/* ============================================================
   TRUDI Solutions Inc. — Design System
   Theme: Tech Dark (Cyan/Teal) — developer-focused, Vercel/Linear style
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── CSS Variables ────────────────────────────────────────── */
:root {
  /* Colors — Tech Dark */
  --clr-bg:        #0d1117;
  --clr-bg-alt:    #161b22;
  --clr-surface:   #21262d;
  --clr-surface-2: #30363d;
  --clr-border:    #30363d;
  --clr-primary:   #22d3ee;
  --clr-primary-h: #06b6d4;
  --clr-gold:      #2dd4bf;
  --clr-gold-h:    #14b8a6;
  --clr-text:      #f0f6fc;
  --clr-muted:     #8b949e;
  --clr-muted-2:   #6e7681;

  /* Typography */
  --font-display: 'JetBrains Mono', monospace;
  --font-body:    'Inter', sans-serif;

  /* Spacing */
  --section-py: 6rem;
  --container-max: 1200px;

  /* Transitions */
  --transition: 0.25s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 40px rgba(34, 211, 238, 0.2);
  --shadow-btn: 0 0 20px rgba(34, 211, 238, 0.35);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  margin: 0;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  margin-top: 0;
}

p { margin-top: 0; }

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

a { color: inherit; }

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

.section { padding: var(--section-py) 0; }

.section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--clr-text);
  margin-bottom: 1.25rem;
}

.section-title span { color: var(--clr-primary); }

.section-desc {
  font-size: 1.0625rem;
  color: var(--clr-muted);
  max-width: 560px;
}

.text-center { text-align: center; }
.text-center .section-desc { margin-inline: auto; }

/* ── Scroll-reveal base ───────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s var(--transition-slow), transform 0.65s var(--transition-slow);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Navbar ───────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.site-nav.scrolled {
  background: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 0.75rem 0;
  box-shadow: 0 1px 0 var(--clr-border);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo img {
  height: 52px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-muted);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-text);
  background: rgba(255,255,255,0.06);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px;
}

.nav-cta {
  font-size: 0.875rem !important;
  font-weight: 600 !important;
  color: var(--clr-text) !important;
  background: var(--clr-primary) !important;
  padding: 0.5rem 1.25rem !important;
  border-radius: 8px !important;
  transition: background var(--transition), box-shadow var(--transition) !important;
}

.nav-cta:hover {
  background: var(--clr-primary-h) !important;
  box-shadow: var(--shadow-btn) !important;
}

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

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(13, 17, 23, 0.97);
    backdrop-filter: blur(14px);
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.125rem;
    border-bottom: 1px solid var(--clr-border);
  }

  .nav-links.open { display: flex; }

  .nav-links a { padding: 0.75rem 1rem; font-size: 1rem; }

  .nav-cta { margin-top: 0.5rem; }
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 7rem 0 5rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../img/index_img/Landing_page_bg.jpg');
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,17,23,0.93) 0%, rgba(13,17,23,0.80) 60%, rgba(34,211,238,0.12) 100%);
}

.hero .container { position: relative; z-index: 1; }

.hero-overline {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeInUp 0.7s 0.2s forwards;
}

.hero-overline::before {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--clr-gold);
  border-radius: 2px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6vw, 5rem);
  font-weight: 800;
  color: var(--clr-text);
  line-height: 1.1;
  margin-bottom: 1.75rem;
  max-width: 800px;
  opacity: 0;
  animation: fadeInUp 0.7s 0.4s forwards;
}

.hero-title .accent { color: var(--clr-primary); }

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--clr-muted);
  max-width: 520px;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeInUp 0.7s 0.6s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  opacity: 0;
  animation: fadeInUp 0.7s 0.8s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  opacity: 0;
  animation: fadeInUp 0.7s 1.1s forwards;
  z-index: 1;
}

.hero-scroll span {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-muted-2);
}

.hero-scroll svg {
  animation: bounceDown 1.6s 1.5s ease-in-out infinite;
  color: var(--clr-muted-2);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 10px;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--clr-primary);
  color: #fff;
  border-color: var(--clr-primary);
}

.btn-primary:hover {
  background: var(--clr-primary-h);
  border-color: var(--clr-primary-h);
  box-shadow: var(--shadow-btn);
  transform: translateY(-1px);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--clr-text);
  border-color: var(--clr-border);
}

.btn-outline:hover {
  border-color: var(--clr-muted);
  color: var(--clr-text);
  transform: translateY(-1px);
}

/* ── About Section ────────────────────────────────────────── */
.about-section {
  position: relative;
  overflow: hidden;
}

.about-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('../img/index_img/ou_origin_bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.08;
  z-index: 0;
}

.about-section .container { position: relative; z-index: 1; }

.about-origin {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
  margin-bottom: 5rem;
}

.about-accent-number {
  font-family: var(--font-display);
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--clr-primary), transparent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  user-select: none;
  opacity: 0.6;
}

.about-origin-text .section-desc { max-width: 640px; font-size: 1.125rem; }

.mv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.mv-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-top: 3px solid var(--clr-primary);
  border-radius: 12px;
  padding: 2rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.mv-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.mv-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 0.75rem;
}

.mv-card p {
  color: var(--clr-muted);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .about-origin { grid-template-columns: 1fr; gap: 2rem; }
  .about-accent-number { font-size: 6rem; }
  .mv-grid { grid-template-columns: 1fr; }
}

/* ── Approach Section ─────────────────────────────────────── */
.approach-section { background: var(--clr-bg-alt); }

.approach-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 3rem;
}

.approach-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.approach-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--clr-primary);
}

.approach-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 160px;
  padding: 1.5rem;
  background: var(--clr-surface-2);
  color: var(--clr-primary);
}

.approach-card-icon svg {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}

.approach-card-body {
  padding: 1.5rem;
}

.approach-card-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 0.75rem;
}

.approach-card-desc {
  font-size: 0.9rem;
  color: var(--clr-muted);
  line-height: 1.65;
  margin-bottom: 0;
}

@media (max-width: 1024px) {
  .approach-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .approach-grid { grid-template-columns: 1fr; }
}

/* ── Services Section ─────────────────────────────────────── */
.services-section { background: var(--clr-bg); }

.services-list {
  display: flex;
  flex-direction: column;
  gap: 6rem;
  margin-top: 3rem;
}

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

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

.service-img {
  width: 100%;
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), filter var(--transition-slow);
  filter: grayscale(1) contrast(1.05);
}

.service-row:hover .service-img,
.service-img:hover {
  filter: grayscale(0) contrast(1);
  transform: scale(1.02);
  box-shadow: var(--shadow-card-hover);
}

.service-number {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: 0.75rem;
}

.service-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--clr-text);
  margin-bottom: 1rem;
}

.service-desc {
  color: var(--clr-muted);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .service-row, .service-row.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 2rem;
  }
}

/* ── Partners Section ─────────────────────────────────────── */
.partners-section { background: var(--clr-bg-alt); }

.partners-inner {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 16px;
  padding: 3rem 2.5rem;
  margin-top: 3rem;
}

.partners-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4rem;
  flex-wrap: wrap;
}

.partner-logo {
  max-height: 52px;
  width: auto;
  filter: grayscale(100%) brightness(0.7);
  transition: filter var(--transition), transform var(--transition);
}

.partner-logo:hover {
  filter: grayscale(0%) brightness(1);
  transform: scale(1.06);
}

/* ── Contact Section ──────────────────────────────────────── */
.contact-section { background: var(--clr-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  margin-top: 3rem;
  align-items: start;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.contact-info h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
  color: var(--clr-muted);
}

.contact-detail svg {
  flex-shrink: 0;
  color: var(--clr-primary);
  margin-top: 2px;
}

.contact-detail strong { color: var(--clr-text); display: block; margin-bottom: 0.1rem; }

.contact-social {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.social-btn:hover {
  background: var(--clr-surface);
  border-color: var(--clr-primary);
  transform: translateY(-2px);
  color: var(--clr-text);
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 16px;
  padding: 2.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

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

.form-field label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--clr-muted);
  letter-spacing: 0.03em;
}

.form-field input,
.form-field textarea {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: 8px;
  color: var(--clr-text);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--clr-muted-2);
}

.form-field textarea { resize: vertical; min-height: 130px; }

.form-field-full { grid-column: 1 / -1; }

.form-submit {
  margin-top: 1.25rem;
}

.btn-gold {
  background: var(--clr-gold);
  color: #0a0f1e;
  border-color: var(--clr-gold);
  font-weight: 700;
}

.btn-gold:hover {
  background: var(--clr-gold-h);
  border-color: var(--clr-gold-h);
  color: #0a0f1e;
  transform: translateY(-1px);
}

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

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  background: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-primary);
  padding: 3.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand img {
  height: 44px;
  margin-bottom: 1.25rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--clr-muted);
  max-width: 280px;
  line-height: 1.65;
  margin-bottom: 0;
}

.footer-address {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--clr-muted-2);
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col ul a {
  font-size: 0.9rem;
  color: var(--clr-muted-2);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-col ul a:hover { color: var(--clr-text); }

.footer-bottom {
  border-top: 1px solid var(--clr-border);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--clr-muted-2);
}

.footer-bottom a {
  color: var(--clr-muted-2);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-bottom a:hover { color: var(--clr-text); }

.footer-social {
  display: flex;
  gap: 0.5rem;
}

.footer-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  color: var(--clr-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.footer-social-link:hover {
  background: var(--clr-primary);
  color: #fff;
  border-color: var(--clr-primary);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ── Keyframes ────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bounceDown {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(6px); }
}

/* ── Divider accent ───────────────────────────────────────── */
.section-divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-gold));
  border-radius: 2px;
  margin-bottom: 1.5rem;
}

.text-center .section-divider { margin-inline: auto; }