/* ================================================
   TREPUTIN x Shuffle - Main Stylesheet
   ================================================ */

/* -------------------- CSS Variables -------------------- */
:root {
  --bg: #0b0b11;
  --bg-elev: #12121a;
  --surface: #171722;
  --surface-2: #1c1b28;
  --text: #f2f4f7;
  --text-dim: #b8b9c3;
  --accent: #7c4dff;
  --accent-2: #9b6bff;
  --accent-3: #6138ff;
  --border: rgba(255, 255, 255, 0.08);
  --glow: 0 0 0 transparent;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --focus: 0 0 0 3px rgba(124, 77, 255, 0.45);
  --container: 1200px;

  /* Spacing */
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 20px;
  --space-5: 28px;
  --space-6: 40px;
  --space-7: 56px;

  /* Gradients */
  --grad-hero: radial-gradient(
      60% 120% at 10% 0%,
      rgba(124, 77, 255, 0.18),
      transparent 60%
    ),
    radial-gradient(
      60% 120% at 90% 20%,
      rgba(155, 107, 255, 0.14),
      transparent 60%
    ),
    linear-gradient(180deg, #0b0b11 0%, #0e0e16 100%);

  --grad-page: radial-gradient(
      60% 120% at 15% 0%,
      rgba(124, 77, 255, 0.18),
      transparent 60%
    ),
    radial-gradient(
      70% 120% at 90% 10%,
      rgba(155, 107, 255, 0.12),
      transparent 60%
    ),
    linear-gradient(180deg, #0b0b11 0%, #0e0e16 100%);
}

/* -------------------- Base Reset & Typography -------------------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu,
    Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* -------------------- Layout Utilities -------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: absolute;
  left: 10px;
  top: 10px;
  width: auto;
  height: auto;
  padding: 10px;
  background: var(--accent);
  color: white;
  z-index: 100;
  border-radius: var(--radius-sm);
}

/* -------------------- Header & Navigation -------------------- */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: linear-gradient(
    to bottom,
    rgba(10, 10, 16, 0.7),
    rgba(10, 10, 16, 0.35)
  );
  border-bottom: 1px solid var(--border);
}

.nav {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand .logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(
      135deg,
      rgba(124, 77, 255, 0.35),
      rgba(155, 107, 255, 0.15)
    ),
    #1a1630;
  border: 1px solid rgba(124, 77, 255, 0.35);
  box-shadow: 0 10px 25px rgba(124, 77, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.brand .logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: relative;
  z-index: 1;
}

.brand span {
  font-size: 15px;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-4);
}

.nav-links a {
  padding: 8px 12px;
  color: var(--text-dim);
  border-radius: 8px;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--text);
  background: rgba(124, 77, 255, 0.1);
  box-shadow: var(--focus);
  outline: none;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle:focus-visible {
  box-shadow: var(--focus);
  outline: none;
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(15, 15, 24, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.mobile-menu a {
  display: block;
  padding: 14px var(--space-4);
  border-top: 1px solid var(--border);
  color: var(--text-dim);
}

.mobile-menu a:hover,
.mobile-menu a:focus {
  color: var(--text);
  background: rgba(124, 77, 255, 0.08);
  outline: none;
}

/* -------------------- Common UI Components -------------------- */

/* Eyebrow Badge */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(124, 77, 255, 0.12);
  color: var(--text);
  border: 1px solid rgba(124, 77, 255, 0.25);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  transition: transform 120ms ease, box-shadow 160ms ease,
    background 160ms ease, border-color 160ms ease;
  will-change: transform;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.btn-primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent-3));
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px rgba(124, 77, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 14px 36px rgba(124, 77, 255, 0.45);
}

.btn-secondary:hover {
  border-color: rgba(124, 77, 255, 0.4);
  background: linear-gradient(
    180deg,
    rgba(124, 77, 255, 0.12),
    rgba(124, 77, 255, 0.08)
  );
}

/* Cards */
.card {
  position: relative;
  border-radius: var(--radius);
  background: linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.02),
      rgba(255, 255, 255, 0)
    ),
    var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  padding: var(--space-5);
  overflow: hidden;
  transition: border-color 160ms ease, box-shadow 160ms ease,
    transform 120ms ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: -40% -40% auto auto;
  height: 120%;
  width: 120%;
  background: radial-gradient(
    30% 30% at 90% 10%,
    rgba(124, 77, 255, 0.12),
    transparent 60%
  );
  pointer-events: none;
}

.card:hover {
  border-color: rgba(124, 77, 255, 0.35);
  box-shadow: 0 12px 40px rgba(124, 77, 255, 0.18),
    0 10px 30px rgba(0, 0, 0, 0.45);
  transform: translateY(-2px);
}

/* -------------------- Footer -------------------- */
footer {
  border-top: 1px solid var(--border);
  background: #0a0a12;
  padding: var(--space-6) 0;
}

.footer-inner {
  display: grid;
  gap: var(--space-4);
  justify-items: center;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-dim);
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--text);
  outline: none;
  box-shadow: var(--focus);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 40;
  display: none;
}

.back-to-top .btn {
  padding: 10px 12px;
}

/* -------------------- Responsive Design -------------------- */
@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
  .mobile-menu {
    display: none !important;
  }
}

/* -------------------- Reduced Motion -------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn,
  .card,
  .link-card {
    transition: none;
  }
}