/* ==========================================================================
   Design Tokens v1.2 — editorial black + purple accent
   ========================================================================== */

:root {
  /* Raw colors */
  --color-black: #000000;
  --color-gray-950: #0A0A0A;
  --color-gray-900: #111111;
  --color-gray-700: #333333;
  --color-gray-500: #666666;
  --color-gray-400: #999999;
  --color-gray-200: #CCCCCC;
  --color-white: #FFFFFF;
  --color-purple-400: #C084FC;
  --color-purple-500: #A855F7;
  --color-purple-600: #9333EA;
  --color-purple-glow: rgba(168, 85, 247, 0.25);
  --color-amber-400: #FBBF24;
  --color-red-400: #F87171;
  --color-green-400: #4ADE80;

  /* Semantic backgrounds */
  --bg-page: var(--color-black);
  --bg-surface: var(--color-gray-950);
  --bg-surface-hover: var(--color-gray-900);
  --bg-elevated: var(--color-gray-950);
  --bg-accent-subtle: rgba(168, 85, 247, 0.06);

  /* Text */
  --text-primary: var(--color-white);
  --text-secondary: var(--color-gray-400);
  --text-muted: var(--color-gray-500);
  --text-inverse: var(--color-black);

  /* Accent */
  --color-accent: var(--color-purple-500);
  --color-accent-hover: var(--color-purple-400);
  --color-accent-active: var(--color-purple-600);
  --color-accent-muted: rgba(168, 85, 247, 0.15);

  /* Borders */
  --border-default: rgba(255, 255, 255, 0.15);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(168, 85, 247, 0.5);
  --border-width: 1px;
  --border-width-thick: 2px;

  /* Status */
  --color-success: var(--color-green-400);
  --color-error: var(--color-red-400);
  --color-badge: var(--color-amber-400);
  --overlay-backdrop: rgba(0, 0, 0, 0.85);

  /* Wireframe */
  --wireframe-stroke: rgba(255, 255, 255, 0.35);
  --wireframe-stroke-accent: var(--color-purple-glow);

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;

  --text-display: 4rem;
  --text-h1: 2.75rem;
  --text-h2: 1.75rem;
  --text-h3: 1.125rem;
  --text-body-lg: 1.0625rem;
  --text-body: 0.9375rem;
  --text-body-sm: 0.8125rem;
  --text-label: 0.6875rem;
  --text-button: 0.8125rem;

  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.12em;
  --tracking-display: 0.02em;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  --section-padding-y: 64px;
  --container-max: 1200px;
  --container-padding-x: 20px;
  --grid-gap: 32px;
  --stack-gap: 20px;
  --sidebar-width: 48px;
  --nav-rail-width: 120px;
  --lang-switcher-gap: var(--space-3);

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: none;
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.6);
  --shadow-card: none;
  --shadow-card-hover: none;
  --shadow-header: 0 1px 0 var(--border-subtle);
  --shadow-header-scrolled: 0 1px 0 var(--border-default);
  --shadow-glow-accent: 0 0 32px rgba(168, 85, 247, 0.12);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 500ms;
  --duration-wireframe: 24s;
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --transition-colors: color var(--duration-fast) var(--ease-default),
                        background-color var(--duration-fast) var(--ease-default),
                        border-color var(--duration-fast) var(--ease-default);
  --transition-opacity: opacity var(--duration-normal) var(--ease-default);

  /* Z-index */
  --z-base: 0;
  --z-sidebar: 50;
  --z-header: 100;
  --z-back-to-top: 150;
  --z-drawer: 200;
  --z-toast: 300;
  --z-skip-link: 400;

  /* Focus */
  --focus-ring: 0 0 0 2px var(--color-accent-muted);
  --focus-outline: 1px solid var(--color-accent);
  --focus-outline-offset: 3px;

  /* Icons */
  --icon-sm: 18px;
  --icon-md: 22px;
  --icon-lg: 28px;
  --icon-xl: 40px;
}

@media (min-width: 768px) {
  :root {
    --section-padding-y: 96px;
    --container-padding-x: 40px;
  }
}

@media (max-width: 767px) {
  :root {
    --text-display: var(--text-h1);
  }
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.drawer-open {
  overflow: hidden;
}

@media (min-width: 1024px) {
  main {
    padding-right: var(--nav-rail-width);
  }
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea {
  font: inherit;
}

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: var(--z-skip-link);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  color: var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--text-body-sm);
  font-weight: 500;
  transform: translateY(-200%);
  transition: transform var(--duration-normal) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-padding-x);
}

/* ==========================================================================
   Language Switcher
   ========================================================================== */

.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--lang-switcher-gap);
}

.lang-switcher__btn {
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  padding: var(--space-2);
  min-width: 32px;
  min-height: 32px;
  transition: var(--transition-colors);
}

.lang-switcher__btn:hover {
  color: var(--text-primary);
}

.lang-switcher__btn--active {
  color: var(--text-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.lang-switcher__sep {
  color: var(--text-muted);
  font-size: var(--text-label);
  user-select: none;
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    position: fixed;
    left: var(--space-6);
    top: 50%;
    transform: translateY(-50%);
    z-index: var(--z-sidebar);
    width: var(--sidebar-width);
  }

  .sidebar__label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: var(--text-label);
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--text-muted);
  }

  .sidebar__links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
  }

  .sidebar__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--text-primary);
    transition: var(--transition-colors);
  }

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

  .sidebar__link[data-contact-link="telegram"] {
    color: #26a5e4;
  }

  .sidebar__link[data-contact-link="telegram"]:hover {
    color: #1d96d8;
  }

  .sidebar__link[data-contact-link="whatsapp"] {
    color: #25d366;
  }

  .sidebar__link[data-contact-link="whatsapp"]:hover {
    color: #20bd5a;
  }
}

/* ==========================================================================
   Layout — Section
   ========================================================================== */

.section {
  padding-block: var(--section-padding-y);
  scroll-margin-top: 72px;
}

.section--hero {
  min-height: auto;
  display: flex;
  align-items: center;
}

.section--alt {
  background-color: var(--bg-surface);
}

@media (min-width: 1024px) {
  .section--hero {
    min-height: 90vh;
  }
}

/* ==========================================================================
   Section Header
   ========================================================================== */

.section-header {
  max-width: 560px;
}

.section-header__title {
  font-size: var(--text-h2);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  line-height: 1.2;
}

.section-header__subtitle {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  margin-top: var(--space-3);
  line-height: 1.65;
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: rgba(0, 0, 0, 0.95);
  box-shadow: var(--shadow-header);
  transition: box-shadow var(--duration-normal) var(--ease-default),
              background-color var(--duration-normal) var(--ease-default);
}

.header--scrolled {
  box-shadow: var(--shadow-header-scrolled);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: var(--space-4);
}

.header__logo {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-primary);
  transition: var(--transition-colors);
  flex-shrink: 0;
}

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

.header__nav--vertical {
  display: none;
}

.header__burger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  transition: var(--transition-colors);
}

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

.header__burger-icon--close {
  display: none;
}

.header__burger[aria-expanded="true"] .header__burger-icon--open {
  display: none;
}

.header__burger[aria-expanded="true"] .header__burger-icon--close {
  display: block;
}

.header__drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  visibility: hidden;
  pointer-events: none;
}

.header__drawer.is-open {
  visibility: visible;
  pointer-events: auto;
}

.header__drawer-backdrop {
  position: absolute;
  inset: 0;
  background: var(--overlay-backdrop);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-default);
}

.header__drawer.is-open .header__drawer-backdrop {
  opacity: 1;
}

.header__drawer-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--bg-page);
  border-left: var(--border-width) solid var(--border-default);
  padding: var(--space-16) var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
}

.header__drawer.is-open .header__drawer-panel {
  transform: translateX(0);
}

.header__drawer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.header__drawer-link {
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  transition: var(--transition-colors);
}

.header__drawer-link:hover,
.header__drawer-link.is-active {
  color: var(--text-primary);
}

.header__drawer-link.is-active {
  color: var(--color-accent);
}

.header__drawer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

@media (min-width: 1024px) {
  .header__burger {
    display: none;
  }

  .header__nav--vertical {
    display: block;
    position: fixed;
    right: var(--space-8);
    top: 50%;
    transform: translateY(-50%);
    z-index: var(--z-header);
  }

  .header__nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    align-items: flex-end;
  }

  .header__nav-link {
    font-size: var(--text-label);
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--text-muted);
    padding: var(--space-2) 0;
    transition: var(--transition-colors);
  }

  .header__nav-link:hover,
  .header__nav-link.is-active {
    color: var(--text-primary);
  }

  .header__nav-link.is-active {
    color: var(--color-accent);
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-button);
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition-colors);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--text-inverse);
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
}

.btn--primary:active {
  background-color: var(--color-accent-active);
}

.btn--primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn--primary:disabled:hover {
  background-color: var(--color-accent);
}

.form-note {
  margin-top: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--text-muted);
  line-height: 1.55;
  text-align: center;
}

.btn--telegram {
  background-color: #26a5e4;
  color: #fff;
}

.btn--telegram:hover {
  background-color: #1d96d8;
}

.btn--telegram:active {
  background-color: #1788c7;
}

.btn--whatsapp {
  background-color: #25d366;
  color: #fff;
  border: none;
}

.btn--whatsapp:hover {
  background-color: #20bd5a;
}

.btn--whatsapp:active {
  background-color: #1da851;
}

.btn--ghost {
  background-color: transparent;
  color: var(--text-primary);
  border: var(--border-width) solid var(--border-default);
}

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

.btn--block {
  width: 100%;
}

.btn__icon,
.btn__arrow {
  flex-shrink: 0;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero__grid {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

.hero__title {
  font-size: var(--text-display);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  text-transform: uppercase;
  color: var(--text-primary);
  line-height: 1.05;
}

.hero__subtitle {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  max-width: 480px;
  margin-top: var(--space-4);
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__wireframe {
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1 / 1;
  opacity: 0.7;
}

@media (prefers-reduced-motion: no-preference) {
  .hero__wireframe {
    animation: wireframe-rotate var(--duration-wireframe) linear infinite;
  }
}

@keyframes wireframe-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 45% 55%;
    gap: var(--space-16);
  }
}

/* ==========================================================================
   Services
   ========================================================================== */

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
  margin-top: var(--space-12);
}

.service-card {
  background: transparent;
  border: var(--border-width) solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  transition: border-color var(--duration-fast) var(--ease-default);
}

.service-card:hover {
  border-color: var(--border-accent);
}

.service-card__icon {
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

.service-card__title {
  font-size: var(--text-h3);
  font-weight: 600;
  margin-top: var(--space-4);
  line-height: 1.3;
}

.service-card__text {
  font-size: var(--text-body);
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Cases
   ========================================================================== */

.cases-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
  margin-top: var(--space-12);
}

.case--featured {
  background: var(--bg-accent-subtle);
  border-left: var(--border-width-thick) solid var(--color-accent);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
}

.case__grid {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

.case__badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: transparent;
  color: var(--color-badge);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border: var(--border-width) solid var(--border-default);
  border-radius: var(--radius-full);
}

.case__title {
  font-size: var(--text-h3);
  font-weight: 600;
  margin-top: var(--space-3);
  line-height: 1.3;
}

.case__blocks {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.case__label {
  display: block;
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.case__text {
  font-size: var(--text-body);
  color: var(--text-secondary);
}

.case__stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.case__tag {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: var(--border-width) solid var(--border-subtle);
}

.case__mockup {
  width: 100%;
}

.mockup-window {
  aspect-ratio: 16 / 10;
  background: var(--bg-elevated);
  border: var(--border-width) solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.mockup-window__titlebar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-page);
  border-bottom: var(--border-width) solid var(--border-subtle);
}

.mockup-window__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--border-default);
}

.mockup-window__title {
  margin-left: var(--space-2);
  font-size: var(--text-body-sm);
  color: var(--text-muted);
}

.mockup-window__body {
  flex: 1;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mockup-row {
  height: 10px;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  width: 75%;
}

.mockup-row--wide { width: 90%; }
.mockup-row--short { width: 45%; }
.mockup-row--accent {
  background: var(--color-accent-muted);
  width: 60%;
}

@media (min-width: 1024px) {
  .case__grid {
    grid-template-columns: 55% 45%;
    gap: var(--space-12);
  }

  .case--reverse .case__grid {
    grid-template-columns: 45% 55%;
  }

  .case--reverse .case__mockup {
    order: -1;
  }
}

/* ==========================================================================
   Process Timeline
   ========================================================================== */

.process {
  margin-top: var(--space-12);
}

.process__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  position: relative;
}

.process__step {
  position: relative;
  padding-left: 56px;
}

.process__step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 40px;
  bottom: calc(-1 * var(--space-8));
  width: 1px;
  background: var(--border-default);
}

.process__step:last-child::before {
  display: none;
}

.process__number {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  color: var(--color-accent);
  font-weight: 600;
  font-size: var(--text-body);
  border: var(--border-width) solid var(--color-accent);
  border-radius: var(--radius-full);
}

.process__title {
  font-size: var(--text-h3);
  font-weight: 600;
  line-height: 1.3;
}

.process__text {
  font-size: var(--text-body);
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

@media (min-width: 1024px) {
  .process__list {
    flex-direction: row;
    gap: var(--space-6);
  }

  .process__step {
    flex: 1;
    padding-left: 0;
    padding-top: 56px;
    text-align: center;
  }

  .process__step::before {
    left: calc(50% + 24px);
    right: calc(-50% + 24px);
    top: 19px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .process__step:last-child::before {
    display: none;
  }

  .process__number {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* ==========================================================================
   Contact
   ========================================================================== */

.contact__grid {
  display: grid;
  gap: var(--space-12);
  margin-top: var(--space-12);
}

.contact__heading {
  font-size: var(--text-h2);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: 1.2;
}

.contact__lead {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  margin-top: var(--space-4);
  line-height: 1.65;
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-field__label {
  display: block;
  font-size: var(--text-body-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.form-field__input {
  width: 100%;
  padding: var(--space-3) 0;
  background: transparent;
  border: none;
  border-bottom: var(--border-width) solid var(--border-default);
  border-radius: 0;
  color: var(--text-primary);
  font-size: var(--text-body);
  transition: border-color var(--duration-fast) var(--ease-default);
}

.form-field__input::placeholder {
  color: var(--text-muted);
}

.form-field__input:focus {
  outline: none;
  border-bottom-color: var(--color-accent);
  box-shadow: var(--focus-ring);
}

textarea.form-field__input {
  min-height: 100px;
  resize: vertical;
}

.form-field--error .form-field__input {
  border-bottom-color: var(--color-error);
}

@media (min-width: 768px) {
  .contact__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  border-top: var(--border-width) solid var(--border-subtle);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-block: var(--space-10);
}

.footer__copy {
  font-size: var(--text-body-sm);
  color: var(--text-muted);
}

/* ==========================================================================
   Back to Top
   ========================================================================== */

.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: var(--z-back-to-top);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: var(--border-width) solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: var(--transition-colors), opacity var(--duration-normal) var(--ease-default),
              visibility var(--duration-normal) var(--ease-default);
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--border-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   Toast
   ========================================================================== */

.toast {
  position: fixed;
  bottom: var(--space-8);
  left: 50%;
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: 400px;
  width: calc(100% - var(--space-8));
  padding: var(--space-4) var(--space-6);
  background: var(--bg-surface);
  border: var(--border-width) solid var(--border-accent);
  border-radius: var(--radius-lg);
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.toast__icon {
  flex-shrink: 0;
  color: var(--color-success);
}

.toast__message {
  font-size: var(--text-body);
  color: var(--text-primary);
}

@media (min-width: 1024px) {
  .back-to-top {
    right: calc(var(--nav-rail-width) + var(--space-8));
  }
}