/* ============================================
   CV Portfolio — Waren Jourdren / GothamDev
   Design premium sombre — Apple / Tesla inspired
   ============================================ */

/* --- Variables CSS --- */
:root {
  --color-bg: #0a0a0b;
  --color-bg-secondary: #111113;
  --color-bg-card: #16161a;
  --color-bg-card-hover: #1c1c22;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(0, 122, 255, 0.4);
  --color-text: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-muted: #6e6e73;
  --color-accent: #007aff;
  --color-accent-light: #409cff;
  --color-accent-glow: rgba(0, 122, 255, 0.25);
  --color-white: #ffffff;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', 'Inter', sans-serif;
  --header-height: 72px;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px var(--color-accent-glow);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  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;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul {
  list-style: none;
}

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

input,
textarea {
  font-family: inherit;
  font-size: inherit;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Typography --- */
.section__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section__header {
  text-align: center;
  margin-bottom: 56px;
}

.section {
  padding: 100px 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

.btn--primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--color-accent-glow);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
  backdrop-filter: blur(10px);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

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

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

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

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(10, 10, 11, 0.95);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 0.9375rem;
}

.nav__logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #0056b3);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-white);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}

.nav__link--cta {
  background: var(--color-accent);
  color: var(--color-white) !important;
  margin-left: 8px;
}

.nav__link--cta:hover {
  background: var(--color-accent-light);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

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

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 122, 255, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 122, 255, 0.08), transparent);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 60px 24px 80px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent-light);
  background: rgba(0, 122, 255, 0.1);
  border: 1px solid rgba(0, 122, 255, 0.2);
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero__badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

.hero__title {
  margin-bottom: 16px;
}

.hero__name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.hero__subtitle .dot {
  color: var(--color-accent);
  margin: 0 4px;
}

.hero__description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero__description strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 60px;
}

.hero__scroll {
  margin-top: 20px;
}

.hero__scroll-link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.hero__scroll-link svg {
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* --- Stats --- */
.stats {
  padding: 60px 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 24px 16px;
}

.stat-card__number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.stat-card__suffix {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-accent);
}

.stat-card__label {
  margin-top: 8px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 60px;
  align-items: start;
}

.about__text {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

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

.about__highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.about__highlight {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.about__highlight:hover {
  border-color: var(--color-border-hover);
  transform: translateX(4px);
}

.about__highlight-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.about__highlight strong {
  display: block;
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.about__highlight p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.about__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.about__avatar {
  width: 100px;
  height: 100px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--color-accent), #0056b3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-white);
  box-shadow: var(--shadow-glow);
}

.about__card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.about__card > p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.about__info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.about__info-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.about__info-item svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.about__qr {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.about__qr img {
  margin: 0 auto 8px;
  border-radius: var(--radius-sm);
}

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

/* --- Skills --- */
.skills {
  background: var(--color-bg-secondary);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.skill-card {
  position: relative;
  padding: 32px 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

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

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

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

.skill-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 122, 255, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.skill-card__icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.skill-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-border));
}

.timeline__item {
  position: relative;
  margin-bottom: 40px;
}

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

.timeline__marker {
  position: absolute;
  left: -40px;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.timeline__content {
  padding: 28px 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.timeline__content:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card);
}

.timeline__header {
  margin-bottom: 16px;
}

.timeline__header h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline__role {
  display: block;
  font-size: 0.875rem;
  color: var(--color-accent-light);
  margin-bottom: 4px;
}

.timeline__date {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.timeline__missions {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.timeline__missions li {
  position: relative;
  padding-left: 16px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.timeline__missions li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.6;
}

/* --- Technologies --- */
.tech {
  background: var(--color-bg-secondary);
}

.tech__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  transition: all var(--transition);
  cursor: default;
}

.badge:hover {
  color: var(--color-accent-light);
  border-color: var(--color-border-hover);
  background: rgba(0, 122, 255, 0.08);
  transform: translateY(-2px);
}

/* --- Projects --- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.project-card {
  position: relative;
  padding: 32px 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

.project-card__glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.project-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

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

.project-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: gap var(--transition);
}

.project-card__link:hover {
  gap: 10px;
}

/* --- Education --- */
.education__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.education__block .section__header {
  text-align: left;
  margin-bottom: 32px;
}

.education__items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.education__item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.education__item:hover {
  border-color: var(--color-border-hover);
}

.education__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 122, 255, 0.1);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.education__icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.education__item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.education__item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Languages --- */
.languages {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.language__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.language__name {
  font-weight: 600;
  font-size: 0.9375rem;
}

.language__level {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.language__bar {
  height: 6px;
  background: var(--color-bg-card);
  border-radius: 100px;
  overflow: hidden;
}

.language__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: 100px;
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact__intro {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.contact__detail {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

a.contact__detail:hover {
  border-color: var(--color-border-hover);
  transform: translateX(4px);
}

.contact__detail-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 122, 255, 0.1);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.contact__detail-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.contact__detail-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.contact__detail-value {
  font-size: 0.9375rem;
  font-weight: 500;
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- Form --- */
.contact__form {
  padding: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.form__group {
  margin-bottom: 20px;
}

.form__group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-secondary);
}

.form__group input,
.form__group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: all var(--transition);
  resize: vertical;
}

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--color-text-muted);
}

.form__group input:focus,
.form__group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form__group input.error,
.form__group textarea.error {
  border-color: #ff3b30;
}

.form__status {
  margin-top: 16px;
  font-size: 0.875rem;
  text-align: center;
  min-height: 20px;
}

.form__status.success {
  color: #34c759;
}

.form__status.error {
  color: #ff3b30;
}

/* --- Footer --- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.footer__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer__brand p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

/* --- Back to top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  box-shadow: 0 4px 16px var(--color-accent-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--color-accent-light);
  transform: translateY(-4px);
}

/* --- Reveal animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger children animation delay */
.skills__grid .reveal:nth-child(2) { transition-delay: 0.05s; }
.skills__grid .reveal:nth-child(3) { transition-delay: 0.1s; }
.skills__grid .reveal:nth-child(4) { transition-delay: 0.15s; }
.skills__grid .reveal:nth-child(5) { transition-delay: 0.2s; }
.skills__grid .reveal:nth-child(6) { transition-delay: 0.25s; }
.projects__grid .reveal:nth-child(2) { transition-delay: 0.05s; }
.projects__grid .reveal:nth-child(3) { transition-delay: 0.1s; }
.projects__grid .reveal:nth-child(4) { transition-delay: 0.15s; }

/* --- Print styles --- */
@media print {
  .header,
  .nav__toggle,
  .hero__scroll,
  .back-to-top,
  .contact__form,
  .hero__actions,
  .contact__actions {
    display: none !important;
  }

  body {
    background: white;
    color: black;
    font-size: 12pt;
  }

  .hero {
    min-height: auto;
    padding: 20px 0;
  }

  .hero__name {
    -webkit-text-fill-color: black;
    color: black;
  }

  .section {
    padding: 30px 0;
    break-inside: avoid;
  }

  .skill-card,
  .project-card,
  .timeline__content {
    break-inside: avoid;
    border: 1px solid #ddd;
    box-shadow: none;
  }

  a {
    color: black;
    text-decoration: underline;
  }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about__visual {
    max-width: 400px;
    margin: 0 auto;
  }

  .education__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    padding: calc(var(--header-height) + 24px) 24px 24px;
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    transition: right var(--transition);
    gap: 4px;
  }

  .nav__menu.active {
    right: 0;
  }

  .nav__link {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav__link--cta {
    margin-left: 0;
    margin-top: 12px;
    text-align: center;
  }

  .nav__toggle {
    display: flex;
  }

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-card {
    padding: 16px 8px;
  }

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

  .hero__actions .btn {
    width: 100%;
    max-width: 300px;
  }

  .timeline {
    padding-left: 32px;
  }

  .timeline__marker {
    left: -32px;
  }

  .timeline__content {
    padding: 20px;
  }

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

  .contact__form {
    padding: 28px 24px;
  }

  .footer__content {
    flex-direction: column;
    text-align: center;
  }

  .footer__brand {
    flex-direction: column;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

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

  .nav__logo-text {
    display: none;
  }

  .skills__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }
}