/* ============================================================
   OMAR CARRIL — GALLERY WEBSITE
   Design System & Styles  v1.0.0
   ============================================================ */

/* --- GOOGLE FONTS --- */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@200;300;400;500;600&display=swap');

/* --- DESIGN TOKENS --- */
:root {
  /* Palette — sky blue elegance */
  --color-bg:           #FAFBFD;
  --color-bg-alt:       #FFFFFF;
  --color-bg-dark:      #0B0F1A;
  --color-text:         #0B0F1A;
  --color-text-light:   #6B7A8D;
  --color-text-inv:     #F0F4F8;
  --color-accent:       #7CB9E8;
  --color-accent-dark:  #3D8EC9;
  --color-accent-light: #C5DFF0;
  --color-border:       #E2E8F0;
  --color-overlay:      rgba(11, 15, 26, 0.72);
  --color-overlay-light:rgba(11, 15, 26, 0.40);
  --color-glass:        rgba(255, 255, 255, 0.06);

  /* Typography — 3 sizes only */
  --font:               'Outfit', sans-serif;
  --size-lg:            clamp(2.4rem, 5vw, 4.5rem);
  --size-md:            clamp(0.85rem, 1.4vw, 1.1rem);
  --size-sm:            clamp(0.65rem, 0.9vw, 0.8rem);

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

  /* Motion */
  --ease:               cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out:           cubic-bezier(0.16, 1, 0.3, 1);
  --duration:           0.5s;
  --duration-fast:      0.3s;

  /* Layout */
  --nav-height:         72px;
  --max-width:          1400px;
  --letter-space:       0.18em;
  --letter-space-tight: 0.08em;
}

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

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

body {
  font-family: var(--font);
  font-size: var(--size-md);
  font-weight: 300;
  color: var(--color-text);
  background: var(--color-bg);
  text-transform: uppercase;
  letter-spacing: var(--letter-space);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

button {
  font-family: var(--font);
  text-transform: uppercase;
  letter-spacing: var(--letter-space);
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

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

/* --- SCROLLBAR --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-accent-light);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* ============================================================
   LOADING SCREEN
   ============================================================ */
#loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--color-bg-dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.8s var(--ease), visibility 0.8s;
}

#loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

#loader .loader-line {
  width: 120px;
  height: 1px;
  background: rgba(255,255,255,0.1);
  position: relative;
  overflow: hidden;
}

#loader .loader-line::after {
  content: '';
  position: absolute;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  animation: loaderSlide 1.2s var(--ease) infinite;
}

@keyframes loaderSlide {
  to { left: 100%; }
}

#loader span {
  font-size: var(--size-sm);
  color: var(--color-text-inv);
  letter-spacing: var(--letter-space);
  margin-top: var(--space-sm);
  opacity: 0.5;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  transition: background var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              backdrop-filter var(--duration) var(--ease);
}

.nav.scrolled {
  background: rgba(250, 251, 253, 0.92);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav__logo {
  font-size: var(--size-md);
  font-weight: 500;
  letter-spacing: var(--letter-space);
  color: var(--color-text-inv);
  transition: color var(--duration) var(--ease);
}

.nav.scrolled .nav__logo {
  color: var(--color-text);
}

.nav__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav__links a {
  font-size: var(--size-sm);
  font-weight: 400;
  color: var(--color-text-inv);
  opacity: 0.7;
  transition: opacity var(--duration-fast) var(--ease),
              color var(--duration) var(--ease);
  position: relative;
}

.nav.scrolled .nav__links a {
  color: var(--color-text);
}

.nav__links a:hover {
  opacity: 1;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--duration-fast) var(--ease);
}

.nav__links a:hover::after {
  width: 100%;
}

/* Mobile hamburger */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.nav__burger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-text-inv);
  transition: transform var(--duration-fast) var(--ease),
              opacity var(--duration-fast) var(--ease),
              background var(--duration) var(--ease);
}

.nav.scrolled .nav__burger span {
  background: var(--color-text);
}

.nav__burger.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav__burger.open span:nth-child(2) {
  opacity: 0;
}
.nav__burger.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Language switcher */
.nav__lang {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-left: var(--space-sm);
}

.lang-btn {
  width: 22px;
  height: 16px;
  padding: 0;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 2px;
  cursor: pointer;
  opacity: 0.45;
  transition: opacity var(--duration-fast) var(--ease),
              border-color var(--duration-fast) var(--ease),
              transform var(--duration-fast) var(--ease);
  overflow: hidden;
  background: none;
}

.lang-btn svg {
  width: 100%;
  height: 100%;
  display: block;
}

.lang-btn:hover {
  opacity: 0.85;
  transform: scale(1.1);
}

.lang-btn.active {
  opacity: 1;
  border-color: var(--color-accent);
  box-shadow: 0 0 6px rgba(124, 185, 232, 0.4);
}

.nav.scrolled .lang-btn {
  border-color: rgba(11, 15, 26, 0.2);
}

/* ============================================================
   HERO — PARALLAX
   ============================================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: -20%;
  background-size: cover;
  background-position: center;
  filter: brightness(0.35) saturate(0.8);
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-inv);
  padding: var(--space-md);
}

.hero__name {
  font-size: var(--size-lg);
  font-weight: 200;
  letter-spacing: 0.35em;
  line-height: 1.1;
  margin-bottom: var(--space-xs);
  opacity: 0;
  transform: translateY(40px);
  animation: heroFadeUp 1.2s var(--ease-out) 0.5s forwards;
}

.hero__subtitle {
  font-size: var(--size-sm);
  font-weight: 300;
  letter-spacing: var(--letter-space);
  color: var(--color-accent-light);
  opacity: 0;
  transform: translateY(20px);
  animation: heroFadeUp 1s var(--ease-out) 0.9s forwards;
}

.hero__divider {
  width: 60px;
  height: 1px;
  background: var(--color-accent);
  margin: var(--space-sm) auto;
  opacity: 0;
  transform: scaleX(0);
  animation: heroLineGrow 0.8s var(--ease-out) 1.2s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--color-text-inv);
  font-size: var(--size-sm);
  opacity: 0;
  animation: heroFadeUp 0.8s var(--ease-out) 1.6s forwards;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.hero__scroll i {
  animation: scrollBounce 2s var(--ease) infinite;
}

@keyframes heroFadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heroLineGrow {
  to {
    opacity: 1;
    transform: scaleX(1);
  }
}

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

/* ============================================================
   SECTIONS — GENERAL
   ============================================================ */
.section {
  padding: var(--space-xl) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.section__title {
  font-size: var(--size-lg);
  font-weight: 200;
  letter-spacing: 0.25em;
  margin-bottom: var(--space-xs);
}

.section__line {
  width: 40px;
  height: 1px;
  background: var(--color-accent);
  margin: var(--space-sm) auto;
}

.section__desc {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 2;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: opacity 0.9s var(--ease-out),
              transform 0.9s var(--ease-out);
}

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

/* ============================================================
   PARALLAX DIVIDERS
   ============================================================ */
.parallax-divider {
  position: relative;
  height: 50vh;
  min-height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.parallax-divider__bg {
  position: absolute;
  inset: -30%;
  background-size: cover;
  background-position: center;
  filter: brightness(0.3) saturate(0.7);
  will-change: transform;
}

.parallax-divider__text {
  position: relative;
  z-index: 2;
  color: var(--color-text-inv);
  font-size: var(--size-md);
  font-weight: 200;
  letter-spacing: var(--letter-space);
  text-align: center;
  padding: var(--space-md);
  max-width: 700px;
  line-height: 2;
}

/* ============================================================
   GALLERY FILTERS
   ============================================================ */
.filters {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filters button {
  font-size: var(--size-sm);
  font-weight: 400;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  color: var(--color-text-light);
  transition: all var(--duration-fast) var(--ease);
}

.filters button:hover,
.filters button.active {
  color: var(--color-bg);
  background: var(--color-text);
  border-color: var(--color-text);
}

/* ============================================================
   GALLERY GRID
   ============================================================ */
.gallery {
  columns: 4;
  column-gap: 12px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.gallery__item {
  break-inside: avoid;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  border-radius: 2px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}

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

.gallery__item img {
  width: 100%;
  display: block;
  transition: transform 0.7s var(--ease-out),
              filter 0.7s var(--ease-out);
}

.gallery__item:hover img {
  transform: scale(1.05);
  filter: brightness(0.75);
}

.gallery__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-sm);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease);
  background: linear-gradient(
    to top,
    rgba(11, 15, 26, 0.7) 0%,
    transparent 60%
  );
}

.gallery__item:hover .gallery__overlay {
  opacity: 1;
}

.gallery__overlay-title {
  font-size: var(--size-sm);
  font-weight: 400;
  color: var(--color-text-inv);
  letter-spacing: var(--letter-space-tight);
}

.gallery__overlay-tech {
  font-size: var(--size-sm);
  font-weight: 200;
  color: var(--color-accent-light);
  margin-top: 2px;
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: rgba(8, 10, 18, 0.96);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration) var(--ease),
              visibility var(--duration);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
}

.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--size-md);
  color: var(--color-text-inv);
  opacity: 0.6;
  transition: opacity var(--duration-fast);
  z-index: 10;
}

.lightbox__close:hover {
  opacity: 1;
}

.lightbox__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--size-md);
  color: var(--color-text-inv);
  opacity: 0.5;
  transition: opacity var(--duration-fast),
              transform var(--duration-fast);
  z-index: 10;
  padding: var(--space-sm);
}

.lightbox__arrow:hover {
  opacity: 1;
}

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

.lightbox__arrow--prev:hover {
  transform: translateY(-50%) translateX(-4px);
}

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

.lightbox__arrow--next:hover {
  transform: translateY(-50%) translateX(4px);
}

.lightbox__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 90vw;
  max-height: 90vh;
  position: relative;
}

/* Lightbox loading spinner */
.lightbox__spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
  border: 2px solid rgba(255,255,255,0.1);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: lbSpin 0.8s linear infinite;
  z-index: 1;
  transition: opacity 0.3s;
}

.lightbox__spinner.hidden {
  opacity: 0;
  pointer-events: none;
}

@keyframes lbSpin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.lightbox__img {
  max-width: 85vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 2px;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.4s var(--ease),
              transform 0.4s var(--ease);
  position: relative;
  z-index: 2;
}

.lightbox__img.loaded {
  opacity: 1;
  transform: scale(1);
}

.lightbox__info {
  text-align: center;
  color: var(--color-text-inv);
  margin-top: var(--space-sm);
}

.lightbox__title {
  font-size: var(--size-md);
  font-weight: 300;
  letter-spacing: var(--letter-space);
}

.lightbox__details {
  font-size: var(--size-sm);
  color: var(--color-accent-light);
  margin-top: 4px;
  font-weight: 200;
}

.lightbox__counter {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  margin-top: var(--space-xs);
  font-weight: 200;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.about__image {
  overflow: hidden;
  border-radius: 2px;
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease-out);
}

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

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

.about__text h2 {
  font-size: var(--size-lg);
  font-weight: 200;
  letter-spacing: 0.25em;
  margin-bottom: var(--space-xs);
}

.about__text .section__line {
  margin: var(--space-sm) 0;
}

.about__text p {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  line-height: 2.2;
  margin-bottom: var(--space-sm);
}

/* ============================================================
   EXHIBITIONS
   ============================================================ */
.exhibitions__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.exhibition-card {
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: var(--space-md);
  transition: border-color var(--duration-fast) var(--ease),
              transform var(--duration-fast) var(--ease),
              box-shadow var(--duration-fast) var(--ease);
}

.exhibition-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(124, 185, 232, 0.08);
}

.exhibition-card__year {
  font-size: var(--size-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.exhibition-card__title {
  font-size: var(--size-md);
  font-weight: 400;
  margin-bottom: var(--space-xs);
  letter-spacing: var(--letter-space-tight);
}

.exhibition-card__location {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  font-weight: 200;
}

.exhibition-card__date {
  font-size: var(--size-sm);
  color: var(--color-accent);
  font-weight: 200;
  margin-top: var(--space-xs);
  opacity: 0.7;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.contact__info {
  padding: var(--space-md) 0;
}

.contact__info p {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  line-height: 2.2;
  margin-bottom: var(--space-md);
}

.contact__detail {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.contact__detail i {
  color: var(--color-accent);
  width: 20px;
  text-align: center;
}

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

.contact__form input,
.contact__form textarea {
  font-family: var(--font);
  font-size: var(--size-sm);
  text-transform: uppercase;
  letter-spacing: var(--letter-space);
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  background: var(--color-bg-alt);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease);
  resize: vertical;
}

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

.contact__form textarea {
  min-height: 140px;
}

.contact__form button[type="submit"] {
  font-size: var(--size-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-text);
  color: var(--color-bg);
  border: 1px solid var(--color-text);
  border-radius: 2px;
  transition: all var(--duration-fast) var(--ease);
  align-self: flex-start;
}

.contact__form button[type="submit"]:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

/* ============================================================
   POPUP (TOAST) — replaces alert()
   ============================================================ */
.popup {
  position: fixed;
  bottom: var(--space-md);
  right: var(--space-md);
  z-index: 9500;
  background: var(--color-bg-dark);
  color: var(--color-text-inv);
  padding: var(--space-sm) var(--space-md);
  border-radius: 2px;
  font-size: var(--size-sm);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--duration-fast) var(--ease);
  pointer-events: none;
}

.popup.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.popup i {
  color: var(--color-accent);
  margin-right: var(--space-xs);
}

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

.footer__logo {
  font-size: var(--size-md);
  font-weight: 400;
  letter-spacing: var(--letter-space);
  margin-bottom: var(--space-sm);
}

.footer__socials {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.footer__socials a {
  font-size: var(--size-md);
  color: var(--color-text-light);
  transition: color var(--duration-fast);
}

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

.footer__copy {
  font-size: var(--size-sm);
  color: var(--color-text-light);
  font-weight: 200;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .gallery {
    columns: 3;
  }
  .exhibitions__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --space-lg: 2rem;
    --space-xl: 4rem;
  }

  /* Disable parallax on mobile — prevents jitter */
  .hero__bg {
    inset: 0;
    transform: none !important;
    background-attachment: scroll;
  }
  .parallax-divider__bg {
    inset: 0;
    transform: none !important;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background: var(--color-bg-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    transition: right var(--duration) var(--ease);
  }

  .nav__links.open {
    right: 0;
  }

  .nav__links a {
    color: var(--color-text-inv) !important;
    font-size: var(--size-md);
    opacity: 1;
  }

  .nav__burger {
    display: flex;
  }

  .nav__lang {
    margin-left: auto;
    margin-right: var(--space-sm);
  }

  .gallery {
    columns: 2;
    padding: 0 var(--space-sm);
  }

  .about {
    grid-template-columns: 1fr;
    padding: var(--space-lg) var(--space-sm);
  }

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

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

  .lightbox__arrow--prev { left: var(--space-xs); }
  .lightbox__arrow--next { right: var(--space-xs); }
}

@media (max-width: 480px) {
  .gallery {
    columns: 1;
  }
}