/* ============================================================
   IVolt LLC — Main Stylesheet
   Conventions:
     --color-*   : palette tokens
     --space-*   : spacing scale (4px base)
     --radius-*  : border-radius tokens
   ============================================================ */

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

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

body {
  font-family: 'Barlow', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { display: block; max-width: 100%; height: auto; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- Design Tokens ---------------------------------- */
:root {
  /* Palette */
  --color-bg          : #0d0f14;
  --color-surface     : #13161d;
  --color-surface-alt : #1a1e28;
  --color-border      : #252a37;
  --color-text        : #d4d8e2;
  --color-text-muted  : #6b7280;
  --color-heading     : #f0f2f8;
  --color-accent      : #00c8ff;
  --color-accent-dim  : #0098c4;
  --color-accent-glow : rgba(0, 200, 255, 0.18);

  /* Spacing (4px base) */
  --space-1  : 0.25rem;
  --space-2  : 0.5rem;
  --space-3  : 0.75rem;
  --space-4  : 1rem;
  --space-6  : 1.5rem;
  --space-8  : 2rem;
  --space-12 : 3rem;
  --space-16 : 4rem;
  --space-24 : 6rem;

  /* Radius */
  --radius-sm : 4px;
  --radius-md : 8px;
  --radius-lg : 14px;

  /* Transitions */
  --transition-fast : 150ms ease;
  --transition-base : 250ms ease;

  /* Layout */
  --container-max : 1200px;
  --nav-height    : 64px;
}

/* ---------- Typography ------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Barlow Condensed', sans-serif;
  color: var(--color-heading);
  letter-spacing: 0.03em;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem,   5vw, 3.5rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 600; }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem);  font-weight: 600; }
h4 { font-size: 1.1rem; font-weight: 600; }

p  { color: var(--color-text); margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

small { font-size: 0.8rem; color: var(--color-text-muted); }

/* ---------- Layout Helpers --------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-24);
}

.section--alt {
  background-color: var(--color-surface);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

/* ============================================================
   NAVIGATION
   Strategy:
   - Desktop (>900px): flex row, dropdowns are position:absolute
   - Mobile (<=900px): hamburger; menu is position:absolute
     anchored to top:100% of the sticky nav bar itself.
     No viewport math. No fixed positioning.
   ============================================================ */

#site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 15, 20, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

/* nav-inner holds the logo+hamburger row — always 64px tall */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  width: 100%;
  padding-inline: var(--space-6);
  max-width: var(--container-max);
  margin-inline: auto;
}

.nav-logo {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.nav-logo span {
  color: var(--color-heading);
}

/* ---------- Desktop menu ----------------------------------- */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-menu > li {
  position: relative;
}

.nav-menu > li > a,
.nav-menu > li > button {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-menu > li > a:hover,
.nav-menu > li > button:hover,
.nav-menu > li > a[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* Tighten at mid widths before hamburger takes over */
@media (min-width: 901px) and (max-width: 1100px) {
  .nav-menu > li > a,
  .nav-menu > li > button {
    padding: var(--space-2) var(--space-2);
    font-size: 0.82rem;
  }
}

/* ---------- Dropdown chevron ------------------------------- */
.nav-menu .has-dropdown > button::after {
  content: '▾';
  font-size: 0.7rem;
  opacity: 0.6;
  margin-left: var(--space-1);
}

/* ---------- Desktop dropdown panel ------------------------- */
.dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  z-index: 200;
}

.dropdown a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  color: var(--color-text);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.dropdown a:hover {
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* Desktop: open via JS class or keyboard focus */
@media (min-width: 901px) {
  .has-dropdown:focus-within .dropdown,
  .has-dropdown.open .dropdown {
    display: block;
  }
}

/* ---------- Hamburger button ------------------------------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   MOBILE NAV  (<=900px)
   The menu panel is position:absolute off #site-nav (sticky).
   top:100% == bottom edge of the nav bar. No pixel math needed.
   ============================================================ */
@media (max-width: 900px) {

  .nav-toggle { display: flex; }

  /* The nav element itself must be the positioning context */
  #site-nav {
    position: sticky; /* keep sticky — do NOT change to relative */
  }

  /* Hide desktop menu; panel will appear below nav bar */
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;          /* flush with bottom of sticky nav bar */
    left: 0;
    right: 0;
    background: #13161d; /* solid — no transparency so content beneath doesn't bleed through */
    border-bottom: 2px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3) var(--space-4) var(--space-6);
    gap: 0;
    overflow-y: auto;
    max-height: calc(100vh - var(--nav-height));
    z-index: 99;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.7);
  }

  .nav-menu.open { display: flex; }

  /* Full-width items */
  .nav-menu > li { width: 100%; }

  .nav-menu > li > a,
  .nav-menu > li > button {
    width: 100%;
    justify-content: flex-start;
    padding: var(--space-3) var(--space-2);
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

  /* Sub-menu: inline, indented, no absolute positioning */
  .dropdown {
    position: static;
    display: none;        /* hidden by default; toggled by .open on parent */
    border: none;
    border-radius: 0;
    background: var(--color-bg);
    box-shadow: none;
    padding: 0;
    min-width: unset;
    width: 100%;
  }

  .has-dropdown.open .dropdown { display: block; }

  .dropdown a {
    padding: var(--space-2) var(--space-6);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-border);
  }

  /* Push chevron to the right edge */
  .nav-menu .has-dropdown > button::after {
    margin-left: auto;
  }
}

/* ---------- Hero ------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--space-24);
  overflow: hidden;
  background: var(--color-bg);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 50%, rgba(0,200,255,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 20% 80%, rgba(0,100,180,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 680px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero-eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.hero h1 { margin-bottom: var(--space-6); }
.hero p  { font-size: 1.1rem; max-width: 520px; margin-bottom: var(--space-8); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

/* ---------- Buttons ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: 'Barlow', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: background var(--transition-base),
              color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-fast);
  text-decoration: none;
}

.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0);    }

.btn-primary {
  background: var(--color-accent);
  color: #000;
  box-shadow: 0 0 0 0 var(--color-accent-glow);
}
.btn-primary:hover {
  background: #33d4ff;
  box-shadow: 0 4px 24px var(--color-accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  background: var(--color-surface-alt);
  color: var(--color-heading);
}

/* ---------- Cards ------------------------------------------ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent-dim);
  box-shadow: 0 8px 40px rgba(0, 200, 255, 0.08);
  transform: translateY(-3px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent-glow);
  border: 1px solid rgba(0, 200, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  font-size: 1.4rem;
}

.card h3 { margin-bottom: var(--space-3); }
.card p  { color: var(--color-text-muted); font-size: 0.9rem; }
.card .btn { margin-top: var(--space-6); }

/* ---------- Section Headers -------------------------------- */
.section-header {
  margin-bottom: var(--space-12);
}

.section-header.centered {
  text-align: center;
  max-width: 620px;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-header h2 { margin-bottom: var(--space-4); }
.section-header p  { color: var(--color-text-muted); font-size: 1rem; }

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

/* ---------- Footer ----------------------------------------- */
#site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--space-4);
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: var(--color-text);
  transition: color var(--transition-fast);
}
.footer-col ul li a:hover { color: var(--color-accent); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-accent); }

/* ---------- Utility ---------------------------------------- */
.text-accent   { color: var(--color-accent); }
.text-muted    { color: var(--color-text-muted); }
.text-center   { text-align: center; }
.mt-auto       { margin-top: auto; }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- Responsive (non-nav) --------------------------- */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .grid-3,
  .grid-2 { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}


/* ============================================================
   Nav Auth Item — Sign In button + authenticated portal dropdown
   ============================================================ */

/* Placeholder li spacing */
.nav-auth-placeholder {
  display: flex;
  align-items: center;
}

/* Sign In button in nav */
.nav-auth-btn {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

/* Authenticated trigger button */
.nav-auth-user-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  white-space: nowrap;
}

.nav-auth-user-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* Online presence dot */
.nav-auth-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
  box-shadow: 0 0 6px var(--color-accent);
}

/* Auth dropdown — wider than standard for meta block */
.dropdown-auth-menu {
  min-width: 220px;
  right: 0;
  left: auto;
}

/* User identity meta block at top of auth dropdown */
.dropdown-meta {
  padding: var(--space-3) var(--space-4) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
  pointer-events: none;
}

.dropdown-meta-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  display: block;
}

.dropdown-meta-type {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
}

/* Separator line */
.dropdown-separator {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
  pointer-events: none;
}

/* Sign out button — matches dropdown link style */
.nav-signout-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  border-radius: var(--radius-sm);
}

.nav-signout-btn:hover {
  color: #f87171;
  background: rgba(248, 113, 113, 0.08);
}