/* ============================================================
   IntegraTech Consult — Styles
   Modern, minimalist, professional landing page
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-white: #ffffff;
  --color-bg: #f8fbff;
  --color-bg-alt: #f0f6ff;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --section-padding: 6rem 0;
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Misc */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(59, 130, 246, 0.06);
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  --header-height: 4rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-700);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

ul {
  list-style: none;
}

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

/* ---------- Utility: Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---------- Utility: Section ---------- */
.section {
  padding: var(--section-padding);
}

/* ---------- Utility: Button ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-weight: 600;
  font-size: var(--font-size-base);
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-primary-500);
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.btn--primary:hover {
  background-color: var(--color-primary-600);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

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

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-gray-900);
  z-index: 10;
}

.logo-icon svg {
  display: block;
}

.logo-accent {
  color: var(--color-primary-500);
  font-weight: 500;
}

/* Nav */
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  padding: 0.25rem 0;
  transition: color var(--transition-base);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-500);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary-600);
}

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

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 10;
  padding: 0;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-gray-700);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.hamburger.open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger.open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
  background: linear-gradient(170deg, var(--color-white) 0%, var(--color-primary-50) 60%, var(--color-primary-100) 100%);
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
  padding: 4rem 0;
}

.hero__content {
  max-width: 580px;
}

.hero__tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary-600);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.hero__title {
  font-size: clamp(2rem, 4.5vw, var(--font-size-5xl));
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-gray-900);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 520px;
}

.hero__cta {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-base);
}

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

.hero__illustration {
  width: 100%;
  max-width: 440px;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* Scroll hint */
.hero__scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-hint span {
  display: block;
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-primary-300);
  border-radius: 12px;
  position: relative;
}

.hero__scroll-hint span::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  width: 4px;
  height: 8px;
  background-color: var(--color-primary-400);
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scroll-down 2s ease-in-out infinite;
}

@keyframes scroll-down {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 22px; }
}

/* ============================================================
   SECTION HEADER (Shared)
   ============================================================ */
.section__header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 4rem;
}

.section__tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary-500);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.section__title {
  font-size: clamp(1.75rem, 3vw, var(--font-size-4xl));
  font-weight: 700;
  color: var(--color-gray-900);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section__title--left {
  text-align: left;
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ============================================================
   SERVICES SECTION
   ============================================================ */
.services {
  background-color: var(--color-white);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-400), var(--color-primary-600));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--color-primary-200);
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}

.card:hover::before {
  opacity: 1;
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.5rem;
}

.card__icon svg {
  width: 100%;
  height: 100%;
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card__text {
  font-size: var(--font-size-base);
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ============================================================
   EXPERTISE SECTION
   ============================================================ */
.expertise {
  background-color: var(--color-bg);
}

.expertise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.expertise__card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-base);
}

.expertise__card:hover {
  border-color: var(--color-primary-200);
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}

.expertise__icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 1.25rem;
}

.expertise__icon svg {
  width: 100%;
  height: 100%;
}

.expertise__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: 0.5rem;
}

.expertise__text {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about {
  background-color: var(--color-white);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about__visual {
  display: flex;
  justify-content: center;
}

.about__pattern {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.about__pattern svg {
  width: 100%;
  height: auto;
}

.about__content .section__tag {
  text-align: left;
}

.about__text {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about__list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.about__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: var(--font-size-base);
  color: var(--color-gray-700);
  font-weight: 500;
  line-height: 1.5;
}

.about__list li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact {
  background-color: var(--color-bg);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: start;
}

/* Form */
.contact__form {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
}

.form__group {
  margin-bottom: 1.5rem;
}

.form__label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: 0.5rem;
}

.form__input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  background-color: var(--color-gray-50);
  color: var(--color-gray-800);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}

.form__input::placeholder {
  color: var(--color-gray-400);
}

.form__input:focus {
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
  background-color: var(--color-white);
}

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

/* Contact info card */
.contact__info-card {
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-700));
  color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
}

.contact__info-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact__details li {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  font-size: var(--font-size-base);
  opacity: 0.95;
}

.contact__details li svg {
  flex-shrink: 0;
  stroke: var(--color-white);
  opacity: 0.85;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: 3.5rem 0 0;
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-gray-700);
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  margin-top: 0.75rem;
  line-height: 1.6;
}

.footer .header__logo .logo-text {
  color: var(--color-white);
}

.footer__nav-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-gray-300);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer__nav-list a {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  transition: color var(--transition-base);
}

.footer__nav-list a:hover {
  color: var(--color-primary-400);
}

.footer__social-links {
  display: flex;
  gap: 0.75rem;
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--color-gray-400);
  transition: all var(--transition-base);
}

.footer__social-link:hover {
  background-color: var(--color-primary-500);
  color: var(--color-white);
}

.footer__bottom {
  padding: 1.5rem 0;
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ============================================================
   RESPONSIVE — Tablet (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --section-padding: 4.5rem 0;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
    padding: 3rem 0;
  }

  .hero__content {
    max-width: 100%;
  }

  .hero__subtitle {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero__visual {
    order: -1;
  }

  .hero__illustration {
    max-width: 320px;
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .expertise__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about__visual {
    order: -1;
  }

  .about__content .section__tag,
  .about__content .section__title {
    text-align: center;
  }

  .about__pattern {
    max-width: 320px;
  }

  .contact__grid {
    grid-template-columns: 1fr;
  }

  .footer__top {
    grid-template-columns: 1fr 1fr;
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   RESPONSIVE — Mobile (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 3.5rem 0;
    --container-padding: 1.25rem;
    --header-height: 3.5rem;
  }

  /* Mobile nav */
  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 5;
  }

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

  .nav__list {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }

  .nav__link {
    font-size: var(--font-size-xl);
  }

  /* Hero */
  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 2rem);
    padding-bottom: 3rem;
  }

  .hero__illustration {
    max-width: 260px;
  }

  .hero__cta {
    width: 100%;
    justify-content: center;
  }

  .hero__scroll-hint {
    display: none;
  }

  /* Services */
  .services__grid {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 2rem;
  }

  /* Expertise */
  .expertise__grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact__form {
    padding: 1.75rem;
  }

  /* Footer */
  .footer__top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer__brand {
    grid-column: auto;
  }
}

/* ============================================================
   RESPONSIVE — Small Mobile (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .hero__title {
    font-size: 1.75rem;
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .section__header {
    margin-bottom: 2.5rem;
  }
}