/* ==========================================================================
   CSS Variables & Tokens (Light Platinum Theme)
   ========================================================================== */
:root {
  /* Fonts */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro", "SF Pro Display", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Colors - Light Premium Theme */
  --color-bg: #f5f5f7; /* Apple silver gray background */
  --color-surface: rgba(255, 255, 255, 0.65);
  --color-surface-solid: #ffffff;
  --color-surface-hover: rgba(255, 255, 255, 0.95);
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-focus: rgba(0, 0, 0, 0.18);
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #515154;
  --color-text-muted: #86868b;
  
  /* Accents */
  --color-accent: #e4602a;
  --color-accent-hover: #c34b1c;
  --color-accent-subtle: rgba(228, 96, 42, 0.1);
  --gradient-brand: linear-gradient(135deg, #e4602a 0%, #ff8c42 100%);
  --gradient-text: linear-gradient(180deg, #1d1d1f 0%, #434346 100%);
  
  /* Shadows */
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);

  /* Dimensions & Spacing */
  --header-height: 64px;
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  /* Transitions */
  --transition-spring: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  position: relative;
  background-image: radial-gradient(circle at 50% 0%, #ffffff 0%, transparent 60%);
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

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

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

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

.section-padding {
  padding: 80px 24px;
}

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

.section-head {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}

.section-kicker {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 24px;
}

.section-desc {
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Loader
   ========================================================================== */
.site-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.site-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.loader-logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-text-primary);
  animation: pulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

.loader-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ==========================================================================
   Header & Nav - Light Glassmorphism
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background-color var(--transition-smooth), border-bottom var(--transition-smooth), box-shadow var(--transition-smooth);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-text-primary);
}

.brand__name {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  display: none;
}

@media (min-width: 768px) {
  .brand__name { display: block; }
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: 1001;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
}

.hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  margin: 0 auto;
  position: relative;
  transition: background var(--transition-smooth);
}

.hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--color-text-primary);
  left: 0;
  transition: transform var(--transition-spring);
}

.hamburger::before { transform: translateY(-6px); }
.hamburger::after { transform: translateY(6px); }

.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { transform: rotate(-45deg); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.site-nav a:hover {
  color: var(--color-text-primary);
}

.btn-primary-small {
  padding: 8px 16px;
  background: var(--color-text-primary);
  color: var(--color-surface-solid) !important;
  border-radius: 999px;
  font-weight: 600 !important;
  transition: transform var(--transition-spring), filter var(--transition-smooth), box-shadow var(--transition-smooth);
}
.btn-primary-small:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-smooth);
    z-index: 1000;
  }
  
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .site-nav a {
    font-size: 1.5rem;
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 56px;
  padding: 0 32px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-spring);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 15px rgba(228, 96, 42, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--color-accent-hover);
  box-shadow: 0 8px 25px rgba(228, 96, 42, 0.4);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--color-surface-solid);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 120px 24px 64px;
  gap: 40px;
  max-width: var(--container-width);
  margin: 0 auto;
}

@media (max-width: 992px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 160px;
  }
  .hero-actions { justify-content: center; }
}

.hero-content {
  z-index: 2;
}

.hero-eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.hero-headline {
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  line-height: 1.15;
  color: var(--color-text-primary);
}

.hero-lead {
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 48px;
  max-width: 600px;
}

@media (max-width: 992px) {
  .hero-lead { margin-left: auto; margin-right: auto; }
}

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

.hero-visual {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: perspective(1000px) rotateY(-5deg);
  transition: transform var(--transition-spring);
}

.hero-visual:hover {
  transform: perspective(1000px) rotateY(0deg) translateY(-10px);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* ==========================================================================
   Services Grid
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.glass-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: background var(--transition-smooth), transform var(--transition-spring), box-shadow var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.glass-card:hover {
  background: var(--color-surface-solid);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--color-accent-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 32px;
  color: var(--color-accent);
}

.card-icon svg {
  width: 32px;
  height: 32px;
}

.card-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: 12px;
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.card-text {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-tags span {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  font-weight: 500;
}

/* Optional Card Image */
.card-image-wrap {
  margin: -40px -40px 32px -40px;
  height: 200px;
  overflow: hidden;
}
.card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.glass-card:hover .card-image-wrap img {
  transform: scale(1.05);
}

/* ==========================================================================
   Method Timeline
   ========================================================================== */
.method-timeline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

@media (max-width: 768px) {
  .method-timeline { grid-template-columns: 1fr; }
}

.method-step {
  display: flex;
  gap: 24px;
}

.step-marker {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--color-surface-solid);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.step-keywords {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* ==========================================================================
   Industries Bento Grid
   ========================================================================== */
.industry-bento {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: auto auto;
  gap: 24px;
}

@media (max-width: 768px) {
  .industry-bento { grid-template-columns: 1fr; }
}

.bento-box {
  padding: 40px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
}

.bento-large {
  grid-row: span 2;
  min-height: 400px;
}

.bento-wide {
  grid-column: span 2;
  min-height: 400px;
}

@media (max-width: 768px) {
  .bento-large { grid-row: auto; }
  .bento-wide { grid-column: span 1; min-height: 300px; }
}

.bento-content {
  position: relative;
  z-index: 2;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.bento-box h3 {
  font-size: 1.25rem;
  margin: 12px 0 8px;
  line-height: 1.4;
}

.bento-box p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.bento-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  transition: transform var(--transition-spring);
}
.bento-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bento-box:hover .bento-bg {
  transform: scale(1.05);
}

/* ==========================================================================
   Contact Forms
   ========================================================================== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

@media (max-width: 992px) {
  .contact-layout { grid-template-columns: 1fr; }
}

.principle-list {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.principle {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 1.125rem;
  font-weight: 500;
}

.check-icon {
  width: 24px; height: 24px;
  background: var(--color-accent);
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}
.check-icon::after {
  content: '';
  position: absolute;
  width: 6px; height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  top: 5px; left: 9px;
  transform: rotate(45deg);
}

.contact-form-wrapper {
  padding: 48px;
  background: var(--color-surface-solid);
}

.form-title {
  margin-bottom: 32px;
  font-size: 1.5rem;
}

.form-row {
  margin-bottom: 24px;
}

.form-row.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 480px) {
  .form-row.split { grid-template-columns: 1fr; }
}

.input-group {
  position: relative;
}

.input-group input, 
.input-group select, 
.input-group textarea {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  color: var(--color-text-primary);
  transition: all var(--transition-smooth);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
  outline: none;
  background: var(--color-surface-solid);
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-sm);
}

.input-group label {
  position: absolute;
  left: 16px;
  top: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
  transition: all 0.2s ease;
  transform-origin: 0 0;
}

.input-group input:focus ~ label,
.input-group input.has-value ~ label,
.input-group textarea:focus ~ label,
.input-group textarea.has-value ~ label,
.input-group select:focus ~ label,
.input-group select.has-value ~ label {
  transform: translateY(-28px) scale(0.85);
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Custom Select styling */
.select-wrapper::after {
  content: url('data:image/svg+xml;utf8,<svg width="12" height="12" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6 9L12 15L18 9" stroke="%2386868b" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}
.input-group select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 40px;
}
.input-group select:invalid {
  color: transparent;
}
.input-group select.has-value {
  color: var(--color-text-primary);
}

.textarea-counter {
  text-align: right;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 8px;
}

.form-actions {
  margin-top: 32px;
}

.form-alert {
  margin-top: 16px;
  padding: 12px;
  background: rgba(228, 96, 42, 0.1);
  border: 1px solid rgba(228, 96, 42, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 0.875rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 64px 24px 32px;
  background: var(--color-bg);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand strong {
  display: block;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.footer-brand span {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--color-text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

@media (max-width: 768px) {
  .footer-bottom { flex-direction: column; gap: 16px; align-items: flex-start; }
}

/* ==========================================================================
   Scroll Reveal Animations
   ========================================================================== */
.reveal-item {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 1s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.15s; }
.reveal-delay-3 { transition-delay: 0.2s; }