/* Matrix dark theme with neon animations */
@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&display=swap');

:root {
  --bg-0: #000;           /* deep black */
  --bg-1: #060d06;        /* nearly black green */
  --bg-2: #0b1b0b;        /* panel background */
  --grid: rgba(0,255,140,0.06);
  --text: #c8ffd7;        /* pale green */
  --text-dim: #9cebb9;
  --neon: #00ff88;        /* primary neon */
  --neon-2: #00e676;      /* secondary neon */
  --danger: #ff4d4d;
  --shadow: 0 0 12px rgba(0,255,136,0.35), 0 0 28px rgba(0,255,136,0.15);
}

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

/* Background with subtle matrix rain + grid */
body {
  font-family: 'Share Tech Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 50% -10%, rgba(0,255,136,0.07), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-0));
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* animated grid and rain */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

/* subtle vertical code-rain columns */
body::before {
  background-image:
    repeating-linear-gradient(90deg, transparent 0 94px, var(--grid) 94px 95px),
    repeating-linear-gradient(180deg, rgba(0,255,140,0.035) 0 2px, transparent 2px 6px);
  animation: rain 14s linear infinite;
}

/* vignette + glow haze */
body::after {
  background:
    radial-gradient(1100px 600px at 20% 10%, rgba(0,255,136,0.06), transparent 65%),
    radial-gradient(900px 600px at 80% 0%, rgba(0,255,136,0.04), transparent 60%),
    radial-gradient(1200px 500px at 50% 100%, rgba(0,0,0,0.65), transparent 70%);
}

@keyframes rain {
  0% { background-position: 0 0, 0 0; }
  100% { background-position: 0 600px, 0 480px; }
}

/* Layout */
main.main-layout {
  display: flex;
  gap: 0;
  max-width: 100%;
  margin: 0;
  padding: 0;
  height: calc(100vh - 140px);
  position: relative;
}

/* Header */
header {
  background: linear-gradient(180deg, rgba(0,0,0,0.85), rgba(0,0,0,0.75));
  border-bottom: 1px solid rgba(0,255,136,0.2);
  text-align: center;
  padding: 1.25rem 1rem 1rem;
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  z-index: 100;
}

.header-content { display: flex; justify-content: center; align-items: center; position: relative; margin-bottom: .5rem; }
header h1 { margin: 0; letter-spacing: .06em; text-shadow: 0 0 12px rgba(0,255,136,.35); color: var(--text); }

.user-info { position: absolute; right: 0; top: 50%; transform: translateY(-50%); text-align: right; font-size: .9rem; line-height: 1.2; }
.user-name { font-weight: 700; color: var(--text); text-shadow: 0 0 8px rgba(0,255,136,.25); }
.user-email { font-size: .8rem; color: var(--text-dim); }

/* Nav */
nav { display: flex; gap: .5rem; justify-content: center; flex-wrap: wrap; margin-top: .5rem; }
nav a {
  color: var(--text);
  text-decoration: none;
  padding: .45rem .9rem;
  border: 1px solid rgba(0,255,136,0.25);
  background: linear-gradient(180deg, rgba(0,0,0,0.45), rgba(0,0,0,0.2));
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .2s ease, color .2s ease, border-color .2s ease;
}
nav a:hover { transform: translateY(-2px); box-shadow: 0 0 18px rgba(0,255,136,.55), 0 0 32px rgba(0,255,136,.2); border-color: var(--neon); color: #eafff3; }
nav a.active { background: linear-gradient(180deg, rgba(0,255,136,.15), rgba(0,0,0,.45)); border-color: var(--neon); color: #eafff3; box-shadow: 0 0 15px rgba(0,255,136,.4), 0 0 28px rgba(0,255,136,.15); }

/* Panels - for other pages */
.about-container, .login-container, .form-container {
  background: linear-gradient(180deg, rgba(11,27,11,.95), rgba(6,13,6,.95));
  border: 1px solid rgba(0,255,136,.25);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,.5), 0 0 40px rgba(0,255,136,.08);
  backdrop-filter: blur(2px);
}

/* Search - for other pages */
.search-container { margin-bottom: 2rem; text-align: center; }
.search-container form { display: inline-flex; gap: .6rem; align-items: center; }
.search-container input {
  padding: .65rem .85rem;
  width: min(70vw, 360px);
  color: var(--text);
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(0,255,136,.3);
  border-radius: 10px;
  outline: none;
  transition: box-shadow .2s ease, border-color .2s ease, transform .08s ease;
}
.search-container input:focus { border-color: var(--neon); box-shadow: 0 0 0 3px rgba(0,255,136,.15), 0 0 20px rgba(0,255,136,.2); transform: translateY(-1px); }

.search-container button {
  padding: .65rem 1.1rem;
  background: linear-gradient(180deg, rgba(0,0,0,.65), rgba(0,0,0,.35));
  color: var(--text);
  border: 1px solid rgba(0,255,136,.35);
  border-radius: 10px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .2s ease, border-color .2s ease, color .2s ease;
}
.search-container button:hover { transform: translateY(-2px); border-color: var(--neon); color: #eafff3; box-shadow: 0 0 18px rgba(0,255,136,.55), 0 0 32px rgba(0,255,136,.2); }

/* Alerts */
.error, .success {
  padding: 1rem; border-radius: 8px; margin-bottom: 1rem; border: 1px solid transparent; box-shadow: 0 8px 24px rgba(0,0,0,.35);
}
.error { background: rgba(255,77,77,.08) !important; color: var(--danger) !important; border-color: rgba(255,77,77,.25) !important; text-shadow: 0 0 8px rgba(255,77,77,.2); }
.success { background: rgba(0,255,136,.08) !important; color: var(--neon) !important; border-color: rgba(0,255,136,.25) !important; text-shadow: 0 0 8px rgba(0,255,136,.25); }

/* Tables */
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }

thead th {
  background: rgba(0,0,0,.45);
  color: var(--text);
  font-weight: 700;
  border-bottom: 1px solid rgba(0,255,136,.25);
}

table th, table td { padding: 1rem; text-align: left; border-bottom: 1px solid rgba(0,255,136,.15); }

table tbody tr { transition: background-color .2s ease, box-shadow .2s ease; }

table tbody tr:hover { background: rgba(0,255,136,.04); box-shadow: inset 0 0 0 1px rgba(0,255,136,.12); }

table td[colspan] { color: var(--text-dim); text-align: center; }

/* About text */
.author-info p { margin: 1rem 0; font-size: 1.05rem; color: var(--text); }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: .5rem; font-weight: 700; color: var(--text-dim); letter-spacing: .03em; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  color: var(--text);
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(0,255,136,.25);
  border-radius: 10px;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, transform .08s ease;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--neon); box-shadow: 0 0 0 3px rgba(0,255,136,.16), 0 0 24px rgba(0,255,136,.18); transform: translateY(-1px); }

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.form-actions button,
.form-actions a {
  flex: 1;
}

/* Buttons */
.login-container form button,
.btn-primary, .btn-secondary, .btn-create {
  width: 100%;
  padding: 0.8rem 1.2rem;
  color: var(--text);
  background: linear-gradient(180deg, rgba(0,0,0,.65), rgba(0,0,0,.35));
  border: 1px solid rgba(0,255,136,.35);
  border-radius: 12px;
  cursor: pointer;
  font-size: 1rem;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .2s ease, border-color .2s ease, color .2s ease, background .2s ease;
  display: inline-block;
  text-align: center;
}

/* preserve inline width for form buttons */
.login-container form button { width: 100%; }

.btn-primary, .btn-create { background: linear-gradient(180deg, rgba(0,255,136,.15), rgba(0,0,0,.45)); border-color: var(--neon); color: #eafff3; }
.btn-secondary { background: linear-gradient(180deg, rgba(0,0,0,.65), rgba(0,0,0,.35)); color: var(--text); }

.login-container form button:hover,
.btn-primary:hover, .btn-secondary:hover, .btn-create:hover {
  transform: translateY(-2px);
  border-color: var(--neon);
  color: #eafff3;
  box-shadow: 0 0 18px rgba(0,255,136,.55), 0 0 36px rgba(0,255,136,.25);
}


/* Footer */
footer {
  background: linear-gradient(180deg, rgba(0,0,0,.75), rgba(0,0,0,.85));
  color: var(--text-dim);
  text-align: center;
  padding: 1rem;
  position: fixed;
  bottom: 0;
  width: 100%;
  border-top: 1px solid rgba(0,255,136,.2);
  backdrop-filter: blur(12px);
  z-index: 100;
}

/* Micro-interactions */
@keyframes glowPulse {
  0%,100% { text-shadow: 0 0 8px rgba(0,255,136,.25); }
  50% { text-shadow: 0 0 18px rgba(0,255,136,.55); }
}

h1 { animation: glowPulse 4s ease-in-out infinite; }

/* Buttons for user management */
.btn-edit {
  padding: 0.4rem 0.8rem;
  margin-right: 0.5rem;
  color: var(--text);
  background: linear-gradient(180deg, rgba(0,230,118,.15), rgba(0,0,0,.45));
  border: 1px solid rgba(0,230,118,.35);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.8rem;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .2s ease, border-color .2s ease;
  display: inline-block;
}

.btn-edit:hover {
  transform: translateY(-2px);
  border-color: var(--neon-2);
  color: #eafff3;
  box-shadow: 0 0 18px rgba(0,230,118,.55), 0 0 36px rgba(0,230,118,.25);
}

.btn-delete {
  padding: 0.4rem 0.8rem;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255,77,77,.15), rgba(0,0,0,.45));
  border: 1px solid rgba(255,77,77,.35);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.8rem;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .2s ease, border-color .2s ease;
  display: inline-block;
}

.btn-delete:hover {
  transform: translateY(-2px);
  border-color: var(--danger);
  color: #ffffff;
  box-shadow: 0 0 18px rgba(255,77,77,.55), 0 0 36px rgba(255,77,77,.25);
}

.no-delete {
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.8rem;
}

/* Sidebar Styles */
.courses-sidebar {
  width: 350px;
  min-width: 350px;
  background: linear-gradient(180deg, rgba(11,27,11,.98), rgba(6,13,6,.98));
  border-right: 1px solid rgba(0,255,136,.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(0,255,136,.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(180deg, rgba(0,0,0,.45), transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.sidebar-header h2 {
  font-size: 1.1rem;
  margin: 0;
  color: var(--text);
  text-shadow: 0 0 10px rgba(0,255,136,.35);
}

.btn-create-small {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(0,255,136,.2), rgba(0,0,0,.45));
  border: 1px solid var(--neon);
  border-radius: 8px;
  color: #eafff3;
  font-size: 1.5rem;
  font-weight: bold;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .2s ease;
}

.btn-create-small:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 0 20px rgba(0,255,136,.6), 0 0 40px rgba(0,255,136,.3);
}

.search-container-sidebar {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(0,255,136,.15);
  background: rgba(0,0,0,.25);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 67px;
  z-index: 9;
}

.search-container-sidebar form {
  display: flex;
  gap: .5rem;
}

.search-container-sidebar input {
  flex: 1;
  padding: .6rem .75rem;
  color: var(--text);
  background: rgba(0,0,0,.45);
  border: 1px solid rgba(0,255,136,.3);
  border-radius: 8px;
  outline: none;
  font-size: .9rem;
  transition: box-shadow .2s ease, border-color .2s ease;
}

.search-container-sidebar input:focus {
  border-color: var(--neon);
  box-shadow: 0 0 0 3px rgba(0,255,136,.15), 0 0 16px rgba(0,255,136,.2);
}

.search-container-sidebar button {
  padding: .6rem .9rem;
  background: linear-gradient(180deg, rgba(0,0,0,.65), rgba(0,0,0,.35));
  border: 1px solid rgba(0,255,136,.35);
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: transform .12s ease, box-shadow .2s ease;
}

.search-container-sidebar button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 16px rgba(0,255,136,.5);
}

.courses-list {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 1.25rem;
  position: relative;
  mask-image: linear-gradient(to bottom, transparent 0, black 20px, black calc(100% - 20px), transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, black 20px, black calc(100% - 20px), transparent 100%);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.courses-list::-webkit-scrollbar {
  width: 6px;
}

.courses-list::-webkit-scrollbar-track {
  background: rgba(0,0,0,.3);
}

.courses-list::-webkit-scrollbar-thumb {
  background: rgba(0,255,136,.3);
  border-radius: 3px;
  transition: background .2s ease;
}

.courses-list::-webkit-scrollbar-thumb:hover {
  background: rgba(0,255,136,.5);
}

.course-card {
  background: linear-gradient(135deg, rgba(0,0,0,.7), rgba(11,27,11,.6));
  border: 2px solid rgba(0,255,136,.4);
  border-radius: 14px;
  padding: 1.5rem;
  margin: 0;
  cursor: pointer;
  transition: all .25s ease;
  box-shadow: 0 8px 24px rgba(0,0,0,.6), 0 0 30px rgba(0,255,136,.08), inset 0 1px 0 rgba(0,255,136,.1);
  flex-shrink: 0;
  text-decoration: none;
  display: block;
  color: inherit;
}

.course-card:hover {
  transform: translateX(6px) translateY(-2px);
  border-color: var(--neon);
  background: linear-gradient(135deg, rgba(0,255,136,.12), rgba(11,27,11,.65));
  box-shadow: 0 10px 30px rgba(0,255,136,.25), 0 0 40px rgba(0,255,136,.15);
}

.course-card.selected {
  border-color: var(--neon);
  background: linear-gradient(135deg, rgba(0,255,136,.18), rgba(11,27,11,.7));
  box-shadow: 0 0 0 3px rgba(0,255,136,.2), 0 10px 30px rgba(0,255,136,.35), 0 0 40px rgba(0,255,136,.2);
  transform: translateX(8px);
}

.course-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .65rem;
  text-shadow: 0 0 10px rgba(0,255,136,.25);
  line-height: 1.3;
}

.course-category {
  display: inline-block;
  font-size: .75rem;
  color: var(--neon);
  background: rgba(0,255,136,.12);
  padding: .25rem .6rem;
  border-radius: 6px;
  border: 1px solid rgba(0,255,136,.3);
  margin-bottom: .6rem;
}

.course-description {
  font-size: .85rem;
  color: var(--text-dim);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.empty-message {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-dim);
  font-style: italic;
}

/* Main Content Area */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 3rem;
  position: relative;
}

.main-content::-webkit-scrollbar {
  width: 8px;
}

.main-content::-webkit-scrollbar-track {
  background: rgba(0,0,0,.2);
}

.main-content::-webkit-scrollbar-thumb {
  background: rgba(0,255,136,.3);
  border-radius: 4px;
}

.main-content::-webkit-scrollbar-thumb:hover {
  background: rgba(0,255,136,.5);
}

.welcome-panel {
  background: linear-gradient(135deg, rgba(11,27,11,.95), rgba(6,13,6,.85));
  border: 1px solid rgba(0,255,136,.25);
  border-radius: 12px;
  padding: 3rem 2.5rem;
  box-shadow: 0 10px 40px rgba(0,0,0,.5), 0 0 60px rgba(0,255,136,.08);
  text-align: center;
  margin-bottom: 2rem;
}

.welcome-panel h2 {
  color: var(--text);
  margin-bottom: 1rem;
  text-shadow: 0 0 12px rgba(0,255,136,.35);
  font-size: 1.8rem;
}

.welcome-panel p {
  color: var(--text-dim);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.stat-item {
  background: linear-gradient(135deg, rgba(0,255,136,.08), rgba(0,0,0,.45));
  border: 1px solid rgba(0,255,136,.3);
  border-radius: 10px;
  padding: 1.5rem 2.5rem;
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 24px rgba(0,255,136,.4), 0 0 48px rgba(0,255,136,.15);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--neon);
  text-shadow: 0 0 20px rgba(0,255,136,.5);
  margin-bottom: .5rem;
}

.stat-label {
  font-size: .9rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .1em;
}

/* For other pages (non-index) */
main:not(.main-layout) {
  max-width: 1200px;
  margin: 2rem auto 5rem;
  padding: 0 1rem;
}

/* Course Detail View */
.course-detail {
  background: linear-gradient(135deg, rgba(11,27,11,.95), rgba(6,13,6,.85));
  border: 1px solid rgba(0,255,136,.25);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 10px 40px rgba(0,0,0,.5), 0 0 60px rgba(0,255,136,.08);
  animation: fadeIn .4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.course-detail-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid rgba(0,255,136,.2);
}

.course-detail-title {
  color: var(--text);
  font-size: 2.2rem;
  margin-bottom: .75rem;
  text-shadow: 0 0 15px rgba(0,255,136,.4);
  line-height: 1.3;
}

.course-detail-category {
  display: inline-block;
  font-size: .9rem;
  color: var(--neon);
  background: rgba(0,255,136,.15);
  padding: .4rem .9rem;
  border-radius: 8px;
  border: 1px solid rgba(0,255,136,.35);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.course-detail-section {
  margin-bottom: 2.5rem;
}

.course-detail-section h3 {
  color: var(--text);
  font-size: 1.5rem;
  margin-bottom: 1rem;
  text-shadow: 0 0 10px rgba(0,255,136,.3);
  position: relative;
  padding-left: 1rem;
}

.course-detail-section h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--neon), var(--neon-2));
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(0,255,136,.5);
}

.course-detail-description {
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.8;
  margin: 0;
}

.curriculum-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: .8rem;
}

.curriculum-list li {
  background: linear-gradient(135deg, rgba(0,0,0,.5), rgba(11,27,11,.4));
  border-left: 3px solid var(--neon-2);
  padding: .9rem 1.2rem;
  color: var(--text);
  font-size: .95rem;
  border-radius: 8px;
  transition: all .2s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,.3);
  position: relative;
  padding-left: 2.5rem;
}

.curriculum-list li::before {
  content: "✓";
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--neon);
  font-weight: bold;
  font-size: 1.1rem;
}

.curriculum-list li:hover {
  transform: translateX(6px);
  background: linear-gradient(135deg, rgba(0,255,136,.08), rgba(11,27,11,.5));
  border-left-color: var(--neon);
  box-shadow: 0 6px 16px rgba(0,255,136,.2);
}

.course-detail-actions {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(0,255,136,.15);
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
}

.course-detail-actions .btn-secondary {
  width: auto;
  padding: .85rem 1.8rem;
  text-decoration: none;
}

.admin-actions {
  margin-bottom: 1rem;
}

.admin-actions .btn-primary {
  width: auto;
  padding: .85rem 1.8rem;
  text-decoration: none;
}

.admin-actions .btn-danger {
  width: auto;
  padding: .85rem 1.8rem;
  text-decoration: none;
  background: linear-gradient(180deg, rgba(255,77,77,.15), rgba(0,0,0,.45));
  border-color: rgba(255,77,77,.35);
}

.admin-actions .btn-danger:hover {
  border-color: var(--danger);
  color: #ffffff;
  box-shadow: 0 0 18px rgba(255,77,77,.55), 0 0 36px rgba(255,77,77,.25);
}

/* Utility */
.hidden { display: none !important; }