/* ==========================================================================
   Base — Typography, layout, utilities, animations
   Clean, minimal style inspired by Ranqer/GitBook
   ========================================================================== */

/* --- Body --- */
body {
  font-family: var(--ff);
  font-weight: var(--fw-regular);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--c-text);
  background: var(--c-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--wide { max-width: var(--container-wide); }
.container--narrow { max-width: var(--container-narrow); }

/* --- Typography (lighter weight, negative tracking like Ranqer) --- */
h1, h2, h3, h4 {
  font-weight: var(--fw-medium);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  color: var(--c-text);
}

h1 { font-size: var(--fs-display); }
h2 { font-size: clamp(var(--fs-3xl), 3.5vw, var(--fs-5xl)); }
h3 { font-size: var(--fs-2xl); font-weight: var(--fw-semibold); letter-spacing: -0.01em; }
h4 { font-size: var(--fs-xl); font-weight: var(--fw-semibold); }

p {
  color: var(--c-text-sec);
  line-height: var(--lh-normal);
  font-weight: var(--fw-medium);
}

.text-sm { font-size: var(--fs-sm); }
.text-lg { font-size: var(--fs-lg); }
.text-xl { font-size: var(--fs-xl); }
.text-muted { color: var(--c-text-muted); }

/* --- Mono label (Ranqer pattern: uppercase mono, primary color) --- */
.label-mono {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-primary);
  margin-bottom: var(--sp-4);
}

/* --- Body text styles --- */
.body-large {
  font-size: var(--fs-xl);
  font-weight: var(--fw-medium);
  color: var(--c-text-sec);
  line-height: var(--lh-relaxed);
}

.body-base {
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--c-text-sec);
  line-height: var(--lh-normal);
}

/* --- Links --- */
a { transition: color var(--dur) var(--ease); }

/* --- Buttons (pill-shaped like Ranqer) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-base);
  border-radius: var(--r-full);
  border: none;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
}

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

.btn--primary {
  background: var(--c-accent);
  color: var(--c-text);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

.btn--primary:hover {
  background: var(--c-accent-hover);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}

.btn--secondary {
  background: var(--c-text);
  color: white;
}

.btn--secondary:hover { background: #000000; }

.btn--outline {
  border: 2px solid var(--c-border);
  color: var(--c-text);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--c-text);
  background: var(--c-border-light);
}

.btn--ghost {
  background: var(--c-border-light);
  color: var(--c-text);
}

.btn--ghost:hover { background: var(--c-border); }

.btn--white {
  background: #ffffff;
  color: var(--c-text);
  box-shadow: var(--shadow-sm);
}

.btn--white:hover { background: var(--c-bg-alt); }

.btn--teal {
  background: var(--c-primary);
  color: var(--c-text-inv);
}

.btn--teal:hover { background: var(--c-primary-hover); }

.btn--lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: var(--fs-lg);
}

.btn--sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-sm);
}

/* --- Section spacing (generous like Ranqer) --- */
.section {
  padding: var(--sp-28) 0;
}

.section--alt {
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.section--dark {
  position: relative;
  overflow: hidden;
  background-color: var(--c-bg-dark);
  color: var(--c-dark-text);
}

/* Noise texture for dark sections */
.section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

.section--dark > * { position: relative; z-index: 1; }

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--sp-16);
}

.section__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-4);
  background: var(--c-primary-bg);
  color: var(--c-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  border-radius: var(--r-full);
  margin-bottom: var(--sp-4);
}

.section__label {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-primary);
  margin-bottom: var(--sp-4);
}

.section__title { margin-bottom: var(--sp-4); }

.section__subtitle {
  font-size: var(--fs-xl);
  font-weight: var(--fw-medium);
  color: var(--c-text-sec);
  max-width: 600px;
  margin: var(--sp-4) auto 0;
  line-height: var(--lh-relaxed);
}

/* --- Card (rounded-2xl like Ranqer) --- */
.card {
  background: var(--c-bg-card);
  border-radius: var(--r-2xl);
  padding: var(--sp-8);
  border: 1px solid var(--c-border);
  transition: all var(--dur) var(--ease);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-xl);
  margin-bottom: var(--sp-4);
  font-size: 1.5rem;
}

.card__title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-2);
  color: var(--c-text);
}

.card__text {
  font-size: var(--fs-sm);
  color: var(--c-text-sec);
  line-height: var(--lh-normal);
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: var(--sp-6);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* --- Gradient divider --- */
.divider-gradient {
  height: 1px;
  width: 100%;
  background: linear-gradient(to right, transparent, var(--c-border) 20%, var(--c-border) 80%, transparent);
}

/* --- Reveal animations (fadeUp + blur like Ranqer) --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(4px);
  transition:
    opacity 0.7s var(--ease),
    transform 0.7s var(--ease),
    filter 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.40s; }
.reveal-delay-6 { transition-delay: 0.48s; }

/* --- Keyframe animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes slow-spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.anim-fade-up { animation: fadeUp 0.7s var(--ease) both; }
.anim-fade-in { animation: fadeIn 0.5s var(--ease) both; }

/* --- Responsive --- */
@media (max-width: 1200px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: var(--sp-12) 0; }
  .section__header { margin-bottom: var(--sp-8); }

  .grid--2,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  /* Check cards: keep 2 columns on mobile */
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-3);
  }

  .container { padding: 0 var(--sp-4); }
}

@media (max-width: 480px) {
  .section { padding: var(--sp-10) 0; }
  .section__header { margin-bottom: var(--sp-6); }
}