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

:root {
  --bg: #000000;
  --surface: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.08);
  --cyan: #06b6d4;
  --purple: #a855f7;
  --text: #ffffff;
  --text-dim: rgba(255,255,255,0.65);
  --danger: #ef4444;
  --success: #22c55e;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
}

/* Particle Background */
.particles {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; overflow: hidden;
}
.particle {
  position: absolute; width: 2px; height: 2px;
  background: rgba(255,255,255,0.3); border-radius: 50%;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh) translateX(20px); opacity: 0; }
}

/* Navbar */
.navbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 4rem; background: rgba(0,0,0,0.9);
  backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid var(--border); overflow: hidden;
}
.navbar::after {
  content: ''; position: absolute; bottom: 0; left: -100%; width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--purple), transparent);
  animation: flowing-line 3s linear infinite;
}
@keyframes flowing-line { 0% { left: -100%; } 100% { left: 100%; } }

.logo {
  font-size: 1.5rem; font-weight: 700; font-family: 'Fira Code', monospace;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; text-decoration: none; cursor: pointer;
}
.hamburger { display: none; }
.nav-links { display: flex; gap: 0.5rem; list-style: none; align-items: center; }
.nav-link {
  color: var(--text); text-decoration: none; font-size: 0.85rem;
  transition: all 0.3s; padding: 0.5rem 0.8rem; border-radius: 8px;
  display: flex; align-items: center; gap: 6px; border: 1px solid transparent;
  cursor: pointer;
}
.nav-link svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; fill: none; }
.nav-link:hover, .nav-link.active {
  background: linear-gradient(135deg, rgba(6,182,212,0.15), rgba(168,85,247,0.15));
  border-color: rgba(6,182,212,0.3); color: var(--cyan);
}
.nav-link:hover svg, .nav-link.active svg { stroke: var(--cyan); }

.nav-auth { display: flex; gap: 0.5rem; align-items: center; }
.nav-user {
  color: var(--cyan); font-size: 0.85rem; font-weight: 500;
  display: flex; align-items: center; gap: 6px;
}
.nav-user .badge { font-size: 0.65rem; padding: 0.15rem 0.4rem; border-radius: 4px; }
.badge-admin { background: rgba(239,68,68,0.2); color: var(--danger); }

/* Buttons */
.btn-primary {
  padding: 0.6rem 1.5rem; background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: #fff; border: none; border-radius: 8px; font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 0.4rem;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 20px rgba(6,182,212,0.4); }
.btn-secondary {
  padding: 0.6rem 1.5rem; background: transparent; border: 2px solid var(--purple);
  color: #fff; border-radius: 12px; font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 0.4rem;
}
.btn-secondary:hover { background: rgba(168,85,247,0.1); border-color: var(--cyan); transform: translateY(-2px); }
.btn-outline {
  padding: 0.45rem 1rem; background: transparent; border: 1px solid var(--border);
  color: var(--text); border-radius: 6px; font-size: 0.8rem; cursor: pointer;
  transition: all 0.3s; display: inline-flex; align-items: center; gap: 5px; text-decoration: none;
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.75rem; }
.btn-danger { border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: rgba(239,68,68,0.15); color: var(--danger); }

/* Section Common */
.section { padding: 4rem 4rem 5rem; max-width: 1400px; margin: 0 auto; position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 0.5rem; }
.section-subtitle { color: var(--text-dim); font-size: 0.95rem; }
.highlight { background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* Modal */
.modal-overlay {
  display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.85); z-index: 200; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.show { display: flex; }
.modal {
  background: #0a0a0a; border: 1px solid var(--border); border-radius: 16px;
  padding: 2rem; width: 90%; max-width: 420px; position: relative;
  box-shadow: 0 24px 64px rgba(0,0,0,0.8);
}
.modal-close {
  position: absolute; top: 1rem; right: 1rem; background: none; border: none;
  color: var(--text-dim); font-size: 1.5rem; cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--text); }
.modal-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.5rem; text-align: center; }
.modal-title span { background: linear-gradient(135deg, var(--cyan), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0.4rem; }
.form-input {
  width: 100%; padding: 0.7rem 1rem; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  font-size: 0.9rem; transition: border-color 0.3s; font-family: 'Inter', sans-serif;
}
.form-input:focus { outline: none; border-color: var(--cyan); }
textarea.form-input { resize: vertical; }
.form-error { color: var(--danger); font-size: 0.8rem; margin-top: 0.3rem; min-height: 1.2em; }
.form-submit {
  width: 100%; padding: 0.75rem; background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: #fff; border: none; border-radius: 8px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: all 0.3s; margin-top: 0.5rem;
}
.form-submit:hover { transform: translateY(-1px); box-shadow: 0 8px 16px rgba(6,182,212,0.3); }
.form-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.modal-switch { text-align: center; margin-top: 1rem; font-size: 0.85rem; color: var(--text-dim); }
.modal-switch a { color: var(--cyan); cursor: pointer; text-decoration: none; }
.modal-switch a:hover { text-decoration: underline; }

/* Toast */
.toast-container { position: fixed; top: 1rem; right: 1rem; z-index: 300; display: flex; flex-direction: column; gap: 0.5rem; }
.toast {
  padding: 0.75rem 1.25rem; border-radius: 8px; font-size: 0.85rem; font-weight: 500;
  animation: slideIn 0.3s ease-out; max-width: 360px;
}
.toast-success { background: rgba(34,197,94,0.2); border: 1px solid var(--success); color: var(--success); }
.toast-error { background: rgba(239,68,68,0.2); border: 1px solid var(--danger); color: var(--danger); }
.toast-info { background: rgba(6,182,212,0.2); border: 1px solid var(--cyan); color: var(--cyan); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes slideOut { from { transform: translateX(0); opacity: 1; } to { transform: translateX(100%); opacity: 0; } }

/* Cards */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 1.5rem; transition: all 0.3s;
}
.card:hover { border-color: rgba(6,182,212,0.4); transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.5); }

/* Empty State */
.empty-state { text-align: center; padding: 3rem; color: var(--text-dim); }
.empty-state svg { width: 48px; height: 48px; stroke: var(--text-dim); margin-bottom: 1rem; }

/* Footer */
.footer {
  text-align: center; padding: 2rem; border-top: 1px solid var(--border);
  color: var(--text-dim); font-size: 0.8rem; position: relative; z-index: 1;
}

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(-30px); } to { opacity: 1; transform: translateX(0); } }

@media (max-width: 1024px) {
  .navbar { padding: 0.75rem 1.5rem; }
  .section { padding: 3rem 1.5rem 3rem; }
}

@media (max-width: 768px) {
  .navbar { padding: 0.6rem 1rem; position: relative; overflow: visible; }
  .logo { font-size: 1.2rem; }

  .hamburger {
    display: flex !important; flex-direction: column; gap: 4px;
    cursor: pointer; padding: 4px; z-index: 101; background: none; border: none;
  }
  .hamburger span {
    display: block; width: 22px; height: 2px;
    background: var(--text); border-radius: 2px; transition: all 0.3s;
  }
  .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

  .nav-links {
    display: none; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(0,0,0,0.98); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1rem;
  }
  .nav-links.open { display: flex !important; }
  .nav-link { padding: 0.7rem 0.5rem; font-size: 0.9rem; justify-content: flex-start; }
  .nav-link svg { width: 18px; height: 18px; }
  .nav-auth {
    padding: 0.5rem 0; border-top: 1px solid var(--border);
    margin-top: 0.25rem; width: 100%;
  }
  .nav-auth .btn-outline, .nav-auth .btn-primary {
    width: 100%; text-align: center; justify-content: center;
  }

  .section { padding: 2.5rem 1rem 3rem; }
  .section-title { font-size: 1.6rem; }
  .section-subtitle { font-size: 0.85rem; }

  .projects-grid { grid-template-columns: 1fr !important; }
  .stats-grid { grid-template-columns: 1fr !important; }

  .users-table { font-size: 0.75rem; }
  .users-table th, .users-table td { padding: 0.5rem 0.4rem; }

  .footer { padding: 1.5rem 1rem; font-size: 0.7rem; line-height: 1.6; }

  .toast-container { left: 1rem; right: 1rem; }
  .toast { max-width: 100%; font-size: 0.8rem; }
}