/* ==========================================================================
   NS TECH (nst-ai.com) — 기본 스타일
   디자인 톤: 미니멀, 짙은 네이비 + 화이트, 액센트 시안
   ========================================================================== */

:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fa;
    --color-ink: #0f1e3d;
    --color-ink-soft: #41506b;
    --color-ink-mute: #7a8699;
    --color-line: #e3e8f0;
    --color-accent: #00b894;
    --color-accent-dark: #009378;
    --color-navy: #0f1e3d;
    --color-navy-dark: #07142e;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 2px rgba(15, 30, 61, 0.04), 0 1px 3px rgba(15, 30, 61, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 30, 61, 0.06), 0 2px 4px rgba(15, 30, 61, 0.04);
    --shadow-lg: 0 12px 32px rgba(15, 30, 61, 0.10), 0 4px 8px rgba(15, 30, 61, 0.06);

    --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, '맑은 고딕', 'Malgun Gothic', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-ink);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-accent); }

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* -------- Header -------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--color-line);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    color: var(--color-navy);
}

.logo-mark-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
}

.logo-full-img {
    height: 54px;
    width: auto;
    object-fit: contain;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
    font-size: 16px;
}

.logo-text small {
    font-size: 11px;
    color: var(--color-ink-mute);
    font-weight: 500;
}

.nav {
    display: flex;
    gap: 28px;
    font-weight: 600;
    font-size: 15px;
    color: var(--color-ink-soft);
}

/* -------- Hero -------- */
.hero {
    position: relative;
    padding: 96px 0 112px;
    background:
        radial-gradient(1100px 500px at 80% -10%, rgba(0, 184, 148, 0.10), transparent 60%),
        linear-gradient(180deg, var(--color-navy-dark) 0%, var(--color-navy) 100%);
    color: #fff;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 1px;
    background: rgba(255,255,255,0.08);
}

.hero-eyebrow {
    margin: 0 0 16px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--color-accent);
}

.hero-title {
    margin: 0 0 24px;
    font-size: clamp(32px, 5vw, 56px);
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.02em;
}

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

.hero-sub {
    max-width: 720px;
    margin: 0 0 36px;
    font-size: 17px;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.7;
}

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* -------- Buttons -------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 26px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 15px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .15s ease, background .15s ease, color .15s ease, border-color .15s ease;
}

.btn-sm { padding: 9px 18px; font-size: 14px; }

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; transform: translateY(-1px); }

.btn-ghost {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.30);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }

.tool-card .btn-ghost {
    color: var(--color-navy);
    border-color: var(--color-line);
}
.tool-card .btn-ghost:hover {
    background: var(--color-bg-alt);
    color: var(--color-navy);
}

/* -------- Section common -------- */
section { padding: 96px 0; }

.section-title {
    margin: 0 0 8px;
    font-size: clamp(26px, 3vw, 36px);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-navy);
}

.section-sub {
    margin: 0 0 48px;
    font-size: 16px;
    color: var(--color-ink-soft);
}

/* -------- About -------- */
.about { background: var(--color-bg-alt); }

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.about-card {
    padding: 32px 28px;
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    transition: transform .2s ease, box-shadow .2s ease;
}

.about-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.about-num {
    display: inline-block;
    margin-bottom: 16px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--color-accent);
}

.about-card h3 {
    margin: 0 0 12px;
    font-size: 19px;
    font-weight: 700;
    color: var(--color-navy);
}

.about-card p {
    margin: 0;
    font-size: 15px;
    color: var(--color-ink-soft);
    line-height: 1.7;
}

/* -------- Tools -------- */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.tool-card {
    display: flex;
    flex-direction: column;
    padding: 32px 28px;
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.tool-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.tool-badge {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(0, 184, 148, 0.10);
    color: var(--color-accent-dark);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.tool-badge-soon {
    background: rgba(122, 134, 153, 0.12);
    color: var(--color-ink-mute);
}

.tool-version {
    font-family: 'D2Coding', 'Consolas', monospace;
    font-size: 13px;
    color: var(--color-ink-mute);
    font-weight: 600;
}

.tool-name {
    margin: 0 0 12px;
    font-size: 22px;
    font-weight: 800;
    color: var(--color-navy);
    letter-spacing: -0.01em;
}

.tool-desc {
    margin: 0 0 20px;
    font-size: 14.5px;
    color: var(--color-ink-soft);
    line-height: 1.65;
    flex-grow: 1;
}

.tool-meta {
    list-style: none;
    margin: 0 0 24px;
    padding: 16px 0;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
    font-size: 13.5px;
    color: var(--color-ink-soft);
}

.tool-meta li { padding: 4px 0; }
.tool-meta strong {
    display: inline-block;
    width: 50px;
    color: var(--color-ink-mute);
    font-weight: 600;
}

.tool-auth {
    margin-bottom: 16px;
    padding: 8px 12px;
    background: rgba(0, 184, 148, 0.08);
    border: 1px solid rgba(0, 184, 148, 0.25);
    border-radius: 6px;
    font-size: 12.5px;
    color: var(--color-accent-dark);
    font-weight: 600;
}

.tool-actions { display: flex; gap: 8px; }

.tool-card-coming {
    background: var(--color-bg-alt);
    border-style: dashed;
    border-color: var(--color-line);
}
.tool-card-coming:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--color-line);
}

/* -------- Contact -------- */
.contact { background: var(--color-navy); color: #fff; }
.contact .section-title { color: #fff; }

.contact-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.contact-text p {
    margin: 0;
    font-size: 16px;
    color: rgba(255, 255, 255, 0.75);
}

.contact-info {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: var(--radius-md);
    padding: 28px 32px;
}

.contact-row {
    display: flex;
    align-items: baseline;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.contact-row:last-child { border-bottom: none; }

.contact-label {
    width: 80px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--color-accent);
    text-transform: uppercase;
}

.contact-value { font-size: 16px; }
.contact-value a:hover { color: var(--color-accent); }

/* -------- Footer -------- */
.site-footer {
    background: var(--color-navy-dark);
    color: rgba(255, 255, 255, 0.70);
    padding: 36px 0;
    font-size: 13.5px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-brand { color: #fff; font-weight: 700; margin-bottom: 6px; }
.footer-notice { color: rgba(255, 255, 255, 0.55); font-size: 13px; max-width: 540px; }
.footer-right { text-align: right; }
.footer-domain { color: #fff; font-weight: 700; font-size: 14px; }
.footer-copy { color: rgba(255, 255, 255, 0.45); margin-top: 6px; font-size: 12.5px; }

.footer-links { margin-top: 14px; font-size: 13px; }
.footer-links a {
    color: rgba(255, 255, 255, 0.75);
    border-bottom: 1px solid rgba(255, 255, 255, 0.20);
    padding-bottom: 1px;
}
.footer-links a:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }

/* -------- Legal pages (privacy, terms) -------- */
.legal { padding: 80px 0 96px; }
.legal-title {
    font-size: clamp(28px, 3.4vw, 38px);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-navy);
    margin: 0 0 24px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--color-navy);
}
.legal-lead {
    font-size: 16px;
    color: var(--color-ink-soft);
    line-height: 1.8;
    margin-bottom: 40px;
    padding: 20px 24px;
    background: var(--color-bg-alt);
    border-left: 4px solid var(--color-accent);
    border-radius: 4px;
}
.legal h2 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-navy);
    margin: 36px 0 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-line);
}
.legal p, .legal ul, .legal ol {
    font-size: 15px;
    color: var(--color-ink-soft);
    line-height: 1.85;
    margin: 0 0 14px;
}
.legal ul, .legal ol { padding-left: 24px; }
.legal ul li, .legal ol li { margin-bottom: 6px; }
.legal a {
    color: var(--color-accent-dark);
    text-decoration: underline;
}
.legal-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0 14px;
    font-size: 14.5px;
}
.legal-table th, .legal-table td {
    padding: 10px 14px;
    border: 1px solid var(--color-line);
    text-align: left;
    color: var(--color-ink-soft);
}
.legal-table th {
    background: var(--color-bg-alt);
    color: var(--color-navy);
    font-weight: 700;
    width: 180px;
}
.legal-effective {
    margin-top: 48px;
    padding: 18px 22px;
    background: var(--color-bg-alt);
    border-radius: 8px;
    font-size: 15px;
    color: var(--color-navy);
}

/* -------- Responsive -------- */
@media (max-width: 880px) {
    .nav { display: none; }
    .hero { padding: 72px 0 88px; }
    .about-grid, .tool-grid { grid-template-columns: 1fr; }
    .contact-inner { grid-template-columns: 1fr; gap: 32px; }
    section { padding: 72px 0; }
    .footer-inner { flex-direction: column; }
    .footer-right { text-align: left; }
}