/* ===================================================================
   TK Construction — Base: reset nhẹ, typography, container, tiện ích chung
   =================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-display);
    font-size: var(--fs-body);
    line-height: 1.7;
    color: var(--c-body);
    background: var(--c-bg);
    -webkit-font-smoothing: antialiased;
    font-weight: 400;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

    a:hover {
        color: var(--c-accent);
    }

h1, h2, h3, h4, h5 {
    font-family: var(--font-display);
    color: var(--c-primary);
    line-height: 1.25;
    margin: 0 0 .6em;
    font-weight: 500;
}

h1 {
    font-size: var(--fs-h1);
}

h2 {
    font-size: var(--fs-h2);
}

h3 {
    font-size: var(--fs-h3);
}

p {
    margin: 0 0 1.1em;
}

    p:last-child {
        margin-bottom: 0;
    }

ul, ol {
    margin: 0 0 1.1em;
    padding-left: 1.25em;
}

hr {
    border: 0;
    border-top: 1px solid var(--c-line);
    margin: var(--sp-block) 0;
}

::selection {
    background: var(--c-accent);
    color: var(--c-white);
}

:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

/* ---------------------------------------------- Layout khung ------ */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 18px;
}

.section {
    padding: var(--sp-section) 0;
}

.section-soft,
.section-alt {
    background: var(--c-bg-soft);
}

/* Nền giấy bản vẽ — dùng cho các section sáng (công trình, dịch vụ, tin tức, trang con) */
.section-blueprint {
    background: var(--c-bg-soft) url(../images/tk/bg-congtrinh.jpg) center top / cover no-repeat;
}

.section-dark {
    background: var(--c-primary-dark) url(../images/tk/bg-thietke.jpg) center / cover no-repeat;
    color: rgba(255, 255, 255, .86);
}

    .section-dark h2, .section-dark h3 {
        color: var(--c-white);
    }

/* ---------------------------------------------- Kicker ------------ */
/* Nhãn nhỏ in hoa màu cam phía trên tiêu đề section ("CÔNG TRÌNH", "DỊCH VỤ") */
.kicker {
    display: block;
    font-size: var(--fs-kicker);
    font-weight: 400;
    letter-spacing: .01em;
    text-transform: uppercase;
    color: var(--c-accent);
    margin-bottom: 4px;
    line-height: 1.3;
    font-family: var(--font-base);
}

.section-dark .kicker {
    color: var(--c-white);
}

/* ---------------------------------------------- Tiện ích ---------- */
.text-center {
    text-align: center;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Nội dung soạn từ trình soạn thảo Admin */
.rich-text h2, .rich-text h3 {
    margin-top: 1.4em;
}

.rich-text img {
    margin: 1.2em 0;
    border-radius: var(--radius);
}

.rich-text table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.2em 0;
}

.rich-text th, .rich-text td {
    border: 1px solid var(--c-line);
    padding: 10px 12px;
    text-align: left;
}

.rich-text th {
    background: var(--c-bg-soft);
    color: var(--c-primary);
    font-weight: 600;
}

.rich-text blockquote {
    margin: 1.4em 0;
    padding: 4px 0 4px 22px;
    border-left: var(--rule) solid var(--c-accent);
    font-size: var(--fs-lead);
    color: var(--c-primary);
}