/* =========================================================
   EklavyaX — STUDENT LAB SIMULATIONS
   Chalkboard & Interactive STEM Simulation Aesthetic
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Kalam:wght@400;700&family=Work+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --board: #162c22;
  --board-dark: #0f1d16;
  --board-surface: #1a3327;
  --chalk: #f5f0e2;
  --chalk-dim: #a9bdae;
  --marigold: #eeb43e;
  --marigold-dark: #d4982a;
  --terracotta: #d97a5c;
  --paper: #f3ead4;
  --paper-soft: #eae0c8;
  --paper-line: rgba(60, 45, 20, 0.08);
  --ink: #2a3b4d;
  --ink-soft: #5a6b78;
  --accent-blue: #4059a5;
  --accent-green: #22c55e;
  --font-hand: 'Kalam', cursive;
  --font-body: 'Work Sans', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 700px at 50% -10%, rgba(255, 255, 255, 0.04), transparent 60%),
    radial-gradient(900px 600px at 90% 100%, rgba(0, 0, 0, 0.35), transparent 60%),
    linear-gradient(135deg, #0d1e17 0%, #152b21 50%, #0c1c15 100%);
  color: var(--chalk);
  font-family: var(--font-body);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, black, transparent 95%);
}

.container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar,
aside.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 100;
  width: 240px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #11221a 0%, #0d1a14 100%);
  border-right: 1.5px dashed rgba(245, 240, 226, 0.15);
  box-shadow: 10px 0 35px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

aside .logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 26px 22px 20px;
}

.logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-hand);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--marigold);
}

nav.menu {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
}

nav.menu a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  border-radius: 12px;
  color: var(--chalk-dim);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

nav.menu a i {
  width: 20px;
  text-align: center;
  font-size: 1.05rem;
}

nav.menu a:hover {
  background: rgba(245, 240, 226, 0.07);
  color: var(--chalk);
  transform: translateX(4px);
}

nav.menu a.active {
  background: linear-gradient(135deg, var(--paper) 0%, var(--paper-soft) 100%);
  color: var(--ink);
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

nav.menu a.active i {
  color: var(--terracotta);
}

aside .profile {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 12px 20px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed rgba(245, 240, 226, 0.18);
  border-radius: 14px;
  color: var(--chalk);
  cursor: pointer;
}

aside .profile img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--marigold);
  background: var(--paper);
  object-fit: cover;
}

aside .profile .profile-info strong {
  display: block;
  font-family: var(--font-hand);
  font-size: 1.05rem;
  color: var(--chalk);
}

aside .profile .profile-info span {
  font-size: 0.78rem;
  color: var(--terracotta);
  font-weight: 600;
}

/* Main Content */
.content {
  flex-grow: 1;
  min-width: 0;
  min-height: 100vh;
  margin-left: 240px;
  padding: 28px 32px 48px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.header {
  padding: 24px 30px;
  background:
    repeating-linear-gradient(transparent, transparent 27px, var(--paper-line) 28px),
    linear-gradient(135deg, var(--paper) 0%, var(--paper-soft) 100%);
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  border-radius: 20px;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);
}

.header h1 {
  font-family: var(--font-hand);
  font-size: clamp(1.6rem, 2.5vw, 2.1rem);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.header p {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.section {
  padding: 24px 28px;
  background: rgba(22, 44, 34, 0.85);
  border: 1px solid rgba(245, 240, 226, 0.14);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.section h3 {
  font-family: var(--font-hand);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--marigold);
  margin-bottom: 4px;
}

.subheading {
  font-size: 0.92rem;
  color: var(--chalk-dim);
  margin-bottom: 20px;
  font-weight: 500;
}

/* Simulation Cards Grid */
.carousel,
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.lab-card,
.card {
  background: rgba(15, 29, 22, 0.85);
  border: 1.5px dashed rgba(245, 240, 226, 0.18);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  transition: all 0.25s ease;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.25);
  position: relative;
  overflow: hidden;
}

.lab-card:hover,
.card:hover {
  transform: translateY(-5px);
  border-color: var(--marigold);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.4);
}

.lab-card img,
.card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 12px;
  background: #09130e;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.lab-card h3,
.lab-card h4,
.card h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--chalk);
  margin-bottom: 14px;
  min-height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lab-card button,
.card button {
  width: 100%;
  padding: 10px 0;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--marigold), var(--marigold-dark));
  color: #11221a;
  font-weight: 800;
  font-size: 0.92rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(238, 180, 62, 0.25);
  transition: all 0.2s ease;
}

.lab-card button:hover,
.card button:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(238, 180, 62, 0.4);
}

/* =========================================================
   SIMULATION PLAYER MODAL
   ========================================================= */

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(5, 12, 9, 0.92);
  backdrop-filter: blur(10px);
  padding: 24px;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-dialog {
  background: #11221a;
  border: 1.5px solid rgba(238, 180, 62, 0.4);
  border-radius: 18px;
  width: 100%;
  max-width: 1100px;
  height: 88vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
  animation: modalScale 0.25s ease-out;
}

@keyframes modalScale {
  from { transform: scale(0.96); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(22, 44, 34, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-title-wrap h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--chalk);
}

.modal-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-btn {
  background: rgba(255, 255, 255, 0.08);
  color: var(--chalk);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.modal-btn:hover {
  background: var(--marigold);
  color: #11221a;
}

.close-btn {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.close-btn:hover {
  background: #ef4444;
  color: #ffffff;
}

.modal-content {
  flex: 1;
  width: 100%;
  height: 100%;
  background: #000000;
  position: relative;
}

.modal-content iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* =========================================================
   RESPONSIVE DESIGN (PHONES: <= 768px)
   ========================================================= */

@media (max-width: 992px) {
  .sim-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  html,
  body {
    width: 100% !important;
    max-width: 100% !important;
    overflow-x: hidden !important;
  }

  .container {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .sidebar,
  aside.sidebar {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    width: 100% !important;
    min-width: 0 !important;
    max-width: 100% !important;
    height: auto !important;
    min-height: 0 !important;
    margin: 0 !important;
    display: block !important;
    overflow: visible !important;
    border-right: none !important;
    border-bottom: 1.5px dashed rgba(245, 240, 226, 0.15) !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25) !important;
  }

  aside .logo {
    width: 100% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: flex-start !important;
    gap: 10px !important;
    padding: 14px 16px 10px !important;
  }

  .logo img {
    width: 32px !important;
    height: 32px !important;
  }

  .logo-text {
    font-size: 1.35rem !important;
  }

  nav.menu {
    width: 100% !important;
    display: flex !important;
    flex-direction: row !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    gap: 8px !important;
    padding: 4px 12px 12px !important;
    flex: none !important;
    scrollbar-width: none !important;
    -webkit-overflow-scrolling: touch;
  }

  nav.menu::-webkit-scrollbar {
    display: none !important;
  }

  nav.menu a {
    width: auto !important;
    min-width: max-content !important;
    padding: 8px 14px !important;
    gap: 7px !important;
    font-size: 0.76rem !important;
    border-radius: 10px !important;
    flex-shrink: 0 !important;
    white-space: nowrap !important;
    transform: none !important;
  }

  nav.menu a i {
    width: auto !important;
    min-width: auto !important;
    font-size: 0.85rem !important;
  }

  aside .profile {
    display: none !important;
  }

  .content {
    margin-left: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    padding: 16px 14px 40px !important;
    gap: 16px !important;
    overflow-x: hidden !important;
  }

  .hero-card {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 12px !important;
    padding: 18px 16px !important;
  }

  .hero-card h1 {
    font-size: 1.4rem !important;
  }

  .filter-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 10px !important;
  }

  .filter-tabs {
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    padding-bottom: 4px !important;
    scrollbar-width: none !important;
  }

  .filter-tabs::-webkit-scrollbar {
    display: none !important;
  }

  .filter-tab {
    flex-shrink: 0 !important;
    padding: 7px 12px !important;
    font-size: 0.78rem !important;
  }

  .search-wrap {
    width: 100% !important;
    max-width: 100% !important;
  }

  .sim-grid {
    grid-template-columns: 1fr !important;
    gap: 14px !important;
  }

  .sim-card {
    padding: 14px !important;
    border-radius: 16px !important;
  }

  .modal-dialog {
    width: 98vw !important;
    height: 90vh !important;
    border-radius: 12px !important;
  }

  .modal-bar {
    padding: 10px 14px !important;
  }

  .modal-title-wrap h2 {
    font-size: 0.95rem !important;
  }
}

@media (max-width: 480px) {
  .content {
    padding: 12px 10px 35px !important;
  }

  .hero-card {
    padding: 14px 12px !important;
  }

  .sim-card {
    padding: 12px !important;
  }
}