/* ===================================================
   MAIN.CSS — VIU Audit Global Design System
   Contains: reset, CSS variables, typography, utilities
   =================================================== */

/* --- Theme Variables (Design Tokens) --- */
:root {
  /* Primary Colors */
  --color-bg-deep:       #070d1a;
  --color-bg-dark:       #0b1325;
  --color-bg-mid:        #0f1c35;
  --color-bg-card:       #131f38;
  --color-bg-card-hover: #182547;

  /* Accents */
  --color-accent:        #00d4c8;
  --color-accent-dim:    rgba(0, 212, 200, 0.15);
  --color-accent-glow:   rgba(0, 212, 200, 0.35);
  --color-accent-gold:   #f0c040;
  --color-accent-gold-dim: rgba(240, 192, 64, 0.15);

  /* Texts */
  --color-text-primary:  #e8f0fe;
  --color-text-secondary:#9fb3d0;
  --color-text-muted:    #5c7499;
  --color-text-inverse:  #070d1a;

  /* Borders */
  --color-border:        rgba(0, 212, 200, 0.12);
  --color-border-strong: rgba(0, 212, 200, 0.28);

  /* Main Gradient */
  --gradient-hero:       linear-gradient(135deg, #070d1a 0%, #0b1a2e 50%, #0d2240 100%);
  --gradient-accent:     linear-gradient(135deg, #00d4c8 0%, #0099ff 100%);
  --gradient-gold:       linear-gradient(135deg, #f0c040 0%, #e08020 100%);
  --gradient-card:       linear-gradient(145deg, #131f38, #0f1c35);

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Typography */
  --font-display: 'Outfit', sans-serif;
  --font-body:    'Inter', sans-serif;

  /* Border radius */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow:  0 0 40px rgba(0, 212, 200, 0.2);
  --shadow-glow-strong: 0 0 60px rgba(0, 212, 200, 0.35);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   280ms ease;
  --transition-slow:   450ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Navbar */
  --navbar-height: 68px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-deep);
  color: var(--color-text-primary);
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

/* --- Layout Container --- */
.container {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--space-xl);
}

/* --- Base Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* --- Text Utilities --- */
.text-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Global Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn--primary {
  background: var(--gradient-accent);
  color: var(--color-text-inverse);
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--color-accent-glow);
  filter: brightness(1.08);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border-strong);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-dim);
  transform: translateY(-2px);
}

.btn--large {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

.btn__arrow {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

.btn__icon {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* --- Section Headers --- */
.section__label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  padding: 0.3rem 0.9rem;
  background: var(--color-accent-dim);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-strong);
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  max-width: 780px;
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin-bottom: var(--space-3xl);
  line-height: 1.75;
}

/* --- General Sections --- */
.section {
  padding-block: var(--space-5xl);
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--navbar-height);
  background: rgba(7, 13, 26, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(7, 13, 26, 0.95);
  border-bottom-color: var(--color-border-strong);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--space-xl);
}

.navbar__logo {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.navbar__logo-viu {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar__logo-audit {
  color: var(--color-text-primary);
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.navbar__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.navbar__link:hover {
  color: var(--color-text-primary);
}

.navbar__cta-btn {
  padding: 0.5rem 1.25rem;
  background: var(--gradient-accent);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  transition: all var(--transition-base);
}

.navbar__cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--color-accent-glow);
  filter: brightness(1.1);
}

.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.navbar__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .container {
    padding-inline: var(--space-lg);
  }

  .navbar__links {
    display: none;
  }

  .navbar__hamburger {
    display: flex;
  }

  .section {
    padding-block: var(--space-4xl);
  }
}