/* ========================================
   ProjectStack Web Solutions — Styles
   ======================================== */

:root {
  /* Brand Colors — extracted from logo */
  --blue-100: #e0f0ff;
  --blue-200: #a8d8ff;
  --blue-300: #5eb8ff;
  --blue-400: #2d9cdb;
  --blue-500: #1a8fd4;
  --blue-600: #0e6fad;
  --cyan-400: #4ecfef;
  --cyan-500: #28b8db;
  
  /* Dark palette */
  --dark-950: #070b12;
  --dark-900: #0b1120;
  --dark-850: #0f1729;
  --dark-800: #131d33;
  --dark-700: #1a2640;
  --dark-600: #243352;
  --dark-500: #2f4165;
  
  /* Grays */
  --gray-100: #e8ecf2;
  --gray-200: #c5cdd8;
  --gray-300: #9aa8ba;
  --gray-400: #6e7f96;
  --gray-500: #4a5a6e;
  
  /* Accent */
  --accent: var(--cyan-400);
  --accent-glow: rgba(78, 207, 239, 0.15);
  
  /* Spacing */
  --section-pad: clamp(4rem, 10vw, 7rem);
  --container-max: 1200px;
  --container-pad: clamp(1.25rem, 4vw, 2rem);
  
  /* Typography */
  --font-heading: 'Chakra Petch', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  
  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-base: 0.3s var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  background: var(--dark-950);
  color: var(--gray-200);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--gray-100);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--gray-400);
  max-width: 520px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: none;
  cursor: pointer;
  border-radius: 6px;
  padding: 0.85rem 1.75rem;
  transition: all var(--transition-base);
}

.btn--primary {
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-500));
  color: #fff;
  box-shadow: 0 0 20px rgba(78, 207, 239, 0.15), 0 2px 8px rgba(0,0,0,0.3);
}
.btn--primary:hover {
  box-shadow: 0 0 30px rgba(78, 207, 239, 0.3), 0 4px 16px rgba(0,0,0,0.4);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--gray-200);
  border: 1px solid var(--dark-600);
}
.btn--ghost:hover {
  border-color: var(--blue-400);
  color: var(--blue-200);
}

.btn--full { width: 100%; justify-content: center; }
.btn--sm { padding: 0.6rem 1.25rem; font-size: 0.82rem; }

/* ---- Nav ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.75rem 0;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}
.nav.scrolled {
  background: rgba(7, 11, 18, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--dark-700);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}
.nav__logo-img { height: 36px; width: auto; }
.nav__wordmark {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gray-100);
}
.nav__wordmark--accent { color: var(--blue-400); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__links a {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gray-300);
  text-decoration: none;
  transition: color var(--transition-base);
}
.nav__links a:hover { color: var(--gray-100); }
.nav__links .nav__cta {
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-500));
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: 5px;
}
.nav__links .nav__cta:hover {
  box-shadow: 0 0 20px rgba(78, 207, 239, 0.2);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-200);
  border-radius: 2px;
  transition: var(--transition-base);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem var(--container-pad) 4rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(78,207,239,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(78,207,239,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 50%, black, transparent);
}
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
}
.hero__glow--1 {
  width: 500px;
  height: 500px;
  background: var(--blue-600);
  top: -10%;
  left: -5%;
}
.hero__glow--2 {
  width: 350px;
  height: 350px;
  background: var(--cyan-500);
  bottom: 10%;
  right: 5%;
  opacity: 0.15;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan-400);
  background: rgba(78, 207, 239, 0.08);
  border: 1px solid rgba(78, 207, 239, 0.15);
  padding: 0.4rem 1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s var(--ease-out) both;
}
.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-400);
  animation: pulse 2s ease-in-out infinite;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5.5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gray-100);
  margin-bottom: 1.25rem;
  animation: fadeInUp 0.6s 0.1s var(--ease-out) both;
}
.hero__title--accent {
  background: linear-gradient(135deg, var(--blue-300), var(--cyan-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--gray-300);
  max-width: 540px;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s 0.2s var(--ease-out) both;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s 0.3s var(--ease-out) both;
}

.hero__logo-mark {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 0;
  opacity: 0.06;
  pointer-events: none;
}
.hero__logo-img {
  width: clamp(300px, 35vw, 550px);
  height: auto;
}

/* ---- Problem Section ---- */
.problem {
  padding: var(--section-pad) 0;
  background: var(--dark-900);
  border-top: 1px solid var(--dark-700);
}
.problem__header { margin-bottom: 3rem; }
.problem__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}
.problem__card {
  background: var(--dark-850);
  border: 1px solid var(--dark-700);
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color var(--transition-base), transform var(--transition-base);
}
.problem__card:hover {
  border-color: var(--dark-500);
  transform: translateY(-2px);
}
.problem__icon {
  width: 40px;
  height: 40px;
  color: var(--blue-400);
  margin-bottom: 1rem;
}
.problem__icon svg { width: 100%; height: 100%; }
.problem__card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-100);
  margin-bottom: 0.5rem;
}
.problem__card p {
  font-size: 0.9rem;
  color: var(--gray-400);
  line-height: 1.55;
}

/* ---- Services Section ---- */
.services {
  padding: var(--section-pad) 0;
}
.services__header { margin-bottom: 3rem; }
.services__grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.service-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.75rem;
  align-items: start;
  padding: 2rem 0;
  border-bottom: 1px solid var(--dark-700);
  transition: all var(--transition-base);
}
.service-card:first-child { border-top: 1px solid var(--dark-700); }
.service-card:hover { padding-left: 1rem; }

.service-card__number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--dark-600);
  line-height: 1;
  transition: color var(--transition-base);
  min-width: 60px;
}
.service-card:hover .service-card__number { color: var(--blue-500); }
.service-card__line { display: none; }

.service-card__content h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-100);
  margin-bottom: 0.4rem;
}
.service-card__content p {
  font-size: 0.95rem;
  color: var(--gray-400);
  max-width: 560px;
}

/* ---- Process Section ---- */
.process {
  padding: var(--section-pad) 0;
  background: var(--dark-900);
  border-top: 1px solid var(--dark-700);
}
.process__header { margin-bottom: 3rem; }
.process__steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: start;
}

.process__step {
  text-align: center;
  padding: 0 0.75rem;
}
.process__step-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--blue-500);
  margin-bottom: 1rem;
}
.process__step-content h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-100);
  margin-bottom: 0.5rem;
}
.process__step-content p {
  font-size: 0.88rem;
  color: var(--gray-400);
  line-height: 1.55;
}

.process__connector {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-500), var(--cyan-500));
  margin-top: 1.5rem;
  border-radius: 2px;
  opacity: 0.4;
}

/* ---- About Section ---- */
.about {
  padding: var(--section-pad) 0;
}
.about__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.about__text p {
  margin-bottom: 1rem;
  color: var(--gray-300);
}
.about__text p:last-of-type { margin-bottom: 2rem; }

.about__pillars {
  display: flex;
  gap: 2rem;
}
.about__pillar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.about__pillar-icon {
  width: 40px;
  height: 40px;
  color: var(--blue-400);
}
.about__pillar-icon svg { width: 100%; height: 100%; }
.about__pillar span {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-300);
}

.about__visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}
.about__badge-wrap {
  position: relative;
}
.about__badge-img {
  width: 220px;
  height: auto;
  filter: drop-shadow(0 0 30px rgba(78, 207, 239, 0.1));
}
.about__stats {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  max-width: 280px;
}
.about__stat {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--dark-700);
}
.about__stat-label {
  font-size: 0.82rem;
  color: var(--gray-500);
}
.about__stat-value {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-200);
}

/* ---- Contact Section ---- */
.contact {
  padding: var(--section-pad) 0;
  background: var(--dark-900);
  border-top: 1px solid var(--dark-700);
}
.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.contact__info p {
  color: var(--gray-300);
  margin-bottom: 2rem;
  max-width: 440px;
}
.contact__details {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.contact__detail {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray-300);
  font-size: 0.9rem;
}
.contact__detail svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--blue-400);
}
.contact__detail a {
  color: var(--gray-200);
  text-decoration: none;
  transition: color var(--transition-base);
}
.contact__detail a:hover { color: var(--accent); }

.contact__form-wrap {
  background: var(--dark-850);
  border: 1px solid var(--dark-700);
  border-radius: 12px;
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}
.form-group label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--gray-200);
  margin-bottom: 0.4rem;
}
.form-group .optional {
  color: var(--gray-500);
  font-weight: 400;
}
.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--gray-100);
  background: var(--dark-800);
  border: 1px solid var(--dark-600);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-500);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(26, 143, 212, 0.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.form-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 0.75rem;
}

.contact__success {
  text-align: center;
  padding: 2rem 0;
}
.contact__success-icon {
  width: 48px;
  height: 48px;
  color: var(--cyan-400);
  margin: 0 auto 1rem;
}
.contact__success-icon svg { width: 100%; height: 100%; }
.contact__success h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--gray-100);
  margin-bottom: 0.5rem;
}
.contact__success p { color: var(--gray-400); }

/* ---- Footer ---- */
.footer {
  padding: 3rem 0 1.5rem;
  border-top: 1px solid var(--dark-700);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--dark-800);
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.footer__logo { height: 32px; width: auto; }
.footer__wordmark {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gray-100);
}
.footer__wordmark--accent { color: var(--blue-400); }
.footer__tagline {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-left: 0.5rem;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}
.footer__links a {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-base);
}
.footer__links a:hover { color: var(--gray-200); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 1.5rem;
}
.footer__bottom p {
  font-size: 0.78rem;
  color: var(--gray-500);
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ---- Scroll Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ======== Responsive ======== */
@media (max-width: 900px) {
  .process__steps {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .process__connector {
    width: 2px;
    height: 30px;
    margin: 0 auto;
  }
  .about__layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .about__visual { order: -1; }
  .contact__layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .nav__links { 
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    background: var(--dark-900);
    border-left: 1px solid var(--dark-700);
    flex-direction: column;
    padding: 5rem 2rem 2rem;
    gap: 1.5rem;
    z-index: 200;
  }
  .nav__links.open { display: flex; }
  .nav__links .nav__cta {
    text-align: center;
    margin-top: 1rem;
  }
  .nav__toggle { display: flex; z-index: 300; }
  
  .hero {
    text-align: left;
    padding-top: 7rem;
    min-height: auto;
    padding-bottom: 4rem;
  }
  .hero__logo-mark { display: none; }
  
  .problem__grid {
    grid-template-columns: 1fr;
  }
  
  .service-card {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .service-card__number { font-size: 1.5rem; }
  .service-card:hover { padding-left: 0; }
  
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .footer__bottom { flex-direction: column; gap: 0.25rem; }
}