/**
 * Vincenzo Falace - Showcase Website
 * File: assets/css/style.css
 * Description: Global CSS resets, base typography, layout wrappers, grid/flex utilities, and scroll animation styles.
 */

@import url('variables.css');

/* ==========================================
   1. RESET & BASE STYLES
   ========================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  background-color: var(--bg);
  color: var(--text-secondary);
  font-family: var(--font-body);
  line-height: var(--lh-body);
  font-weight: var(--fw-regular);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   2. TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: var(--lh-headings);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tight);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

.text-lead {
  font-size: var(--font-size-lead);
  color: var(--text-secondary);
  line-height: var(--lh-loose);
  font-weight: var(--fw-light);
}

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

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

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

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

.text-accent-tech { color: var(--accent-tech); }
.text-accent-sale { color: var(--accent-sale); }

a {
  color: var(--accent-tech);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-tech-glow);
}

/* ==========================================
   3. LAYOUT & CONTAINERS
   ========================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

section {
  padding-top: var(--space-section-py);
  padding-bottom: var(--space-section-py);
  position: relative;
  overflow-x: hidden;
}

.section-header {
  margin-bottom: var(--space-3xl);
  text-align: center;
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

/* Ambient Glow Backgrounds */
.ambient-glow-top {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 600px;
  background: radial-gradient(circle at top, rgba(0, 235, 248, 0.05) 0%, rgba(255, 10, 159, 0.03) 30%, rgba(11, 15, 25, 0) 70%);
  pointer-events: none;
  z-index: var(--z-negative);
}

.ambient-glow-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 235, 248, 0.03) 0%, rgba(255, 10, 159, 0.03) 50%, rgba(11, 15, 25, 0) 70%);
  pointer-events: none;
  z-index: var(--z-negative);
}

/* ==========================================
   4. NAVIGATION HEADER
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height, 80px);
  background-color: rgba(8, 10, 13, 0.94);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: var(--z-header, 1000);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), height var(--transition-normal);
}

.header.scrolled {
  height: 70px;
  background-color: rgba(8, 10, 13, 0.98);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

/* Standardized Inner Page Hero Header Padding to guarantee perfect clearance */
.page-header-section {
  padding-top: calc(var(--header-height, 80px) + var(--space-3xl));
  padding-bottom: var(--space-xl);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  font-family: var(--font-heading);
  text-decoration: none;
}

.logo-main {
  font-size: 1.35rem;
  font-weight: var(--fw-extrabold);
  color: var(--text-primary);
  letter-spacing: var(--ls-tight);
}

.logo-sub {
  font-size: 0.7rem;
  font-weight: var(--fw-medium);
  color: var(--accent-tech);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
}

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

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: var(--fw-medium);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-tech);
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active::after {
  background: var(--gradient-mixed);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: var(--z-overlay);
}

.nav-toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: background-color var(--transition-normal);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  left: 0;
  transition: transform var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.nav-toggle-icon::before { top: -8px; }
.nav-toggle-icon::after { bottom: -8px; }

/* Active State Mobile Burger */
.nav-toggle.active .nav-toggle-icon {
  background-color: transparent;
}
.nav-toggle.active .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}
.nav-toggle.active .nav-toggle-icon::after {
  transform: rotate(-45deg);
  bottom: 0;
}

/* ==========================================
   5. GRID & FLEX UTILITIES
   ========================================== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

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

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

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.w-full { width: 100%; }

/* ==========================================
   6. SCROLL REVEAL ANIMATIONS
   ========================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.reveal-left {
  transform: translateX(-50px);
}

.reveal.reveal-right {
  transform: translateX(50px);
}

.reveal.reveal-scale {
  transform: scale(0.95);
}

.reveal.active {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Sequential Stagger Animation classes via custom CSS delay */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ==========================================
   7. RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: var(--header-height-mobile);
  }
  
  section {
    padding-top: calc(var(--space-section-py) * 0.7);
    padding-bottom: calc(var(--space-section-py) * 0.7);
  }

  .page-header-section {
    padding-top: calc(var(--header-height, 70px) + var(--space-xl)) !important;
    padding-bottom: var(--space-lg);
  }

  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Hamburger Menu Interactivity */
  .nav-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    right: -100%;
    width: 80%;
    max-width: 350px;
    height: calc(100vh - var(--header-height));
    background-color: rgba(7, 10, 18, 0.95);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--glass-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-2xl) var(--space-xl);
    gap: var(--space-2xl);
    transition: right var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1);
  }

  .nav.active {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    width: 100%;
    gap: var(--space-lg);
  }

  .nav-link {
    font-size: 1.15rem;
    display: block;
    width: 100%;
  }
  
  .nav .btn {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .grid-4 {
    grid-template-columns: 1fr;
  }
}