/* ============================================================
   Tensei — ISP Website Stylesheet
   ============================================================ */

/* Design Tokens */
:root {
  --bg-primary:   #0a0f1e;
  --bg-secondary: #0d1635;
  --bg-card:      #111c3d;
  --accent-cyan:  #00d4ff;
  --accent-blue:  #0066cc;
  --text-primary: #ffffff;
  --text-muted:   #8892a4;
  --border:       rgba(0, 212, 255, 0.15);
  --shadow:       0 4px 24px rgba(0, 0, 0, 0.4);
  --radius:       12px;
  --transition:   0.3s ease;
  --max-width:    1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

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

a:hover {
  color: #fff;
}

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

ul {
  list-style: none;
}

/* ============================================================
   UTILITIES
   ============================================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
}

.section-header {
  margin-bottom: 56px;
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-subtitle {
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #fff;
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 212, 255, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-blue {
  background: var(--accent-blue);
  color: #fff;
}

.btn-blue:hover {
  background: #0077ee;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 102, 204, 0.4);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* ============================================================
   NAVIGATION
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.5);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

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

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.07);
}

.nav__link.active {
  color: var(--accent-cyan);
}

.nav__cta {
  margin-left: 12px;
}

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: center;
}

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

.nav__toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

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

/* Mobile menu */
.nav__mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
  background: rgba(10, 15, 30, 0.98);
}

.nav__mobile.open {
  display: flex;
}

.nav__mobile .nav__link {
  padding: 12px 16px;
  font-size: 1rem;
}

.nav__mobile .btn {
  margin-top: 8px;
  justify-content: center;
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  padding-top: 68px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(0, 102, 204, 0.15) 0%, transparent 65%),
    radial-gradient(ellipse 40% 40% at 20% 70%, rgba(0, 212, 255, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

/* Grid dots background */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(0, 212, 255, 0.12) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  opacity: 0.5;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.4); }
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero__title .accent {
  color: var(--accent-cyan);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-cyan), transparent);
  animation: scrollDown 1.6s ease-in-out infinite;
}

@keyframes scrollDown {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Page hero (non-index) */
.page-hero {
  padding: 140px 0 80px;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 70% 50%, rgba(0, 102, 204, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero__content {
  position: relative;
  z-index: 1;
}

.page-hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.page-hero__subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
}

/* ============================================================
   SERVICES STRIP (Home)
   ============================================================ */

.services-strip {
  background: var(--bg-secondary);
  padding: 80px 0;
}

.services-strip__grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}

/* First 3 cards: 2 columns each → fills the 6-col row */
.services-strip__grid .service-card:nth-child(-n+3) {
  grid-column: span 2;
}

/* Cards 4 & 5: centered on the second row */
.services-strip__grid .service-card:nth-child(4) {
  grid-column: 2 / span 2;
}

.services-strip__grid .service-card:nth-child(5) {
  grid-column: 4 / span 2;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  background: rgba(0, 212, 255, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.6rem;
}

.service-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card__desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.service-card__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}

.service-card__link:hover {
  gap: 10px;
  color: var(--accent-cyan);
}

/* ============================================================
   WHY CHOOSE US
   ============================================================ */

.why {
  background: var(--bg-primary);
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.why__item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color var(--transition);
}

.why__item:hover {
  border-color: rgba(0, 212, 255, 0.3);
}

.why__icon {
  font-size: 2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.why__stat {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 6px;
}

.why__label {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* ============================================================
   CTA BANNER
   ============================================================ */

.cta-banner {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, #0d2060 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 50% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner__content {
  position: relative;
  z-index: 1;
}

.cta-banner__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner__title span {
  color: var(--accent-cyan);
}

.cta-banner__text {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 36px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   SERVICES PAGE
   ============================================================ */

.services-detail {
  background: var(--bg-primary);
}

.service-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}

.service-section:last-child {
  border-bottom: none;
}

.service-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.service-section__inner.reverse {
  direction: rtl;
}

.service-section__inner.reverse > * {
  direction: ltr;
}

.service-section__visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  position: relative;
  overflow: hidden;
}

.service-section__visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
}

.service-section__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.service-section__title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.service-section__desc {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 1rem;
  line-height: 1.7;
}

.service-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.service-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.service-feature__check {
  width: 20px;
  height: 20px;
  background: rgba(0, 212, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-cyan);
  font-size: 0.7rem;
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */

.contact-section {
  background: var(--bg-primary);
  padding: 80px 0;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}

/* Form */
.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.contact-form-card__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-form-card__subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.form-label .required {
  color: var(--accent-cyan);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition), background var(--transition);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: rgba(136, 146, 164, 0.6);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.04);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: #ff4d6a;
}

.form-error {
  display: none;
  color: #ff4d6a;
  font-size: 0.8rem;
  margin-top: 6px;
}

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

.form-select {
  cursor: pointer;
  appearance: none;
  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='%238892a4' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-select option {
  background: var(--bg-card);
  color: var(--text-primary);
}

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

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
}

/* Success message */
.form-success {
  display: none;
  background: rgba(0, 212, 100, 0.1);
  border: 1px solid rgba(0, 212, 100, 0.3);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  color: #00d464;
  margin-top: 20px;
}

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

.form-success__icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.form-success__title {
  font-weight: 700;
  margin-bottom: 4px;
}

.form-success__text {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Info cards */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color var(--transition);
}

.info-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
}

.info-card__icon {
  width: 44px;
  height: 44px;
  background: rgba(0, 212, 255, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.info-card__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.info-card__value {
  font-weight: 600;
  margin-bottom: 2px;
}

.info-card__detail {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer__logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.footer__logo span {
  color: var(--accent-cyan);
}

.footer__tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

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

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

.footer__link:hover {
  color: var(--text-primary);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__domain {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__domain a {
  color: var(--accent-cyan);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 968px) {
  .services-strip__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  /* Reset nth-child overrides on mobile */
  .services-strip__grid .service-card:nth-child(-n+3),
  .services-strip__grid .service-card:nth-child(4),
  .services-strip__grid .service-card:nth-child(5) {
    grid-column: span 1;
  }

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

  .service-section__inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .service-section__inner.reverse {
    direction: ltr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
    max-width: 320px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .contact-form-card {
    padding: 28px 20px;
  }

  .footer__links {
    flex-direction: column;
    gap: 12px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ============================================================
   SCROLL FADE-IN ANIMATION
   ============================================================ */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero__title {
    font-size: 2rem;
  }

  .page-hero {
    padding: 120px 0 60px;
  }
}