/* ============================================
   TYUE.COM - Design System (Stripe-inspired)
   Version: 1.0
   ============================================ */

/* --- Google Fonts (closest to sohne-var) --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Source+Code+Pro:wght@400;500;700&display=swap');

/* --- CSS Variables --- */
:root {
  /* Primary Colors */
  --color-purple: #533afd;
  --color-purple-hover: #4434d4;
  --color-purple-deep: #2e2b8c;
  --color-purple-light: #b9b9f9;
  --color-purple-mid: #665efd;
  --color-brand-dark: #1c1e54;
  --color-dark-navy: #0d253d;

  /* Accent */
  --color-ruby: #ea2261;
  --color-magenta: #f96bee;
  --color-magenta-light: #ffd7ef;

  /* Text */
  --color-heading: #061b31;
  --color-label: #273951;
  --color-body: #64748d;
  --color-white: #ffffff;

  /* Backgrounds */
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-bg-muted: #f0f4f8;

  /* Status */
  --color-success: #15be53;
  --color-success-text: #108c3d;

  /* Borders */
  --color-border: #e5edf5;
  --color-border-purple: #b9b9f9;
  --color-border-soft-purple: #d6d9fc;

  /* Shadows */
  --shadow-sm: rgba(23,23,23,0.06) 0px 3px 6px;
  --shadow-md: rgba(23,23,23,0.08) 0px 15px 35px;
  --shadow-lg: rgba(50,50,93,0.25) 0px 30px 45px -30px, rgba(0,0,0,0.1) 0px 18px 36px -18px;
  --shadow-xl: rgba(3,3,39,0.25) 0px 14px 21px -14px, rgba(0,0,0,0.1) 0px 8px 17px -8px;

  /* Typography */
  --font-primary: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Source Code Pro', 'SFMono-Regular', Consolas, monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Container */
  --container-max: 1080px;
  --container-padding: 24px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  font-weight: 300;
  line-height: 1.1;
}

h1 { font-size: 3rem; letter-spacing: -0.96px; }
h2 { font-size: 2rem; letter-spacing: -0.64px; }
h3 { font-size: 1.5rem; letter-spacing: -0.26px; }
h4 { font-size: 1.25rem; letter-spacing: -0.2px; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
  line-height: 1.6;
  color: var(--color-body);
}

a {
  color: var(--color-purple);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-purple-hover);
}

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

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

.container-wide {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-heading);
  letter-spacing: -0.4px;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-purple), var(--color-magenta));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-label);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-purple);
  background: rgba(83,58,253,0.06);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 8px 18px;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 400;
  line-height: 1;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-purple);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-purple-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-purple);
  border: 1px solid var(--color-border-purple);
}

.btn-ghost:hover {
  background: rgba(83,58,253,0.05);
  color: var(--color-purple-hover);
}

.btn-dark {
  background: var(--color-heading);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-brand-dark);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 16px;
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: all var(--transition-slow);
}

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

.card-featured {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 400;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.badge-purple {
  background: rgba(83,58,253,0.1);
  color: var(--color-purple);
  border-color: var(--color-border-soft-purple);
}

.badge-success {
  background: rgba(21,190,83,0.15);
  color: var(--color-success-text);
  border-color: rgba(21,190,83,0.3);
}

.badge-ruby {
  background: rgba(234,34,97,0.1);
  color: var(--color-ruby);
  border-color: rgba(234,34,97,0.2);
}

.badge-neutral {
  background: var(--color-bg-soft);
  color: var(--color-label);
  border-color: var(--color-border);
}

/* --- Section styles --- */
.section {
  padding: var(--space-20) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-dark {
  background: var(--color-brand-dark);
  color: var(--color-white);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--color-white);
}

.section-dark p {
  color: rgba(255,255,255,0.72);
}

.section-muted {
  background: var(--color-bg-soft);
}

.section-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: 2rem;
  font-weight: 300;
  color: var(--color-heading);
  letter-spacing: -0.64px;
  line-height: 1.1;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-body);
  max-width: 560px;
  line-height: 1.5;
}

/* --- Grid System --- */
.grid {
  display: grid;
  gap: var(--space-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); }

/* --- Footer --- */
.footer {
  background: var(--color-brand-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--space-16) 0 var(--space-10);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand h3 {
  color: var(--color-white);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255,255,255,0.6);
  max-width: 280px;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: var(--space-2);
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: rgba(255,255,255,0.9);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-label);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 300;
  color: var(--color-heading);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
  appearance: none;
}

.form-input:focus {
  border-color: var(--color-purple);
  box-shadow: 0 0 0 3px rgba(83,58,253,0.1);
}

.form-input::placeholder {
  color: var(--color-body);
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

/* --- Tags / Topics --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--color-label);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.tag:hover {
  background: rgba(83,58,253,0.06);
  border-color: var(--color-border-soft-purple);
  color: var(--color-purple);
}

/* --- Avatar --- */
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-purple), var(--color-magenta));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  font-weight: 500;
  flex-shrink: 0;
}

/* --- Progress Bar --- */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-purple), var(--color-magenta));
  transition: width 0.6s ease;
}

/* --- Separator --- */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-purple { color: var(--color-purple); }
.text-heading { color: var(--color-heading); }
.text-muted { color: var(--color-body); }
.text-sm { font-size: 14px; }
.text-xs { font-size: 12px; }
.text-lg { font-size: 1.1rem; }

.font-medium { font-weight: 400; }
.font-semibold { font-weight: 500; }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.rounded { border-radius: var(--radius-md); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: 9999px; }

.w-full { width: 100%; }
.hidden { display: none; }

/* --- Gradient Text --- */
.gradient-text {
  background: linear-gradient(135deg, var(--color-purple), var(--color-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.animate-fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.mobile-open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: white; border-bottom: 1px solid var(--color-border); padding: var(--space-4); }
  .section { padding: var(--space-12) 0; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-body); }

/* --- Selection --- */
::selection {
  background: rgba(83,58,253,0.15);
  color: var(--color-purple);
}