/* ==========================================================================
   KTA PRINT — CSS chính
   Màu sắc & font đúng theo brief thiết kế.
   ========================================================================== */

:root {
    --kta-primary: #123B63;
    --kta-secondary: #2F6B9A;
    --kta-cta: #F28C28;
    --kta-cta-dark: #d97814;
    --kta-text: #1D2733;
    --kta-muted: #5D6975;
    --kta-border: #D9E1E8;
    --kta-bg-soft: #F5F8FB;
    --kta-white: #ffffff;
    --kta-radius: 12px;
    --kta-shadow: 0 4px 18px rgba(18, 59, 99, 0.08);
    --kta-shadow-hover: 0 8px 28px rgba(18, 59, 99, 0.16);
    --kta-maxw: 1160px;
}

/* ===== Reset nhẹ ===== */
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--kta-text);
    line-height: 1.6;
    background: var(--kta-white);
    -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 {
    font-family: 'Manrope', sans-serif;
    font-weight: 700;
    line-height: 1.25;
    color: var(--kta-primary);
    margin: 0 0 .5em;
}
a { color: var(--kta-secondary); text-decoration: none; }
a:hover { color: var(--kta-primary); }
img { max-width: 100%; height: auto; display: block; }

.kta-container { max-width: var(--kta-maxw); margin: 0 auto; padding: 0 20px; }

/* ===== Nút ===== */
.kta-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 14px 28px; border-radius: var(--kta-radius);
    font-family: 'Manrope', sans-serif; font-weight: 600; font-size: 15px;
    cursor: pointer; border: 2px solid transparent; transition: all .2s ease;
    text-align: center;
}
.kta-btn-sm { padding: 9px 16px; font-size: 14px; }
.kta-btn-block { width: 100%; }
.kta-btn-cta { background: var(--kta-cta); color: #fff; }
.kta-btn-cta:hover { background: var(--kta-cta-dark); color: #fff; transform: translateY(-2px); }
.kta-btn-outline { background: transparent; color: var(--kta-primary); border-color: var(--kta-border); }
.kta-btn-outline:hover { border-color: var(--kta-secondary); color: var(--kta-secondary); }

/* ===== Header ===== */
.kta-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,.96); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--kta-border);
}
.kta-header-inner { display: flex; align-items: center; gap: 24px; height: 70px; }
.kta-logo-text {
    font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 24px;
    color: var(--kta-primary);
}
.kta-logo-text span { color: var(--kta-cta); }
.kta-nav { margin-left: auto; }
.kta-menu { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.kta-menu a {
    font-family: 'Manrope', sans-serif; font-weight: 600; font-size: 15px;
    color: var(--kta-text);
}
.kta-menu a:hover { color: var(--kta-cta); }
.kta-header-cta { display: flex; gap: 10px; }
.kta-nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.kta-nav-toggle span { width: 24px; height: 2px; background: var(--kta-primary); display: block; transition: .3s; }

/* ===== Section chung ===== */
.kta-section { padding: 72px 0; }
.kta-section-title { font-size: 32px; text-align: center; margin-bottom: 8px; }
.kta-section-lead, .kta-section > .kta-container > .kta-section-lead {
    text-align: center; color: var(--kta-muted); margin-bottom: 40px; font-size: 17px;
}
.kta-empty { text-align: center; color: var(--kta-muted); grid-column: 1/-1; padding: 30px; }

/* ===== Hero ===== */
.kta-hero {
    background: linear-gradient(135deg, var(--kta-primary) 0%, var(--kta-secondary) 100%);
    color: #fff; padding: 90px 0;
}
.kta-hero-title { color: #fff; font-size: 44px; max-width: 800px; }
.kta-hero-sub { font-size: 19px; max-width: 640px; opacity: .95; margin: 18px 0 30px; }
.kta-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.kta-hero .kta-btn-outline { color: #fff; border-color: rgba(255,255,255,.5); }
.kta-hero .kta-btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.1); color: #fff; }
.kta-trust-badges { list-style: none; padding: 0; margin: 34px 0 0; display: flex; gap: 24px; flex-wrap: wrap; }
.kta-trust-badges li { font-size: 15px; opacity: .95; }

/* ===== Vấn đề khách hàng ===== */
.kta-problems { background: var(--kta-bg-soft); }
.kta-badge-list { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 30px; }
.kta-problem-badge {
    background: #fff; border: 1px solid var(--kta-border); border-radius: 30px;
    padding: 10px 20px; font-size: 15px; color: var(--kta-text); box-shadow: var(--kta-shadow);
}

/* ===== Grid ===== */
.kta-grid { display: grid; gap: 24px; }
.kta-grid-2 { grid-template-columns: repeat(2, 1fr); }
.kta-grid-3 { grid-template-columns: repeat(3, 1fr); }
.kta-grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Card ===== */
.kta-card {
    display: block; background: #fff; border: 1px solid var(--kta-border);
    border-radius: var(--kta-radius); overflow: hidden; box-shadow: var(--kta-shadow);
    transition: all .25s ease; color: var(--kta-text);
}
.kta-card:hover { transform: translateY(-4px); box-shadow: var(--kta-shadow-hover); }
.kta-card-thumb { aspect-ratio: 3/2; overflow: hidden; background: var(--kta-bg-soft); }
.kta-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.kta-card-thumb-placeholder { display: flex; align-items: center; justify-content: center; font-size: 48px; }
.kta-card-body { padding: 20px 22px; }
.kta-card-title { font-size: 19px; margin-bottom: 8px; }
.kta-card-excerpt { color: var(--kta-muted); font-size: 15px; margin: 0 0 12px; }
.kta-card-link { color: var(--kta-cta); font-weight: 600; font-size: 14px; font-family: 'Manrope', sans-serif; }
.kta-card-date { font-size: 13px; color: var(--kta-muted); }

/* ===== Doanh nghiệp phù hợp ===== */
.kta-audience-card {
    background: var(--kta-bg-soft); border-radius: var(--kta-radius); padding: 26px 18px;
    text-align: center; display: flex; flex-direction: column; align-items: center; gap: 12px;
    font-weight: 600; font-family: 'Manrope', sans-serif; color: var(--kta-primary);
    border: 1px solid var(--kta-border);
}
.kta-audience-icon { font-size: 38px; }

/* ===== Vì sao chọn ===== */
.kta-why { background: var(--kta-bg-soft); }
.kta-why-list { list-style: none; padding: 0; max-width: 760px; margin: 30px auto 0;
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.kta-why-item {
    background: #fff; border: 1px solid var(--kta-border); border-radius: var(--kta-radius);
    padding: 16px 20px; font-weight: 500; color: var(--kta-text);
}

/* ===== Quy trình ===== */
.kta-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; margin-top: 30px; }
.kta-step { text-align: center; }
.kta-step-num {
    width: 54px; height: 54px; border-radius: 50%; margin: 0 auto 14px;
    background: var(--kta-cta); color: #fff; display: flex; align-items: center; justify-content: center;
    font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 22px;
}
.kta-step-title { font-size: 17px; margin-bottom: 6px; }
.kta-step-desc { font-size: 14px; color: var(--kta-muted); margin: 0; }

/* ===== Bằng chứng ===== */
.kta-proof { background: var(--kta-primary); color: #fff; }
.kta-proof .kta-section-title { color: #fff; }
.kta-proof-item { text-align: center; padding: 20px; }
.kta-proof-num { font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 40px; color: var(--kta-cta); }
.kta-proof-label { font-size: 15px; opacity: .9; margin-top: 6px; }

/* ===== Form liên hệ ===== */
.kta-contact-sec { background: var(--kta-bg-soft); }
.kta-contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.kta-contact-text .kta-section-title { text-align: left; }
.kta-contact-phone { font-size: 17px; font-weight: 600; margin: 8px 0; }
.kta-contact-form-wrap {
    background: #fff; border: 1px solid var(--kta-border); border-radius: 16px;
    padding: 30px; box-shadow: var(--kta-shadow);
}
.kta-form-row { margin-bottom: 16px; }
.kta-form-row label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; font-family: 'Manrope', sans-serif; }
.kta-form-row input, .kta-form-row textarea {
    width: 100%; padding: 12px 14px; border: 1px solid var(--kta-border);
    border-radius: 10px; font-family: inherit; font-size: 15px; color: var(--kta-text);
}
.kta-form-row input:focus, .kta-form-row textarea:focus {
    outline: none; border-color: var(--kta-secondary); box-shadow: 0 0 0 3px rgba(47,107,154,.15);
}
.kta-form-note { font-size: 13px; color: var(--kta-muted); text-align: center; margin: 12px 0 0; }
.kta-alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 18px; font-size: 15px; }
.kta-alert-success { background: #e7f6ec; color: #1b7a3d; border: 1px solid #b6e2c4; }
.kta-alert-error { background: #fdecec; color: #b62828; border: 1px solid #f4c4c4; }

/* ===== Sticky CTA mobile ===== */
.kta-sticky-cta { display: none; }

/* ===== Single / bài viết ===== */
.kta-single-narrow { max-width: 820px; }
.kta-breadcrumb { font-size: 14px; color: var(--kta-muted); margin-bottom: 20px; }
.kta-single-title { font-size: 34px; margin-bottom: 16px; }
.kta-single-meta { color: var(--kta-muted); font-size: 14px; margin-bottom: 20px; }
.kta-single-thumb { border-radius: 14px; overflow: hidden; margin-bottom: 28px; }
.kta-single-content { font-size: 17px; color: var(--kta-text); }
.kta-single-content h2, .kta-single-content h3 { margin-top: 1.6em; }
.kta-single-content img { border-radius: 10px; margin: 20px 0; }
.kta-single-cta {
    margin-top: 40px; padding: 32px; background: var(--kta-bg-soft);
    border-radius: 16px; text-align: center; border: 1px solid var(--kta-border);
}
.kta-single-cta h3 { font-size: 22px; }
.kta-single-cta .kta-btn { margin: 8px 6px 0; }
.kta-related { margin-top: 56px; }
.kta-pagination { margin-top: 40px; text-align: center; }
.kta-pagination .page-numbers {
    display: inline-block; padding: 8px 14px; margin: 0 3px; border: 1px solid var(--kta-border);
    border-radius: 8px; color: var(--kta-text);
}
.kta-pagination .current { background: var(--kta-primary); color: #fff; border-color: var(--kta-primary); }

/* ===== Footer ===== */
.kta-footer { background: var(--kta-text); color: #cfd6dd; padding: 56px 0 0; }
.kta-footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.kta-footer-logo { color: #fff; margin-bottom: 14px; }
.kta-footer-desc { font-size: 15px; line-height: 1.7; }
.kta-footer-widget-title { color: #fff; font-size: 16px; margin-bottom: 14px; }
.kta-footer a { color: #cfd6dd; }
.kta-footer a:hover { color: var(--kta-cta); }
.kta-footer-links { list-style: none; padding: 0; margin: 0; }
.kta-footer-links li { margin-bottom: 8px; }
.kta-footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding: 20px 0; font-size: 14px; color: #9aa5af; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 992px) {
    .kta-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .kta-steps { grid-template-columns: repeat(2, 1fr); }
    .kta-hero-title { font-size: 36px; }
    .kta-contact-inner { grid-template-columns: 1fr; gap: 30px; }
    .kta-footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .kta-section { padding: 48px 0; }
    .kta-section-title { font-size: 26px; }
    .kta-header-cta { display: none; }
    .kta-nav {
        position: fixed; top: 70px; left: 0; right: 0; background: #fff;
        border-bottom: 1px solid var(--kta-border); padding: 20px;
        transform: translateY(-120%); transition: transform .3s ease; margin: 0;
        box-shadow: var(--kta-shadow);
    }
    .kta-nav.kta-open { transform: translateY(0); }
    .kta-menu { flex-direction: column; gap: 4px; }
    .kta-menu a { display: block; padding: 12px 4px; border-bottom: 1px solid var(--kta-border); }
    .kta-nav-toggle { display: flex; margin-left: auto; }

    .kta-grid-3, .kta-grid-4, .kta-grid-2 { grid-template-columns: 1fr; }
    .kta-why-list { grid-template-columns: 1fr; }
    .kta-steps { grid-template-columns: 1fr; }
    .kta-hero { padding: 56px 0; }
    .kta-hero-title { font-size: 30px; }
    .kta-hero-sub { font-size: 17px; }
    .kta-trust-badges { flex-direction: column; gap: 10px; }
    .kta-footer-grid { grid-template-columns: 1fr; gap: 28px; }

    /* Sticky CTA hiện trên mobile */
    .kta-sticky-cta {
        display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
        background: #fff; border-top: 1px solid var(--kta-border); box-shadow: 0 -4px 16px rgba(0,0,0,.08);
    }
    .kta-sticky-btn {
        flex: 1; text-align: center; padding: 14px 6px; font-family: 'Manrope', sans-serif;
        font-weight: 600; font-size: 14px; border-right: 1px solid var(--kta-border);
    }
    .kta-sticky-btn:last-child { border-right: none; }
    .kta-sticky-call { color: var(--kta-secondary); }
    .kta-sticky-zalo { color: var(--kta-primary); }
    .kta-sticky-form { background: var(--kta-cta); color: #fff; }
    body { padding-bottom: 56px; } /* chừa chỗ cho sticky CTA */
}