/* ═══════════════════════════════════════════════════════════
   PRINCE KEVIN KARTHIK — PORTFOLIO
   Mild Neobrutalism · CSS Variables · Mobile-First
   ═══════════════════════════════════════════════════════════ */

/* ─── 1. CSS CUSTOM PROPERTIES ────────────────────────────── */
:root {
  /* Palette */
  --col-black:      #0a0a0a;
  --col-white:      #f5f5f0;
  --col-yellow:     #ffd400;
  --col-yellow-dk:  #e6bf00;
  --col-grey-light: #e8e8e3;
  --col-grey-mid:   #b0b0a8;
  --col-grey-dark:  #444440;

  /* Tag category colours */
  --col-tag-lang:   #dbeafe;  /* soft blue  */
  --col-tag-db:     #dcfce7;  /* soft green */
  --col-tag-hw:     #fef3c7;  /* soft amber */

  /* Typography */
  --ff-display: 'Archivo Black', 'Arial Black', sans-serif;
  --ff-body:    'Space Grotesk', 'Segoe UI', system-ui, sans-serif;

  /* Borders (neobrutalism core) */
  --border:       2px solid var(--col-black);
  --border-thick: 3px solid var(--col-black);

  /* Shadows (hard, neobrutalist) */
  --shadow-sm:  3px 3px 0 var(--col-black);
  --shadow-md:  5px 5px 0 var(--col-black);
  --shadow-lg:  8px 8px 0 var(--col-black);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width: 1160px;
  --nav-height: 64px;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-med:  200ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--ff-body);
  background-color: var(--col-white);
  color: var(--col-black);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ─── 3. FOCUS STATES (accessibility) ─────────────────────── */
:focus-visible {
  outline: 3px solid var(--col-yellow);
  outline-offset: 3px;
}

/* ─── 4. UTILITY ───────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.hide-mobile { display: none; }

/* ─── 5. NAVIGATION ────────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--col-white);
  border-bottom: var(--border);
  transition: box-shadow var(--transition-med);
}

.nav-header.scrolled {
  box-shadow: 0 3px 0 var(--col-black);
}

.nav-container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--col-black);
  background-color: var(--col-yellow);
  border: var(--border-thick);
  padding: 2px 10px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.nav-logo:hover {
  box-shadow: 2px 2px 0 var(--col-black);
  transform: translate(1px, 1px);
}

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--col-black);
  transition: transform var(--transition-med), opacity var(--transition-med);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav-menu {
  display: none;
  flex-direction: column;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background-color: var(--col-white);
  border-bottom: var(--border-thick);
  padding: var(--space-sm);
  gap: var(--space-xs);
}

.nav-menu.open { display: flex; }

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 12px;
  border: var(--border);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--col-yellow);
  box-shadow: var(--shadow-sm);
}

.nav-link--cta {
  background-color: var(--col-yellow);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.nav-link--cta:hover {
  box-shadow: 2px 2px 0 var(--col-black);
  transform: translate(1px, 1px);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav-toggle { display: none; }

  .nav-menu {
    display: flex !important;
    flex-direction: row;
    position: static;
    border: none;
    padding: 0;
    gap: var(--space-xs);
    background: none;
  }
}

/* ─── 6. BUTTONS ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-body);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1.4rem;
  border: var(--border-thick);
  cursor: pointer;
  text-align: center;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--col-yellow);
  color: var(--col-black);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  box-shadow: 3px 3px 0 var(--col-black);
  transform: translate(2px, 2px);
}

.btn--primary:active {
  box-shadow: 1px 1px 0 var(--col-black);
  transform: translate(4px, 4px);
}

.btn--outline {
  background-color: transparent;
  color: var(--col-black);
  box-shadow: var(--shadow-md);
}

.btn--outline:hover {
  background-color: var(--col-black);
  color: var(--col-white);
  box-shadow: 3px 3px 0 var(--col-black);
  transform: translate(2px, 2px);
}

.btn--small {
  font-size: 0.85rem;
  padding: 0.45rem 1rem;
}

.btn--large {
  font-size: 1.1rem;
  padding: 0.85rem 2rem;
  box-shadow: var(--shadow-lg);
}

.btn--large:hover {
  box-shadow: 5px 5px 0 var(--col-black);
  transform: translate(3px, 3px);
}

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

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ─── 7. SECTIONS — SHARED ─────────────────────────────────── */
.section {
  padding-block: var(--space-xl);
}

.section--hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.section-label {
  font-family: var(--ff-body);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--col-grey-dark);
  margin-bottom: var(--space-xs);
}

.section-heading {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

/* Alternating section backgrounds */
.section--about   { background-color: var(--col-white); }
.section--projects { background-color: var(--col-grey-light); }
.section--skills  { background-color: var(--col-white); }
.section--contact { background-color: var(--col-grey-light); }
.section--resume  { background-color: var(--col-yellow); border-top: var(--border-thick); border-bottom: var(--border-thick); }

/* ─── 8. HERO ──────────────────────────────────────────────── */
.hero-layout {
  position: relative;
  z-index: 1;
}

/* Two-column split layout */
.hero-layout--split {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  align-items: flex-start;
}

.hero-content {
  flex: 1;
  min-width: 0;
}

/* Photo column */
.hero-photo-wrap {
  position: relative;
  flex-shrink: 0;
  align-self: center;
  width: min(320px, 100%);
  margin-top: var(--space-lg);
}

.hero-photo-frame {
  position: relative;
  border: var(--border-thick);
  box-shadow: 10px 10px 0 var(--col-yellow);
  overflow: hidden;
  background-color: var(--col-grey-light);
  z-index: 1;
}

.hero-photo {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  object-position: top center;
  aspect-ratio: 4 / 5;
}

/* Name tag strip at the bottom of the photo */
.hero-photo-tag {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--col-yellow);
  border-top: var(--border-thick);
  font-family: var(--ff-display);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 12px;
  text-align: center;
}

/* Decorative offset block behind the photo */
.hero-photo-deco {
  position: absolute;
  top: 14px;
  left: 14px;
  width: 100%;
  height: 100%;
  border: var(--border-thick);
  background-color: transparent;
  z-index: 0;
}

/* Desktop: side-by-side */
@media (min-width: 900px) {
  .hero-layout--split {
    flex-direction: row;
    align-items: center;
    gap: var(--space-2xl);
  }

  .hero-photo-wrap {
    width: 340px;
    margin-top: 0;
  }

  .hide-mobile { display: inline; }
}

@media (min-width: 1024px) {
  .hero-photo-wrap { width: 380px; }
  .hero-decoration { display: none; } /* no longer used */
}

.hero-badge {
  display: inline-block;
  background-color: var(--col-yellow);
  border: var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 12px;
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.hero-name {
  font-family: var(--ff-display);
  font-size: clamp(3rem, 10vw, 7rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.hero-name__first { display: block; }

.hero-name__last {
  display: block;
  position: relative;
}

.hero-title {
  font-family: var(--ff-display);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background-color: var(--col-black);
  color: var(--col-yellow);
  display: inline-block;
  padding: 2px 12px;
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--col-grey-dark);
  margin-bottom: var(--space-lg);
  max-width: 560px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

/* Hero stats */
.hero-stat-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  border-top: var(--border);
  padding-top: var(--space-md);
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat__number {
  font-family: var(--ff-display);
  font-size: 1.6rem;
  line-height: 1;
}

.hero-stat__label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--col-grey-dark);
  margin-top: 2px;
}

.hero-stat-divider {
  width: 2px;
  height: 40px;
  background-color: var(--col-black);
}

/* Hero decorative blocks */
.hero-decoration {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  pointer-events: none;
}

.deco-block {
  width: 180px;
  height: 180px;
  border: var(--border-thick);
  position: absolute;
}

.deco-block--yellow {
  background-color: var(--col-yellow);
  top: -60px;
  right: 40px;
  box-shadow: var(--shadow-lg);
}

.deco-block--outline {
  background-color: transparent;
  top: 20px;
  right: -20px;
}

@media (min-width: 1024px) {
  .hero-decoration { display: block; }
  .hide-mobile { display: inline; }
}

/* ─── 9. ABOUT ─────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 340px;
  }
}

.about-bio {
  font-size: 1.05rem;
  color: var(--col-grey-dark);
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.about-bio strong { color: var(--col-black); }

.about-achievement {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  background-color: var(--col-yellow);
  border: var(--border-thick);
  padding: var(--space-md);
  box-shadow: var(--shadow-md);
  margin-top: var(--space-md);
}

.achievement-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.achievement-text {
  font-size: 0.95rem;
  line-height: 1.5;
}

.achievement-text span {
  font-size: 0.85rem;
  color: var(--col-grey-dark);
}

/* Info card */
.info-card {
  border: var(--border-thick);
  background-color: var(--col-white);
  box-shadow: var(--shadow-md);
  padding: var(--space-md);
}

.info-card__title {
  font-family: var(--ff-display);
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: var(--border);
  padding-bottom: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.info-list { display: flex; flex-direction: column; gap: 10px; }

.info-list__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--col-grey-light);
}

.info-list__item:last-child { border-bottom: none; padding-bottom: 0; }

.info-list__key {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--col-grey-mid);
}

.info-list__val {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--col-black);
}

.info-list__val.highlight {
  font-family: var(--ff-display);
  font-size: 1.1rem;
  color: var(--col-black);
  background-color: var(--col-yellow);
  display: inline-block;
  padding: 0 6px;
}

/* ─── 10. PROJECTS ─────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

.project-card {
  background-color: var(--col-white);
  border: var(--border-thick);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translate(-2px, -2px);
}

.project-card__accent {
  height: 6px;
  background-color: var(--col-black);
  border-bottom: var(--border);
}

.project-card__accent--yellow {
  background-color: var(--col-yellow);
}

.project-card__body {
  padding: var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-number {
  font-family: var(--ff-display);
  font-size: 2.5rem;
  color: var(--col-grey-light);
  line-height: 1;
  margin-bottom: var(--space-xs);
  user-select: none;
}

.project-card__title {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 4px;
}

.project-card__subtitle {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--col-grey-dark);
  margin-bottom: var(--space-sm);
  border-bottom: var(--border);
  padding-bottom: var(--space-sm);
}

.project-card__desc {
  font-size: 0.95rem;
  color: var(--col-grey-dark);
  line-height: 1.65;
  margin-bottom: var(--space-md);
  flex: 1;
}

/* Tech tags within project cards */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-md);
}

.tag {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border: var(--border);
  background-color: var(--col-yellow);
  letter-spacing: 0.04em;
}

.project-card__actions { margin-top: auto; }

/* ─── 11. SKILLS ───────────────────────────────────────────── */
.skills-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.skill-group__title {
  font-family: var(--ff-display);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
  padding-left: 10px;
  border-left: 4px solid var(--col-yellow);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.92rem;
  font-weight: 700;
  padding: 8px 18px;
  border: var(--border-thick);
  box-shadow: var(--shadow-sm);
  cursor: default;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  letter-spacing: 0.02em;
}

.skill-tag:hover {
  box-shadow: var(--shadow-md);
  transform: translate(-2px, -2px);
}

.skill-tag--lang { background-color: var(--col-tag-lang); }
.skill-tag--db   { background-color: var(--col-tag-db);   }
.skill-tag--hw   { background-color: var(--col-tag-hw);   }

/* ─── 12. CONTACT ──────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .contact-grid { grid-template-columns: 1fr 1fr; }
}

.contact-intro {
  font-size: 1.05rem;
  color: var(--col-grey-dark);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

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

.contact-link-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
}

.contact-link-icon {
  font-size: 1.1rem;
  width: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.contact-link {
  border-bottom: 2px solid var(--col-yellow);
  padding-bottom: 1px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  word-break: break-all;
}

.contact-link:hover {
  background-color: var(--col-yellow);
  border-color: transparent;
  padding-inline: 3px;
}

/* Form */
.contact-form {
  background-color: var(--col-white);
  border: var(--border-thick);
  box-shadow: var(--shadow-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-input {
  font-family: var(--ff-body);
  font-size: 0.95rem;
  padding: 10px 12px;
  border: var(--border-thick);
  background-color: var(--col-white);
  color: var(--col-black);
  width: 100%;
  transition: box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus {
  box-shadow: var(--shadow-sm);
  outline: 3px solid var(--col-yellow);
  outline-offset: 0;
}

.form-input.error {
  border-color: #dc2626;
  box-shadow: 3px 3px 0 #dc2626;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  font-size: 0.82rem;
  font-weight: 600;
  color: #dc2626;
  min-height: 1.2em;
}

.form-success {
  background-color: #dcfce7;
  border: var(--border);
  padding: 10px 14px;
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
}

/* ─── 13. RESUME ───────────────────────────────────────────── */
.resume-container {
  text-align: center;
}

.resume-desc {
  font-size: 1.05rem;
  color: var(--col-black);
  opacity: 0.75;
  margin-bottom: var(--space-lg);
  max-width: 480px;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
}

.section--resume .section-label { color: var(--col-black); opacity: 0.6; }
.section--resume .section-heading { color: var(--col-black); }

.section--resume .btn--primary {
  background-color: var(--col-black);
  color: var(--col-yellow);
  border-color: var(--col-black);
  box-shadow: var(--shadow-lg);
}

.section--resume .btn--primary:hover {
  background-color: var(--col-black);
  box-shadow: 5px 5px 0 rgba(0,0,0,0.4);
}

/* ─── 14. FOOTER ───────────────────────────────────────────── */
.footer {
  background-color: var(--col-black);
  color: var(--col-white);
  padding-block: var(--space-md);
  border-top: var(--border-thick);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--col-grey-mid);
}

.footer-back {
  font-size: 0.88rem;
  font-weight: 700;
  background-color: var(--col-yellow);
  color: var(--col-black);
  border: var(--border);
  padding: 4px 12px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.footer-back:hover {
  box-shadow: 2px 2px 0 var(--col-white);
  transform: translate(1px, 1px);
}

/* ─── 15. SCROLL-REVEAL UTILITY ────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 400ms ease, transform 400ms ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ─── 16. ACTIVE NAV LINK ──────────────────────────────────── */
.nav-link.active {
  background-color: var(--col-yellow);
  box-shadow: var(--shadow-sm);
}