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

:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #737373;
  --color-text-tertiary: #a3a3a3;
  --color-border: #e5e5e5;
  --color-accent: #4f6ef7;
  --color-accent-hover: #3b5ce5;
  --color-success: #16a34a;
  --color-error: #dc2626;
  --gradient-accent: linear-gradient(135deg, #4f6ef7, #7c5cfc);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nav-height: 72px;
  --container-max: 1100px;
  --container-padding: 24px;
  --section-padding: 120px;
  --section-padding-sm: 80px;

  --radius-sm: 4px;
  --radius-md: 8px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration: 0.4s;
  --duration-fast: 0.2s;
}

/* Dark mode — manual toggle */
[data-theme="dark"] {
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-text: #fafafa;
  --color-text-secondary: #a3a3a3;
  --color-text-tertiary: #525252;
  --color-border: #262626;
  --color-accent: #6b8aff;
  --color-accent-hover: #8aa0ff;
  --gradient-accent: linear-gradient(135deg, #6b8aff, #9b7cfc);
}

/* Dark mode — auto (system preference, when no manual override) */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-text: #fafafa;
    --color-text-secondary: #a3a3a3;
    --color-text-tertiary: #525252;
    --color-border: #262626;
    --color-accent: #6b8aff;
    --color-accent-hover: #8aa0ff;
    --gradient-accent: linear-gradient(135deg, #6b8aff, #9b7cfc);
  }
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  transition: background-color var(--duration) var(--ease-in-out),
              color var(--duration) var(--ease-in-out);
}

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

ul {
  list-style: none;
}

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

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

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

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

/* =========================================
   Navigation
   ========================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: background-color var(--duration) var(--ease-in-out),
              border-color var(--duration) var(--ease-in-out);
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.5px;
  color: var(--color-text);
  transition: opacity var(--duration-fast);
}

.nav__logo:hover {
  opacity: 0.7;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--duration-fast);
}

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

.nav__link.active::after,
.nav__link:hover::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast), background-color var(--duration-fast);
  margin-left: 8px;
}

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

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .theme-toggle .icon-sun {
    display: block;
  }

  [data-theme="auto"] .theme-toggle .icon-moon {
    display: none;
  }
}

/* Hamburger */
.nav__toggle {
  display: none;
  width: 32px;
  height: 32px;
  position: relative;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  position: absolute;
  left: 4px;
  transition: transform var(--duration-fast), opacity var(--duration-fast);
}

.nav__toggle span:first-child {
  top: 11px;
}

.nav__toggle span:last-child {
  top: 19px;
}

.nav__toggle.active span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav__toggle.active span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
  padding: 160px 0 var(--section-padding);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero__content {
  max-width: 780px;
}

.hero__greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.hero__title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2.5px;
  margin-bottom: 28px;
}

.hero__title .line {
  display: block;
  overflow: hidden;
}

.hero__title .line > span {
  display: block;
  transform: translateY(100%);
  animation: slideReveal 0.8s var(--ease-out) forwards;
}

.hero__title .line:nth-child(1) > span {
  animation-delay: 0.1s;
}

.hero__title .line:nth-child(2) > span {
  animation-delay: 0.25s;
}

.hero__title .line:nth-child(3) > span {
  animation-delay: 0.4s;
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease-out) 0.55s forwards;
}

.hero__actions {
  opacity: 0;
  animation: fadeUp 0.7s var(--ease-out) 0.7s forwards;
}

/* =========================================
   Buttons
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  transition: opacity var(--duration-fast);
  white-space: nowrap;
}

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

.btn--primary:hover {
  opacity: 0.85;
}

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

/* =========================================
   Dividers
   ========================================= */
.divider {
  border: none;
  height: 1px;
  background: var(--color-border);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0;
  transition: background-color var(--duration) var(--ease-in-out);
}

/* =========================================
   Highlights Section (formerly Features)
   ========================================= */
.highlights {
  padding: var(--section-padding-sm) 0;
}

.highlights__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.highlight__title {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 8px;
}

.highlight__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* =========================================
   How It Works
   ========================================= */
.how-it-works {
  padding: var(--section-padding) 0;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -1.5px;
  margin-bottom: 56px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.step__number {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-border);
  line-height: 1;
  letter-spacing: -2px;
  margin-bottom: 16px;
  transition: color var(--duration) var(--ease-in-out);
}

.step__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.step__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

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

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}

.about__photo-placeholder {
  aspect-ratio: 4 / 5;
  background: var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color var(--duration) var(--ease-in-out);
}

.about__heading {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.about__content p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

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

/* =========================================
   Services List
   ========================================= */
.services {
  padding: calc(var(--section-padding) + 24px) 0 var(--section-padding);
}

.services .section-title {
  text-align: center;
}

.services__subtitle {
  font-size: 1.1875rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin-top: -40px;
  margin-bottom: 56px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.service-row {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  padding: 36px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
  transition: border-color var(--duration) var(--ease-in-out);
}

.service-row:first-of-type {
  border-top: 1px solid var(--color-border);
}

.service-row__number {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.service-row__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.3;
}

.service-row__content p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.service-row__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.service-row__list li {
  font-size: 0.9375rem;
  color: var(--color-text);
  padding-left: 28px;
  position: relative;
}

.service-row__list li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-text-tertiary);
}

/* =========================================
   Contact Section
   ========================================= */
.contact {
  padding: calc(var(--section-padding) + 24px) 0 var(--section-padding);
}

.contact__heading {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -2px;
  margin-bottom: 40px;
  text-align: center;
}

.contact__direct {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  text-align: center;
}

.contact__direct a {
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-border);
  transition: text-decoration-color var(--duration-fast), opacity var(--duration-fast);
}

.contact__direct a:hover {
  text-decoration-color: var(--color-text);
  opacity: 0.7;
}

.contact__direct span {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.contact__availability {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: 56px;
  line-height: 1.7;
  text-align: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Form */
.contact-form {
  width: 100%;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.2px;
}

.form-input {
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast),
              background-color var(--duration) var(--ease-in-out),
              color var(--duration) var(--ease-in-out);
  outline: none;
  -webkit-appearance: none;
}

.form-input::placeholder {
  color: var(--color-text-tertiary);
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.1);
}

[data-theme="dark"] .form-input:focus {
  box-shadow: 0 0 0 3px rgba(107, 138, 255, 0.15);
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .form-input:focus {
    box-shadow: 0 0 0 3px rgba(107, 138, 255, 0.15);
  }
}

.form-input.error {
  border-color: var(--color-error);
}

.form-input.error:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  font-size: 0.8125rem;
  color: var(--color-error);
  display: none;
}

.form-error.visible {
  display: block;
}

.form-success {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 20px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  color: var(--color-success);
  font-weight: 500;
}

[data-theme="dark"] .form-success {
  background: #052e16;
  border-color: #166534;
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .form-success {
    background: #052e16;
    border-color: #166534;
  }
}

.form-success.visible {
  display: flex;
}

/* =========================================
   Footer
   ========================================= */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--color-border);
  transition: border-color var(--duration) var(--ease-in-out);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer__signature {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
}

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

.back-to-top {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast);
  margin-top: 8px;
}

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

/* =========================================
   Animations
   ========================================= */
@keyframes slideReveal {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

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

.anim-fade {
  opacity: 0;
}

.anim-fade.in-view {
  animation: fadeUp 0.7s var(--ease-out) forwards;
}

/* Stagger children in view */
.highlights__grid .highlight:nth-child(1).in-view { animation-delay: 0s; }
.highlights__grid .highlight:nth-child(2).in-view { animation-delay: 0.1s; }
.highlights__grid .highlight:nth-child(3).in-view { animation-delay: 0.2s; }

.steps .step:nth-child(1).in-view { animation-delay: 0s; }
.steps .step:nth-child(2).in-view { animation-delay: 0.12s; }
.steps .step:nth-child(3).in-view { animation-delay: 0.24s; }

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 900px) {
  .highlights__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .service-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-row__list {
    grid-template-columns: 1fr;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about__photo-placeholder {
    max-width: 320px;
    aspect-ratio: 1;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
    --container-padding: 20px;
    --section-padding: 80px;
    --section-padding-sm: 56px;
  }

  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-fast), visibility var(--duration-fast),
                background-color var(--duration) var(--ease-in-out);
  }

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

  .nav__link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .theme-toggle {
    margin-left: 0;
  }

  .hero {
    padding: 120px 0 var(--section-padding);
    min-height: auto;
  }

  .hero__title {
    letter-spacing: -1.5px;
  }

  .section-title {
    margin-bottom: 40px;
  }

  .step__number {
    font-size: 3rem;
  }

  .contact__heading {
    letter-spacing: -1.5px;
  }

  .footer__inner {
    gap: 12px;
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding: 64px;
    --section-padding-sm: 48px;
  }

  .hero__title {
    font-size: clamp(2.25rem, 10vw, 3rem);
    letter-spacing: -1px;
  }

  .contact__heading {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .contact-form {
    max-width: 100%;
  }
}