/* ==========================================================================
   PORTFOLIO - style.css
   Modern, minimal personal portfolio - REDESIGNED
   Author: Matej Sulc
   ========================================================================== */

/* ---------- CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* Colors - Light theme */
  --clr-bg:          #f8f9fc;
  --clr-bg-alt:      #ffffff;
  --clr-surface:     #eef1f6;
  --clr-text:        #1e293b;
  --clr-text-muted:  #64748b;
  --clr-heading:     #0f172a;
  --clr-accent:      #6366f1;
  --clr-accent-hover:#4f46e5;
  --clr-accent-light:rgba(99, 102, 241, 0.07);
  --clr-accent-glow: rgba(99, 102, 241, 0.15);
  --clr-border:      rgba(0, 0, 0, 0.06);
  --clr-card:        #ffffff;
  --clr-card-hover:  #fafbff;
  --clr-gradient-1:  #6366f1;
  --clr-gradient-2:  #8b5cf6;
  --clr-gradient-3:  #a78bfa;
  --clr-success:     #10b981;

  /* Typography */
  --ff-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-md:   1.125rem;
  --fs-lg:   1.25rem;
  --fs-xl:   1.5rem;
  --fs-2xl:  2rem;
  --fs-3xl:  2.75rem;
  --fs-4xl:  3.5rem;
  --fs-5xl:  4.5rem;
  --fw-light:    300;
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-extrabold:800;

  /* 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;

  /* Layout */
  --max-width: 1200px;
  --header-h:  76px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.07), 0 4px 12px rgba(0,0,0,0.03);
  --shadow-xl:  0 20px 60px rgba(0,0,0,0.1), 0 8px 20px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 40px var(--clr-accent-glow);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 0 0 1px var(--clr-border);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
  --clr-bg:          #0c0a1d;
  --clr-bg-alt:      #13112a;
  --clr-surface:     #1a1836;
  --clr-text:        #cbd5e1;
  --clr-text-muted:  #8892b0;
  --clr-heading:     #e2e8f0;
  --clr-accent:      #818cf8;
  --clr-accent-hover:#a5b4fc;
  --clr-accent-light:rgba(129, 140, 248, 0.08);
  --clr-accent-glow: rgba(129, 140, 248, 0.12);
  --clr-border:      rgba(255, 255, 255, 0.06);
  --clr-card:        #16142e;
  --clr-card-hover:  #1c1a3a;
  --clr-gradient-1:  #818cf8;
  --clr-gradient-2:  #a78bfa;
  --clr-gradient-3:  #c4b5fd;
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.2);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.25);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.3);
  --shadow-xl:  0 20px 60px rgba(0,0,0,0.4);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.2), 0 0 0 1px var(--clr-border);
}

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

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

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: 1.7;
  color: var(--clr-text);
  background-color: var(--clr-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover { color: var(--clr-accent-hover); }
ul { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

::selection {
  background: var(--clr-accent);
  color: #fff;
}

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

.section {
  padding: var(--space-5xl) 0;
  position: relative;
}

/* ---------- Section Header ---------- */
.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__tag {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  padding: 0.35rem 1rem;
  background: var(--clr-accent-light);
  border: 1px solid var(--clr-accent-glow);
  border-radius: var(--radius-full);
}

.section__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-extrabold);
  color: var(--clr-heading);
  margin-bottom: var(--space-md);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section__subtitle {
  font-size: var(--fs-md);
  color: var(--clr-text-muted);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  z-index: 1000;
  background: transparent;
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(248, 249, 252, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 var(--clr-border);
}

[data-theme="dark"] .header.scrolled {
  background: rgba(12, 10, 29, 0.8);
}

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

.nav__logo {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--clr-heading);
  transition: color var(--transition-fast);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

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

.logo-accent {
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-muted);
  position: relative;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
  color: var(--clr-heading);
  background: var(--clr-accent-light);
}

.nav__link.active {
  color: var(--clr-accent);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.theme-toggle:hover {
  background: var(--clr-accent-light);
  color: var(--clr-accent);
}

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"]  .icon-sun  { display: none; }

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 42px;
  height: 42px;
  z-index: 1001;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.nav__toggle:hover {
  background: var(--clr-accent-light);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--clr-heading);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.hamburger { position: relative; }

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
}

.hamburger::before { top: -6px; }
.hamburger::after  { top:  6px; }

.nav__toggle.active .hamburger { background: transparent; }
.nav__toggle.active .hamburger::before { top: 0; transform: rotate(45deg); }
.nav__toggle.active .hamburger::after  { top: 0; transform: rotate(-45deg); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding-top: var(--header-h);
  overflow: hidden;
}

/* Decorative gradients */
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -15%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--clr-accent-glow) 0%, transparent 65%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 65%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero__container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: var(--space-4xl);
  position: relative;
  z-index: 1;
}

.hero__greeting {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-accent);
  margin-bottom: var(--space-md);
  padding: 0.35rem 1rem;
  background: var(--clr-accent-light);
  border: 1px solid var(--clr-accent-glow);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.hero__title {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-extrabold);
  color: var(--clr-heading);
  line-height: 1.05;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

.hero__title .gradient-text {
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2), var(--clr-gradient-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--fs-xl);
  font-weight: var(--fw-medium);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.01em;
}

.hero__description {
  font-size: var(--fs-base);
  color: var(--clr-text-muted);
  max-width: 480px;
  margin-bottom: var(--space-2xl);
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.hero__socials {
  display: flex;
  gap: var(--space-sm);
}

.hero__socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  transition: all var(--transition-fast);
}

.hero__socials a:hover {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
  background: var(--clr-accent-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Profile Image */
.hero__image-wrapper {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.hero__image-wrapper::before {
  content: '';
  position: absolute;
  inset: -12px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2), var(--clr-gradient-3));
  opacity: 0.2;
  z-index: -1;
  animation: pulseGlow 4s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.15; transform: scale(1); }
  50%      { opacity: 0.25; transform: scale(1.02); }
}

.hero__image-wrapper img {
  width: 100%;
  border-radius: var(--radius-xl);
  object-fit: cover;
  aspect-ratio: 1;
  box-shadow: var(--shadow-xl);
}

/* Scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--clr-text-muted);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.5;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: var(--clr-border);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, var(--clr-gradient-1), var(--clr-gradient-2));
  animation: scrollLine 2.5s ease-in-out infinite;
}

@keyframes scrollLine {
  0%   { top: -100%; }
  50%  { top: 100%; }
  100% { top: 100%; }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  border: none;
  letter-spacing: 0.01em;
}

.btn--primary {
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
  filter: brightness(1.1);
}

.btn--outline {
  background: transparent;
  color: var(--clr-heading);
  border: 1.5px solid var(--clr-border);
  backdrop-filter: blur(4px);
}

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

.btn--small {
  padding: 0.55rem 1.1rem;
  font-size: var(--fs-xs);
  background: var(--clr-bg-alt);
  color: var(--clr-heading);
  border: 1px solid var(--clr-border);
}

.btn--small:hover {
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn--full { width: 100%; }

/* ==========================================================================
   PROJECTS
   ========================================================================== */
.projects {
  background: var(--clr-bg-alt);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.project-card {
  background: var(--clr-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent-glow);
}

.project-card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

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

.project-card:hover .project-card__image img {
  transform: scale(1.06);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.project-card__content {
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
}

.project-card__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--clr-heading);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.project-card__description {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: var(--space-lg);
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  font-size: 0.7rem;
  font-weight: var(--fw-semibold);
  color: var(--clr-accent);
  background: var(--clr-accent-light);
  border: 1px solid var(--clr-accent-glow);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.project-card__testimonial {
  padding: var(--space-md) var(--space-lg);
  background: var(--clr-surface);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--clr-accent);
  position: relative;
}

.project-card__testimonial::before {
  content: '\201E';
  position: absolute;
  top: 0.25rem;
  left: 0.75rem;
  font-size: 2rem;
  color: var(--clr-accent);
  opacity: 0.3;
  font-family: Georgia, serif;
  line-height: 1;
}

.project-card__testimonial p {
  font-size: var(--fs-sm);
  font-style: italic;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-sm);
  line-height: 1.7;
  padding-left: 0.5rem;
}

.project-card__testimonial cite {
  font-size: var(--fs-xs);
  font-style: normal;
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  padding-left: 0.5rem;
}

/* CTA Card */
.projects__cta {
  margin-top: var(--space-3xl);
}

.cta-card {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  background: linear-gradient(135deg, var(--clr-accent-light), var(--clr-surface));
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--clr-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-card h3 {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  color: var(--clr-heading);
  margin-bottom: var(--space-sm);
  position: relative;
  letter-spacing: -0.02em;
}

.cta-card p {
  color: var(--clr-text-muted);
  margin-bottom: var(--space-xl);
  position: relative;
}

/* ==========================================================================
   ABOUT / TIMELINE
   ========================================================================== */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: var(--space-3xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-gradient-1), var(--clr-gradient-2), transparent);
  border-radius: var(--radius-full);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-3xl);
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-3xl) - 6px);
  top: 8px;
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--clr-accent-light), var(--shadow-glow);
}

.timeline__content {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

.timeline__content:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent-glow);
  transform: translateX(4px);
}

.timeline__date {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-accent);
  background: var(--clr-accent-light);
  border: 1px solid var(--clr-accent-glow);
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.timeline__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--clr-heading);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.timeline__subtitle {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
}

.timeline__description {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ==========================================================================
   CERTIFICATES
   ========================================================================== */
.certificates {
  background: var(--clr-bg-alt);
}

.certificates__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.certificate-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  transition: all var(--transition-base);
  position: relative;
  box-shadow: var(--shadow-card);
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
}

.certificate-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--clr-accent-glow);
}

.certificate-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  min-width: 64px;
  background: linear-gradient(135deg, var(--clr-accent-light), var(--clr-surface));
  color: var(--clr-accent);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-accent-glow);
}

.certificate-card__icon svg {
  width: 32px;
  height: 32px;
}

.certificate-card__content {
  flex: 1;
}

.certificate-card__content h3 {
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  color: var(--clr-heading);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.certificate-card__issuer {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-xs);
}

.certificate-card__year {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-sm);
}

.certificate-card__description {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.certificate-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Special Certificate Card */
.certificate-card--special {
  background: linear-gradient(135deg, var(--clr-accent-light), var(--clr-surface));
  border: 1.5px solid var(--clr-accent);
  grid-column: 1 / -1;
}

.certificate-card__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.35rem 0.85rem;
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  color: #ffffff;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.certificate-card__badge svg {
  width: 14px;
  height: 14px;
}

.certificate-card__promo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--clr-card);
  border-radius: var(--radius-sm);
  margin-top: var(--space-md);
  border: 1px solid var(--clr-border);
}

.promo-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text);
}

.promo-code {
  padding: 0.3rem 0.75rem;
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  color: #ffffff;
  font-family: 'Courier New', monospace;
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact__info-center {
  max-width: 740px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
  padding: var(--space-xl) var(--space-lg);
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

.contact-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--clr-accent-glow);
}

.contact-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--clr-accent-light), var(--clr-surface));
  color: var(--clr-accent);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-accent-glow);
}

.contact-card h4 {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: -0.25rem;
}

.contact-card a,
.contact-card p {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-heading);
  transition: color var(--transition-fast);
}

.contact-card a:hover {
  color: var(--clr-accent);
}

/* Contact Socials */
.contact-socials {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--clr-border);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.65rem 1.25rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-muted);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.social-link:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.social-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ==========================================================================
   FAQ SECTION
   ========================================================================== */
.faq {
  background: var(--clr-surface);
}

.faq__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 0;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.faq-item:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent-glow);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-xl);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.faq-item__question:hover {
  background: var(--clr-accent-light);
}

.faq-item__question h3 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  margin: 0;
  line-height: 1.4;
  flex: 1;
}

.faq-item__icon {
  flex-shrink: 0;
  color: var(--clr-accent);
  transition: transform var(--transition-base);
}

.faq-item__question[aria-expanded="true"] .faq-item__icon {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 var(--space-xl);
}

.faq-item__question[aria-expanded="true"] + .faq-item__answer {
  max-height: 500px;
  padding: 0 var(--space-xl) var(--space-xl);
}

.faq-item__answer p {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  line-height: 1.7;
  margin: 0;
}

.faq-item__answer strong {
  color: var(--clr-accent);
  font-weight: var(--fw-semibold);
}

/* ==========================================================================
   COOKIE CONSENT BANNER
   ========================================================================== */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--clr-card);
  border-top: 2px solid var(--clr-accent);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12);
  padding: var(--space-lg) var(--space-md);
  z-index: 9999;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-banner__container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.cookie-banner__content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  flex: 1;
  min-width: 280px;
}

.cookie-banner__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-accent-light);
  color: var(--clr-accent);
  border-radius: var(--radius-md);
}

.cookie-banner__text h3 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  margin: 0 0 var(--space-xs) 0;
}

.cookie-banner__text p {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin: 0;
}

.cookie-banner__actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .cookie-banner__container {
    flex-direction: column;
    align-items: stretch;
  }
  
  .cookie-banner__actions {
    justify-content: stretch;
  }
  
  .cookie-banner__actions button {
    flex: 1;
  }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-border);
  padding: var(--space-3xl) 0 var(--space-xl);
}

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

.footer__brand p {
  color: var(--clr-text-muted);
  font-size: var(--fs-sm);
  margin-top: var(--space-sm);
}

.footer__links h4,
.footer__social h4 {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.footer__links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  transition: all var(--transition-fast);
}

.footer__links a:hover {
  color: var(--clr-accent);
  padding-left: 4px;
}

.footer__social-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__social-links a {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  transition: all var(--transition-fast);
}

.footer__social-links a:hover {
  color: var(--clr-accent);
  padding-left: 4px;
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--clr-border);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--clr-gradient-1), var(--clr-gradient-2));
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-base);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

/* ==========================================================================
   REVEAL ANIMATIONS
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.reveal--delay {
  transition-delay: 0.25s;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
  .hero__container { gap: var(--space-2xl); }
  .hero__title { font-size: var(--fs-4xl); }
  .projects__grid { grid-template-columns: 1fr; }
  .certificates__grid { grid-template-columns: 1fr; }
  .certificate-card--special { grid-column: auto; }

  .contact__info-center {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .footer__content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .section { padding: var(--space-4xl) 0; }
  .section__title { font-size: var(--fs-2xl); }

  /* Nav */
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--clr-bg-alt);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-base);
    z-index: 1000;
    border-left: 1px solid var(--clr-border);
  }

  .nav__menu.open { right: 0; }

  .nav__link {
    font-size: var(--fs-lg);
    padding: 0.75rem 1.5rem;
  }

  .nav__toggle { display: flex; }

  /* Hero */
  .hero {
    min-height: auto;
    padding-top: calc(var(--header-h) + var(--space-2xl));
    padding-bottom: var(--space-3xl);
  }

  .hero__container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content { order: 2; }
  .hero__image { order: 1; }
  .hero__image-wrapper { max-width: 220px; }
  .hero__description { margin: 0 auto var(--space-xl); }
  .hero__actions { justify-content: center; }
  .hero__socials { justify-content: center; }
  .hero__title { font-size: var(--fs-3xl); }
  .hero__scroll-indicator { display: none; }

  /* Timeline */
  .timeline { padding-left: var(--space-2xl); }

  /* Contact socials */
  .contact-socials { flex-wrap: wrap; }

  /* Footer */
  .footer__content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
  .hero__title { font-size: var(--fs-2xl); }
  .hero__subtitle { font-size: var(--fs-lg); }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .certificate-card {
    flex-direction: column;
    padding: var(--space-lg);
  }

  .cta-card { padding: var(--space-2xl) var(--space-md); }

  .social-link span { display: none; }
  .social-link { padding: 0.65rem; }
}

/* ---- Overlay for Mobile Menu ---- */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}