/* ===========================================
   Ing. Krechlerová — TZB Projects Design
   Clean technical aesthetic
   =========================================== */

:root {
    --color-bg: #F7F8FA;
    --color-surface: #ECEEF2;
    --color-deep: #0F2840;
    --color-slate: #1E3A5F;
    --color-teal: #0D9488;
    --color-teal-light: #14B8A6;
    --color-text: #334155;
    --color-light-text: #64748B;
    --color-white: #FFFFFF;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Outfit', -apple-system, sans-serif;
    --shadow-soft: 0 4px 24px rgba(15, 40, 64, 0.06);
    --shadow-card: 0 8px 32px rgba(15, 40, 64, 0.10);
    --radius: 10px;
    --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ---- Navigation ---- */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(247, 248, 250, 0.94);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(15, 40, 64, 0.06);
    transition: box-shadow 0.3s;
}
.nav.scrolled { box-shadow: var(--shadow-soft); }
.nav-inner {
    max-width: 1100px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; height: 72px;
}
.nav-logo {
    display: flex; align-items: center; gap: 8px;
    font-family: var(--font-display); font-size: 1.1rem;
    color: var(--color-deep); text-decoration: none; font-weight: 600;
}
.nav-logo-icon { font-size: 1.3rem; }
.nav-links { display: flex; list-style: none; gap: 32px; }
.nav-links a {
    text-decoration: none; color: var(--color-light-text);
    font-size: 0.9rem; font-weight: 600; letter-spacing: 0.03em;
    transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-deep); }
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--color-teal); transition: width 0.3s;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
    display: block; width: 24px; height: 2px;
    background: var(--color-deep); border-radius: 2px;
}

/* ---- Hero ---- */
.hero {
    position: relative; height: 100vh; min-height: 580px;
    display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to bottom, rgba(15,40,64,0.65) 0%, rgba(15,40,64,0.3) 50%, rgba(15,40,64,0.7) 100%);
    z-index: 1;
}
.hero-content {
    position: relative; z-index: 2; text-align: center;
    color: var(--color-white); padding: 0 24px;
}
.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.1); backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 20px; border-radius: 50px;
    font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em;
    text-transform: uppercase; margin-bottom: 24px;
}
.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5.5rem); font-weight: 700; line-height: 1.05; margin-bottom: 16px;
}
.hero-accent { color: var(--color-teal-light); }
.hero-sub {
    font-size: clamp(1rem, 2vw, 1.2rem); font-weight: 300;
    opacity: 0.85; margin-bottom: 36px; letter-spacing: 0.08em;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---- Buttons ---- */
.btn {
    display: inline-block; padding: 14px 32px; border-radius: 6px;
    font-size: 0.95rem; font-weight: 600; text-decoration: none;
    cursor: pointer; border: 2px solid transparent;
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
    background: var(--color-teal); color: var(--color-white);
    border-color: var(--color-teal);
}
.btn-primary:hover {
    background: var(--color-teal-light); border-color: var(--color-teal-light);
    box-shadow: 0 8px 24px rgba(13,148,136,0.25);
}
.btn-outline {
    background: transparent; color: var(--color-white);
    border-color: rgba(255,255,255,0.35);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.6);
}
.btn-full { width: 100%; text-align: center; }

/* ---- Section Tags ---- */
.section-tag {
    display: inline-block; font-size: 0.75rem; font-weight: 700;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--color-teal); margin-bottom: 12px;
}
.section-tag.center { display: block; text-align: center; }
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.6rem); font-weight: 700;
    color: var(--color-deep); text-align: center; margin-bottom: 48px;
}

/* ---- Intro ---- */
.intro { padding: 100px 0; }
.intro-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 56px; align-items: center;
}
.intro-text h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.4rem); font-weight: 700;
    color: var(--color-deep); margin-bottom: 20px; line-height: 1.2;
}
.intro-text p { color: var(--color-light-text); margin-bottom: 28px; }
.intro-features { display: flex; flex-direction: column; gap: 14px; }
.feature {
    display: flex; align-items: center; gap: 12px;
    font-weight: 500; color: var(--color-text);
}
.feature-icon { font-size: 1.3rem; }
.intro-image {
    border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-card);
}
.intro-image img { width: 100%; height: auto; display: block; }

/* ---- Services ---- */
.services { padding: 100px 0; background: var(--color-surface); }
.services-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.service-card {
    background: var(--color-white); border-radius: var(--radius);
    padding: 32px 28px; box-shadow: var(--shadow-soft);
    transition: transform 0.2s, box-shadow 0.2s;
    border-top: 3px solid transparent;
}
.service-card:hover {
    transform: translateY(-4px); box-shadow: var(--shadow-card);
    border-top-color: var(--color-teal);
}
.service-icon { font-size: 2.2rem; margin-bottom: 16px; }
.service-card h3 {
    font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
    color: var(--color-deep); margin-bottom: 8px;
}
.service-card p { font-size: 0.95rem; color: var(--color-light-text); line-height: 1.65; }
.section-cta { text-align: center; margin-top: 48px; }

/* ---- Quote Band ---- */
.quote-band { background: var(--color-deep); padding: 72px 24px; }
.quote-band-inner { max-width: 800px; margin: 0 auto; text-align: center; }
.quote-band-line {
    width: 48px; height: 3px; background: var(--color-teal);
    margin: 0 auto 32px; border-radius: 2px;
}
.quote-band blockquote {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-style: italic; line-height: 1.55;
    color: var(--color-white); margin-bottom: 20px;
}
.quote-band cite {
    font-size: 0.95rem; color: var(--color-teal-light);
    font-style: normal; font-weight: 500; letter-spacing: 0.04em;
}

/* ---- About ---- */
.about { padding: 100px 0; background: var(--color-surface); }
.about-grid {
    display: grid; grid-template-columns: 1.2fr 0.8fr;
    gap: 48px; align-items: start;
}
.about-content h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.4rem); font-weight: 700;
    color: var(--color-deep); margin-bottom: 20px; line-height: 1.2;
}
.about-content p { color: var(--color-light-text); margin-bottom: 16px; }
.about-list { list-style: none; margin-top: 24px; }
.about-list li { padding: 6px 0; font-weight: 500; }
.about-card {
    background: var(--color-white); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}
.about-card-inner { padding: 36px 32px; }
.about-card h3 {
    font-family: var(--font-display); font-size: 1.25rem; font-weight: 700;
    color: var(--color-deep); margin-bottom: 24px;
}
.about-location { margin-bottom: 18px; }
.about-location strong {
    display: block; font-size: 0.9rem;
    color: var(--color-teal); margin-bottom: 4px;
}
.about-location p { font-size: 0.95rem; color: var(--color-light-text); margin: 0; }

/* ---- Contact ---- */
.contact { padding: 100px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }
.contact-item strong {
    display: block; font-size: 0.9rem; color: var(--color-deep); margin-bottom: 2px;
}
.contact-item a {
    color: var(--color-teal); text-decoration: none; font-weight: 600;
}
.contact-item a:hover { text-decoration: underline; }
.contact-item p { font-size: 0.95rem; color: var(--color-light-text); margin: 0; }
.contact-note {
    background: var(--color-surface); border-radius: var(--radius);
    padding: 16px 20px; margin-top: 8px;
}
.contact-note p { margin: 0; font-size: 0.95rem; }
.contact-form-wrapper {
    background: var(--color-white); border-radius: var(--radius-lg);
    padding: 36px 32px; box-shadow: var(--shadow-card);
}
.contact-form-wrapper h3 {
    font-family: var(--font-display); font-size: 1.3rem; font-weight: 700;
    color: var(--color-deep); margin-bottom: 24px;
}
.form-group { margin-bottom: 16px; }
.form-group input, .form-group textarea {
    width: 100%; padding: 14px 18px;
    border: 2px solid rgba(15,40,64,0.08); border-radius: 8px;
    font-size: 0.95rem; font-family: var(--font-body);
    color: var(--color-text); background: var(--color-bg);
    transition: border-color 0.2s; outline: none;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--color-teal); }
.form-group textarea { resize: vertical; }

/* ---- Footer ---- */
.footer { background: var(--color-slate); color: rgba(255,255,255,0.7); padding: 48px 0; }
.footer-inner { text-align: center; }
.footer-brand {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    font-family: var(--font-display); font-size: 1.1rem; font-weight: 600;
    color: var(--color-white); margin-bottom: 12px;
}
.footer-text { font-size: 0.9rem; margin-bottom: 8px; }
.footer-copy { font-size: 0.8rem; opacity: 0.5; }

/* ---- Back to top ---- */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--color-slate); color: var(--color-white);
    border: none; font-size: 1.4rem; cursor: pointer;
    box-shadow: var(--shadow-card);
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s, transform 0.2s;
    z-index: 999; display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .intro-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .nav-links {
        display: none; position: absolute; top: 72px; left: 0; right: 0;
        background: var(--color-bg); flex-direction: column;
        padding: 24px; gap: 16px;
        border-bottom: 1px solid rgba(15,40,64,0.06); box-shadow: var(--shadow-soft);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .services-grid { grid-template-columns: 1fr; }
    .hero { min-height: 480px; }
    .hero-buttons { flex-direction: column; align-items: center; }
}