/* ==========================================================
   LUXSYSTECH — Modern Minimalist One-Page
   Palette: Navy #0c2340 · Slate #64748b · Accent #0ea5e9 · White
   ========================================================== */

/* ---------- Variables ---------- */
:root {
    --navy: #0c2340;
    --navy-light: #163a5f;
    --navy-900: #091a30;
    --slate-800: #1e293b;
    --slate-600: #475569;
    --slate-400: #94a3b8;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50: #f8fafc;
    --accent: #0ea5e9;
    --accent-dark: #0284c7;
    --accent-light: #e0f2fe;
    --white: #ffffff;
    --green: #10b981;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow-sm: 0 1px 3px rgba(12, 35, 64, 0.06);
    --shadow: 0 4px 20px rgba(12, 35, 64, 0.07);
    --shadow-lg: 0 12px 40px rgba(12, 35, 64, 0.1);
    --shadow-accent: 0 8px 30px rgba(14, 165, 233, 0.25);
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--slate-800); line-height: 1.65; background: var(--white); overflow-x: hidden; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    line-height: 1.2;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
}
.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

.btn-ghost {
    background: transparent;
    color: rgba(255,255,255,0.9);
    border-color: rgba(255,255,255,0.3);
}
.btn-ghost:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.5);
    color: var(--white);
}

.btn-full { width: 100%; justify-content: center; }

/* ===========================
   NAVIGATION
   =========================== */
#navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 18px 0;
    transition: var(--transition);
}
#navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 10px 0;
    box-shadow: 0 1px 12px rgba(12,35,64,0.06);
}

.nav-container {
    max-width: 1120px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
}

.logo {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 1.35rem; font-weight: 800; color: var(--white);
    letter-spacing: -0.3px;
}
.logo span { color: var(--accent); }
.logo-icon { width: 28px; height: 28px; }
#navbar.scrolled .logo { color: var(--navy); }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
    padding: 8px 14px; border-radius: var(--radius-xs);
    font-weight: 500; font-size: 0.9rem;
    color: rgba(255,255,255,0.8); transition: var(--transition);
}
.nav-links a:hover { color: var(--white); background: rgba(255,255,255,0.1); }

.nav-cta {
    background: var(--accent) !important; color: var(--white) !important;
    border-radius: var(--radius-sm) !important; padding: 8px 20px !important;
    margin-left: 8px;
}
.nav-cta:hover { background: var(--accent-dark) !important; }

#navbar.scrolled .nav-links a { color: var(--slate-600); }
#navbar.scrolled .nav-links a:hover { color: var(--navy); background: var(--slate-100); }
#navbar.scrolled .nav-cta { color: var(--white) !important; background: var(--accent) !important; }
#navbar.scrolled .nav-cta:hover { background: var(--accent-dark) !important; }

/* Hamburger */
.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
    width: 22px; height: 2px; background: var(--white);
    border-radius: 2px; transition: var(--transition);
}
#navbar.scrolled .nav-toggle span { background: var(--slate-800); }

/* ===========================
   HERO
   =========================== */
#hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(160deg, var(--navy-900) 0%, var(--navy) 40%, var(--navy-light) 100%);
    position: relative; overflow: hidden;
}

.hero-bg-shape {
    position: absolute; width: 600px; height: 600px;
    border-radius: 50%; pointer-events: none;
    background: radial-gradient(circle, rgba(14,165,233,0.12) 0%, transparent 70%);
    top: -15%; right: -10%;
}
.hero-bg-shape--2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(14,165,233,0.08) 0%, transparent 70%);
    top: auto; bottom: -10%; right: auto; left: -5%;
}

.hero-grid {
    display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px;
    align-items: center; position: relative; z-index: 1;
    padding-top: 80px; padding-bottom: 40px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px; border-radius: 100px;
    background: rgba(14,165,233,0.15); color: var(--accent);
    font-size: 0.8rem; font-weight: 600; letter-spacing: 0.5px;
    margin-bottom: 20px; text-transform: uppercase;
}

.hero-content h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 800; color: var(--white);
    line-height: 1.15; margin-bottom: 18px; letter-spacing: -1px;
}

.hero-content p {
    font-size: 1.1rem; color: rgba(255,255,255,0.7);
    max-width: 520px; margin-bottom: 32px; line-height: 1.7;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero visual floating cards */
.hero-visual {
    position: relative; height: 340px;
}

.hero-card {
    position: absolute; display: flex; align-items: center; gap: 10px;
    padding: 14px 22px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--white); font-weight: 600; font-size: 0.9rem;
    animation: heroFloat 6s ease-in-out infinite;
}
.hero-card svg { color: var(--accent); }

.hero-card--1 { top: 20%; left: 10%; animation-delay: 0s; }
.hero-card--2 { top: 48%; right: 5%; animation-delay: -2s; }
.hero-card--3 { bottom: 10%; left: 25%; animation-delay: -4s; }

@keyframes heroFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* Scroll hint */
.hero-scroll-hint {
    position: absolute; bottom: 32px; left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.35);
    animation: scrollBounce 2s ease-in-out infinite;
}
@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===========================
   SECTION HEADERS
   =========================== */
.section-header { text-align: center; max-width: 560px; margin: 0 auto 56px; }
.section-tag {
    display: inline-block;
    font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1.5px; color: var(--accent);
    margin-bottom: 12px;
}
.section-header h2 {
    font-size: 2rem; font-weight: 800; color: var(--navy);
    letter-spacing: -0.5px; margin-bottom: 12px;
}
.section-header p { color: var(--slate-600); font-size: 1.05rem; }

/* ===========================
   SERVICES
   =========================== */
#services { padding: 100px 0; background: var(--white); }

.services-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}

.service-card {
    background: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius);
    padding: 36px 32px;
    position: relative; overflow: hidden;
    transition: var(--transition);
}
.service-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-number {
    position: absolute; top: 20px; right: 24px;
    font-size: 3rem; font-weight: 900; line-height: 1;
    color: var(--slate-100); pointer-events: none;
    transition: var(--transition);
}
.service-card:hover .service-number { color: var(--accent-light); }

.service-icon {
    width: 48px; height: 48px;
    background: var(--accent-light);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px;
}
.service-icon svg { width: 24px; height: 24px; color: var(--accent-dark); }

.service-card h3 {
    font-size: 1.1rem; font-weight: 700; color: var(--navy);
    margin-bottom: 10px;
}
.service-card > p {
    color: var(--slate-600); font-size: 0.93rem; line-height: 1.65; margin-bottom: 18px;
}

.service-tags {
    display: flex; flex-wrap: wrap; gap: 8px;
}
.service-tags li {
    padding: 4px 12px; border-radius: 100px;
    font-size: 0.78rem; font-weight: 600;
    background: var(--slate-100); color: var(--slate-600);
    transition: var(--transition);
}
.service-card:hover .service-tags li {
    background: var(--accent-light); color: var(--accent-dark);
}

/* ===========================
   WHY US
   =========================== */
#why { padding: 100px 0; background: var(--slate-50); }

.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.why-card {
    text-align: center; padding: 36px 20px;
    border-radius: var(--radius);
    background: var(--white);
    border: 1px solid var(--slate-200);
    transition: var(--transition);
}
.why-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-4px);
}

.why-icon-wrap {
    width: 48px; height: 48px; margin: 0 auto 16px;
    background: var(--accent-light); border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
}
.why-icon-wrap svg { width: 22px; height: 22px; color: var(--accent-dark); }

.why-number {
    font-size: 2rem; font-weight: 800; color: var(--navy);
    margin-bottom: 4px;
}

.why-card h3 {
    font-size: 0.95rem; font-weight: 700; color: var(--navy); margin-bottom: 10px;
}
.why-card p {
    font-size: 0.88rem; color: var(--slate-600); line-height: 1.6;
}

/* ===========================
   ABOUT
   =========================== */
#about { padding: 100px 0; background: var(--white); }

.about-layout {
    display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: center;
}

.about-content .section-tag { margin-bottom: 10px; }
.about-content h2 {
    font-size: 2rem; font-weight: 800; color: var(--navy);
    margin-bottom: 20px; letter-spacing: -0.5px;
}
.about-lead {
    font-size: 1.08rem; color: var(--slate-800); font-weight: 500;
    margin-bottom: 12px;
}
.about-content > p { color: var(--slate-600); margin-bottom: 12px; }

.about-values {
    display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px;
}
.value {
    display: flex; align-items: center; gap: 10px;
    font-weight: 600; font-size: 0.9rem; color: var(--navy);
}
.value svg { width: 18px; height: 18px; color: var(--green); flex-shrink: 0; }

.about-mission-card {
    background: linear-gradient(145deg, var(--navy), var(--navy-light));
    color: var(--white);
    border-radius: var(--radius);
    padding: 40px 36px;
}
.mission-block h4 {
    font-size: 1rem; font-weight: 700; margin-bottom: 8px;
    color: var(--accent);
}
.mission-block p { font-size: 0.95rem; opacity: 0.85; line-height: 1.65; }
.mission-divider {
    width: 40px; height: 2px;
    background: rgba(255,255,255,0.2); margin: 24px 0;
}

/* ===========================
   CONTACT
   =========================== */
#contact { padding: 100px 0; background: var(--slate-50); }

.contact-layout {
    display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; align-items: start;
}

.contact-card {
    background: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius);
    padding: 32px;
    display: flex; flex-direction: column; gap: 28px;
}

.contact-item { display: flex; gap: 14px; align-items: flex-start; }
.contact-icon {
    width: 40px; height: 40px; flex-shrink: 0;
    background: var(--accent-light); border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
}
.contact-icon svg { width: 20px; height: 20px; color: var(--accent-dark); }
.contact-item strong { display: block; font-size: 0.9rem; color: var(--navy); margin-bottom: 2px; }
.contact-item p { font-size: 0.9rem; color: var(--slate-600); }

.contact-form {
    background: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius);
    padding: 36px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block; font-weight: 600; font-size: 0.85rem;
    color: var(--navy); margin-bottom: 6px;
}
.required { color: var(--accent); }

.form-group input,
.form-group textarea {
    width: 100%; padding: 12px 16px;
    border: 1.5px solid var(--slate-200); border-radius: var(--radius-xs);
    font-size: 0.93rem; font-family: var(--font);
    background: var(--slate-50); color: var(--slate-800);
    transition: var(--transition);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--slate-400); }
.form-group input:focus,
.form-group textarea:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(14,165,233,0.12);
    background: var(--white);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.contact-form .btn-primary {
    margin-top: 4px;
}

/* Form success */
.form-success {
    display: none; align-items: center; gap: 10px;
    margin-top: 16px; padding: 14px 18px;
    background: #ecfdf5; border: 1px solid #a7f3d0; border-radius: var(--radius-xs);
    color: #065f46; font-size: 0.9rem; font-weight: 500;
}
.form-success svg { color: var(--green); flex-shrink: 0; }
.form-success.show { display: flex; }

/* ===========================
   FOOTER
   =========================== */
#footer {
    background: var(--navy-900); color: rgba(255,255,255,0.6);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px; padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-brand .logo { margin-bottom: 14px; display: inline-flex; }
.footer-brand p { font-size: 0.9rem; line-height: 1.6; max-width: 280px; }

.footer-col h4 {
    color: var(--white); font-size: 0.9rem; font-weight: 700;
    margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.5px;
}
.footer-col a {
    display: block; padding: 3px 0; font-size: 0.88rem;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 3px; }

.footer-bottom {
    padding: 24px 0; text-align: center; font-size: 0.82rem;
}

/* ===========================
   ANIMATIONS
   =========================== */
.reveal {
    opacity: 0; transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1; transform: translateY(0);
}

/* Stagger children */
.reveal-stagger > * {
    opacity: 0; transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger.visible > * { opacity: 1; transform: translateY(0); }

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-content p { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .hero-visual { display: none; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .about-layout { grid-template-columns: 1fr; gap: 36px; }
    .contact-layout { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}

@media (max-width: 640px) {
    .nav-toggle { display: flex; }
    .nav-links {
        position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
        background: var(--navy-900); flex-direction: column;
        padding: 80px 28px 28px; gap: 4px;
        transition: var(--transition);
        box-shadow: -8px 0 30px rgba(0,0,0,0.3);
        z-index: 999;
    }
    .nav-links.open { right: 0; }
    .nav-links a {
        color: rgba(255,255,255,0.8) !important;
        padding: 12px 14px !important; font-size: 1rem !important;
        margin-left: 0 !important;
    }
    .nav-links a:hover { background: rgba(255,255,255,0.06) !important; color: var(--white) !important; }
    .nav-cta { margin-top: 8px; text-align: center; }

    .services-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .about-values { grid-template-columns: 1fr; }

    .section-header h2 { font-size: 1.6rem; }
    .hero-content h1 { font-size: 1.9rem; }
    #services, #why, #about, #contact { padding: 72px 0; }
}