/**
 * Vero Fide - Main Stylesheet
 * Dark theme, minimal, premium. CSS variables for easy customization.
 */

/* ========== CSS Variables ========== */
:root {
  /* Colors - dark palette */
  --color-bg: #0a0b0d;
  --color-bg-elevated: #111215;
  --color-bg-card: #16181c;
  --color-bg-card-hover: #1c1e24;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-accent: rgba(255, 255, 255, 0.12);
  --color-text: #e8eaed;
  --color-text-muted: #9ca3af;
  --color-text-dim: #6b7280;
  --color-accent: #60a5fa;
  --color-accent-dim: rgba(96, 165, 250, 0.15);
  --color-accent-glow: rgba(96, 165, 250, 0.25);
  --color-success: #34d399;
  --color-success-dim: rgba(52, 211, 153, 0.15);

  /* Typography */
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* 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;

  /* Layout */
  --container-max: 72rem;
  --container-padding: 1.5rem;
  --header-height: 4rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
  }
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ========== Layout ========== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ========== Header ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 11, 13, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.header__logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

/* Navigation */
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

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

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

.nav__link--active {
  font-weight: 600;
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  color: var(--color-text);
}

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .nav__link {
    font-size: 1rem;
  }
}

@media (min-width: 769px) {
  .nav {
    display: block;
  }
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-height) + var(--space-4xl)) var(--container-padding) var(--space-4xl);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, var(--color-accent-dim) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(96, 165, 250, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: 42rem;
  text-align: center;
}

.hero__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  background: linear-gradient(180deg, var(--color-text) 0%, var(--color-text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__text {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-line {
  display: block;
  width: 1px;
  height: 3rem;
  background: linear-gradient(to bottom, var(--color-border-accent), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__scroll-line {
    animation: none;
  }
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0b0d;
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.btn--primary:hover {
  background: #7ab8ff;
  box-shadow: 0 0 30px var(--color-accent-glow);
  transform: translateY(-1px);
}

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

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

.btn--large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ========== Sections ========== */
.section {
  padding: var(--space-4xl) 0;
}

.section__header {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto var(--space-3xl);
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ========== Reveal animation base ========== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .reveal.revealed {
    opacity: 1;
    transform: none;
  }
}

/* ========== Projects ========== */
.section--projects {
  background: var(--color-bg-elevated);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  display: block;
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.project-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card__icon {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.project-card__title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.project-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.project-card__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

.project-card:hover .project-card__link {
  transform: translateX(4px);
}

/* ========== Services ========== */
.section--services {
  background: var(--color-bg);
}

.services-badge {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-success);
  background: var(--color-success-dim);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: var(--radius-sm);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.service-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  position: relative;
  transition: all var(--transition-base);
}

.service-card:hover {
  border-color: var(--color-border-accent);
  background: var(--color-bg-card-hover);
}

.service-card__badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.service-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.service-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ========== About ========== */
.section--about {
  background: var(--color-bg-elevated);
}

.about__inner {
  max-width: 40rem;
  margin: 0 auto;
}

.about__content {
  margin-top: var(--space-xl);
}

.about__text {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  line-height: 1.75;
}

.about__text strong {
  color: var(--color-text);
}

/* ========== Contact ========== */
.section--contact {
  background: var(--color-bg);
}

.contact__inner {
  text-align: center;
  max-width: 32rem;
  margin: 0 auto;
}

.contact__text {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

.contact__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.contact__note {
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

/* ========== Footer ========== */
.footer {
  padding: var(--space-2xl) var(--container-padding);
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.footer__logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.footer__tagline {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer__nav a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.footer__copy {
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

/* ========== Stagger delays for reveal ========== */
.reveal:nth-child(1) { transition-delay: 0ms; }
.reveal:nth-child(2) { transition-delay: 80ms; }
.reveal:nth-child(3) { transition-delay: 160ms; }
.reveal:nth-child(4) { transition-delay: 240ms; }
.reveal:nth-child(5) { transition-delay: 320ms; }
.reveal:nth-child(6) { transition-delay: 400ms; }
.reveal:nth-child(7) { transition-delay: 480ms; }
.reveal:nth-child(8) { transition-delay: 560ms; }
.reveal:nth-child(9) { transition-delay: 640ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal:nth-child(n) {
    transition-delay: 0ms;
  }
}