/* ===================================================================
   Sabarish S Nair — Personal Website
   Dark & Modern Design System
   =================================================================== */

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

:root {
  --bg: #0a0a0b;
  --bg-alt: #0f0f11;
  --bg-card: #141416;
  --bg-card-hover: #1a1a1e;
  --bg-elevated: #1c1c20;
  --border: #222228;
  --border-subtle: #1a1a1e;
  --text: #f0f0f2;
  --text-secondary: #8b8b96;
  --text-tertiary: #5a5a66;
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.1);
  --accent-glow: rgba(0, 212, 255, 0.15);
  --white: #ffffff;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.08);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --space-5xl: 128px;

  --max-w: 1120px;
  --transition: 200ms ease;
  --transition-slow: 400ms ease;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

::selection {
  background: var(--accent);
  color: var(--bg);
}

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

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

.section--alt {
  background: var(--bg-alt);
}

/* --- Section Headers --- */
.section__header {
  margin-bottom: var(--space-3xl);
}

.section__label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text);
}

.section__desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: var(--space-md);
  max-width: 600px;
}

.section__subheader {
  margin-top: var(--space-4xl);
  margin-bottom: var(--space-2xl);
}

.section__subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

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

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

.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.03em;
}

.nav__brand-accent {
  color: var(--accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

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

.nav__link--cta {
  background: var(--accent-dim);
  color: var(--accent);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: all var(--transition);
}

.nav__link--cta:hover {
  background: rgba(0, 212, 255, 0.15);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--accent);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

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

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

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

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__gradient {
  position: absolute;
  top: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); opacity: 0.6; }
  100% { transform: translate(-40px, 40px) scale(1.1); opacity: 1; }
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: var(--space-4xl) 0;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2xl);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--white);
  margin-bottom: var(--space-xl);
  background: linear-gradient(135deg, var(--white) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: var(--space-2xl);
}

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

.hero__links {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-4xl);
}

.hero__social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.hero__social:hover {
  background: var(--bg-card-hover);
  color: var(--accent);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: var(--space-lg);
}

.hero__scroll-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  transition: color var(--transition);
}

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

/* --- About --- */
.about {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3xl);
  align-items: start;
  margin-bottom: var(--space-3xl);
}

.about__avatar {
  position: sticky;
  top: 100px;
}

.about__avatar-img {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  border: 2px solid var(--border);
  filter: grayscale(0%);
  transition: all var(--transition-slow);
}

.about__avatar-img:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
}

.about__lead {
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

.about__text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

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

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

.highlight {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
}

.highlight:hover {
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: var(--shadow-glow);
}

.highlight__number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-xs);
}

.highlight__label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--border), transparent);
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-2xl);
}

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

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-2xl) + 2px);
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  z-index: 1;
}

.timeline__item:first-child .timeline__marker {
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

.timeline__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: all var(--transition);
}

.timeline__card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  background: var(--bg-card-hover);
}

.timeline__date {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
  display: block;
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-xs);
}

.timeline__company {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.timeline__desc {
  font-size: 0.92rem;
  color: var(--text-tertiary);
  line-height: 1.7;
}

/* --- Education --- */
.education-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: all var(--transition);
}

.edu-card:hover {
  border-color: rgba(0, 212, 255, 0.2);
}

.edu-card__degree {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.edu-card__school {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.edu-card__status {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* --- Book --- */
.book {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-bottom: var(--space-4xl);
}

.book__cover {
  width: 260px;
  height: 370px;
  position: relative;
  perspective: 600px;
  margin: 0 auto;
}

.book__cover-front {
  width: 100%;
  height: 100%;
  background: linear-gradient(160deg, #0d1117 0%, #1a1f2e 40%, #0f1923 100%);
  border: 1px solid var(--border);
  border-radius: 4px 12px 12px 4px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg), inset 0 0 60px rgba(0, 212, 255, 0.03);
  transform: rotateY(-5deg);
  transition: transform var(--transition-slow);
}

.book__cover:hover .book__cover-front {
  transform: rotateY(0deg);
}

.book__cover-front::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.book__cover-spine {
  position: absolute;
  left: -4px;
  top: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(90deg, #0a0e14, #131720);
  border-radius: 4px 0 0 4px;
  transform: rotateY(-90deg) translateX(-8px);
  transform-origin: right;
}

.book__cover-series {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-xl);
}

.book__cover-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.book__cover-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-xl);
}

.book__cover-authors {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.book__badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 212, 255, 0.15);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.02em;
}

.book__title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: var(--space-lg);
}

.book__desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.book__actions {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
}

.btn--primary:hover {
  background: #00bfe6;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.3);
}

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

.btn--ghost:hover {
  color: var(--text);
  border-color: var(--text-tertiary);
  background: var(--bg-card);
}

/* --- Series --- */
.series {
  border-top: 1px solid var(--border);
  padding-top: var(--space-2xl);
}

.series__heading {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xl);
}

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

.series__item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  transition: all var(--transition);
}

.series__item:hover {
  border-color: rgba(0, 212, 255, 0.2);
}

.series__item--active {
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.03);
}

.series__num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.series__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.series__tag {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* --- Articles --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
  cursor: pointer;
}

.article-card:hover {
  border-color: rgba(0, 212, 255, 0.25);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.article-card__tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.article-card__date {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.article-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: var(--space-md);
}

.article-card__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: var(--space-lg);
}

.article-card__link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: gap var(--transition);
}

.article-card:hover .article-card__link {
  gap: var(--space-sm);
}

.article-card--cta {
  display: flex;
  align-items: center;
  justify-content: center;
  border-style: dashed;
}

.article-card__cta-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
}

.article-card--cta .article-card__title {
  font-size: 1rem;
  color: var(--text-secondary);
}

.article-card--cta:hover .article-card__title {
  color: var(--text);
}

/* --- Community --- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-2xl);
  transition: all var(--transition);
}

.community-card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  transform: translateY(-2px);
}

.community-card__icon {
  color: var(--accent);
  margin-bottom: var(--space-lg);
}

.community-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.community-card__role {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
}

.community-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Contact --- */
.contact {
  max-width: 600px;
}

.contact__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.contact__desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.contact__links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.contact__link:hover {
  color: var(--accent);
  border-color: rgba(0, 212, 255, 0.3);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.footer__name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.footer__location {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  display: block;
  margin-top: 2px;
}

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

.footer__social {
  color: var(--text-tertiary);
  transition: color var(--transition);
}

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

.footer__copyright {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in--d1 { transition-delay: 0.1s; }
.fade-in--d2 { transition-delay: 0.2s; }
.fade-in--d3 { transition-delay: 0.3s; }
.fade-in--d4 { transition-delay: 0.4s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about__highlights {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .book__content {
    text-align: left;
  }

  .book__cover {
    margin-bottom: var(--space-lg);
  }

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

@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 11, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
  }

  .nav__links--open {
    display: flex;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__link {
    font-size: 1.2rem;
  }

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

  .hero__name {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .section {
    padding: var(--space-4xl) 0;
  }

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

  .about__avatar {
    position: static;
  }

  .about__highlights {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .book__actions {
    flex-direction: column;
  }

  .book__actions .btn {
    justify-content: center;
  }

  .contact__links {
    flex-direction: column;
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

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

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

  .highlight {
    padding: var(--space-lg);
  }

  .highlight__number {
    font-size: 1.5rem;
  }
}