/* ==========================================================================
   COMPONENTS.CSS — Reusable UI Components
   LlionTec.com Design System
   ========================================================================== */

/* ==========================================================================
   NAVBAR
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-navbar);
  background: transparent;
  transition:
    background-color var(--transition-base),
    backdrop-filter var(--transition-base),
    border-color var(--transition-base);
}

/* Scrolled state — glassmorphism effect */
.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

/* Container inside navbar */
.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);         /* 80px */
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* ── Logo ────────────────────────────────────────────────────────────────── */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  z-index: calc(var(--z-navbar) + 1);
}

.navbar-logo img {
  max-height: 40px;
  width: auto;
}

.navbar-logo span {
  font-family: var(--ff-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ── Desktop Menu ────────────────────────────────────────────────────────── */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);                  /* 2rem */
  list-style: none;
}

.navbar-menu a {
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  position: relative;
  padding-block: var(--space-1);
  transition: color var(--transition-fast);
}

.navbar-menu a:hover {
  color: var(--text-primary);
}

/* Gradient underline on hover */
.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base) var(--ease-out-expo);
}

.navbar-menu a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Active link */
.navbar-menu a.active {
  color: var(--accent-primary);
}

.navbar-menu a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ── Navbar Controls & Actions (theme toggle, hamburger, etc.) ───────── */
.navbar-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  z-index: calc(var(--z-navbar) + 2);
}

/* ── Hamburger Toggle (mobile only) ──────────────────────────────────── */
.navbar-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: calc(var(--z-navbar) + 2);
  gap: 5px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: var(--radius-full);
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast),
    width var(--transition-base);
}

/* Hamburger → X animation */
.navbar-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ── Mobile Menu Overlay ─────────────────────────────────────────────── */
.navbar-overlay {
  display: none;
}

/* ── Mobile Breakpoint ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .navbar-toggle {
    display: flex;
  }

  .navbar-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 80vw);
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-6);
    padding: var(--space-16) var(--space-8);
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid var(--glass-border);
    transition: right var(--transition-slow) var(--ease-out-expo);
    z-index: var(--z-navbar);
  }

  .navbar-menu.active {
    right: 0;
  }

  .navbar-menu a {
    font-size: var(--fs-xl);
    font-weight: var(--fw-semibold);
  }

  /* Dark overlay behind mobile menu */
  .navbar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-navbar) - 1);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base);
  }

  .navbar-overlay.active {
    opacity: 1;
    visibility: visible;
  }
}


/* ==========================================================================
   APP CARDS
   ========================================================================== */
.app-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.app-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 212, 255, 0.15);
  border-color: rgba(0, 212, 255, 0.25);
}

/* Card icon / thumbnail */
.app-card-icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  margin-bottom: var(--space-4);
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: block;
}

div.app-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent-primary);
}

div.app-card-icon svg {
  width: 32px;
  height: 32px;
}

.app-card:hover .app-card-icon {
  transform: scale(1.06);
  box-shadow: 0 6px 16px rgba(0, 212, 255, 0.25);
}

/* Card category tag */
.app-card-category {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: var(--space-2);
}

/* Card title */
.app-card-title {
  font-family: var(--ff-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-2);
}

/* Card description with line clamping */
.app-card-description {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-normal);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

/* Platform badges row */
.app-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}




/* ==========================================================================
   LAB CARDS
   ========================================================================== */
.lab-card {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-6);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.lab-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 212, 255, 0.2);
}

/* Lab card image */
.lab-card-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.lab-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Lab card content */
.lab-card-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.lab-card-title {
  font-family: var(--ff-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
}

.lab-card-description {
  font-size: var(--fs-base);
  color: var(--text-secondary);
  line-height: var(--lh-normal);
}

/* Tech badges */
.lab-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Resource links */
.lab-card-resources {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: auto;
}

.lab-card-resources a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--accent-primary);
  transition: color var(--transition-fast);
}

.lab-card-resources a:hover {
  color: var(--accent-secondary);
}

.lab-card-resources a svg,
.lab-card-resources a i {
  width: 16px;
  height: 16px;
}

/* Lab card mobile */
@media (max-width: 768px) {
  .lab-card {
    grid-template-columns: 1fr;
  }

  .lab-card-image {
    aspect-ratio: 16 / 9;
  }
}


/* ==========================================================================
   BUTTONS
   ========================================================================== */

/* ── Base Button ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base);
}

/* ── Primary Button — Gradient ───────────────────────────────────────── */
.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-full);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow:
    0 8px 25px rgba(0, 212, 255, 0.3),
    0 4px 12px rgba(124, 58, 237, 0.2);
}

.btn-primary:active {
  transform: scale(0.98);
}

/* Shimmer effect on hover */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.15),
    transparent
  );
  transition: left var(--transition-slow);
}

.btn-primary:hover::before {
  left: 100%;
}




/* ==========================================================================
   CONTACT FORM
   ========================================================================== */
.contact-form {
  width: 100%;
}

/* ── Form Group — Floating Label Pattern ─────────────────────────────── */
.form-group {
  position: relative;
  margin-bottom: var(--space-6);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  background: var(--bg-surface);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--fs-base);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: transparent;                   /* Hidden — label acts as placeholder */
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
  line-height: var(--lh-normal);
}

/* Floating label */
.form-group label {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--fs-base);
  color: var(--text-muted);
  pointer-events: none;
  transition: all var(--transition-base);
  line-height: 1;
}

/* Textarea label — positioned at top */
.form-group textarea ~ label {
  top: 1rem;
  transform: translateY(0);
}

/* Label float state — on focus or when input has value */
.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label {
  top: 0;
  transform: translateY(-50%) scale(0.85);
  background: var(--bg-surface);
  padding: 0 var(--space-2);
  color: var(--accent-primary);
  font-weight: var(--fw-medium);
}

.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
  top: 0;
  transform: translateY(-50%) scale(0.85);
  background: var(--bg-surface);
  padding: 0 var(--space-2);
  color: var(--accent-primary);
  font-weight: var(--fw-medium);
}

/* Validation states */
.form-group.valid input,
.form-group.valid textarea {
  border-color: var(--color-success);
}

.form-group.valid input:focus,
.form-group.valid textarea:focus {
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

.form-group.error input,
.form-group.error textarea {
  border-color: var(--color-error);
}

.form-group.error input:focus,
.form-group.error textarea:focus {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}




/* ==========================================================================
   FILTER BUTTONS
   ========================================================================== */
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  cursor: pointer;
  transition:
    all var(--transition-base);
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.filter-btn.active {
  background: var(--gradient-brand);
  color: #ffffff;
  border-color: transparent;
}


/* ==========================================================================
   BADGES
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  line-height: 1;
  white-space: nowrap;
}

/* Platform-specific badge colors */
.badge-ios {
  background: rgba(0, 122, 255, 0.15);
  color: #0a84ff;
}

.badge-android {
  background: rgba(52, 168, 83, 0.15);
  color: #34a853;
}

.badge-arduino {
  background: rgba(0, 151, 157, 0.15);
  color: #00979d;
}

.badge-esp32 {
  background: rgba(255, 152, 0, 0.15);
  color: #ff9800;
}

.badge-raspberry {
  background: rgba(205, 33, 82, 0.15);
  color: #cd2152;
}



.badge-python {
  background: rgba(55, 118, 171, 0.15);
  color: #3776ab;
}


/* ==========================================================================
   THEME TOGGLE
   ========================================================================== */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    transform var(--transition-base);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--bg-elevated);
}

.theme-toggle svg,
.theme-toggle i {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
}