/* ============================================================
   통신킹 디자인 시스템 v1 (tk-system.css)
   ----------------------------------------------------
   - intro/브로셔 페이지 디자인을 baseline으로 한 글로벌 토큰
   - `.tk-` 접두사 스코프로 기존 페이지에 영향 없음
   - Pretendard + 라이트 톤 + 보라(브랜드) + 오렌지(액션)
   ============================================================ */

:root{
    /* ----- 컬러 토큰 ----- */
    --tk-ink:#0f172a;
    --tk-ink-soft:#1e293b;
    --tk-ink-mute:#334155;
    --tk-muted:#64748b;
    --tk-muted-2:#94a3b8;
    --tk-line:#e6e8ef;
    --tk-line-2:#eef0f6;
    --tk-line-3:#f1f3f9;
    --tk-bg:#ffffff;
    --tk-bg-soft:#f7f8fc;
    --tk-bg-tint:#f0eefe;

    --tk-brand:#5143d9;
    --tk-brand-2:#7c70f0;
    --tk-brand-deep:#3d33b3;
    --tk-brand-soft:#eeebff;
    --tk-brand-tint:#f5f3ff;

    --tk-accent:#ff6b35;
    --tk-accent-2:#ffb547;
    --tk-accent-soft:#fff1eb;

    --tk-good:#10b981;
    --tk-good-soft:#d1fae5;
    --tk-warn:#f59e0b;
    --tk-warn-soft:#fef3c7;
    --tk-danger:#ef4444;
    --tk-danger-soft:#fee2e2;
    --tk-info:#06b6d4;
    --tk-info-soft:#cffafe;

    /* ----- Spacing scale (8 base) ----- */
    --tk-sp-1:.25rem;
    --tk-sp-2:.5rem;
    --tk-sp-3:.75rem;
    --tk-sp-4:1rem;
    --tk-sp-5:1.5rem;
    --tk-sp-6:2rem;
    --tk-sp-7:3rem;
    --tk-sp-8:4rem;
    --tk-sp-9:6rem;

    /* ----- Radius ----- */
    --tk-r-sm:8px;
    --tk-r-md:14px;
    --tk-r-lg:18px;
    --tk-r-xl:24px;
    --tk-r-2xl:32px;
    --tk-r-full:999px;

    /* ----- Shadow ----- */
    --tk-shadow-sm:0 2px 6px rgba(15,23,42,.04), 0 1px 2px rgba(15,23,42,.06);
    --tk-shadow-md:0 10px 24px -8px rgba(15,23,42,.08), 0 4px 10px -4px rgba(15,23,42,.06);
    --tk-shadow-lg:0 30px 60px -24px rgba(81,67,217,.18), 0 10px 24px -10px rgba(15,23,42,.08);
    --tk-shadow-xl:0 40px 80px -28px rgba(81,67,217,.25), 0 14px 30px -14px rgba(15,23,42,.12);

    /* ----- z-index ----- */
    --tk-z-nav:1030;
    --tk-z-overlay:1040;
    --tk-z-fab:1045;
    --tk-z-modal:1050;
    --tk-z-toast:1060;

    /* ----- Typography scale ----- */
    --tk-fs-xs:.8rem;
    --tk-fs-sm:.875rem;
    --tk-fs-base:1rem;
    --tk-fs-md:1.05rem;
    --tk-fs-lg:1.2rem;
    --tk-fs-xl:1.5rem;
    --tk-fs-2xl:2rem;
    --tk-fs-3xl:2.6rem;
    --tk-fs-display:3.4rem;

    /* ----- Transition ----- */
    --tk-tr-fast:.15s ease;
    --tk-tr-base:.2s ease;
    --tk-tr-slow:.3s ease;
}

/* ============================================================
   Root 스코프 (.tk 또는 [data-tk])
   ============================================================ */
.tk{
    font-family:'Pretendard','Pretendard Variable',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    color:var(--tk-ink);
    background:var(--tk-bg);
    letter-spacing:-0.02em;
    line-height:1.5;
    -webkit-tap-highlight-color:rgba(81,67,217,.12);
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    text-rendering:optimizeLegibility;
    -webkit-text-size-adjust:100%;
    overflow-x:clip;
}
.tk *{box-sizing:border-box;}

/* 제목 — base.html 글로벌 h1 padding 강제값 무력화 */
.tk h1,.tk h2,.tk h3,.tk h4{
    color:var(--tk-ink) !important;
    margin:0;
    padding:0 !important;
    font-weight:900;
    line-height:1.2;
    letter-spacing:-0.035em;
}
.tk p{margin:0;color:var(--tk-ink-soft) !important;}
.tk strong{color:var(--tk-ink) !important;font-weight:800;}
.tk a{color:var(--tk-brand);text-decoration:none;}
.tk a:hover{text-decoration:none;color:var(--tk-brand-deep);}

/* ============================================================
   Layout helpers
   ============================================================ */
.tk-container{max-width:1200px;margin:0 auto;padding:0 20px;}
.tk-container-sm{max-width:780px;margin:0 auto;padding:0 20px;}
.tk-container-lg{max-width:1320px;margin:0 auto;padding:0 24px;}

.tk-section{padding:56px 0;}
@media (min-width:768px){
    .tk-section{padding:84px 0;}
}
.tk-section-sm{padding:40px 0;}
@media (min-width:768px){
    .tk-section-sm{padding:60px 0;}
}

.tk-center{text-align:center;}

/* ============================================================
   Common typography
   ============================================================ */
.tk-eyebrow{
    display:inline-block;font-size:.82rem;font-weight:800;
    color:var(--tk-brand) !important;background:var(--tk-brand-soft);
    padding:.4rem .95rem;border-radius:var(--tk-r-full);
    margin-bottom:.9rem;
}
.tk-title{
    font-size:clamp(1.7rem,4vw,2.5rem);font-weight:900;
    color:var(--tk-ink) !important;line-height:1.2;
    letter-spacing:-0.035em;
}
.tk-title-lg{
    font-size:clamp(2rem,5vw,3.2rem);font-weight:900;
    color:var(--tk-ink) !important;line-height:1.16;
    letter-spacing:-0.04em;
}
.tk-title .em,.tk-title-lg .em{color:var(--tk-brand) !important;}
.tk-title .hl,.tk-title-lg .hl{
    background:linear-gradient(120deg,var(--tk-brand),var(--tk-accent));
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;color:transparent !important;
}
.tk-title .ul,.tk-title-lg .ul{position:relative;display:inline-block;color:var(--tk-ink) !important;}
.tk-title .ul::after,.tk-title-lg .ul::after{
    content:"";position:absolute;left:0;right:0;bottom:.04em;height:.32em;
    background:var(--tk-accent-2);opacity:.55;z-index:-1;border-radius:4px;
}
.tk-lead{
    color:var(--tk-muted) !important;font-size:clamp(1rem,1.7vw,1.15rem);
    line-height:1.65;font-weight:500;
}
.tk-lead strong{color:var(--tk-ink) !important;font-weight:800;}

/* ============================================================
   Buttons
   ============================================================ */
.tk-btn{
    display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
    font-weight:800;font-size:1rem;border:0;border-radius:var(--tk-r-full);
    cursor:pointer;text-decoration:none;font-family:inherit;
    padding:.95rem 1.7rem;min-height:50px;white-space:nowrap;
    transition:transform var(--tk-tr-fast), box-shadow var(--tk-tr-fast), background var(--tk-tr-fast), color var(--tk-tr-fast);
}
.tk-btn-primary{
    background:linear-gradient(120deg,var(--tk-brand),var(--tk-brand-2));
    color:#fff !important;
    box-shadow:0 14px 30px -10px rgba(81,67,217,.55);
}
.tk-btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 38px -10px rgba(81,67,217,.7);color:#fff !important;}
.tk-btn-accent{
    background:linear-gradient(120deg,var(--tk-accent),#ff8b4a);
    color:#fff !important;
    box-shadow:0 14px 30px -10px rgba(255,107,53,.5);
}
.tk-btn-accent:hover{transform:translateY(-2px);box-shadow:0 20px 38px -10px rgba(255,107,53,.65);color:#fff !important;}
.tk-btn-outline{
    background:#fff;color:var(--tk-ink) !important;border:1.5px solid var(--tk-line);
}
.tk-btn-outline:hover{border-color:var(--tk-brand);color:var(--tk-brand) !important;}
.tk-btn-ghost{background:transparent;color:var(--tk-brand) !important;}
.tk-btn-ghost:hover{background:var(--tk-brand-soft);color:var(--tk-brand) !important;}
.tk-btn-light{
    background:rgba(255,255,255,.16);color:#fff !important;
    border:1.5px solid rgba(255,255,255,.4);backdrop-filter:blur(8px);
}
.tk-btn-light:hover{background:rgba(255,255,255,.28);color:#fff !important;}
.tk-btn-sm{padding:.65rem 1.2rem;font-size:.92rem;min-height:42px;}
.tk-btn-lg{padding:1.15rem 2rem;font-size:1.1rem;min-height:58px;}
.tk-btn-block{width:100%;}

/* ============================================================
   Cards
   ============================================================ */
.tk-card{
    background:#fff;border:1px solid var(--tk-line);border-radius:var(--tk-r-lg);
    padding:1.6rem;
    transition:transform var(--tk-tr-base), box-shadow var(--tk-tr-base);
}
.tk-card-lg{
    background:#fff;border:1px solid var(--tk-line);border-radius:var(--tk-r-xl);
    padding:2rem;
}
.tk-card-hover:hover{transform:translateY(-4px);box-shadow:var(--tk-shadow-md);}
.tk-card-glow:hover{transform:translateY(-5px);box-shadow:0 24px 48px -22px rgba(81,67,217,.25);border-color:var(--tk-brand-2);}

/* ============================================================
   Chips / Tags
   ============================================================ */
.tk-chip{
    display:inline-flex;align-items:center;gap:.4rem;
    font-size:.85rem;font-weight:700;
    background:var(--tk-bg-soft);color:var(--tk-ink-soft);
    border:1px solid var(--tk-line);border-radius:var(--tk-r-full);
    padding:.35rem .9rem;
}
.tk-chip-brand{background:var(--tk-brand-soft);color:var(--tk-brand) !important;border-color:transparent;}
.tk-chip-accent{background:var(--tk-accent-soft);color:var(--tk-accent) !important;border-color:transparent;}
.tk-chip-good{background:var(--tk-good-soft);color:var(--tk-good) !important;border-color:transparent;}
.tk-chip-warn{background:var(--tk-warn-soft);color:var(--tk-warn) !important;border-color:transparent;}
.tk-chip-danger{background:var(--tk-danger-soft);color:var(--tk-danger) !important;border-color:transparent;}

/* ============================================================
   Form controls
   ============================================================ */
.tk-input{
    width:100%;border:1.5px solid var(--tk-line);border-radius:var(--tk-r-md);
    padding:.95rem 1rem;font-size:1rem;font-family:inherit;
    background:#fff;color:var(--tk-ink);
    transition:border-color var(--tk-tr-fast), box-shadow var(--tk-tr-fast);
    min-height:50px;
}
.tk-input:focus{
    outline:0;border-color:var(--tk-brand);
    box-shadow:0 0 0 4px rgba(81,67,217,.12);
}
.tk-input::placeholder{color:#9aa1b5;}
.tk-label{
    display:block;font-weight:800;font-size:.92rem;
    color:var(--tk-ink) !important;margin-bottom:.55rem;
}
.tk-label .req{color:var(--tk-accent) !important;margin-left:.15rem;}

/* ============================================================
   Grid utility
   ============================================================ */
.tk-grid{display:grid;gap:1.2rem;}
.tk-grid-2{grid-template-columns:1fr;gap:1.2rem;}
.tk-grid-3{grid-template-columns:1fr;gap:1.2rem;}
.tk-grid-4{grid-template-columns:1fr;gap:1.1rem;}
@media (min-width:640px){
    .tk-grid-2{grid-template-columns:repeat(2,1fr);}
    .tk-grid-4{grid-template-columns:repeat(2,1fr);}
}
@media (min-width:900px){
    .tk-grid-3{grid-template-columns:repeat(3,1fr);}
    .tk-grid-4{grid-template-columns:repeat(4,1fr);}
}

/* ============================================================
   Floating Action Button (FAB) — 모든 페이지 공통
   - 모바일: bottom nav(약 76px) 위로 올림
   - 데스크탑: 우측 하단 24px
   ============================================================ */
.tk-fab{
    position:fixed;
    right:14px;
    bottom:calc(76px + max(8px, env(safe-area-inset-bottom)));
    z-index:var(--tk-z-fab);
    display:flex;flex-direction:column;gap:.55rem;
    align-items:flex-end;
}
.tk-fab a{
    display:inline-flex;align-items:center;gap:.5rem;
    padding:.9rem 1.3rem;border-radius:var(--tk-r-full);text-decoration:none;
    font-weight:800;font-size:.95rem;font-family:inherit;
    box-shadow:0 14px 30px -10px rgba(15,23,42,.3);
    transition:transform var(--tk-tr-fast), box-shadow var(--tk-tr-fast);
    white-space:nowrap;line-height:1;
}
.tk-fab a:hover{transform:translateY(-2px);box-shadow:0 18px 36px -10px rgba(81,67,217,.5);}
.tk-fab .fab-call{background:#fff;color:var(--tk-brand) !important;border:1.5px solid var(--tk-brand-soft);}
.tk-fab .fab-main{
    background:linear-gradient(120deg,var(--tk-brand),var(--tk-brand-2));
    color:#fff !important;padding:1.05rem 1.5rem;font-size:1rem;font-weight:900;
    box-shadow:0 18px 36px -10px rgba(81,67,217,.6);
    position:relative;isolation:isolate;
}
.tk-fab .fab-main::before{
    content:"";position:absolute;inset:0;border-radius:var(--tk-r-full);
    background:var(--tk-brand);z-index:-1;
    animation:tkFabPulse 2.2s ease-out infinite;
}
@keyframes tkFabPulse{
    0%{opacity:.55;transform:scale(1);}
    80%{opacity:0;transform:scale(1.35);}
    100%{opacity:0;transform:scale(1.35);}
}
@media (min-width:768px){
    .tk-fab{right:24px;gap:.65rem;}
}
@media (min-width:992px){
    /* 992px↑에서는 데스크탑 navbar 사용 (모바일 bottom nav 없음) → bottom 24px */
    .tk-fab{bottom:24px;}
}

/* ============================================================
   Background decoration helpers
   ============================================================ */
.tk-bg-grid{
    position:relative;
    background:
        radial-gradient(900px 480px at 100% 0%, rgba(81,67,217,.08), transparent 60%),
        radial-gradient(700px 480px at 0% 100%, rgba(255,107,53,.06), transparent 55%),
        linear-gradient(180deg,#fafbff 0%, #ffffff 100%);
    overflow:hidden;
}
.tk-bg-grid::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background-image:
        linear-gradient(rgba(81,67,217,.05) 1px,transparent 1px),
        linear-gradient(90deg,rgba(81,67,217,.05) 1px,transparent 1px);
    background-size:42px 42px;
    -webkit-mask-image:radial-gradient(70% 50% at 50% 30%,#000,transparent 90%);
    mask-image:radial-gradient(70% 50% at 50% 30%,#000,transparent 90%);
}
.tk-bg-soft{background:var(--tk-bg-soft);}
.tk-bg-brand-soft{background:var(--tk-brand-soft);}

/* ============================================================
   Section Side Nav — 스크롤 진행 인디케이터 (자동 감지)
   - 페이지의 .tk 스코프 안 섹션을 자동 감지
   - 우측 세로, 점 + 라벨, 현재 섹션 강조
   - 데스크탑(>=1200px)에서만 표시
   ============================================================ */
.tk-side-nav{
    position:fixed;
    right:22px;
    top:50%;
    transform:translateY(-50%);
    z-index:1035;
    display:none;
    flex-direction:column;
    gap:14px;
    align-items:flex-end;
    pointer-events:auto;
}
@media (min-width:1200px){
    .tk-side-nav{display:flex;}
}
.tk-side-nav-item{
    display:flex;
    align-items:center;
    gap:11px;
    text-decoration:none;
    cursor:pointer;
    font-family:'Pretendard','Pretendard Variable',-apple-system,sans-serif;
    font-size:.82rem;
    font-weight:700;
    letter-spacing:-0.02em;
    border:0;background:transparent;padding:2px 0;
    line-height:1;
}
.tk-side-nav-item .label{
    color:var(--tk-muted) !important;
    opacity:.7;
    transition:color .22s ease, opacity .22s ease, transform .22s ease;
    white-space:nowrap;
}
.tk-side-nav-item .dot{
    flex:0 0 auto;
    width:9px;height:9px;
    border-radius:50%;
    background:var(--tk-line);
    transition:background .22s ease, transform .22s ease, box-shadow .22s ease;
}
.tk-side-nav-item:hover .label{
    color:var(--tk-ink) !important;
    opacity:1;
}
.tk-side-nav-item:hover .dot{
    background:var(--tk-brand-2);
    transform:scale(1.2);
}
.tk-side-nav-item.is-active .label{
    color:var(--tk-brand) !important;
    opacity:1;
    font-weight:800;
}
.tk-side-nav-item.is-active .dot{
    background:var(--tk-brand);
    transform:scale(1.45);
    box-shadow:0 0 0 5px var(--tk-brand-soft);
}
/* 인쇄·브로셔 등에서 숨김 */
@media print{
    .tk-side-nav{display:none !important;}
}

/* ============================================================
   Accessibility
   ============================================================ */
@media (prefers-reduced-motion: reduce){
    .tk *,.tk *::before,.tk *::after,
    .tk-fab,.tk-fab .fab-main::before{
        animation-duration:.01ms !important;
        animation-iteration-count:1 !important;
        transition-duration:.01ms !important;
    }
}