/* ========================================
   Paperloris — Terminal-Inspired Design
   ======================================== */

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

/* --- Progress Bar --- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-text);
  z-index: 200;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.15s linear;
  opacity: 0.4;
  will-change: transform;
}

[data-theme="dark"] .progress-bar {
  opacity: 0.5;
}

:root {
  --color-text: #1a1a1a;
  --color-text-light: #555;
  --color-text-lighter: #999;
  --color-muted: rgba(0, 0, 0, 0.06);
  --color-border: rgba(0, 0, 0, 0.07);
  --color-accent: #000;

  --body-bg: #f5f3ef;
  --body-bg-to: #eeebe6;
  --grid-color: rgba(0, 0, 0, 0.035);

  --footer-bg: #f0eeea;
  --footer-text: #555;
  --footer-border: rgba(0, 0, 0, 0.08);

  --font: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --container-max: 1200px;
  --section-spacing: 7rem;
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  --color-text: #e8e5e0;
  --color-text-light: #8a857e;
  --color-text-lighter: #5e5a55;
  --color-muted: rgba(255, 255, 255, 0.03);
  --color-border: rgba(255, 255, 255, 0.05);
  --color-accent: #fff;

  --body-bg: #121110;
  --body-bg-to: #1a1816;
  --grid-color: rgba(255, 255, 255, 0.022);

  --footer-bg: #111;
  --footer-text: rgba(255, 255, 255, 0.65);
  --footer-border: rgba(255, 255, 255, 0.08);
}

/* --- Base --- */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 300;
  line-height: 1.85;
  color: var(--color-text);
  background: linear-gradient(160deg, var(--body-bg), var(--body-bg-to));
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 48px 48px;
}

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

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--color-text);
  color: var(--body-bg);
  font-size: 0.6875rem;
  border-radius: 4px;
  transition: top var(--transition);
}
.skip-link:focus { top: 1rem; }

/* --- Typography --- */
h1, h2, h3 { font-weight: 500; line-height: 1.15; letter-spacing: -0.015em; }

.section-label {
  display: block;
  font-size: 0.625rem;
  font-weight: 400;
  color: var(--color-text-lighter);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  max-width: 460px;
  font-weight: 300;
  line-height: 1.7;
}

.sc {
  font-variant: small-caps;
  letter-spacing: 0.04em;
}

.section-header {
  margin-bottom: 4rem;
}

/* --- Keyframes --- */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-12px) scale(1.01); }
}

@keyframes iconPulse {
  0%, 100% { transform: scale(1); opacity: 0.45; }
  50% { transform: scale(1.18); opacity: 0.8; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero__title .cursor {
  animation: blink 1s step-end infinite;
  font-weight: 500;
  opacity: 0.5;
  margin-left: 2px;
}

/* --- Prompt --- */
.prompt {
  color: var(--color-text-lighter);
  user-select: none;
}

/* --- Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: transform, opacity;
}
.reveal--d1 { transition-delay: 0s; }
.reveal--d2 { transition-delay: 0.1s; }
.reveal--d3 { transition-delay: 0.2s; }
.revealed { opacity: 1; transform: translateY(0); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 0;
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0;
  transition: color var(--transition), border-color var(--transition);
  border-bottom: 1.5px solid transparent;
  color: var(--color-text-light);
}

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

.btn--primary {
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0;
  transition: padding var(--transition);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
  z-index: 1;
  padding-top: 0.875rem;
  padding-bottom: 0.875rem;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 0;
}

.logo__img {
  display: block;
  width: 80px;
  height: 80px;
  margin-top: -14px;
  margin-bottom: -24px;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.logo__img--dark { display: none; }
[data-theme="dark"] .logo__img--light { display: none; }
[data-theme="dark"] .logo__img--dark { display: block; }

.logo:hover .logo__img { opacity: 1; }

.header__right {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  flex-shrink: 0;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 4px;
  color: var(--color-text);
  transition: background var(--transition);
}

.theme-toggle:hover { background: var(--color-muted); }

.theme-toggle__sun { display: block; }
.theme-toggle__moon { display: none; }
[data-theme="dark"] .theme-toggle__sun { display: none; }
[data-theme="dark"] .theme-toggle__moon { display: block; }

.header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.38);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
  will-change: opacity;
}

[data-theme="dark"] .header::before {
  background: rgba(0, 0, 0, 0.3);
  border-bottom-color: rgba(255, 255, 255, 0.04);
}

.header--scrolled::before { opacity: 1; }

/* Hamburger */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  transition: background var(--transition);
}

.nav-toggle:hover { background: var(--color-muted); }

.nav-toggle__lines {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

.nav-toggle__close {
  display: none;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--color-text);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__lines { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__close { display: block; }

/* Nav List (mobile) */
.nav-list {
  position: fixed;
  top: 0;
  right: 0;
  width: 70%;
  max-width: 280px;
  height: 100vh;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  padding: 5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
  z-index: 99;
  overflow-y: auto;
  border-left: 1px solid rgba(255, 255, 255, 0.3);
  will-change: transform;
}

[data-theme="dark"] .nav-list { background: rgba(0, 0, 0, 0.2); border-left-color: rgba(255, 255, 255, 0.06); }

.nav-list--open { transform: translateX(0); }

.nav-list a {
  display: block;
  padding: 0.75rem 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition), padding var(--transition);
}

.nav-list a:hover { color: var(--color-text); padding-left: 0.25rem; }
.nav-list .active { color: var(--color-text); font-weight: 450; }

.no-scroll { overflow: hidden; }

/* ========================================
   Hero
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 7rem 0 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
  will-change: transform;
}
[data-theme="dark"] .hero-bg { opacity: 0.12; }

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: float 8s ease-in-out infinite;
}

.hero .container {
  position: relative;
  z-index: 1;
  animation: fadeUp 0.8s var(--ease) 0.2s both;
}

.hero-logo {
  position: absolute;
  right: 2%;
  top: 35%;
  transform: translateY(-50%);
  z-index: 0;
  pointer-events: none;
  animation: float 7s ease-in-out infinite;
  opacity: 0.08;
  mix-blend-mode: multiply;
}

[data-theme="dark"] .hero-logo {
  opacity: 0.05;
  mix-blend-mode: screen;
}

.hero-logo__img {
  display: block;
  width: clamp(280px, 40vw, 500px);
  height: auto;
}

.hero-logo__img--dark { display: none; }
[data-theme="dark"] .hero-logo__img--light { display: none; }
[data-theme="dark"] .hero-logo__img--dark { display: block; }

.hero__content {
  max-width: 680px;
}

.hero__prompt {
  font-size: 0.75rem;
  color: var(--color-text-lighter);
  margin-bottom: 1.5rem;
}

.hero__prompt .prompt { margin-right: 0.5rem; }

.hero__title {
  font-size: 2.75rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero__subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  max-width: 400px;
  font-weight: 300;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

/* ========================================
   Section Divider
   ======================================== */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent
  );
  transform: scaleX(0);
  transition: transform 0.6s var(--ease);
}

.section-divider.revealed {
  transform: scaleX(1);
}

/* ========================================
   About
   ======================================== */
.about {
  padding: var(--section-spacing) 0;
}

.about__inner {
  animation: fadeUp 0.5s var(--ease) both;
}

.about__inner {
  max-width: 680px;
}

.about__text {
  color: var(--color-text-light);
  margin-bottom: 1rem;
  font-size: 0.8125rem;
}

.about__text:last-of-type { margin-bottom: 0; }

.about__code {
  margin-top: 2rem;
  padding: 1.25rem;
  border-radius: 6px;
  background: var(--color-muted);
  border: 1px solid var(--color-border);
  font-size: 0.6875rem;
  line-height: 1.85;
  color: var(--color-text-light);
  overflow-x: auto;
  position: relative;
}

.about__code-header {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.625rem;
  border-bottom: 1px solid var(--color-border);
}

.about__code-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-lighter);
  opacity: 0.3;
}
.about__code-dot:nth-child(1) { background: #ef4444; opacity: 0.6; }
.about__code-dot:nth-child(2) { background: #eab308; opacity: 0.6; }
.about__code-dot:nth-child(3) { background: #22c55e; opacity: 0.6; }

.about__code-filename {
  font-size: 0.625rem;
  color: var(--color-text-lighter);
  margin-left: 0.5rem;
}

.about__code .kw  { color: #7c3aed; font-weight: 450; }
.about__code .str { color: #059669; }
.about__code .cm  { color: var(--color-text-lighter); font-style: italic; }
.about__code .pr  { color: #2563eb; }

[data-theme="dark"] .about__code .kw  { color: #a78bfa; }
[data-theme="dark"] .about__code .str { color: #34d399; }
[data-theme="dark"] .about__code .pr  { color: #60a5fa; }

/* ========================================
   Services
   ======================================== */
.services {
  padding: var(--section-spacing) 0;
}

.services__list {
  max-width: 600px;
}

.service-item {
  position: relative;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.service-item:last-child { border-bottom: none; }

.service-item__line {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.service-item__prompt {
  color: var(--color-text-lighter);
  font-size: 0.75rem;
  flex-shrink: 0;
  user-select: none;
}

.service-item__title {
  font-size: 0.9375rem;
  font-weight: 400;
}

.service-item__desc {
  font-size: 0.75rem;
  color: var(--color-text-lighter);
  line-height: 1.65;
  margin-top: 0.25rem;
}

.service-item__action {
  display: inline-block;
  margin-top: 0.75rem;
  padding-left: 2rem;
}

.service-item__action .btn {
  font-size: 0.6875rem;
  padding: 0.25rem 0;
}

/* ========================================
   Portfolio
   ======================================== */
.portfolio {
  padding: var(--section-spacing) 0;
}

.portfolio__grid {
  display: grid;
  gap: 0;
}

.portfolio-item {
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0;
}

.portfolio-item:last-child { border-bottom: none; }

.portfolio-item__inner {
  display: grid;
  gap: 1.25rem;
  align-items: center;
}

.portfolio-item__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-muted);
  border-radius: 4px;
}

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

.portfolio-item:hover .portfolio-item__image img {
  transform: scale(1.03);
}

.portfolio-item__category {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-size: 0.5625rem;
  font-weight: 450;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(6px);
  padding: 0.2rem 0.625rem;
  border-radius: 3px;
  opacity: 0;
  transition: opacity var(--transition);
}

.portfolio-item:hover .portfolio-item__category { opacity: 1; }

.portfolio-item__info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.portfolio-item__title {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.portfolio-item__desc {
  font-size: 0.6875rem;
  color: var(--color-text-light);
}

/* ========================================
   Testimonials
   ======================================== */
.testimonials {
  padding: var(--section-spacing) 0;
}

.testimonials__list {
  max-width: 680px;
}

.testimonial {
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
}

.testimonial:last-child { border-bottom: none; }

.testimonial__marker {
  font-size: 2.5rem;
  line-height: 1;
  color: var(--color-text-lighter);
  opacity: 0.15;
  margin-bottom: 0.5rem;
  user-select: none;
  font-family: serif;
}

.testimonial__text {
  font-size: 0.8125rem;
  line-height: 1.7;
}

.testimonial__author {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.testimonial__name {
  font-style: normal;
  font-weight: 450;
  font-size: 0.75rem;
  color: var(--color-text);
}

.testimonial__role {
  font-size: 0.6875rem;
  color: var(--color-text-lighter);
}

/* ========================================
   Contact
   ======================================== */
.contact {
  padding: var(--section-spacing) 0;
}

.contact__grid {
  display: grid;
  gap: 2.5rem;
}

.contact__grid {
  display: grid;
  gap: 2.5rem;
  max-width: 800px;
}

.contact-form {
  display: grid;
  gap: 1.5rem;
}

.contact-form__group {
  display: grid;
  gap: 0.375rem;
}

.contact-form__label {
  font-size: 0.625rem;
  font-weight: 450;
  letter-spacing: 0.06em;
  color: var(--color-text-lighter);
}

.contact-form__input,
.contact-form__textarea {
  width: 100%;
  padding: 0.625rem 0;
  font-family: var(--font);
  font-size: 0.8125rem;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-bottom: 1.5px solid var(--color-border);
  transition: border-color var(--transition);
  outline: none;
}

.contact-form__input::placeholder,
.contact-form__textarea::placeholder {
  color: var(--color-text-lighter);
  font-weight: 300;
}

.contact-form__input:focus,
.contact-form__textarea:focus {
  border-color: var(--color-text);
}

.contact-form__textarea {
  resize: vertical;
  min-height: 80px;
}

.contact-form .btn {
  margin-top: 0.25rem;
  justify-self: start;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}

.modal-overlay--open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 2.5rem 2rem;
  max-width: 380px;
  width: 90%;
  text-align: center;
  position: relative;
  transform: translateY(12px);
  transition: transform 0.3s var(--ease);
}

.modal-overlay--open .modal {
  transform: translateY(0);
}

.modal__close {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-text-light);
  transition: color var(--transition);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.modal__close:hover { color: var(--color-text); }

.modal__boat {
  margin-bottom: 0.75rem;
  animation: boatFloat 2.5s ease-in-out infinite;
  color: var(--color-text);
  opacity: 0.5;
}

@keyframes boatFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-4px) rotate(-2deg); }
  50% { transform: translateY(-8px) rotate(0deg); }
  75% { transform: translateY(-4px) rotate(2deg); }
}

.modal__title {
  font-size: 1rem;
  font-weight: 450;
  margin-bottom: 0.5rem;
  font-variant: small-caps;
  letter-spacing: 0.04em;
}

.modal__text {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.contact-info {
  display: grid;
  gap: 1.5rem;
  align-content: start;
}

.contact-info__item {
  display: grid;
  gap: 0.25rem;
}

.contact-info__heading {
  font-size: 0.625rem;
  font-weight: 450;
  letter-spacing: 0.08em;
  color: var(--color-text-lighter);
}

.contact-info__item a {
  font-size: 0.8125rem;
  color: var(--color-text);
}
.contact-info__item a:hover { opacity: 0.6; }

.contact-info__social {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-text-light);
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.social-link:hover {
  color: var(--color-text);
  border-color: var(--color-text);
  background: var(--color-muted);
}

.social-link__title {
  font-weight: 450;
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 90;
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background: var(--color-muted);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  will-change: transform, opacity;
}

.back-to-top--visible { opacity: 1; transform: translateY(0); pointer-events: auto; animation: fadeUp 0.3s var(--ease); }
.back-to-top:hover { transform: translateY(-3px); }

/* --- Chatbot --- */
.chat-toggle {
  position: fixed;
  bottom: 5.5rem;
  right: 1.5rem;
  z-index: 91;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition), opacity var(--transition), box-shadow var(--transition);
  will-change: transform;
}

[data-theme="dark"] .chat-toggle {
  background: rgba(0, 0, 0, 0.15);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.chat-toggle:hover { background: rgba(255, 255, 255, 0.25); transform: scale(1.06); }
[data-theme="dark"] .chat-toggle:hover { background: rgba(255, 255, 255, 0.08); }

.chat-panel {
  position: fixed;
  bottom: 5rem;
  right: 1.5rem;
  width: 340px;
  max-width: calc(100vw - 3rem);
  max-height: 420px;
  height: 60vh;
  z-index: 92;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(12px) scale(0.97);
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  will-change: transform, opacity;
}

[data-theme="dark"] .chat-panel {
  background: rgba(0, 0, 0, 0.15);
  border-color: rgba(255, 255, 255, 0.06);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
}

.chat-panel--open { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }

@supports not (backdrop-filter: blur(1px)) {
  .chat-toggle { background: rgba(255, 255, 255, 0.9); }
  [data-theme="dark"] .chat-toggle { background: rgba(0, 0, 0, 0.9); }
  .chat-panel { background: rgba(255, 255, 255, 0.92); }
  [data-theme="dark"] .chat-panel { background: rgba(0, 0, 0, 0.9); }
}

.chat-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px 12px 0 0;
}

[data-theme="dark"] .chat-panel__header {
  border-bottom-color: rgba(255, 255, 255, 0.04);
  background: rgba(255, 255, 255, 0.02);
}

.chat-panel__title {
  font-size: 0.75rem;
  font-weight: 450;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chat-panel__title .prompt {
  color: var(--color-text-lighter);
}

.chat-prompt-glass {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  font-size: 0.6875rem;
}

[data-theme="dark"] .chat-prompt-glass { background: rgba(0, 0, 0, 0.25); }

.chat-panel__close {
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-text-light);
  transition: color var(--transition);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.125rem;
}

.chat-panel__close:hover { color: var(--color-text); }

.chat-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-msg {
  max-width: 85%;
  display: grid;
  gap: 0.125rem;
}

.chat-msg--bot { align-self: flex-start; }
.chat-msg--user { align-self: flex-end; }

.chat-msg__sender {
  font-size: 0.5625rem;
  font-weight: 450;
  color: var(--color-text-lighter);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.chat-msg__text {
  font-size: 0.75rem;
  line-height: 1.6;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .chat-msg__text {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.04);
}

.chat-msg--user .chat-msg__text {
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--body-bg);
}

[data-theme="dark"] .chat-msg--user .chat-msg__text {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
}

.chat-panel__input-area {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 0 0 12px 12px;
}

[data-theme="dark"] .chat-panel__input-area {
  border-top-color: rgba(255, 255, 255, 0.04);
  background: rgba(255, 255, 255, 0.02);
}

.chat-panel__input {
  flex: 1;
  font: inherit;
  font-size: 0.75rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: transparent;
  color: var(--color-text);
  transition: border-color var(--transition);
}

.chat-panel__input:focus { border-color: var(--color-text); outline: none; }
.chat-panel__input::placeholder { color: var(--color-text-lighter); }

.chat-panel__send {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  background: var(--color-text);
  color: var(--body-bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: opacity var(--transition);
  flex-shrink: 0;
}

.chat-panel__send:hover { opacity: 0.75; }

.chat-msg__typing {
  display: flex;
  gap: 4px;
  padding: 0.5rem 0.75rem;
  align-items: center;
}

.chat-msg__typing span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-text-lighter);
  animation: typingDot 1.2s ease-in-out infinite;
}

.chat-msg__typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-msg__typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingDot {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

/* --- Chat quick buttons --- */
.chat-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 1rem 0.75rem;
  flex-shrink: 0;
}

.chat-btn {
  font: inherit;
  font-size: 0.6875rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
  flex-shrink: 0;
}

[data-theme="dark"] .chat-btn {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.08);
}

.chat-btn:hover { background: rgba(255, 255, 255, 0.3); }
[data-theme="dark"] .chat-btn:hover { background: rgba(255, 255, 255, 0.1); }

.chat-btn--hidden { display: none; }

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 3rem 0 1.5rem;
  background: var(--footer-bg);
  color: var(--footer-text);
  margin-top: var(--section-spacing);
  transition: background var(--transition), color var(--transition);
}

.footer .logo { color: var(--color-text); display: inline-block; opacity: 0.6; }
.footer .logo:hover { opacity: 1; }

.footer__content {
  display: grid;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--footer-border);
  margin-bottom: 1.5rem;
}

.footer__tagline { font-size: 0.75rem; opacity: 0.35; }

.footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.footer__nav-list a {
  font-size: 0.75rem;
  color: var(--footer-text);
  opacity: 0.5;
}
.footer__nav-list a:hover { opacity: 1; }

.footer__bottom { text-align: center; }
.footer__bottom p { font-size: 0.6875rem; opacity: 0.25; }

/* ========================================
   Focus & Reduced Motion
   ======================================== */
:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

/* --- Form Validation --- */
.contact-form__input--error {
  border-color: #ef4444 !important;
}

.contact-form__input--touched:valid:not(.contact-form__input--error) {
  border-color: #22c55e;
}

.contact-form__input--touched:invalid:not(:placeholder-shown) {
  border-color: #ef4444;
}

/* --- Print Styles --- */
@media print {
  .header, .back-to-top, .hero-bg, .chat-toggle, .chat-panel { display: none; }
  body { background: #fff !important; color: #000 !important; }
  .hero { min-height: auto; padding: 2rem 0; }
  .hero__title { font-size: 2rem; }
  .section-divider { opacity: 0.2; }
  .about__code { break-inside: avoid; }
  .service-item, .portfolio-item, .testimonial { break-inside: avoid; }
  a[href]::after { content: ' (' attr(href) ')'; font-size: 0.65em; opacity: 0.6; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .contact-form__input, .contact-form__textarea { border-color: #ccc; }
}

/* --- Backdrop-filter Fallback --- */
@supports not (backdrop-filter: blur(1px)) {
  .header::before { background: rgba(255, 255, 255, 0.92); }
  [data-theme="dark"] .header::before { background: rgba(0, 0, 0, 0.92); }
  .nav-list { background: rgba(255, 255, 255, 0.95); }
  [data-theme="dark"] .nav-list { background: rgba(0, 0, 0, 0.9); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ========================================
   Responsive — Tablet
   ======================================== */
@media (min-width: 768px) {
  :root { --section-spacing: 8rem; }

  .container { padding: 0 2rem; }

  .section-title { font-size: 2.75rem; }
  .section-header { margin-bottom: 5rem; }

  .hero__title { font-size: 3.5rem; }

  .portfolio__grid { gap: 0; }

  .portfolio-item__inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .portfolio-item:nth-child(even) .portfolio-item__inner {
    direction: rtl;
  }

  .portfolio-item:nth-child(even) .portfolio-item__inner > * {
    direction: ltr;
  }

  .contact__grid { grid-template-columns: 1.2fr 0.8fr; gap: 2.5rem; }

  .footer__content { grid-template-columns: 1fr 1fr; align-items: start; }
  .footer__nav-list { justify-content: flex-end; }

  /* Desktop nav */
  .nav-toggle { display: none; }
  .theme-toggle { order: 0; }

  .nav-list {
    position: static;
    width: auto;
    max-width: none;
    height: auto;
    background: transparent;
    backdrop-filter: none;
    padding: 0;
    flex-direction: row;
    gap: 0.125rem;
    transform: none;
    border-left: none;
    overflow: visible;
  }

  .nav-list a {
    padding: 0.375rem 0.75rem;
    font-size: 0.6875rem;
    color: var(--color-text-light);
    border-bottom: none;
    border-radius: 4px;
    position: relative;
    opacity: 1;
    transform: none;
  }

  .nav-list a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-muted);
    border-radius: 4px;
    opacity: 0;
    transition: opacity var(--transition);
  }

  .nav-list a:hover::before,
  .nav-list .active::before { opacity: 1; }

  .nav-list a:hover,
  .nav-list .active { color: var(--color-text); padding-left: 0.75rem; }
}

/* ========================================
   Responsive — Desktop
   ======================================== */
@media (min-width: 1024px) {
  :root { --section-spacing: 9rem; }

  .container { padding: 0 2.5rem; }

  .hero__title { font-size: 4rem; }

  .portfolio-item__inner { gap: 3rem; }
}