/* ========================================
   AHOP Systems - Premium Design House Style
   Complete Redesign - Bold, Sophisticated, Spacious
   ======================================== */

/* Import Pretendard Font */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

/* ========================================
   CSS Variables
   ======================================== */
:root {
  /* Colors - Minimal Palette */
  --color-primary: #1F6F78;
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-900: #171717;
  
  /* Spacing */
  --space-unit: 8px;
  --space-xs: calc(var(--space-unit) * 2);    /* 16px */
  --space-sm: calc(var(--space-unit) * 3);    /* 24px */
  --space-md: calc(var(--space-unit) * 4);    /* 32px */
  --space-lg: calc(var(--space-unit) * 6);    /* 48px */
  --space-xl: calc(var(--space-unit) * 8);    /* 64px */
  --space-2xl: calc(var(--space-unit) * 12);  /* 96px */
  --space-3xl: calc(var(--space-unit) * 16);  /* 128px */
  
  /* Typography */
  --font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-size-base: 18px;
  --line-height-base: 1.7;
  
  /* Transitions */
  --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--color-black);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography - Bold & Large
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-black);
  margin: 0 0 var(--space-md) 0;
}

/* Hero Title */
h1 {
  font-size: clamp(3rem, 8vw, 6rem);        /* 48px ~ 96px */
  font-weight: 700;
  letter-spacing: -0.04em;
}

/* Section Titles */
h2 {
  font-size: clamp(2.5rem, 6vw, 4rem);      /* 40px ~ 64px */
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* Card Titles */
h3 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);    /* 24px ~ 40px */
  font-weight: 600;
  letter-spacing: -0.02em;
}

h4 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);  /* 20px ~ 28px */
  font-weight: 600;
}

/* Body Text */
p {
  font-size: 1.125rem;                       /* 18px */
  line-height: 1.8;
  color: var(--color-gray-600);
  margin: 0 0 var(--space-md) 0;
}

/* Large Text */
.text-large {
  font-size: 1.5rem;                         /* 24px */
  line-height: 1.6;
}

/* Small Text */
.text-small {
  font-size: 1rem;                           /* 16px */
  line-height: 1.6;
}

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

a:hover {
  opacity: 0.7;
}

/* ========================================
   Layout System
   ======================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: 960px;
}

.container-wide {
  max-width: 1440px;
}

/* Section Spacing */
.section {
  padding: var(--space-3xl) 0;              /* 128px top/bottom */
}

.section-sm {
  padding: var(--space-2xl) 0;              /* 96px */
}

.section-lg {
  padding: calc(var(--space-3xl) * 1.5) 0; /* 192px */
}

/* Background Colors */
.bg-white {
  background: var(--color-white);
}

.bg-gray {
  background: var(--color-gray-50);
}

.bg-black {
  background: var(--color-black);
  color: var(--color-white);
}

.bg-black h1,
.bg-black h2,
.bg-black h3,
.bg-black h4 {
  color: var(--color-white);
}

.bg-black p {
  color: var(--color-gray-300);
}

/* ========================================
   Grid System
   ======================================== */
.grid {
  display: grid;
  gap: var(--space-xl);
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

@media (max-width: 1024px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid,
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ========================================
   Button System
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.btn-primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  opacity: 1;
}

.btn-secondary {
  background: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}

.btn-secondary:hover {
  background: var(--color-black);
  color: var(--color-white);
  transform: translateY(-2px);
  opacity: 1;
}

.btn-large {
  padding: var(--space-md) var(--space-2xl);
  font-size: 1.125rem;
}

/* ========================================
   Card System
   ======================================== */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 8px;
  padding: var(--space-xl);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.card-minimal {
  border: none;
  padding: var(--space-lg);
}

.card-minimal:hover {
  transform: translateY(-2px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-3xl) 0;
}

.hero h1 {
  margin-bottom: var(--space-lg);
}

.hero p {
  font-size: 1.5rem;
  color: var(--color-gray-500);
  max-width: 720px;
  margin: 0 auto var(--space-2xl) auto;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: 1.25rem;
  color: var(--color-gray-500);
  max-width: 640px;
  margin: 0 auto;
}

/* ========================================
   Icon System
   ======================================== */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: var(--transition);
}

.icon-xl {
  font-size: 5rem;                           /* 80px */
}

.icon-lg {
  font-size: 3rem;                           /* 48px */
}

.icon-md {
  font-size: 2rem;                           /* 32px */
}

.icon:hover {
  transform: scale(1.05);
}

/* ========================================
   Service Items
   ======================================== */
.service-grid {
  display: grid;
  gap: var(--space-3xl);
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.service-item:nth-child(even) .service-icon {
  order: 2;
}

.service-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.service-accent {
  width: 64px;
  height: 4px;
  background: var(--color-primary);
}

.service-icon {
  text-align: center;
}

.service-icon i {
  font-size: 8rem;                           /* 128px */
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .service-item {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .service-item:nth-child(even) .service-icon {
    order: 1;
  }
  
  .service-icon i {
    font-size: 5rem;                         /* 80px */
  }
}

/* ========================================
   Stats/Metrics
   ======================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.stat-value {
  font-size: 4rem;                           /* 64px */
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-black);
}

@media (max-width: 768px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-value {
    font-size: 3rem;                         /* 48px */
  }
}

/* ========================================
   Process Timeline
   ======================================== */
.process-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: 960px;
  margin: 0 auto;
}

.process-item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.process-number {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
}

.process-content h3 {
  margin-bottom: var(--space-xs);
}

.process-content p {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  margin: 0;
}

/* ========================================
   Portfolio Grid
   ======================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.portfolio-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.portfolio-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
}

.portfolio-item h3 {
  margin: 0;
}

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

/* ========================================
   Utilities
   ======================================== */
.text-center {
  text-align: center;
}

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

.mt-xl {
  margin-top: var(--space-xl);
}

.mb-xl {
  margin-bottom: var(--space-xl);
}

/* ========================================
   Scroll Progress
   ======================================== */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--color-primary);
  z-index: 9999;
  transition: width 0.1s ease;
}

/* ========================================
   Mobile Menu
   ======================================== */
#mobile-menu {
  display: none;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

#mobile-menu.show {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Active Navigation Highlighting
   ======================================== */
/* Desktop active menu */
#nav-menu a.active,
#nav-menu a[class*="!text-[#1F6F78]"] {
  color: #1F6F78 !important;
  font-weight: 600 !important;
}

#nav-menu a.active span,
#nav-menu a[class*="!w-full"] span {
  width: 100% !important;
}

/* Mobile active menu */
#mobile-menu a.active,
#mobile-menu a[class*="!text-[#1F6F78]"] {
  color: #1F6F78 !important;
  font-weight: 600 !important;
  border-left: 4px solid #1F6F78;
  padding-left: 1rem !important;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Animation Classes */
.animate-fade-in-up {
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-slide-in-right {
  animation: slideInRight 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-scale-in {
  animation: scaleIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-spin {
  animation: spin 1s linear infinite;
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Fade In on Scroll */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Loading Spinner */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.6s linear infinite;
}

/* ========================================
   Scroll to Top Button
   ======================================== */
#scroll-to-top {
  transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

#scroll-to-top:hover {
  transform: translateY(-4px);
}

#scroll-to-top:active {
  transform: translateY(-2px);
}

/* Pulse animation on hover */
#scroll-to-top:hover::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 50%;
  border: 2px solid #1F6F78;
  animation: pulse-ring 1.5s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  :root {
    --font-size-base: 16px;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .section {
    padding: var(--space-2xl) 0;           /* 96px on mobile */
  }
  
  .hero {
    min-height: 70vh;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
}