/* dAvila Uratsuka — one-page clean */

:root {
  --ink: #0b3a4a;
  --ink-soft: #1a4f5f;
  --accent: #2bb3a3;
  --accent-deep: #1f8f82;
  --slate: #5a6b73;
  --muted: #8a9aa3;
  --line: #d7e1e6;
  --paper: #f4f7f8;
  --white: #ffffff;
  --hero-deep: #072833;
  --shadow: 0 24px 60px rgba(7, 40, 51, 0.12);
  --radius: 4px;
  --max: 1120px;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-display: "Instrument Serif", Georgia, serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(43, 179, 163, 0.12), transparent 55%),
    linear-gradient(180deg, #eef4f6 0%, var(--paper) 40%, var(--white) 100%);
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: var(--white);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(244, 247, 248, 0.82);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(244, 247, 248, 0.94);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink);
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  border-radius: 10px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.nav {
  margin-left: auto;
}

.nav-menu {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--slate);
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  padding: 0.6rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  margin: 6px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

.header-cta {
  flex-shrink: 0;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.88rem;
}

.btn-primary {
  background: var(--ink);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--ink-soft);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(244, 247, 248, 0.35);
}

.btn-ghost:hover {
  border-color: var(--paper);
  color: var(--white);
  background: rgba(244, 247, 248, 0.06);
}

/* Hero */

.hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: flex;
  align-items: flex-end;
  color: var(--paper);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(7, 40, 51, 0.92) 0%, rgba(11, 58, 74, 0.78) 48%, rgba(31, 143, 130, 0.35) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='0.06'%3E%3Cpath d='M0 40h160M0 80h160M0 120h160M40 0v160M80 0v160M120 0v160'/%3E%3C/g%3E%3C/svg%3E"),
    radial-gradient(circle at 70% 30%, #1f8f82 0%, transparent 42%),
    linear-gradient(160deg, var(--hero-deep), var(--ink));
  background-size: cover, 160px 160px, auto, auto;
  transform: scale(1.03);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from { transform: scale(1.02) translate3d(0, 0, 0); }
  to { transform: scale(1.06) translate3d(-1.5%, -1%, 0); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 7rem 0 5rem;
  max-width: 720px;
  margin-left: max(calc((100% - var(--max)) / 2), 1.25rem);
  margin-right: auto;
  width: min(100% - 2.5rem, 720px);
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
}

.hero h1 {
  font-family: var(--font-sans);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 500;
  line-height: 1.35;
  max-width: 22ch;
  margin: 0 0 1.25rem;
  color: rgba(244, 247, 248, 0.92);
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 38ch;
  color: rgba(244, 247, 248, 0.78);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* Reveal */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: revealUp 0.8s ease forwards;
}

.reveal.delay-1 { animation-delay: 0.12s; }
.reveal.delay-2 { animation-delay: 0.24s; }
.reveal.delay-3 { animation-delay: 0.36s; }

@keyframes revealUp {
  to {
    opacity: 1;
    transform: none;
  }
}

/* Sections */

.section {
  padding: 6.5rem 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 3.5rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.section-lead {
  margin: 0;
  color: var(--slate);
  max-width: 52ch;
}

/* Services */

.services {
  background: var(--white);
}

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.service-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: padding-left 0.25s ease, background 0.25s ease;
}

.service-item:hover {
  padding-left: 0.5rem;
}

.service-num {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 0.35rem;
}

.service-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.service-item p {
  margin: 0;
  color: var(--slate);
  max-width: 58ch;
}

/* Portfolio */

.portfolio {
  background:
    linear-gradient(180deg, var(--paper) 0%, #e8f0f2 100%);
}

.platform-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 3rem;
}

.platform-item {
  padding-top: 1.5rem;
  border-top: 2px solid var(--accent);
}

.platform-name {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.platform-desc {
  margin: 0;
  color: var(--slate);
  max-width: 36ch;
}

@media (max-width: 720px) {
  .platform-list {
    grid-template-columns: 1fr;
  }
}

/* About */

.about {
  background:
    linear-gradient(180deg, rgba(238, 244, 246, 0.7), rgba(244, 247, 248, 0.4));
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 3.5rem;
  align-items: start;
}

.about-copy p {
  color: var(--slate);
}

.about-copy p + p {
  margin-top: 1rem;
}

.about-aside ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.about-aside li {
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line);
}

.about-aside strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.05rem;
}

.about-aside span {
  color: var(--slate);
  font-size: 0.98rem;
}

/* Contact */

.contact {
  background: var(--ink);
  color: var(--paper);
}

.contact .eyebrow {
  color: var(--accent);
}

.contact .section-lead,
.contact .form-note {
  color: rgba(244, 247, 248, 0.72);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.contact-channels {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.channel-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.contact-channels a {
  color: var(--paper);
  font-size: 1.15rem;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid rgba(244, 247, 248, 0.25);
}

.contact-channels a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.contact-form {
  display: grid;
  gap: 1rem;
  padding: 1.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(244, 247, 248, 0.12);
}

.contact-form label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(244, 247, 248, 0.18);
  background: rgba(7, 40, 51, 0.35);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 0.85rem 0.95rem;
  font: inherit;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(244, 247, 248, 0.4);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

.contact-form .btn-primary {
  background: var(--accent);
  color: var(--hero-deep);
  margin-top: 0.25rem;
}

.contact-form .btn-primary:hover {
  background: #4ec4b6;
  color: var(--hero-deep);
}

.form-status {
  margin: 0;
  font-size: 0.92rem;
  color: var(--accent);
}

/* Footer */

.site-footer {
  background: var(--hero-deep);
  color: rgba(244, 247, 248, 0.7);
  padding: 2rem 0;
  border-top: 1px solid rgba(244, 247, 248, 0.08);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
  justify-content: space-between;
}

.brand-footer {
  color: var(--paper);
}

.brand-footer span {
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.footer-copy {
  margin: 0;
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  gap: 1.25rem;
}

.footer-nav a {
  color: rgba(244, 247, 248, 0.7);
  text-decoration: none;
  font-size: 0.9rem;
}

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

/* Responsive */

@media (max-width: 900px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .header-cta {
    display: none;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .nav-menu {
    position: absolute;
    right: 1.25rem;
    top: 4.25rem;
    flex-direction: column;
    gap: 0;
    min-width: 12rem;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 0.5rem 0;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .nav-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .nav-menu a {
    display: block;
    padding: 0.85rem 1.1rem;
  }

  .hero-inner {
    padding: 6rem 0 3.5rem;
  }

  .service-item {
    grid-template-columns: 3rem 1fr;
    gap: 1rem;
  }

  .section {
    padding: 4.5rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal,
  .hero-bg {
    animation: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  .btn:hover,
  .service-item:hover {
    transform: none;
    padding-left: 0;
  }
}