/* ================================================================
   digitalmarketing.fyi — Design System
   Premium dark editorial aesthetic. No templates. No compromises.
   ================================================================ */

/* --- Custom Properties --- */
:root {
  /* Backgrounds */
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-surface-raised: #1e1e1e;
  --color-surface-overlay: rgba(255, 255, 255, 0.04);

  /* Text */
  --color-text: #f5f5f0;
  --color-text-secondary: #b0b0a8;
  --color-text-muted: #6a6a62;

  /* Accent — Electric Lime */
  --color-accent: #e8ff47;
  --color-accent-hover: #d4eb33;
  --color-accent-soft: rgba(232, 255, 71, 0.12);
  --color-accent-text: #0a0a0a;

  /* Borders */
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.18);

  /* Gradients */
  --gradient-hero: radial-gradient(ellipse at 30% 20%, rgba(232, 255, 71, 0.06) 0%, transparent 50%);
  --gradient-card: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-raised) 100%);
  --gradient-cta: linear-gradient(135deg, rgba(232, 255, 71, 0.08) 0%, rgba(232, 255, 71, 0.02) 100%);

  /* Typography */
  --font-display: 'Playfair Display', serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* Fluid Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  --text-3xl: clamp(2.5rem, 1.8rem + 3.5vw, 4.5rem);
  --text-hero: clamp(3rem, 2rem + 5vw, 7rem);

  /* Spacing */
  --space-unit: 8px;
  --space-xs: calc(var(--space-unit) * 1);
  --space-sm: calc(var(--space-unit) * 2);
  --space-md: calc(var(--space-unit) * 3);
  --space-lg: calc(var(--space-unit) * 5);
  --space-xl: calc(var(--space-unit) * 8);
  --space-2xl: calc(var(--space-unit) * 12);
  --space-section: clamp(4rem, 3rem + 5vw, 8rem);

  /* Layout */
  --max-width: 1400px;
  --content-width: 800px;
  --radius: 12px;
  --radius-lg: 20px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
}

h1 {
  font-size: var(--text-hero);
  letter-spacing: -0.03em;
  line-height: 0.95;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
}

h4 { font-size: var(--text-xl); }

p { max-width: 65ch; color: var(--color-text-secondary); }
p + p { margin-top: 1.5em; }

.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 1rem + 2vw, 3rem);
}

.container--narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 1rem + 2vw, 3rem);
}

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

.grid {
  display: grid;
  gap: clamp(1rem, 0.5rem + 2vw, 2rem);
}

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

@media (max-width: 1023px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* --- Header / Navigation --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: all var(--transition);
  background: transparent;
}

header.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

header.header-hidden {
  transform: translateY(-100%);
}

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

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav__links a {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-text);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-xs);
}

.menu-toggle svg { width: 24px; height: 24px; }

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-surface);
  z-index: 1001;
  padding: var(--space-2xl) var(--space-xl);
  transition: right var(--transition-slow);
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu.open { right: 0; }

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-decoration: none;
  display: block;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition);
}

.menu-overlay.active { opacity: 1; }

@media (max-width: 767px) {
  .nav__links { display: none; }
  .menu-toggle { display: block; }
  .mobile-menu { display: flex; }
  .menu-overlay { display: block; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-accent-text);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 255, 71, 0.2);
}

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

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--ghost {
  background: none;
  color: var(--color-accent);
  padding: 0;
  font-weight: 600;
}

.btn--ghost:hover { opacity: 0.8; }

.btn--ghost svg {
  transition: transform var(--transition-fast);
}

.btn--ghost:hover svg {
  transform: translateX(4px);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 100px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero__label {
  animation: fadeSlideUp 0.6s ease-out 0.1s both;
}

.hero__headline {
  margin: var(--space-md) 0 var(--space-lg);
  animation: fadeSlideUp 0.6s ease-out 0.2s both;
}

.hero__headline em {
  font-style: italic;
  color: var(--color-accent);
}

.hero__description {
  font-size: var(--text-lg);
  max-width: 55ch;
  margin-bottom: var(--space-xl);
  animation: fadeSlideUp 0.6s ease-out 0.35s both;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  animation: fadeSlideUp 0.6s ease-out 0.5s both;
}

.hero__stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  animation: fadeSlideUp 0.6s ease-out 0.65s both;
}

.hero__stat-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  line-height: 1;
}

.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

@media (max-width: 767px) {
  .hero__stats {
    flex-wrap: wrap;
    gap: var(--space-lg);
  }
}

/* --- Animations --- */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Breadcrumbs --- */
.breadcrumbs {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-md) 0;
  margin-top: 80px;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs span { color: var(--color-text-secondary); }

/* --- Footer --- */
footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-xl);
}

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

@media (max-width: 767px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

.footer__brand p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-sm);
  max-width: 35ch;
}

.footer__heading {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__links a:hover { color: var(--color-accent); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer__bottom a {
  color: var(--color-text-muted);
}

.footer__bottom a:hover {
  color: var(--color-accent);
}

@media (max-width: 767px) {
  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* --- Utility --- */
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.mt-section { margin-top: var(--space-section); }
.mb-section { margin-bottom: var(--space-section); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }