@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');
@import url('https://cdn.jsdelivr.net/npm/remixicon@2.5.0/fonts/remixicon.css');

:root {
  --core-void: #0B0E1A;
  --core-deep: #131729;
  --core-panel: #1B2140;
  --core-violet: #7B2FF7;
  --core-violet-light: #9D5CFF;
  --core-cyan: #00E5D4;
  --core-cyan-dim: #0AA89C;
  --core-magenta: #FF3EA5;
  --core-text: #E6E9F5;
  --core-text-dim: #9BA3C4;
  --core-border: #2A3158;
  --core-success: #34D399;
  --core-warn: #FBBF24;
  --gradient-primary: linear-gradient(135deg, var(--core-violet) 0%, var(--core-magenta) 100%);
  --gradient-cyan: linear-gradient(135deg, var(--core-cyan) 0%, var(--core-violet) 100%);
  --gradient-dark: linear-gradient(180deg, var(--core-deep) 0%, var(--core-void) 100%);
  --shadow-glow: 0 0 40px rgba(123, 47, 247, 0.35);
  --shadow-glow-cyan: 0 0 30px rgba(0, 229, 212, 0.3);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--core-void);
  color: var(--core-text);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--core-void);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--core-violet), var(--core-cyan));
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--core-violet-light), var(--core-cyan));
}

.site-header {
  background-color: var(--core-deep);
  border-bottom: 1px solid var(--core-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: all 0.3s ease;
}

.site-header .logo-text {
  background: var(--gradient-cyan);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.nav-link {
  position: relative;
  color: var(--core-text-dim);
  font-weight: 500;
  transition: color 0.25s ease;
  padding-bottom: 4px;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-cyan);
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--core-text);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-link.active {
  color: var(--core-cyan);
}

.mobile-menu {
  background-color: var(--core-deep);
  border-top: 1px solid var(--core-border);
}

.mobile-menu-toggle {
  color: var(--core-text);
  font-size: 1.75rem;
  cursor: pointer;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 600;
  padding: 0.85rem 1.9rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 4px 20px rgba(123, 47, 247, 0.4);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--core-cyan);
  font-weight: 600;
  padding: 0.8rem 1.85rem;
  border-radius: 8px;
  border: 2px solid var(--core-cyan);
  cursor: pointer;
  transition: all 0.25s ease;
}
.btn-secondary:hover {
  background: var(--core-cyan);
  color: var(--core-void);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--core-text);
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease, color 0.25s ease;
}
.btn-ghost:hover {
  border-color: var(--core-violet-light);
  color: var(--core-violet-light);
}

/* Cards */
.tech-card {
  background: var(--core-panel);
  border: 1px solid var(--core-border);
  border-radius: 14px;
  padding: 2rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.tech-card:hover {
  transform: translateY(-6px);
  border-color: var(--core-violet);
  box-shadow: var(--shadow-glow);
}

.tech-card .card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--gradient-cyan);
  font-size: 1.6rem;
  color: var(--core-void);
  margin-bottom: 1.25rem;
}

.tech-card.static {
  cursor: default;
}
.tech-card.static:hover {
  transform: none;
  box-shadow: var(--shadow-card);
  border-color: var(--core-border);
}

.badge-popular {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  letter-spacing: 0.5px;
}

/* Grid */
.grid-section {
  display: grid;
  gap: 2rem;
}

/* Accordion */
.accordion-item {
  border: 1px solid var(--core-border);
  border-radius: 10px;
  background: var(--core-panel);
  margin-bottom: 1rem;
  overflow: hidden;
}
.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--core-text);
  transition: background 0.25s ease;
}
.accordion-header:hover {
  background: rgba(123, 47, 247, 0.08);
}
.accordion-header i {
  color: var(--core-cyan);
  transition: transform 0.3s ease;
}
.accordion-header.active i {
  transform: rotate(180deg);
}
.accordion-content {
  display: none;
  padding: 0 1.5rem 1.5rem;
  color: var(--core-text-dim);
  line-height: 1.7;
}

/* Forms */
.form-input,
.form-textarea,
.form-select {
  width: 100%;
  background: var(--core-deep);
  border: 1px solid var(--core-border);
  color: var(--core-text);
  padding: 0.85rem 1.1rem;
  border-radius: 8px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--core-text-dim);
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--core-cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 212, 0.15);
}
.form-label {
  display: block;
  color: var(--core-text-dim);
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.3px;
}
.form-group {
  margin-bottom: 1.5rem;
}

/* Loading spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-top-color: var(--core-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Hero glow */
.hero-glow {
  position: relative;
  overflow: hidden;
}
.hero-glow::before {
  content: '';
  position: absolute;
  top: -150px;
  right: -150px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(123, 47, 247, 0.35), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero-glow::after {
  content: '';
  position: absolute;
  bottom: -180px;
  left: -100px;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(0, 229, 212, 0.25), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.gradient-text {
  background: var(--gradient-cyan);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-dark {
  background: var(--gradient-dark);
}

.divider-glow {
  height: 2px;
  width: 80px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

/* Fade / animation utilities */
.fade-in {
  animation: fadeIn 0.6s ease both;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--core-cyan);
  box-shadow: 0 0 0 0 rgba(0, 229, 212, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 229, 212, 0.6); }
  70% { box-shadow: 0 0 0 12px rgba(0, 229, 212, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 212, 0); }
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--core-deep);
  border-top: 1px solid var(--core-border);
  color: var(--core-text);
  padding: 1.25rem 1.5rem;
  z-index: 200;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5);
}
.cookie-banner h3 {
  color: #fff;
}
.cookie-banner p {
  color: var(--core-text-dim);
}
.cookie-banner a {
  color: var(--core-cyan);
  text-decoration: underline;
}

/* Footer */
.site-footer {
  background: var(--core-void);
  border-top: 1px solid var(--core-border);
  color: var(--core-text-dim);
}
.site-footer h4 {
  color: #fff;
}
.site-footer a {
  color: var(--core-text-dim);
  transition: color 0.25s ease;
}
.site-footer a:hover {
  color: var(--core-cyan);
}

/* Table */
.tech-table {
  width: 100%;
  border-collapse: collapse;
}
.tech-table th {
  background: var(--core-panel);
  color: var(--core-cyan);
  text-align: left;
  padding: 1rem;
  border-bottom: 2px solid var(--core-border);
}
.tech-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--core-border);
  color: var(--core-text-dim);
}

/* Stats */
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Tabs */
.tab-btn {
  padding: 0.75rem 1.5rem;
  color: var(--core-text-dim);
  font-weight: 600;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
}
.tab-btn.active,
.tab-btn:hover {
  color: var(--core-cyan);
  border-bottom-color: var(--core-cyan);
}

@media (max-width: 768px) {
  .hero-glow::before,
  .hero-glow::after {
    display: none;
  }
  .stat-number {
    font-size: 1.9rem;
  }
}