: PREVENT PAGE OVERFLOW */

@media (max-width: 768px) {
  html {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
  }

  body {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: hidden;
  }

  .wrapper {
    display: flex;
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    max-width: 85vw;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
  }

  .sidebar-header {
    padding: 24px 20px;
  }

  .sidebar-logo {
    width: 70px;
  }

  .sidebar-menu {
    padding: 12px 10px;
  }

  .sidebar-menu li a {
    padding: 12px 15px;
  }

  .main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    min-width: 0;
    max-width: calc(100% - var(--sidebar-width));
  }

  .topbar {
    width: 100%;
    max-width: 100%;
    padding: 16px 12px;
    flex-wrap: wrap;
  }

  .main-content > .container,
  .main-content > .container-fluid {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    padding: 20px 12px 30px;
  }

  .row {
    --bs-gutter-x: 1rem;
  }

  .card,
  .card-body,
  .dashboard-card {
    min-width: 0;
    max-width: 100%;
  }

  .table-responsive {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .login-wrapper {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px 15px;
  }

  .login-card {
    width: 100%;
    max-width: 430px;
    min-width: 0;
    padding: 24px 20px;
    border-radius: 16px;
  }

  img,
  video,
  iframe {
    max-width: 100%;
  }

  input,
  select,
  textarea {
    max-width: 100%;
  }
}

/* SMALL PHONES */

@media (max-width: 480px) {
  .sidebar-header {
    padding: 24px 20px;
  }

  .sidebar-logo {
    width: 70px;
  }

  .sidebar-menu {
    padding: 12px 10px;
  }

  .topbar {
    padding: 14px 12px;
  }

  .login-wrapper {
    padding: 20px 12px;
  }

  .login-card {
    padding: 24px 18px;
  }

  .dashboard-icon {
    font-size: 30px;
  }

  .card-body {
    padding: 15px;
  }

  .btn {
    border-radius: 8px;
  }
}