/* ============================================================
   Proxiant — Shared Stylesheet (Light Theme)
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ── Custom Properties ── */
:root {
  /* Core backgrounds */
  --color-bg:           #ffffff;
  --color-bg-alt:       #f8fafc;
  --color-card:         #ffffff;
  --color-nav:          #0f172a;
  --color-footer:       #0f172a;

  /* Borders & dividers */
  --color-border:       #e2e8f0;

  /* Text */
  --color-text:         #0f172a;
  --color-text-sec:     #334155;
  --color-text-muted:   #64748b;
  --color-text-faint:   #94a3b8;

  /* Accent — Indigo */
  --color-accent:         #6366f1;
  --color-accent-hover:   #4f46e5;
  --color-accent-light:   #eef2ff;
  --color-accent-text:    #4338ca;

  /* Semantic */
  --color-green:          #16a34a;
  --color-green-bg:       #f0fdf4;
  --color-amber:          #d97706;
  --color-amber-bg:       #fffbeb;
  --color-red:            #dc2626;
  --color-red-bg:         #fef2f2;

  /* Radius */
  --radius-card:   12px;
  --radius-btn:     8px;
  --radius-badge:   6px;
  --radius-sm:      4px;
  --radius-lg:     16px;

  /* Spacing scale */
  --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;

  /* Type scale */
  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */
  --text-4xl:  2.25rem;    /* 36px */
  --text-5xl:  3rem;       /* 48px */

  /* Shadows — light theme */
  --shadow-card:     0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-sm:       0 1px 4px rgba(0,0,0,0.07);
  --shadow-md:       0 4px 16px rgba(0,0,0,0.09);
  --shadow-lg:       0 8px 32px rgba(0,0,0,0.12);
  --shadow-nav:      0 1px 0 rgba(255,255,255,0.08);
  --shadow-glow:     0 0 40px rgba(99,102,241,0.18);
  --shadow-glow-sm:  0 0 20px rgba(99,102,241,0.12);

  /* Transitions */
  --transition: 0.18s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text-sec);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ── Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ── Section spacing ── */
.section    { padding: var(--space-24) 0; }
.section-sm { padding: var(--space-16) 0; }
.section-xs { padding: var(--space-12) 0; }

/* ── Section backgrounds ── */
.section-white    { background: var(--color-bg); }
.section-alt      { background: var(--color-bg-alt); }
.section-indigo   { background: linear-gradient(135deg, #6366f1 0%, #4f46e5 60%, #7c3aed 100%); }
.section-dark     { background: var(--color-nav); }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p { color: var(--color-text-sec); line-height: 1.7; }

.text-muted  { color: var(--color-text-muted); }
.text-faint  { color: var(--color-text-faint); }
.text-accent { color: var(--color-accent); }
.text-center { text-align: center; }

/* ── Gradient Text ── */
.gradient-text {
  background: linear-gradient(135deg, #6366f1 0%, #7c3aed 60%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px 22px;
  border-radius: var(--radius-btn);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
  white-space: nowrap;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: 0 4px 14px rgba(99,102,241,0.35);
}

.btn-secondary {
  background: #fff;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-secondary:hover {
  background: var(--color-accent-light);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.3);
}
.btn-ghost:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.08);
}

.btn-ghost-dark {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-ghost-dark:hover {
  background: var(--color-accent-light);
}

.btn-white {
  background: #fff;
  color: var(--color-accent);
  border-color: #fff;
}
.btn-white:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
}

.btn-text {
  background: transparent;
  color: var(--color-accent);
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}
.btn-text:hover { color: var(--color-accent-hover); }

.btn-lg { padding: 14px 28px; font-size: var(--text-base); }
.btn-sm { padding: 7px 14px;  font-size: var(--text-xs); }

/* ── Card Component ── */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}
.card:hover {
  box-shadow: var(--shadow-card-hover);
}
.card-body { padding: var(--space-6); }

/* ── Badge / Chip Variants ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-badge);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.5;
}

.badge-green  { background: var(--color-green-bg);  color: var(--color-green); }
.badge-amber  { background: var(--color-amber-bg);  color: var(--color-amber); }
.badge-red    { background: var(--color-red-bg);    color: var(--color-red); }
.badge-indigo { background: var(--color-accent-light); color: var(--color-accent-text); }
.badge-gray   { background: #f1f5f9; color: var(--color-text-muted); }

/* ── Callout Boxes ── */
.callout {
  border-radius: var(--radius-card);
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-sm);
  border-left: 4px solid currentColor;
}
.callout-amber { background: var(--color-amber-bg); color: var(--color-amber); }
.callout-green { background: var(--color-green-bg); color: var(--color-green); }
.callout-red   { background: var(--color-red-bg);   color: var(--color-red); }
.callout-info  { background: var(--color-accent-light); color: var(--color-accent-text); }

/* ── Code Blocks ── */
pre, code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}
pre {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-card);
  padding: var(--space-6);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: 1.6;
  border: 1px solid rgba(255,255,255,0.06);
}
code {
  background: #f1f5f9;
  color: var(--color-accent-text);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  border-radius: 0;
}

/* ── Section headers ── */
.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.section-heading {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  color: var(--color-text);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}
.section-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Grid helpers ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* ── Fade-up animation ── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Stagger delays ── */
.delay-1 { transition-delay: 0.05s; }
.delay-2 { transition-delay: 0.12s; }
.delay-3 { transition-delay: 0.19s; }
.delay-4 { transition-delay: 0.26s; }
.delay-5 { transition-delay: 0.33s; }
.delay-6 { transition-delay: 0.40s; }

/* ============================================================
   NAV — Dark (stays dark on light page)
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-nav);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  height: 64px;
  display: flex;
  align-items: center;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
  color: #fff;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-icon {
  width: 32px;
  height: 32px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}
.nav-link {
  color: #94a3b8;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-btn);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-link.active { color: #fff; }

.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-dropdown-toggle::after {
  content: '';
  display: block;
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.6;
}
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: #1e293b;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-card);
  padding: var(--space-2);
  min-width: 200px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 100;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: block;
  padding: var(--space-2) var(--space-4);
  color: #94a3b8;
  font-size: var(--text-sm);
  border-radius: var(--radius-btn);
  transition: color var(--transition), background var(--transition);
}
.nav-dropdown-menu a:hover { color: #fff; background: rgba(255,255,255,0.06); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: #fff;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Mobile drawer */
.nav-drawer {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  position: absolute;
  top: 64px;
  left: 0; right: 0;
  background: #0f172a;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: var(--space-4) var(--space-6) var(--space-6);
  z-index: 999;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  color: #94a3b8;
  font-size: var(--text-base);
  font-weight: 500;
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: color var(--transition);
}
.nav-drawer a:hover { color: #fff; }
.nav-drawer .drawer-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: var(--space-4);
}

/* ============================================================
   FOOTER — Dark
   ============================================================ */
.footer {
  background: var(--color-footer);
  color: #94a3b8;
  padding: var(--space-20) 0 var(--space-10);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-16);
}
.footer-brand .nav-logo {
  margin-bottom: var(--space-4);
}
.footer-tagline {
  font-size: var(--text-sm);
  color: #64748b;
  line-height: 1.7;
  max-width: 240px;
}
.footer-col h5 {
  color: #f8fafc;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-5);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: var(--text-xs);
}
.footer-col a {
  display: block;
  color: #64748b;
  font-size: var(--text-sm);
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: #f8fafc; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-copy {
  font-size: var(--text-sm);
  color: #475569;
}
.footer-legal {
  display: flex;
  gap: var(--space-6);
}
.footer-legal a {
  font-size: var(--text-sm);
  color: #475569;
  transition: color var(--transition);
}
.footer-legal a:hover { color: #94a3b8; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
}

@media (max-width: 768px) {
  .section { padding: var(--space-16) 0; }
  .section-sm { padding: var(--space-12) 0; }

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

  .nav-links, .nav-actions { display: none; }
  .nav-hamburger { display: flex; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
}