/* ============================================
   SHUBALAKSHMI SHEKAR — PORTFOLIO
   Design System & Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg: #FAFAF8;
  --color-bg-alt: #F3F1ED;
  --color-text: #2C2C2C;
  --color-text-light: #6B6B6B;
  --color-text-muted: #999999;
  --color-accent: #8B7355;
  --color-border: #E0DCD5;
  --color-white: #FFFFFF;
  --color-overlay: rgba(0, 0, 0, 0.45);

  /* Typography */
  --font-heading: 'Cormorant Garamond', 'Georgia', serif;
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 300;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  letter-spacing: 0.01em;
}

h3 {
  font-size: clamp(1.3rem, 2vw, 1.8rem);
}

h4 {
  font-family: var(--font-body);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
}

p {
  margin-bottom: 1.2em;
  font-size: 1rem;
  color: var(--color-text);
}

p:last-child {
  margin-bottom: 0;
}

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

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

.divider {
  width: 100%;
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-lg) 0;
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 var(--space-md);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header--transparent {
  background-color: transparent;
}

.header--solid {
  background-color: var(--color-bg);
  box-shadow: 0 1px 0 var(--color-border);
}

.header__logo a {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
}

.header__logo a:hover {
  opacity: 0.7;
}

.header--transparent .header__logo a,
.header--transparent .nav__link,
.header--transparent .nav__toggle span {
  color: var(--color-white);
}

.header--transparent .nav__toggle span {
  background-color: var(--color-white);
}

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

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

.nav__link {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 400;
  transition: opacity var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  opacity: 0.6;
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background-color: currentColor;
}

/* Projects dropdown */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  min-width: 260px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  z-index: 100;
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown--open .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-item {
  display: block;
  padding: 0.75rem 1.25rem;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  transition: background-color var(--transition-fast);
  color: var(--color-text);
}

.nav__dropdown-item:hover {
  background-color: var(--color-bg-alt);
}

.nav__dropdown-item--sub {
  padding-left: 2.25rem;
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.nav__dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0.25rem 0;
}

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

.nav__toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
}

.nav__toggle--active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

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

.nav__toggle--active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* Mobile nav overlay */
.nav__mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 1001;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
}

.nav__mobile--open {
  display: flex;
}

.nav__mobile a {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 300;
  transition: opacity var(--transition-fast);
}

.nav__mobile a:hover {
  opacity: 0.6;
}

.nav__mobile-sub {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding-left: var(--space-sm);
}

.nav__mobile-sub a {
  font-size: 1.2rem;
  color: var(--color-text-light);
}

.nav__mobile-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
  padding: 8px;
}

/* --- Landing Page Hero --- */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #1a1a1a;
}

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

.hero__bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.5s ease;
}

.hero__bg img.hero__bg--active {
  opacity: 1;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-white);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1.15;
}

.hero__subtitle {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.8);
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--color-white);
  opacity: 0.6;
  animation: scrollBounce 2s infinite;
}

.hero__scroll svg {
  width: 24px;
  height: 24px;
}

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

/* --- Bio Page --- */
.bio {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-xl);
  align-items: center;
  padding-top: calc(var(--header-height) + var(--space-xl));
}

.bio__image img {
  width: 100%;
  object-fit: cover;
}

.bio__content h1 {
  margin-bottom: var(--space-md);
}

.bio__content p {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--color-text);
}

/* --- CV Page --- */
.cv-section {
  margin-bottom: var(--space-lg);
}

.cv-section h3 {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.cv-entry {
  margin-bottom: var(--space-md);
}

.cv-entry__year {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.cv-entry__title {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.cv-entry__detail {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* --- Landing Page Intro --- */
.intro {
  text-align: center;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding-bottom: var(--space-md);
}

.intro h2 {
  margin-bottom: var(--space-sm);
}

.intro p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-light);
}

/* --- Projects Index --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  padding-top: var(--space-md);
}

.project-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

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

.project-card:hover img {
  transform: scale(1.03);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: var(--space-md);
  transition: background var(--transition-base);
}

.project-card:hover .project-card__overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.1) 100%);
}

.project-card__title {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  font-weight: 300;
}

.project-card__subtitle {
  color: rgba(255,255,255,0.75);
  font-size: 0.8rem;
  margin-top: 0.25rem;
  letter-spacing: 0.04em;
}

/* --- Project Page Content --- */
.project-content {
  padding-top: calc(var(--header-height) + var(--space-lg));
}

.project-header {
  text-align: center;
  margin-bottom: var(--space-lg);
  padding: 0 var(--space-md);
}

.project-header h1 {
  margin-bottom: var(--space-sm);
}

.project-header .tagline {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-text-light);
  font-style: italic;
}

.project-text {
  max-width: var(--max-width-narrow);
  margin: 0 auto var(--space-lg);
  padding: 0 var(--space-md);
}

.project-text p {
  font-size: 1.05rem;
  line-height: 1.85;
}

.project-text--personal {
  border-left: 2px solid var(--color-accent);
  padding-left: var(--space-md);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.project-text--personal p {
  font-style: italic;
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.8;
}

.project-text--personal .signature {
  font-style: normal;
  font-weight: 500;
  margin-top: var(--space-sm);
  color: var(--color-text);
}

/* --- Image Gallery --- */
.gallery {
  max-width: var(--max-width);
  margin: 0 auto var(--space-lg);
  padding: 0 var(--space-md);
}

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

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

.gallery__item {
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

.gallery__item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.gallery__item:hover img {
  transform: scale(1.03);
}

/* Full width image */
.full-image {
  max-width: var(--max-width);
  margin: var(--space-lg) auto;
  padding: 0 var(--space-md);
}

.full-image img {
  width: 100%;
  max-height: 55vh;
  object-fit: cover;
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.92);
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox--open {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.lightbox__close:hover {
  opacity: 1;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 2rem;
  cursor: pointer;
  padding: 16px;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.lightbox__nav:hover {
  opacity: 1;
}

.lightbox__nav--prev {
  left: var(--space-md);
}

.lightbox__nav--next {
  right: var(--space-md);
}

/* --- Food Gatherings Sub-navigation --- */
.sub-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.sub-nav__link {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  color: var(--color-text-light);
}

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

/* --- Sub-section on Food Gatherings Page --- */
.sub-section {
  margin-bottom: var(--space-2xl);
  scroll-margin-top: calc(var(--header-height) + var(--space-md));
}

.sub-section__header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.sub-section__header h2 {
  margin-bottom: var(--space-xs);
}

/* --- Contact Page --- */
.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact__info h1,
.contact__info h2 {
  margin-bottom: var(--space-md);
}

.contact__info p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-light);
}

.contact__links {
  margin-top: var(--space-md);
}

.contact__links a {
  display: inline-block;
  margin-right: var(--space-md);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  transition: border-color var(--transition-fast);
}

.contact__links a:hover {
  border-color: var(--color-text);
}

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

.form-group label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
  color: var(--color-text-light);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
  -webkit-appearance: none;
  border-radius: 0;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.btn {
  display: inline-block;
  padding: 0.85rem 2.5rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-base);
  align-self: flex-start;
}

.btn:hover {
  background: var(--color-text);
  color: var(--color-white);
}

/* --- Gallery Label --- */
.gallery__label {
  text-align: center;
  margin-bottom: var(--space-md);
  font-size: 0.8rem;
  font-family: var(--font-body);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* --- Section heading (centered) --- */
.section-heading {
  font-family: var(--font-heading);
  text-align: center;
  margin-bottom: var(--space-md);
}

/* --- Personal note heading --- */
.personal-heading {
  font-style: italic;
  margin-bottom: 1rem;
}

/* --- Page with top padding (contact, success) --- */
.page-section {
  padding-top: calc(var(--header-height) + var(--space-xl));
}

.page-section--centered {
  padding-top: calc(var(--header-height) + var(--space-2xl));
  text-align: center;
}

.page-section--centered p {
  margin-top: var(--space-md);
  color: var(--color-text-light);
  font-size: 1.05rem;
}

.page-section--centered .btn {
  margin-top: var(--space-lg);
}

/* --- Spacer --- */
.spacer {
  height: var(--space-lg);
}

/* --- Skip to content --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: 0.5rem 1rem;
  background: var(--color-text);
  color: var(--color-white);
  font-size: 0.85rem;
  z-index: 2000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-xs);
}

/* --- Footer --- */
.footer {
  padding: var(--space-lg) var(--space-md);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* --- Video --- */
.video-container {
  max-width: var(--max-width-narrow);
  margin: 0 auto var(--space-lg);
  padding: 0 var(--space-md);
}

.video-container video {
  width: 100%;
  display: block;
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 900px) {
  .nav__links {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }

  .header {
    padding: 0 var(--space-sm);
  }

  .bio {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding-top: calc(var(--header-height) + var(--space-lg));
  }

  .bio__image {
    max-width: 500px;
    margin: 0 auto;
  }

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

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

  .project-card {
    aspect-ratio: 16/9;
  }

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

  .lightbox__nav {
    font-size: 2.5rem;
    padding: 20px;
  }

  .lightbox__close {
    font-size: 2rem;
    padding: 12px;
  }
}

/* Phone */
@media (max-width: 600px) {
  :root {
    --space-lg: 3rem;
    --space-xl: 4rem;
    --space-2xl: 5rem;
    --space-md: 1.25rem;
    --header-height: 60px;
  }

  .header {
    padding: 0 1rem;
  }

  .header__logo a {
    font-size: 1.05rem;
  }

  .nav__toggle span {
    width: 22px;
  }

  .hero__title {
    font-size: clamp(2rem, 8vw, 3.5rem);
    padding: 0 1rem;
  }

  .hero__subtitle {
    font-size: 0.7rem;
    letter-spacing: 0.12em;
  }

  .intro p {
    font-size: 0.95rem;
  }

  .project-card {
    aspect-ratio: 3/2;
  }

  .project-card__title {
    font-size: 1.3rem;
  }

  .project-card__subtitle {
    font-size: 0.75rem;
  }

  .project-content {
    padding-top: calc(var(--header-height) + var(--space-md));
  }

  .project-header h1 {
    font-size: clamp(1.6rem, 6vw, 2.5rem);
  }

  .project-header .tagline {
    font-size: 1rem;
  }

  .project-text p {
    font-size: 0.95rem;
    line-height: 1.75;
  }

  .full-image {
    padding: 0 var(--space-sm);
  }

  .full-image img {
    max-height: 40vh;
  }

  .gallery {
    padding: 0 var(--space-sm);
  }

  .gallery__grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
  }

  .gallery__label {
    font-size: 0.65rem;
    margin-bottom: var(--space-sm);
  }

  .sub-nav {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .bio {
    padding-top: calc(var(--header-height) + var(--space-lg));
  }

  .bio__image {
    max-width: 100%;
  }

  .bio__content {
    padding-top: 0;
  }

  .bio__content h1 {
    font-size: clamp(1.8rem, 7vw, 2.5rem);
    margin-bottom: var(--space-sm);
  }

  .bio__content p {
    font-size: 0.95rem;
    line-height: 1.75;
  }

  .cv-entry {
    margin-bottom: var(--space-sm);
  }

  .cv-entry__title {
    font-size: 0.95rem;
  }

  .cv-entry__detail {
    font-size: 0.85rem;
  }

  .contact__info h1,
  .contact__info h2 {
    font-size: clamp(1.6rem, 6vw, 2.5rem);
  }

  .contact__links a {
    margin-right: var(--space-sm);
    font-size: 0.8rem;
  }

  .project-text {
    padding: 0 var(--space-sm);
  }

  .project-text--personal {
    padding-left: var(--space-sm);
  }

  .nav__mobile a {
    font-size: 1.6rem;
  }

  .nav__mobile-sub a {
    font-size: 1rem;
  }

  .nav__mobile-close {
    top: 1rem;
    right: 1rem;
  }

  .lightbox__nav--prev {
    left: 0.5rem;
  }

  .lightbox__nav--next {
    right: 0.5rem;
  }

  .footer {
    padding: var(--space-md) var(--space-sm);
  }

  .footer p {
    font-size: 0.7rem;
  }

  .btn {
    padding: 0.75rem 2rem;
    font-size: 0.75rem;
    width: 100%;
    text-align: center;
  }

  .video-container {
    padding: 0 var(--space-sm);
  }
}