/* ------------------------------------------------------
   GLOBAL STUDENT THEME (Light / Dark / Neon)
---------------------------------------------------------*/
:root {
  --bg: #f3f6ff;
  --text: #1a1a1a;
  --primary: #7b5cff;
  --secondary: #00b7ff;
  --card: rgba(255, 255, 255, 0.7);
  --nav: rgba(255, 255, 255, 0.5);
  --shadow: rgba(0, 0, 0, 0.1);
}

body.dark {
  --bg: #0c0c0f;
  --text: #f5f5f5;
  --primary: #6a00ff;
  --secondary: #00eaff;
  --card: rgba(20,20,20,0.6);
  --nav: rgba(20,20,20,0.5);
}

body.neon {
  --bg: #050014;
  --text: #fff;
  --primary: #ff00ff;
  --secondary: #00ffff;
  --card: rgba(80,0,150,0.35);
  --nav: rgba(25,0,70,0.5);
}

/* ------------------------------------------------------
   BASE
---------------------------------------------------------*/
body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: 0.3s ease;
}

/* ------------------------------------------------------
   NAVBAR
---------------------------------------------------------*/
header {
  position: sticky;
  top: 0;
  padding: 18px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--nav);
  backdrop-filter: blur(15px);
  border-bottom: 1px solid var(--primary);
  z-index: 1000;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo svg {
  width: 45px;
  height: 45px;
  fill: var(--primary);
  filter: drop-shadow(0 0 8px var(--primary));
}
.logo span {
  font-size: 22px;
  font-weight: 700;
}

nav {
  display: flex;
  gap: 32px;
}
nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  position: relative;
}
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 2px;
  background: var(--primary);
  transition: 0.3s;
}
nav a:hover::after {
  width: 100%;
}

/* Mobile toggle */
.menu-btn {
  display: none;
  border: none;
  background: none;
}
.menu-btn svg {
  width: 35px;
  height: 35px;
  fill: var(--text);
}

/* Mobile menu */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--nav);
  padding: 20px;
}
.mobile-nav a {
  padding: 12px 0;
  border-bottom: 1px solid var(--primary);
  text-decoration: none;
  color: var(--text);
}

/* ------------------------------------------------------
   BUTTONS (Neon Animated SVG)
---------------------------------------------------------*/
.neon-btn {
  position: relative;
  padding: 15px 38px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
}

.neon-btn svg rect {
  stroke: var(--primary);
  stroke-width: 3;
  stroke-dasharray: 350;
  stroke-dashoffset: 350;
  transition: 0.7s;
  filter: drop-shadow(0 0 6px var(--primary));
}

.neon-btn:hover rect {
  stroke-dashoffset: 0;
}

.neon-btn span {
  position: absolute;
  left: 35px;
  top: 15px;
  font-weight: 700;
}

/* ------------------------------------------------------
   AUTH PAGES
---------------------------------------------------------*/
.auth-wrapper {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.auth-card {
  width: 380px;
  padding: 35px;
  background: var(--card);
  border-radius: 20px;
  border: 1px solid var(--primary);
  backdrop-filter: blur(15px);
  box-shadow: 0 0 20px var(--primary);
}

.auth-card h2 {
  margin-top: 0;
  text-align: center;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  color: transparent;
  font-size: 30px;
}

.auth-card p {
  text-align: center;
  opacity: 0.7;
}

.input-group {
  margin-top: 15px;
}
.input-group label {
  font-weight: 600;
}
.input-group input {
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  border-radius: 10px;
  border: 1px solid var(--primary);
  background: rgba(255,255,255,0.5);
  font-size: 15px;
}

.btn {
  margin-top: 25px;
  width: 100%;
  padding: 14px;
  font-size: 18px;
  border: none;
  border-radius: 12px;
  color: white;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  cursor: pointer;
  font-weight: 700;
  box-shadow: 0 0 12px var(--primary);
  transition: 0.3s;
}
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 20px var(--secondary);
}

.auth-link {
  text-align: center;
  margin-top: 18px;
}
.auth-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

/* Theme + language */
.theme-toggle {
  cursor: pointer;
  margin-bottom: 12px;
  font-weight: 700;
}
.lang-dropdown {
  margin-bottom: 20px;
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
  nav {
    display: none;
  }
  .menu-btn {
    display: block;
  }
  .mobile-nav {
    display: none;
  }
  .mobile-nav.active {
    display: flex;
  }
}