/* ============================================
   AG-CONSTRUCTION – Stylesheet
   Technisch-klare Gestaltung für ein TGA-Zeichenbüro
   ============================================ */

:root {
    --color-primary: #0f2a44;       /* Tiefes Navy  */
    --color-primary-2: #1a3a5c;     /* Akzent Navy  */
    --color-accent: #f39200;        /* Signal-Orange */
    --color-accent-2: #f39200;      /* Orange       */
    --color-dark: #1c1f22;
    --color-grey-900: #2a2e33;
    --color-grey-700: #55595f;
    --color-grey-500: #8a8f96;
    --color-grey-300: #d7dbe0;
    --color-grey-100: #f2f4f7;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f9fb;
    --radius: 3px;
    --maxw: 1200px;
    --shadow: 0 4px 20px rgba(15, 42, 68, 0.08);
    --shadow-lg: 0 10px 40px rgba(15, 42, 68, 0.12);
    --transition: 0.25s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-grey-900);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
    font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-primary);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
}

h1 { font-size: 2.8rem; margin-bottom: 1rem; }
h2 { font-size: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; margin-bottom: .5rem; }

p { margin-bottom: 1rem; color: var(--color-grey-700); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- TOPBAR ---------- */
.topbar {
    background: var(--color-primary);
    color: #cfd8e3;
    font-size: 0.85rem;
    padding: .55rem 0;
}
.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: .5rem;
}
.topbar a { color: #cfd8e3; }
.topbar a:hover { color: #fff; }
.topbar .meta { display: flex; gap: 1.5rem; flex-wrap: wrap; }

/* ---------- HEADER / NAV ---------- */
.site-header {
    background: #fff;
    border-bottom: 1px solid var(--color-grey-300);
    position: sticky;
    top: 0;
    z-index: 50;
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 80px;
}
.logo {
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: .55rem;
}
.logo .mark {
    width: 36px; height: 36px;
    background: var(--color-primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: .9rem;
    font-weight: 800;
    border-radius: 2px;
    position: relative;
}
.logo .mark::after {
    content: "";
    position: absolute; right: -3px; bottom: -3px;
    width: 10px; height: 10px;
    background: var(--color-accent);
}
.logo small { display: block; font-weight: 400; font-size: .7rem; color: var(--color-grey-500); letter-spacing: .12em; text-transform: uppercase; }

nav.main-nav ul {
    list-style: none;
    display: flex;
    gap: .25rem;
}
nav.main-nav a {
    display: block;
    padding: .6rem 1rem;
    color: var(--color-grey-900);
    font-weight: 600;
    font-size: .95rem;
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
}
nav.main-nav a:hover,
nav.main-nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-accent);
}

.nav-toggle {
    display: none;
    background: none; border: 0;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--color-primary);
}

/* ---------- HERO ---------- */
.hero {
    position: relative;
    background:
      linear-gradient(rgba(15, 42, 68, 0.82), rgba(15, 42, 68, 0.88)),
      repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 50px),
      repeating-linear-gradient(0deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 50px),
      var(--color-primary);
    color: #fff;
    padding: 6rem 0 5rem;
    overflow: hidden;
}
.hero::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
}
.hero .eyebrow {
    display: inline-block;
    font-size: .85rem;
    letter-spacing: .25em;
    text-transform: uppercase;
    color: var(--color-accent-2);
    margin-bottom: 1rem;
    font-weight: 600;
}
.hero h1 {
    color: #fff;
    font-size: 3.2rem;
    margin-bottom: 1.2rem;
    max-width: 760px;
}
.hero h1 span { color: var(--color-accent-2); }
.hero p.lead {
    font-size: 1.15rem;
    color: #cfd8e3;
    max-width: 640px;
    margin-bottom: 2rem;
}
.hero .cta-group { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .85rem 1.8rem;
    font-weight: 600;
    font-size: .95rem;
    letter-spacing: .02em;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}
.btn-primary { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }
.btn-primary:hover { background: #c47500; border-color: #c47500; color: #fff; }
.btn-outline { background: transparent; color: #fff; border-color: #fff; }
.btn-outline:hover { background: #fff; color: var(--color-primary); }
.btn-dark { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-dark:hover { background: var(--color-primary-2); border-color: var(--color-primary-2); color: #fff; }

/* ---------- SECTIONS ---------- */
section { padding: 5rem 0; }
section.alt { background: var(--color-bg-alt); }

.section-head { text-align: center; margin-bottom: 3rem; }
.section-head .eyebrow {
    display: inline-block;
    font-size: .8rem;
    letter-spacing: .25em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: .75rem;
    font-weight: 700;
}
.section-head h2 { margin-bottom: .5rem; }
.section-head p { max-width: 680px; margin: 0 auto; }

/* ---------- GRID ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- CARDS ---------- */
.card {
    background: #fff;
    border: 1px solid var(--color-grey-300);
    padding: 2rem 1.75rem;
    border-radius: var(--radius);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: transparent;
}
.card:hover::before { transform: scaleX(1); }

.card .icon {
    width: 60px; height: 60px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-grey-300);
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--color-primary);
    transition: all var(--transition);
}
.card:hover .icon {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.card .icon svg {
    width: 30px; height: 30px;
    stroke-width: 1.75;
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: url(#sketch);
}

/* Pencil-on-paper style for all inline icons – keeps the technical drawing feel */
svg[stroke="currentColor"] {
    stroke-linecap: round;
    stroke-linejoin: round;
}
.contact-info .info-row svg {
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: url(#sketch);
}
.card h3 { margin-bottom: .5rem; font-size: 1.15rem; }
.card p { font-size: .95rem; margin-bottom: 0; }

/* ---------- FEATURE LIST ---------- */
.feature-list {
    list-style: none;
    padding: 0;
}
.feature-list li {
    position: relative;
    padding: .75rem 0 .75rem 2rem;
    border-bottom: 1px solid var(--color-grey-300);
    color: var(--color-grey-900);
}
.feature-list li:last-child { border-bottom: 0; }
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0; top: 1.15rem;
    width: 14px; height: 14px;
    background: var(--color-accent);
    clip-path: polygon(0 0, 100% 50%, 0 100%);
}

/* ---------- TWO COL ---------- */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.two-col .visual {
    aspect-ratio: 4 / 3;
    background:
      repeating-linear-gradient(90deg, rgba(15,42,68,0.05) 0 1px, transparent 1px 30px),
      repeating-linear-gradient(0deg, rgba(15,42,68,0.05) 0 1px, transparent 1px 30px),
      linear-gradient(135deg, #f7f9fb 0%, #eef2f7 100%);
    border: 1px solid var(--color-grey-300);
    position: relative;
    overflow: hidden;
}
.two-col .visual svg { width: 100%; height: 100%; }

/* ---------- CTA STRIPE ---------- */
.cta-stripe {
    background: var(--color-primary);
    color: #fff;
    padding: 3rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-stripe::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--color-accent);
}
.cta-stripe h2 { color: #fff; margin-bottom: .5rem; }
.cta-stripe p { color: #cfd8e3; margin-bottom: 1.5rem; }

/* ---------- FOOTER ---------- */
.site-footer {
    background: var(--color-dark);
    color: #a6acb4;
    padding: 3.5rem 0 0;
    font-size: .92rem;
}
.site-footer a { color: #cfd8e3; }
.site-footer a:hover { color: var(--color-accent-2); }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: .05em; }
.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr 1fr 1fr;
    gap: 2rem;
    padding-bottom: 2.5rem;
}
.footer-grid ul { list-style: none; }
.footer-grid ul li { padding: .25rem 0; }
.footer-bottom {
    border-top: 1px solid #333;
    padding: 1.25rem 0;
    text-align: center;
    font-size: .85rem;
}

/* ---------- CONTACT ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}
.contact-info {
    background: var(--color-primary);
    color: #fff;
    padding: 2.5rem;
}
.contact-info h3 { color: #fff; }
.contact-info p { color: #cfd8e3; }
.contact-info .info-row {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.contact-info .info-row:last-child { border-bottom: 0; }
.contact-info .info-row svg { flex-shrink: 0; color: var(--color-accent-2); }
.contact-info .info-row strong { display: block; color: #fff; font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: .25rem; }

form .field {
    margin-bottom: 1.25rem;
}
form label {
    display: block;
    font-weight: 600;
    font-size: .9rem;
    margin-bottom: .5rem;
    color: var(--color-grey-900);
}
form input, form textarea, form select {
    width: 100%;
    padding: .8rem 1rem;
    border: 1px solid var(--color-grey-300);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    background: #fff;
    transition: border-color var(--transition);
}
form input:focus, form textarea:focus, form select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(15, 42, 68, 0.1);
}
form textarea { min-height: 150px; resize: vertical; }

/* ---------- PAGE HEADER ---------- */
.page-header {
    background:
      linear-gradient(rgba(15, 42, 68, 0.88), rgba(15, 42, 68, 0.92)),
      repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 40px),
      repeating-linear-gradient(0deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 40px),
      var(--color-primary);
    color: #fff;
    padding: 4rem 0 3rem;
    position: relative;
}
.page-header::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--color-accent);
}
.page-header h1 { color: #fff; font-size: 2.4rem; margin-bottom: .5rem; }
.page-header .breadcrumb {
    font-size: .85rem;
    color: #cfd8e3;
    letter-spacing: .05em;
}
.page-header .breadcrumb a { color: var(--color-accent-2); }

/* ---------- STATS ---------- */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}
.stat-num {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: .25rem;
}
.stat-label {
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-grey-700);
    font-weight: 600;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
    .grid-3, .grid-4, .footer-grid, .stats, .contact-grid, .two-col { grid-template-columns: 1fr 1fr; }
    .hero h1 { font-size: 2.3rem; }
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.6rem; }
}
@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-4, .footer-grid, .stats, .contact-grid, .two-col { grid-template-columns: 1fr; }
    nav.main-nav { display: none; position: absolute; top: 80px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--color-grey-300); }
    nav.main-nav.open { display: block; }
    nav.main-nav ul { flex-direction: column; padding: 1rem; }
    .nav-toggle { display: block; }
    .hero { padding: 4rem 0 3rem; }
    .hero h1 { font-size: 1.9rem; }
    section { padding: 3rem 0; }
    .topbar .meta { gap: .75rem; font-size: .78rem; }
}