/* === DESIGN TOKENS === */
:root {
  --color-bg:           #0f172a;
  --color-surface:      #1e293b;
  --color-surface-deep: #080f1a;
  --color-accent:       #f59e0b;
  --color-accent-dim:   #f59e0b18;
  --color-accent-border:#f59e0b33;
  --color-text:         #e2e8f0;
  --color-muted:        #94a3b8;
  --color-subtle:       #64748b;
  --color-border:       #2d3f55;
  --color-footer:       #0a1120;
  --color-heading:      #ffffff;

  --font-base: 'Inter', system-ui, -apple-system, sans-serif;

  --text-xs:   0.6875rem; /* 11px */
  --text-sm:   0.8125rem; /* 13px */
  --text-base: 1rem;      /* 16px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.5rem;    /* 24px */
  --text-2xl:  1.625rem;  /* 26px */
  --text-3xl:  2rem;      /* 32px */
  --text-hero: 2.625rem;  /* 42px */

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 12px;

  --max-w: 1100px;
  --section-pad: 56px 0;
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* === UTILITIES === */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.section-title {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-heading);
  line-height: 1.2;
  margin-bottom: 32px;
}
.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: var(--text-sm);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  font-family: var(--font-base);
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.88; }

/* === NAV === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: border-color 0.3s;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}
.nav__logo {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: var(--color-heading);
}
.nav__logo span { color: var(--color-accent); }
.nav__links {
  display: flex;
  gap: 28px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted);
}
.nav__links a:hover { color: var(--color-text); }
.nav__cta { font-size: var(--text-sm); padding: 8px 18px; }
.nav__lang {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-left: 24px;
}
.nav__lang-active { color: var(--color-accent); }
.nav__lang-sep    { color: var(--color-border); }
.nav__lang-link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav__lang-link:hover,
.nav__lang-link:focus-visible {
  color: var(--color-accent);
  outline: none;
}
.nav__links a:focus-visible,
.nav__logo:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }
.btn-primary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

/* Mobile: hide links, keep logo + CTA */
@media (max-width: 640px) {
  .nav__links { display: none; }
}

.nav--scrolled {
  border-bottom-color: #f59e0b22;
}

/* Mobile hamburger button */
.nav__hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--color-muted);
  font-size: 1.375rem;
  line-height: 1;
}
.nav__hamburger:hover { color: var(--color-text); }
.nav__hamburger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (max-width: 640px) {
  .nav__hamburger { display: flex; align-items: center; }
}

/* Mobile nav panel */
.nav__mobile {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}
.nav__mobile[hidden] { display: none; }
.nav__mobile-link {
  display: block;
  padding: 14px 24px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}
.nav__mobile-link:last-child { border-bottom: none; }
.nav__mobile-link:hover { color: var(--color-text); background: var(--color-surface); }
.nav__mobile-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

/* === HERO === */
.hero {
  padding: 80px 0 72px;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, #1e3a5f 0%, var(--color-bg) 70%);
  text-align: center;
}
.hero__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent-border);
  padding: 5px 16px;
  border-radius: 99px;
  margin-bottom: 24px;
}
.hero__h1 {
  font-size: var(--text-hero);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--color-heading);
  margin-bottom: 20px;
}
.hero__h1 span { color: var(--color-accent); }
.hero__sub {
  font-size: var(--text-base);
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto 32px;
  line-height: 1.65;
}
.hero__actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
.hero__secondary {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-subtle);
}
.hero__secondary:hover { color: var(--color-muted); }
.hero__secondary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }

@media (max-width: 640px) {
  .hero { padding: 56px 0 48px; }
  .hero__h1 { font-size: 2rem; }
}

/* === SERVICES === */
.services {
  padding: var(--section-pad);
  border-top: 1px solid var(--color-border);
}
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
}
.service-card__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}
.service-card__desc {
  font-size: var(--text-xs);
  color: var(--color-muted);
  line-height: 1.6;
}

@media (max-width: 640px) {
  .services__grid { grid-template-columns: 1fr; }
}

/* === PROCESS === */
.process {
  padding: var(--section-pad);
  background: var(--color-surface-deep);
  border-top: 1px solid var(--color-border);
}
.process__steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.process__num {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-accent);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 12px;
}
.process__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}
.process__desc {
  font-size: var(--text-xs);
  color: var(--color-muted);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .process__steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .process__steps { grid-template-columns: 1fr; }
}

/* === ABOUT === */
.about {
  padding: var(--section-pad);
  border-top: 1px solid var(--color-border);
}
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.about__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-heading);
  line-height: 1.15;
  margin-bottom: 16px;
}
.about__body {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.75;
}

@media (max-width: 640px) {
  .about__inner { grid-template-columns: 1fr; }
  .about__portfolio { order: -1; }
}

/* Portfolio gallery */
.about__portfolio {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.portfolio-item {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid var(--color-border);
  transition: border-color 0.2s;
}
.portfolio-item:hover,
.portfolio-item:focus-visible {
  border-color: var(--color-accent);
  outline: none;
}
.portfolio-item__img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.2s ease;
}
.portfolio-item:hover .portfolio-item__img,
.portfolio-item:focus-visible .portfolio-item__img {
  transform: scale(1.04);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: pointer;
}
.lightbox[hidden] { display: none; }
.lightbox__img {
  max-width: 92vw;
  max-height: 88vh;
  object-fit: contain;
  border-radius: var(--radius);
  cursor: default;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}
.lightbox__close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 10px;
  opacity: 0.7;
  transition: opacity 0.15s;
}
.lightbox__close:hover,
.lightbox__close:focus-visible {
  opacity: 1;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* === CONTACT === */
.contact {
  padding: var(--section-pad);
  background: var(--color-surface-deep);
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.contact__inner { max-width: 520px; margin: 0 auto; }
.contact__sub {
  font-size: var(--text-sm);
  color: var(--color-subtle);
  margin-bottom: 32px;
  margin-top: -20px;
}
.contact__form { text-align: left; }
.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.form__group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.form__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-muted);
}
.form__optional { font-weight: 400; color: var(--color-subtle); }
.form__input {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: var(--text-sm);
  color: var(--color-text);
  font-family: var(--font-base);
  width: 100%;
  transition: border-color 0.15s;
}
.form__input:focus {
  border-color: var(--color-accent);
}
.form__input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}
.form__input.is-error { border-color: #ef4444; }
.form__textarea { resize: vertical; min-height: 100px; }
.form__error {
  font-size: 0.625rem;
  color: #ef4444;
  min-height: 14px;
}
.form__submit { width: 100%; margin-top: 6px; padding: 14px; font-size: var(--text-base); }
.form__status {
  margin-top: 14px;
  font-size: var(--text-sm);
  text-align: center;
  min-height: 20px;
}
.form__status.is-success { color: #4ade80; }
.form__status.is-error   { color: #ef4444; }
.contact__fallback {
  margin-top: 24px;
  font-size: var(--text-xs);
  color: var(--color-subtle);
}
.contact__email {
  color: var(--color-accent);
  font-weight: 600;
}
.contact__email:hover { text-decoration: underline; }
.contact__email:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }

@media (max-width: 640px) {
  .form__row { grid-template-columns: 1fr; }
}

/* === FOOTER === */
.footer {
  background: var(--color-footer);
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}
.footer__inner {
  display: flex;
  flex-direction: column;
}
.footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer__logo {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: var(--color-heading);
}
.footer__logo span { color: var(--color-accent); }
.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-subtle);
}
.footer__privacy {
  font-size: var(--text-xs);
  color: var(--color-subtle);
}
.footer__privacy:hover { color: var(--color-muted); }
.footer__logo:focus-visible,
.footer__privacy:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }
.footer__divider {
  border-top: 1px solid var(--color-border);
  margin: 16px 0 12px;
}
.footer__social {
  display: flex;
  justify-content: center;
  gap: 8px;
}
.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  color: var(--color-subtle);
  border-radius: var(--radius-sm);
  transition: color 0.2s, background-color 0.2s;
}
.footer__social-link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
}
.footer__social-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .footer__top { flex-direction: column; text-align: center; }
}

/* === PAGE-LOAD ANIMATION === */
.page-corner {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-color: var(--color-accent) transparent transparent transparent;
  border-width: 0;
  z-index: 9999;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  main {
    clip-path: polygon(0% 0%, 0% 0%, 0% 100%, 0% 100%);
    animation: page-reveal 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  }

  @keyframes page-reveal {
    0%   { clip-path: polygon(0% 0%,  0%   0%,   0%   100%, 0%   100%); }
    40%  { clip-path: polygon(0% 0%,  55%  0%,   40%  100%, 0%   100%); }
    100% { clip-path: polygon(0% 0%,  100% 0%,   100% 100%, 0%   100%); }
  }

  .page-corner {
    animation: corner-fold 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  }

  @keyframes corner-fold {
    0%   { border-width: 60px 0 0 60px; opacity: 1; }
    60%  { border-width: 20px 0 0 20px; opacity: 0.6; }
    100% { border-width: 0   0 0 0;     opacity: 0; }
  }
}

/* === THEME SLIDER === */
.theme-slider {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 10px 8px 12px;
  background: #1e293b;
  border: 1px solid #2d3f55;
  border-right: none;
  border-radius: 10px 0 0 10px;
  z-index: 100;
  user-select: none;
  touch-action: none;
}

.theme-slider__label {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #64748b;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.theme-slider__track {
  width: 8px;
  height: 120px;
  border-radius: 4px;
  background: linear-gradient(to bottom,
    #00e8ff  0%,
    #818cf8 10%,
    #0f172a 20%,
    #93c5fd 30%,
    #6ee7b7 40%,
    #4a7c59 50%,
    #4a8c1e 60%,
    #c1440e 70%,
    #d97706 80%,
    #4338ca 90%,
    #0e7490 100%
  );
  position: relative;
  cursor: pointer;
}

.theme-slider__thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid var(--color-accent);
  position: absolute;
  left: 50%;
  top: 20%;
  transform: translate(-50%, -50%);
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  transition: border-color 0.15s;
}