/* ============================================================
   Lucas Rega Portfolio — Main Stylesheet
   Design: Dark mode, Glassmorphism, Premium feel
   ============================================================ */

/* ── 1. CUSTOM PROPERTIES (Design Tokens) ──────────────────── */
:root {
  /* Colors */
  --bg-primary:    #0b0f17;
  --bg-secondary:  #0e1420;
  --card-bg:       #131a24;
  --card-border:   rgba(79, 140, 255, 0.12);
  --glass-bg:      rgba(19, 26, 36, 0.65);
  --glass-border:  rgba(255, 255, 255, 0.07);
  --accent:        #4f8cff;
  --accent-glow:   rgba(79, 140, 255, 0.25);
  --accent2:       #7f5cff;
  --accent2-glow:  rgba(127, 92, 255, 0.25);
  --gradient:      linear-gradient(135deg, var(--accent), var(--accent2));
  --text-primary:  #f0f4ff;
  --text-secondary:#8b9ab4;
  --text-muted:    #4a5568;
  --success:       #22d3a5;
  --warning:       #f59e0b;

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-pad: 6rem 0;
  --container-w: 1180px;

  /* Transitions */
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast:    0.15s var(--ease);
  --t-normal:  0.3s var(--ease);
  --t-slow:    0.6s var(--ease);

  /* Shadows */
  --shadow-card:   0 4px 24px rgba(0,0,0,0.4);
  --shadow-accent: 0 0 32px var(--accent-glow);
  --shadow-glow:   0 0 60px rgba(79,140,255,0.15);

  /* Border radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 32px;
}

/* ── 2. RESET & BASE ────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none; /* Custom cursor active on desktop */
}

/* Restore cursor on touch devices */
@media (hover: none) {
  body { cursor: auto; }
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul, ol { list-style: none; }
svg { display: block; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 99px; }

/* ── 3. TYPOGRAPHY ──────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 3rem;
}

/* ── 4. LAYOUT ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: var(--section-pad);
  position: relative;
}

section:nth-child(even) {
  background: var(--bg-secondary);
}

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

/* ── 5. CUSTOM CURSOR ───────────────────────────────────────── */
#cursor-dot,
#cursor-ring {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: opacity var(--t-fast);
}

#cursor-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  top: 0; left: 0;
}

#cursor-ring {
  width: 32px;
  height: 32px;
  border: 2px solid rgba(79, 140, 255, 0.5);
  top: 0; left: 0;
  transition: transform 0.12s var(--ease), width var(--t-fast), height var(--t-fast), border-color var(--t-fast);
}

#cursor-ring.is-hovering {
  width: 48px;
  height: 48px;
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* ── 6. LOADING SCREEN ──────────────────────────────────────── */
#loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.5s var(--ease), visibility 0.5s;
}

#loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-logo {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
  animation: pulse 1.5s ease-in-out infinite;
}

.loader-bar {
  width: 200px;
  height: 2px;
  background: var(--card-bg);
  border-radius: 99px;
  overflow: hidden;
}

.loader-bar-fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 99px;
  animation: loadFill 1.5s var(--ease) forwards;
}

@keyframes loadFill {
  from { width: 0%; }
  to   { width: 100%; }
}

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

/* ── 7. SCROLL PROGRESS BAR ─────────────────────────────────── */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient);
  z-index: 9998;
  width: 0%;
  transition: width 0.1s linear;
  box-shadow: var(--shadow-accent);
}

/* ── 8. NAVIGATION ──────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.2rem 0;
  transition: background var(--t-normal), backdrop-filter var(--t-normal), padding var(--t-normal);
}

#navbar.scrolled {
  background: rgba(11, 15, 23, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.4rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background var(--t-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(79, 140, 255, 0.08);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 99px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-btn {
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid var(--card-border);
  border-radius: var(--r-sm);
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--t-fast);
}

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

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  border-radius: var(--r-sm);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 99px;
  transition: all var(--t-normal);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(11, 15, 23, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-normal);
}

.mobile-nav.open {
  display: flex;
  opacity: 1;
  pointer-events: all;
}

.mobile-nav a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: color var(--t-fast);
}

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

/* ── 9. BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--r-md);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--t-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.05);
  opacity: 0;
  transition: opacity var(--t-fast);
}

.btn:hover::before { opacity: 1; }

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

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

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

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

.btn-ghost {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  background: rgba(79,140,255,0.1);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ── 10. HERO SECTION ───────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 8rem 0 4rem;
}

/* Particles canvas */
#particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* Grid background */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(79,140,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,140,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

/* Radial glow */
.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,140,255,0.1) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
}

.hero-text {}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: 99px;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
  animation: fadeInDown 0.8s var(--ease) both;
}

.hero-badge span.dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 400;
  animation: fadeInDown 0.8s 0.1s var(--ease) both;
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInDown 0.8s 0.2s var(--ease) both;
}

.hero-typing-container {
  min-height: 2.2rem;
  margin: 0.75rem 0 1.25rem;
  animation: fadeInDown 0.8s 0.3s var(--ease) both;
}

.hero-typing {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 600;
  color: var(--text-secondary);
}

.hero-typing .cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}

.hero-description {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 2rem;
  animation: fadeInDown 0.8s 0.4s var(--ease) both;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: fadeInDown 0.8s 0.5s var(--ease) both;
}

/* Photo placeholder */
.hero-photo-wrapper {
  flex-shrink: 0;
  animation: fadeInRight 0.8s 0.3s var(--ease) both;
}

.hero-photo {
  width: 280px;
  height: 320px;
  border-radius: var(--r-xl);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--r-xl);
}

.hero-photo-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
}

.hero-photo-placeholder svg {
  width: 60px;
  height: 60px;
  color: var(--text-muted);
}

.hero-photo::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--gradient);
  border-radius: calc(var(--r-xl) + 2px);
  z-index: -1;
  opacity: 0.4;
}

.hero-photo-corner {
  position: absolute;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  border: 2px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
}

.corner-tl { top: -12px; left: -12px; animation: float 3s ease-in-out infinite; }
.corner-tr { top: -12px; right: -12px; animation: float 3s 1s ease-in-out infinite; }
.corner-br { bottom: -12px; right: -12px; animation: float 3s 2s ease-in-out infinite; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

/* ── 11. ABOUT SECTION ──────────────────────────────────────── */
#about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-paragraphs p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.85;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.highlight-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  backdrop-filter: blur(10px);
  transition: all var(--t-normal);
}

.highlight-card:hover {
  border-color: var(--accent);
  background: rgba(79,140,255,0.06);
  transform: translateY(-3px);
}

.highlight-card .icon {
  font-size: 1.6rem;
}

.highlight-card .label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* About visual */
.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-terminal {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 2;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-card);
  position: relative;
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--glass-border);
}

.terminal-linux-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55rem;
  height: 1.2rem;
  border: 1px solid rgba(40, 200, 64, 0.55);
  border-radius: 3px;
  color: var(--success);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1;
}

.terminal-title {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.terminal-line { color: var(--text-secondary); }
.terminal-line .prompt { color: var(--success); }
.terminal-line .cmd { color: var(--text-primary); }
.terminal-line .output { color: var(--accent); }
.terminal-line .comment { color: var(--text-muted); }

/* ── 12. SKILLS SECTION ─────────────────────────────────────── */
.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  transition: all var(--t-normal);
}

.skill-category:hover {
  border-color: rgba(79,140,255,0.3);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(79,140,255,0.1);
  transform: translateY(-4px);
}

.skill-category-name {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--glass-border);
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

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

.skill-name {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.skill-icon { font-size: 1rem; }

.skill-level-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skill-bar {
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: 99px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 99px;
  width: 0%;
  transition: width 1.2s var(--ease);
}

/* ── 13. EXPERIENCE / EDUCATION TIMELINE ────────────────────── */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2), transparent);
}

.timeline-item {
  display: flex;
  gap: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
}

.timeline-dot {
  flex-shrink: 0;
  width: 58px;
  display: flex;
  align-items: flex-start;
  padding-top: 0.25rem;
}

.timeline-dot-inner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
  position: relative;
  z-index: 1;
  margin-left: 22px;
}

.timeline-card {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  transition: all var(--t-normal);
}

.timeline-card:hover {
  border-color: rgba(79,140,255,0.3);
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}

.timeline-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-period {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.25rem 0.65rem;
  border-radius: 99px;
  white-space: nowrap;
}

.timeline-company {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.timeline-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.timeline-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.tag {
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(79,140,255,0.08);
  border: 1px solid rgba(79,140,255,0.15);
  color: var(--accent);
  border-radius: 99px;
}

/* ── 14. CERTIFICATIONS ─────────────────────────────────────── */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  backdrop-filter: blur(10px);
  transition: all var(--t-normal);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.cert-card:hover {
  border-color: var(--accent);
  background: rgba(79,140,255,0.06);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card), var(--shadow-accent);
}

.cert-icon { font-size: 2.2rem; }

.cert-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cert-issuer {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.cert-year {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
}

/* ── 15. PROJECTS ───────────────────────────────────────────── */
.projects-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.4rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--card-border);
  border-radius: 99px;
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--t-fast);
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--t-normal);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: rgba(79,140,255,0.35);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.project-card.hidden {
  display: none;
}

.project-image {
  height: 200px;
  background: linear-gradient(135deg, #131a24 0%, #0e1420 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-image-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.project-image-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.3;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11,15,23,0.8) 0%, transparent 60%);
}

.project-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.project-description {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1.25rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.tech-badge {
  padding: 0.18rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(127,92,255,0.1);
  border: 1px solid rgba(127,92,255,0.2);
  color: var(--accent2);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
}

.project-links {
  display: flex;
  gap: 0.75rem;
}

/* ── 16. CV SECTION ─────────────────────────────────────────── */
#cv {
  background: var(--bg-secondary);
}

.cv-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.cv-description {
  color: var(--text-secondary);
  text-align: center;
  max-width: 500px;
}

.cv-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.cv-preview {
  width: 100%;
  max-width: 800px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-card);
  background: var(--card-bg);
}

.cv-preview iframe {
  width: 100%;
  height: 650px;
  border: none;
  display: block;
}

.cv-no-preview {
  display: none;
  padding: 3rem;
  text-align: center;
  color: var(--text-secondary);
}

/* ── 17. CONTACT SECTION ────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
}

.contact-description {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  backdrop-filter: blur(10px);
  transition: all var(--t-normal);
  color: var(--text-secondary);
}

.contact-link:hover {
  border-color: var(--accent);
  background: rgba(79,140,255,0.06);
  color: var(--text-primary);
  transform: translateX(6px);
}

.contact-link-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-link-text {
  flex: 1;
}

.contact-link-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.contact-link-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Contact card */
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-xl);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
}

.contact-card-emoji {
  font-size: 3rem;
  animation: float 3s ease-in-out infinite;
}

.contact-card-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.contact-card-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ── 18. FOOTER ─────────────────────────────────────────────── */
footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--glass-border);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-year {
  color: var(--accent);
}

/* ── 19. BACK TO TOP ────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px var(--accent-glow);
  z-index: 500;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--t-normal);
  font-size: 1.1rem;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

#back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

/* ── 20. SCROLL REVEAL ANIMATIONS ───────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* Staggered children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.stagger-children.revealed > *:nth-child(1) { opacity: 1; transform: none; transition-delay: 0.05s; }
.stagger-children.revealed > *:nth-child(2) { opacity: 1; transform: none; transition-delay: 0.1s; }
.stagger-children.revealed > *:nth-child(3) { opacity: 1; transform: none; transition-delay: 0.15s; }
.stagger-children.revealed > *:nth-child(4) { opacity: 1; transform: none; transition-delay: 0.2s; }
.stagger-children.revealed > *:nth-child(5) { opacity: 1; transform: none; transition-delay: 0.25s; }
.stagger-children.revealed > *:nth-child(6) { opacity: 1; transform: none; transition-delay: 0.3s; }
.stagger-children.revealed > *:nth-child(7) { opacity: 1; transform: none; transition-delay: 0.35s; }
.stagger-children.revealed > *:nth-child(8) { opacity: 1; transform: none; transition-delay: 0.4s; }

/* ── 21. KEYFRAME ANIMATIONS ────────────────────────────────── */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── 22. RESPONSIVE BREAKPOINTS ─────────────────────────────── */

/* Tablet */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-photo-wrapper {
    order: -1;
    display: flex;
    justify-content: center;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-description { margin: 0 auto 2rem; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --section-pad: 4rem 0;
  }

  .nav-links { display: none; }

  .hamburger { display: flex; }

  .hero-photo {
    width: 200px;
    height: 240px;
  }

  .hero-name {
    font-size: clamp(2.2rem, 10vw, 3rem);
  }

  .timeline::before { left: 16px; }
  .timeline-dot { width: 36px; }
  .timeline-dot-inner { margin-left: 10px; }
  .timeline-item { gap: 1.25rem; }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }

  .skills-categories {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
  }

  .cv-preview iframe {
    height: 400px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .certs-grid {
    grid-template-columns: 1fr;
  }
}

/* ── 23. FOCUS / ACCESSIBILITY ──────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  #cursor-dot, #cursor-ring { display: none; }
  body { cursor: auto; }
}

/* ── 24. SECTION HEADERS ────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

/* ── 25. DIVIDER ────────────────────────────────────────────── */
.gradient-divider {
  width: 60px;
  height: 3px;
  background: var(--gradient);
  border-radius: 99px;
  margin: 0.75rem auto 0;
}