/* ============================================================
   Hellenic Web3 Studio – Stylesheet
   ============================================================ */

/* 1. CSS Custom Properties */
:root {
  /* Palette */
  --color-bg: #06091a;
  --color-bg-alt: #0c1230;
  --color-surface: #111c3a;
  --color-surface-hover: #182348;
  --color-border: rgba(255, 255, 255, 0.08);

  --color-gold: #f0b429;
  --color-gold-light: #fcd34d;
  --color-gold-dark: #b7860d;

  --color-blue: #3b82f6;
  --color-blue-light: #60a5fa;

  --color-text: #e8eaf6;
  --color-text-muted: #8892b0;
  --color-text-light: #ffffff;

  /* Gradients */
  --gradient-gold: linear-gradient(135deg, #f0b429 0%, #fcd34d 50%, #f0b429 100%);
  --gradient-hero: linear-gradient(160deg, #06091a 0%, #0c1a3a 50%, #0a1628 100%);
  --gradient-text: linear-gradient(135deg, #f0b429 0%, #fcd34d 40%, #f9a825 100%);
  --gradient-card: linear-gradient(145deg, #111c3a 0%, #0d1630 100%);

  /* Typography */
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Space Grotesk", "Inter", sans-serif;

  /* Spacing */
  --container-max: 1200px;
  --section-gap: 7rem;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-gold: 0 0 24px rgba(240, 180, 41, 0.25);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transition */
  --transition: 0.25s ease;
}

/* 2. Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-gold-light);
}

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

ul {
  list-style: none;
}

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

/* 3. Utility */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

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

.section {
  padding-block: var(--section-gap);
}

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

.section__header {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 4rem;
}

.section__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  border: 1px solid rgba(240, 180, 41, 0.35);
  border-radius: 100px;
  padding: 0.3rem 1rem;
  margin-bottom: 1rem;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--color-text-light);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* 4. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  line-height: 1;
  white-space: nowrap;
}

.btn--primary {
  background: var(--gradient-gold);
  color: #0a1628;
}

.btn--primary:hover {
  box-shadow: var(--shadow-gold);
  transform: translateY(-1px);
  color: #06091a;
}

.btn--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}

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

.btn--lg {
  padding: 0.85rem 2rem;
  font-size: 1rem;
}

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

/* 5. Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(6, 9, 26, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 70px;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.nav__logo:hover {
  color: var(--color-text-light);
}

.nav__logo-symbol {
  color: var(--color-gold);
  font-size: 1.4rem;
}

.nav__logo-accent {
  color: var(--color-gold);
}

.nav__links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.nav__cta {
  margin-left: 1rem;
  flex-shrink: 0;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  margin-left: auto;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  height: 2px;
  background: var(--color-text-light);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: left center;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(1px, -2px);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(1px, 2px);
}

/* 6. Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.hero__orb--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(240, 180, 41, 0.15) 0%, transparent 70%);
  top: -100px;
  right: -100px;
}

.hero__orb--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
  bottom: -80px;
  left: 5%;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding-block: 5rem;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 0.4rem 1rem;
  margin-bottom: 2rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  color: var(--color-text-light);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 580px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 4rem;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.hero__stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-gold);
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* 7. About */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about__text p {
  color: var(--color-text-muted);
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
  line-height: 1.85;
}

.about__list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.about__list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
}

.about__icon {
  color: var(--color-gold);
  font-size: 0.65rem;
}

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

.about__card {
  width: 380px;
  height: 380px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.about__card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about__hexgrid {
  position: relative;
  width: 200px;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hex {
  position: absolute;
  color: var(--color-gold);
  opacity: 0.8;
  animation: hexFloat 4s ease-in-out infinite;
  user-select: none;
}

.hex--lg {
  font-size: 5rem;
  opacity: 0.9;
  animation-delay: 0s;
}

.hex--md {
  font-size: 2.8rem;
  animation-delay: 0.8s;
}

.hex--top-right {
  top: -20px;
  right: -30px;
}

.hex--bottom-left {
  bottom: -20px;
  left: -30px;
}

.hex--sm {
  font-size: 1.8rem;
  opacity: 0.5;
  animation-delay: 1.6s;
}

.hex--top-left {
  top: 0;
  left: -50px;
}

.hex--bottom-right {
  bottom: 0;
  right: -50px;
}

@keyframes hexFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* 8. Services */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.services__grid--four {
  grid-template-columns: repeat(4, 1fr);
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all var(--transition);
}

.service-card:hover {
  background: var(--color-surface-hover);
  border-color: rgba(240, 180, 41, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-card__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.service-card__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 0.7rem;
}

.service-card__text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* 9. Contact */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.form-input {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.form-input::placeholder {
  color: rgba(136, 146, 176, 0.5);
}

.form-input:focus {
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(240, 180, 41, 0.15);
}

.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238892b0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-select option {
  background: var(--color-surface);
  color: var(--color-text);
}

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

.contact-form__status {
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.4em;
  transition: color var(--transition);
}

.contact-form__status--success {
  color: #4ade80;
}

.contact-form__status--error {
  color: #f87171;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-info-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.5rem;
}

.contact-info-card:first-child {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-light);
  flex-direction: column;
  gap: 0.3rem;
}

.contact-info-card:first-child p {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.contact-info-card__icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}

.contact-info-card div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.contact-info-card strong {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.contact-info-card a {
  font-size: 0.95rem;
  font-weight: 500;
}

/* 11. Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
  background: var(--color-bg);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  text-align: center;
}

.footer__logo {
  margin-bottom: 0.4rem;
}

.footer__tagline {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer__copy {
  font-size: 0.8rem;
  color: rgba(136, 146, 176, 0.6);
}

/* 12. Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 13. Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
}

.lang-btn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  line-height: 1;
}

.lang-btn:hover {
  color: var(--color-text-light);
}

.lang-btn--active {
  color: var(--color-gold);
  background: rgba(240, 180, 41, 0.1);
}

.lang-divider {
  color: var(--color-border);
  font-size: 0.75rem;
  user-select: none;
}

/* 14. Responsive */
@media (max-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  :root {
    --section-gap: 5rem;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .lang-switcher {
    margin-left: 0;
  }

  .nav__links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: rgba(6, 9, 26, 0.97);
    backdrop-filter: blur(14px);
    padding-block: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    z-index: 99;
  }

  .nav__links.open {
    display: flex;
  }

  .nav__link {
    padding: 0.8rem 2rem;
    font-size: 1rem;
    width: 100%;
    text-align: center;
  }

  .nav__hamburger {
    display: flex;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about__visual {
    order: -1;
  }

  .about__card {
    width: 280px;
    height: 280px;
  }

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

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

  .hero__stats {
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

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

  .about__card {
    width: 240px;
    height: 240px;
  }
}