:root {
  --sv-primary: #34eee5;
  --sv-primary-600: #2bc9c1;
  --sv-primary-100: #c7faf7;
  --sv-primary-50: #e8fffe;
  --sv-text: #101114;
  --sv-text-on-dark: #ffffff;
  --sv-muted: #d1d5db;
  --sv-surface: #ffffff;
  --sv-surface-2: #3f9a9e;
  --sv-outline: #d4d4d8;
  --sv-shadow: 0 10px 24px rgba(16, 17, 20, 0.14);
  --sv-radius: 16px;
  --sv-font: 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: #3f9a9e;
  color: var(--sv-text-on-dark);
  font-family: var(--sv-font);
  font-size: 17px;
  line-height: 1.6;
  min-height: 100vh;
}

/* Links */
a {
  color: var(--sv-primary);
  text-decoration: none;
  transition: color 0.18s ease;
  font-weight: 600;
}
a:hover {
  color: var(--sv-primary-600);
}

/* Buttons */
.button {
  font-family: var(--sv-font);
  background: var(--sv-primary);
  color: #0b0b0b;
  border: none;
  border-radius: 999px;
  padding: 0.65em 1.5em;
  font-size: 1em;
  font-weight: 600;
  box-shadow: var(--sv-shadow);
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.button:hover {
  background: var(--sv-primary-600);
  transform: translateY(-1px);
}

/* Forms */
.input, .textarea, .select select {
  background: var(--sv-surface);
  color: var(--sv-text);
  border: 1px solid var(--sv-outline);
  border-radius: 12px;
  font-family: var(--sv-font);
  padding: 0.6em 0.9em;
  font-size: 1em;
  margin-bottom: 1em;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.input:focus, .textarea:focus, .select select:focus {
  border-color: var(--sv-primary);
  box-shadow: 0 0 0 3px rgba(194, 24, 91, 0.2);
  outline: none;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--sv-text);
  margin-top: 1.2em;
  margin-bottom: 0.6em;
}
h1 {
  font-size: 2.6em;
  color: var(--sv-primary);
}
h2 {
  font-size: 2em;
}
h3 {
  font-size: 1.5em;
}

.sv-section-title {
  color: var(--sv-text);
  font-weight: 700;
}

/* Cards, panels, sections */
.card, .panel, section {
  background: var(--sv-surface);
  border: 1px solid var(--sv-outline);
  box-shadow: var(--sv-shadow);
  padding: 1.5em 1.2em;
  margin-bottom: 2em;
  border-radius: var(--sv-radius);
  position: relative;
  z-index: 1;
  color: var(--sv-text);
}

/* Accent line */
.rf-accent-line {
  display: block;
  width: 100px;
  height: 4px;
  background: var(--sv-primary);
  margin: 1em 0;
  border-radius: 999px;
}

/* Accent text utility */
.rf-neon,
.rf-neon-blue,
.rf-neon-yellow {
  color: var(--sv-primary);
  text-shadow: none;
}

/* Responsive */
@media (max-width: 700px) {
  html, body {
    font-size: 16px;
  }
  h1 { font-size: 2em; }
  h2 { font-size: 1.4em; }
  h3 { font-size: 1.15em; }
  .card, .panel, section {
    padding: 1.1em 0.9em;
  }
}

/* Utility classes */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.flex-space-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2em;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2em;
}

::-webkit-scrollbar {
  width: 8px;
  background: var(--sv-surface-2);
}
::-webkit-scrollbar-thumb {
  background: rgba(16, 17, 20, 0.2);
  border-radius: 999px;
}