/* STC Inc. - Ultra Light CSS */
:root{--gold:#C5A059;--dark:#1A1A1A;--light:#F8F8F8;--gray:#666}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Hiragino Sans',sans-serif;background:var(--light);color:var(--dark);line-height:1.6;overflow-x:hidden}
::selection{background:var(--gold);color:#fff}
a{text-decoration:none;color:inherit}
button{background:none;border:none;cursor:pointer;font:inherit}
img{max-width:100%;height:auto;display:block}
details>summary{list-style:none;cursor:pointer}
details>summary::-webkit-details-marker{display:none}

/* Nav */
.nav{position:fixed;top:0;width:100%;z-index:40;padding:1rem;display:flex;justify-content:space-between;align-items:center}
.nav-logo{font-size:1.125rem;font-weight:700;letter-spacing:-0.05em}
.menu-btn{display:flex;align-items:center;gap:0.5rem}
.menu-btn span{font-size:0.7rem;text-transform:uppercase;letter-spacing:0.15em;font-weight:500}
.menu-btn-icon{width:1.75rem;height:1.75rem;display:flex;align-items:center;justify-content:center;border:1px solid rgba(26,26,26,0.2);border-radius:50%;background:rgba(255,255,255,0.5)}

/* Menu */
#menu-overlay{position:fixed;inset:0;background:var(--dark);z-index:30;display:none;opacity:0;transition:opacity 0.3s}
#menu-overlay.visible{display:flex;opacity:1}
.menu-links{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:1.5rem}
.menu-links a{font-size:1.5rem;font-weight:700;color:#fff;transition:color 0.3s}
.menu-links a:hover{color:var(--gold)}

/* Grid */
.grid-lines{position:fixed;inset:0;pointer-events:none;z-index:0;display:flex;justify-content:space-between;padding:0 10%;opacity:0.1}
.grid-lines div{width:1px;height:100%;background:var(--dark)}

/* Hero */
.hero{position:relative;width:100%;height:100vh;min-height:500px;display:flex;flex-direction:column;justify-content:center;align-items:center;overflow:hidden}
.hero-slideshow{position:absolute;inset:0;width:100%;height:100%}
.hero-slide{position:absolute;inset:0;width:100%;height:100%;background-size:cover;background-position:center;filter:grayscale(0.8);opacity:0;transition:opacity 1.5s ease-in-out}
.hero-slide.active{opacity:1}
.hero-overlay{position:absolute;inset:0;background:rgba(255,255,255,0.35);z-index:1}
.hero-content{position:relative;z-index:10;text-align:center;padding:0 1rem}
.hero-title{font-size:16vw;line-height:0.85;font-weight:700;letter-spacing:-0.05em;text-transform:uppercase}
.hero-subtitle{margin-top:0.75rem;font-size:0.65rem;font-weight:500;letter-spacing:0.2em;text-transform:uppercase;animation:fadeIn 0.8s ease 0.5s forwards;opacity:0}
.hero-vertical{position:absolute;bottom:2rem;right:1rem;writing-mode:vertical-rl;font-size:0.65rem;font-weight:500;letter-spacing:0.15em;height:10rem;border-right:1px solid var(--dark);padding-right:0.75rem;display:flex;align-items:flex-end;animation:fadeIn 1s ease 1s forwards;opacity:0;z-index:10}
.scroll-indicator{position:absolute;bottom:2rem;left:1rem;display:flex;flex-direction:column;align-items:center;gap:0.4rem;z-index:10}
.scroll-indicator-line{width:1px;height:3rem;background:rgba(26,26,26,0.3);position:relative;overflow:hidden}
.scroll-indicator-line::after{content:'';position:absolute;top:0;left:0;width:100%;height:50%;background:var(--dark);animation:scrollAnim 2s ease-in-out infinite}
.scroll-indicator span{font-size:9px;letter-spacing:0.1em;text-transform:uppercase}
.hero-indicators{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);display:flex;gap:0.5rem;z-index:10}
.indicator{width:1.5rem;height:2px;background:rgba(26,26,26,0.3);border:none;cursor:pointer;transition:background 0.3s,width 0.3s}
.indicator.active{background:var(--dark);width:2rem}

/* Section */
.section-label{display:block;color:var(--gold);font-size:0.65rem;font-weight:700;letter-spacing:0.15em;margin-bottom:0.75rem}
.highlight{background:rgba(197,160,89,0.1);padding:0 0.25rem}
.text-gold{color:var(--gold)}

/* Mission */
.mission-section{padding:4rem 1rem;background:var(--light)}
.mission-container{max-width:80rem;margin:0 auto}
.mission-grid{display:grid;grid-template-columns:1fr;gap:2rem}
.mission-left{margin-bottom:1rem}
.mission-title{font-size:1.75rem;font-weight:700;line-height:1.3;letter-spacing:-0.025em}
.mission-right{}
.mission-lead{font-size:1rem;line-height:1.8;font-weight:500;color:#333;margin-bottom:2rem}
.mission-features{display:grid;grid-template-columns:1fr;gap:1.5rem;padding-top:2rem;border-top:1px solid #e5e7eb}
.mission-feature{}
.mission-feature-title{font-size:1rem;font-weight:700;margin-bottom:0.75rem;display:flex;gap:0.5rem;align-items:center}
.mission-feature-text{font-size:0.8rem;color:#666;line-height:1.8}

/* Services */
.services-section{position:relative;width:100%;height:300vh;background:var(--dark);color:#fff}
.services-sticky{position:sticky;top:0;width:100%;height:100vh;overflow:hidden;display:flex;align-items:center}
.services-header{position:absolute;top:1.5rem;left:1rem;z-index:20}
.services-header h2{font-size:1.25rem;font-weight:700}
.services-track{display:flex;gap:1rem;padding-left:1rem;padding-right:5rem;align-items:flex-start;height:auto;padding-top:5rem;padding-bottom:3rem;width:max-content;will-change:transform}
.service-card{position:relative;width:75vw;flex-shrink:0}
.service-card-num{position:absolute;top:-1.5rem;left:-0.5rem;font-size:8vh;font-weight:700;color:rgba(255,255,255,0.05);z-index:0;user-select:none}
.service-card-inner{position:relative;z-index:10;display:flex;flex-direction:column;background:#2A2A2A;padding:1rem;border:1px solid rgba(255,255,255,0.1)}
.service-card-img{position:relative;width:100%;height:140px;overflow:hidden;flex-shrink:0}
.service-card-img img{width:100%;height:100%;object-fit:cover;filter:grayscale(1);transition:filter 0.5s}
.service-card:hover .service-card-img img{filter:grayscale(0)}
.service-card-content{display:flex;flex-direction:column;justify-content:flex-start;gap:0.5rem;padding-top:1rem}
.service-card-content h3{font-size:1.25rem;font-weight:700;letter-spacing:-0.025em;margin-bottom:0.25rem}
.service-card-content h4{font-size:0.9rem;color:#C5A059;font-weight:500}
.service-card-content p{color:#9ca3af;line-height:1.6;font-size:0.75rem}
.service-card-divider{height:1px;width:2rem;background:rgba(255,255,255,0.2)}
.service-tags{display:flex;flex-wrap:wrap;gap:0.4rem;padding-top:0.75rem}
.service-tag{font-size:0.6rem;border:1px solid rgba(255,255,255,0.2);padding:0.1rem 0.35rem;color:#9ca3af}
.services-progress-wrap{position:absolute;bottom:1.5rem;left:1rem;right:1rem;height:1px;background:rgba(255,255,255,0.1)}
.services-progress{height:100%;background:var(--gold);width:0}

/* Cases */
.cases-section{padding:4rem 1rem;background:var(--light)}
.cases-container{max-width:80rem;margin:0 auto}
.cases-header{margin-bottom:2rem}
.cases-header h2{font-size:1.5rem;font-weight:700;margin-top:0.5rem}
.cases-desc{font-size:0.75rem;color:#6b7280;margin-top:1rem;line-height:1.6}
.cases-grid{display:grid;grid-template-columns:1fr;gap:2rem}
.case-card{cursor:pointer}
.case-card-img{aspect-ratio:4/3;overflow:hidden;margin-bottom:1rem;position:relative}
.case-card-img::after{content:'';position:absolute;inset:0;background:rgba(26,26,26,0);transition:background 0.5s}
.case-card:hover .case-card-img::after{background:rgba(26,26,26,0.2)}
.case-card-img img{width:100%;height:100%;object-fit:cover;filter:grayscale(1);transition:transform 0.5s,filter 0.5s}
.case-card:hover .case-card-img img{transform:scale(1.05);filter:grayscale(0)}
.case-card-meta{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:0.5rem}
.case-card-meta span{font-size:0.65rem}
.case-card h3{font-size:1rem;font-weight:700;margin-bottom:0.5rem}
.case-card-result{font-size:0.75rem;color:var(--gray);line-height:1.5}

/* Flow */
.flow-section{padding:4rem 1rem;background:#fff}
.flow-container{max-width:56rem;margin:0 auto}
.flow-header{text-align:center;margin-bottom:3rem}
.flow-header h2{font-size:1.5rem;font-weight:700;margin-bottom:1rem}
.flow-header p{color:#666;line-height:1.6;font-size:0.8rem}
.flow-step{display:flex;flex-direction:column;padding:1.25rem 1rem;border-bottom:1px solid rgba(26,26,26,0.1);gap:0.25rem;transition:background 0.3s}
.flow-step:hover{background:var(--light)}
.flow-step-num{font-weight:700;color:#C5A059;font-size:1rem}
.flow-step-title{font-weight:700;font-size:1rem}
.flow-step-desc{font-size:0.8rem;color:#666}

/* FAQ */
.faq-section{margin-top:4rem}
.faq-section h3{font-size:1.125rem;font-weight:700;margin-bottom:2rem;text-align:center}
.faq-item{border:1px solid rgba(26,26,26,0.1);padding:1.25rem;margin-bottom:0.75rem}
.faq-item[open]{background:var(--light)}
.faq-item summary{display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:0.8rem;gap:1rem}
.faq-item summary svg{flex-shrink:0;transition:transform 0.3s}
.faq-item[open] summary svg{transform:rotate(180deg)}
.faq-answer{margin-top:1rem;font-size:0.8rem;color:var(--gray);line-height:1.75;padding-left:1rem;border-left:2px solid var(--gold)}

/* Contact Form */
.contact-section{padding:4rem 1rem;background:var(--light)}
.contact-container{max-width:48rem;margin:0 auto}
.contact-header{text-align:center;margin-bottom:2rem}
.contact-title{font-size:1.5rem;font-weight:700;margin-bottom:1rem}
.contact-lead{color:#666;line-height:1.8;font-size:0.85rem}
.contact-form{background:#fff;padding:1.5rem;border:1px solid #e5e7eb}
.form-group{margin-bottom:1.25rem}
.form-row{display:grid;grid-template-columns:1fr;gap:1.25rem}
.form-label{display:block;font-size:0.8rem;font-weight:600;margin-bottom:0.4rem;color:var(--dark)}
.required{color:#dc2626;margin-left:0.25rem}
.form-input,.form-select,.form-textarea{width:100%;padding:0.75rem;font-size:0.85rem;border:1px solid #d1d5db;background:#fff;color:var(--dark);transition:border-color 0.2s,box-shadow 0.2s;border-radius:0}
.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(197,160,89,0.1)}
.form-input::placeholder,.form-textarea::placeholder{color:#9ca3af}
.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 0.75rem center;background-size:1rem}
.form-textarea{resize:vertical;min-height:100px}
.form-privacy{margin:1.5rem 0}
.checkbox-label{display:flex;align-items:flex-start;gap:0.5rem;cursor:pointer;font-size:0.8rem}
.checkbox-label input[type="checkbox"]{width:1.125rem;height:1.125rem;cursor:pointer;accent-color:var(--gold);flex-shrink:0;margin-top:0.1rem}
.checkbox-text a{color:var(--gold);text-decoration:underline}
.checkbox-text a:hover{color:var(--dark)}
.form-submit{text-align:center}
.submit-btn{display:inline-flex;align-items:center;gap:0.5rem;background:var(--dark);color:#fff;border:2px solid var(--dark);padding:0.875rem 2rem;font-size:0.8rem;font-weight:700;letter-spacing:0.05em;cursor:pointer;transition:all 0.3s}
.submit-btn:hover{background:transparent;color:var(--dark)}
.submit-btn:disabled{opacity:0.5;cursor:not-allowed}
.form-message{margin-top:1rem;padding:0.875rem;text-align:center;font-size:0.8rem;display:none}
.form-message.success{display:block;background:#d1fae5;color:#065f46;border:1px solid #6ee7b7}
.form-message.error{display:block;background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}

/* Footer */
.footer{background:var(--dark);color:#fff;padding:3rem 1rem 1.5rem}
.footer-grid{display:grid;grid-template-columns:1fr;gap:2rem;max-width:80rem;margin:0 auto;padding-bottom:2rem;border-bottom:1px solid rgba(255,255,255,0.1)}
.footer-title{font-size:1.25rem;font-weight:700;letter-spacing:-0.025em;margin-bottom:1rem}
.footer-company{margin-top:0}
.footer-company-header{margin-bottom:1.5rem}
.footer-company-name{font-size:1.125rem;font-weight:700;margin-top:0.25rem}
.footer-info{display:grid;grid-template-columns:1fr;gap:1rem}
.footer-info-item{}
.footer-info-label{font-size:0.65rem;color:#6b7280;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:0.25rem}
.footer-info-text{font-size:0.8rem;color:#e5e7eb;line-height:1.5}
.footer-info-text a{color:#e5e7eb;transition:color 0.3s}
.footer-info-text a:hover{color:var(--gold)}
.footer-bottom{max-width:80rem;margin:0 auto;padding-top:1.5rem;display:flex;flex-direction:column;gap:0.75rem;align-items:center;font-size:0.65rem;color:var(--gray);text-align:center}
.footer-links{display:flex;gap:1.5rem}
.footer-links a:hover{color:#fff}

/* Button */
.btn{display:inline-flex;align-items:center;gap:0.5rem;border:1px solid var(--dark);padding:0.875rem 1.5rem;font-size:0.7rem;font-weight:700;letter-spacing:0.1em;transition:background 0.3s,color 0.3s}
.btn:hover{background:var(--dark);color:#fff}

/* Animations */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes scrollAnim{0%{transform:translateY(-100%)}50%{transform:translateY(100%)}100%{transform:translateY(-100%)}}

/* Tablet */
@media(min-width:600px){
  .cases-grid{grid-template-columns:repeat(2,1fr);gap:1.5rem}
  .footer-info{grid-template-columns:1fr 1fr}
}

/* Desktop */
@media(min-width:769px){
  .nav{padding:1.5rem}
  .nav-logo{font-size:1.25rem}
  .menu-btn span{font-size:0.75rem}
  .menu-btn-icon{width:2rem;height:2rem}
  .menu-links a{font-size:1.875rem}
  .menu-links{gap:2rem}
  
  .hero-title{font-size:12vw}
  .hero-subtitle{font-size:0.75rem;letter-spacing:0.3em}
  .hero-vertical{bottom:3rem;right:1.5rem;font-size:0.75rem;height:12rem;padding-right:1rem}
  .scroll-indicator{bottom:3rem;left:1.5rem}
  .scroll-indicator-line{height:4rem}
  .scroll-indicator span{font-size:10px}
  .hero-indicators{bottom:3rem;gap:0.75rem}
  .indicator{width:2rem;height:3px}
  .indicator.active{width:3rem}
  
  .section-label{font-size:0.75rem;letter-spacing:0.2em;margin-bottom:1rem}
  
  .mission-section{padding:10rem 5rem}
  .mission-grid{grid-template-columns:1fr 2fr;gap:5rem}
  .mission-left{margin-bottom:0}
  .mission-title{font-size:3rem}
  .mission-lead{font-size:1.5rem;margin-bottom:4rem}
  .mission-features{grid-template-columns:1fr 1fr;gap:3rem;padding-top:3rem}
  .mission-feature-title{font-size:1.125rem}
  .mission-feature-text{font-size:0.875rem}
  
  .services-section{height:400vh}
  .services-header{top:3rem;left:5rem}
  .services-header h2{font-size:2.25rem}
  .services-track{gap:4rem;padding-left:10vw;padding-right:15vw;padding-top:5rem}
  .service-card{width:50vw}
  .service-card-num{top:-3rem;left:-2rem;font-size:14vh}
  .service-card-inner{flex-direction:row;gap:2rem;padding:2rem}
  .service-card-img{width:45%;height:auto;min-height:280px}
  .service-card-content{padding-top:0;gap:1rem}
  .service-card-content h3{font-size:1.875rem}
  .service-card-content h4{font-size:1.125rem}
  .service-card-content p{font-size:0.875rem}
  .service-tag{font-size:0.7rem;padding:0.2rem 0.5rem}
  .services-progress-wrap{left:5rem;right:5rem;bottom:2.5rem}
  
  .cases-section{padding:8rem 5rem}
  .cases-header h2{font-size:1.875rem}
  .cases-desc{max-width:28rem}
  .cases-grid{grid-template-columns:repeat(3,1fr);gap:2rem}
  .case-card-img{aspect-ratio:4/5}
  .case-card:nth-child(2){margin-top:5rem}
  .case-card h3{font-size:1.25rem}
  .case-card-result{font-size:0.875rem;opacity:0;transform:translateY(0.5rem);transition:opacity 0.3s,transform 0.3s}
  .case-card:hover .case-card-result{opacity:1;transform:translateY(0)}
  
  .flow-section{padding:8rem 5rem}
  .flow-header{margin-bottom:6rem}
  .flow-header h2{font-size:1.875rem;margin-bottom:2rem}
  .flow-header p{max-width:42rem;margin:0 auto}
  .flow-step{flex-direction:row;padding:1.5rem 1rem;gap:2rem}
  .flow-step-num{min-width:3rem}
  .flow-step-title{min-width:12rem}
  .faq-section{margin-top:8rem}
  .faq-section h3{font-size:1.25rem;margin-bottom:3rem}
  .faq-item{padding:1.5rem}
  .faq-item summary{font-size:0.875rem}
  .faq-answer{font-size:0.875rem}
  
  .contact-section{padding:10rem 5rem}
  .contact-title{font-size:2rem}
  .contact-lead{font-size:1rem}
  .contact-form{padding:3rem}
  .form-row{grid-template-columns:1fr 1fr}
  .form-label{font-size:0.875rem}
  .form-input,.form-select,.form-textarea{font-size:0.9rem;padding:0.875rem 1rem}
  
  .footer{padding:6rem 5rem 2rem}
  .footer-grid{grid-template-columns:1fr 1fr;gap:5rem;padding-bottom:3rem}
  .footer-title{font-size:1.875rem}
  .footer-company-name{font-size:1.5rem}
  .footer-info{grid-template-columns:1fr 1fr;gap:1.5rem}
  .footer-info-label{font-size:0.7rem}
  .footer-info-text{font-size:0.875rem}
  .footer-bottom{flex-direction:row;justify-content:space-between;font-size:0.75rem}
  
  .btn{padding:1rem 2rem;font-size:0.75rem}
  .nav span{display:block}
}

@media(max-width:768px){
  .hero-vertical{display:none}
  .nav span{display:none}
}