/* 4Set Civil Construction – Main Stylesheet
   Path: /assets/css/4set-styles.css
*/

:root {
      --blue:      #1a3a8f;
      --blue-dark: #122970;
      --blue-light:#2550c0;
      --red:       #c0222b;
      --red-dark:  #9c1a21;
      --white:     #ffffff;
      --off-white: #f4f6fb;
      --text-dark: #1a1f2e;
      --text-mid:  #444c63;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.10);
      --shadow-md: 0 4px 20px rgba(0,0,0,0.15);
      --shadow-lg: 0 8px 40px rgba(0,0,0,0.22);
      --transition:0.28s cubic-bezier(0.4,0,0.2,1);
      --font-head: 'Barlow Condensed', sans-serif;
      --font-body: 'Nunito Sans', sans-serif;
      --radius:    6px;
    }

    *, *::before, *::after { box-sizing:border-box; margin:0; padding:0; }
    html { scroll-behavior:smooth; }
    body { font-family:var(--font-body); color:var(--text-dark); background:var(--white); -webkit-font-smoothing:antialiased; }
    a { text-decoration:none; color:inherit; }
    ul { list-style:none; }
    img { display:block; max-width:100%; }
    button { cursor:pointer; border:none; background:none; font-family:inherit; }

    /* ── TOP BAR ── */
    .top-bar {
      background:var(--blue-dark);
      color:rgba(255,255,255,0.85);
      font-size:0.78rem;
      font-weight:600;
      letter-spacing:0.02em;
      padding:7px 16px;
      display:flex;
      align-items:center;
      justify-content:center;
      gap:24px;
      flex-wrap:wrap;
    }
    .top-bar a { color:#ffd700; transition:opacity 0.2s; }
    .top-bar a:hover { opacity:0.8; }
    .top-bar-item { display:flex; align-items:center; gap:6px; }
    .top-bar-item svg { width:13px; height:13px; opacity:0.75; flex-shrink:0; }

    /* ── NAVBAR ── */
    .navbar {
      position:sticky;
      top:0; left:0; right:0;
      z-index:1000;
      background:var(--white);
      box-shadow:var(--shadow-sm);
      transition:box-shadow var(--transition);
    }
    .navbar.scrolled { box-shadow:var(--shadow-md); }
    .nav-inner {
      max-width:1280px;
      margin:0 auto;
      height:76px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      padding:0 24px;
      gap:16px;
    }

    /* Logo */
    .nav-logo { flex-shrink:0; display:flex; align-items:center; }
    .nav-logo img { height:58px; width:auto; border-radius:4px; }

    /* Desktop links */
    .nav-links { display:flex; align-items:center; gap:4px; }
    .nav-item { position:relative; }
    .nav-link {
      display:flex; align-items:center; gap:4px;
      padding:8px 14px;
      font-family:var(--font-body);
      font-size:0.88rem;
      font-weight:700;
      color:var(--blue);
      letter-spacing:0.02em;
      border-radius:var(--radius);
      transition:color var(--transition), background var(--transition);
      white-space:nowrap;
    }
    .nav-link:hover { color:var(--red); background:rgba(192,34,43,0.06); }
    .chevron { width:14px; height:14px; transition:transform var(--transition); flex-shrink:0; }
    .nav-item:hover .chevron { transform:rotate(180deg); }

    /* Dropdown */
    .dropdown {
      position:absolute;
      top:calc(100% + 8px);
      left:50%;
      transform:translateX(-50%) translateY(-6px);
      background:var(--white);
      border-radius:10px;
      box-shadow:var(--shadow-lg);
      border-top:3px solid var(--red);
      min-width:200px;
      padding:8px 0;
      opacity:0;
      pointer-events:none;
      transition:opacity var(--transition), transform var(--transition);
      z-index:100;
    }
    .nav-item:hover .dropdown { opacity:1; pointer-events:auto; transform:translateX(-50%) translateY(0); }
    .dropdown-item a {
      display:flex; align-items:center; gap:10px;
      padding:10px 20px;
      font-size:0.875rem; font-weight:600;
      color:var(--text-mid);
      transition:color var(--transition), background var(--transition), padding-left var(--transition);
    }
    .dropdown-item a:hover { color:var(--red); background:var(--off-white); padding-left:26px; }
    .dot { width:6px; height:6px; border-radius:50%; background:var(--red); flex-shrink:0; opacity:0; transition:opacity var(--transition); }
    .dropdown-item a:hover .dot { opacity:1; }

    /* CTA nav button */
    .nav-cta {
      display:inline-flex; align-items:center; gap:8px;
      padding:10px 18px;
      background:var(--red);
      color:var(--white) !important;
      font-size:0.85rem; font-weight:700;
      border-radius:var(--radius);
      letter-spacing:0.03em;
      transition:background var(--transition), box-shadow var(--transition), transform var(--transition);
      box-shadow:0 2px 8px rgba(192,34,43,0.25);
    }
    .nav-cta:hover { background:var(--red-dark); box-shadow:0 4px 16px rgba(192,34,43,0.35); transform:translateY(-1px); }
    .nav-cta svg { width:15px; height:15px; }

    /* Hamburger */
    .hamburger {
      display:none; flex-direction:column; justify-content:center; align-items:center;
      gap:5px; width:40px; height:40px; border-radius:var(--radius);
      transition:background var(--transition);
    }
    .hamburger:hover { background:var(--off-white); }
    .hamburger span {
      display:block; width:22px; height:2px;
      background:var(--blue); border-radius:2px;
      transition:transform var(--transition), opacity var(--transition), width var(--transition);
    }
    .hamburger.open span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity:0; width:0; }
    .hamburger.open span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

    /* Mobile menu */
    .mobile-menu {
      display:none;
      position:fixed;
      top:0; left:0; right:0;
      background:var(--white);
      box-shadow:var(--shadow-md);
      padding:16px 0 24px;
      max-height:90vh;
      overflow-y:auto;
      z-index:999;
      border-top:2px solid var(--off-white);
      animation:slideDown 0.25s ease;
    }
    @keyframes slideDown { from{opacity:0;transform:translateY(-10px)} to{opacity:1;transform:translateY(0)} }
    .mobile-menu.active { display:block; }
    .mobile-nav-link {
      display:block; padding:13px 24px;
      font-weight:700; font-size:0.95rem; color:var(--blue);
      border-bottom:1px solid rgba(0,0,0,0.05);
      transition:background var(--transition), color var(--transition);
    }
    .mobile-nav-link:hover { background:var(--off-white); color:var(--red); }
    .mobile-group-title {
      padding:14px 24px 6px; font-size:0.75rem; font-weight:700;
      color:var(--red); letter-spacing:0.1em; text-transform:uppercase;
    }
    .mobile-sub-link {
      display:block; padding:10px 24px 10px 36px;
      font-size:0.875rem; font-weight:600; color:var(--text-mid);
      transition:background var(--transition), color var(--transition);
    }
    .mobile-sub-link:hover { background:var(--off-white); color:var(--red); }
    .mobile-cta-wrap { padding:20px 24px 0; }
    .mobile-cta {
      display:block; text-align:center; padding:14px;
      background:var(--red); color:var(--white);
      font-weight:700; border-radius:var(--radius);
      font-size:0.95rem; letter-spacing:0.03em;
      transition:background var(--transition);
    }
    .mobile-cta:hover { background:var(--red-dark); }

    /* ── HERO ── */
    .hero {
      position:relative;
      width:100%; height:100vh;
      min-height:600px; max-height:950px;
      overflow:hidden;
      display:flex; align-items:center; justify-content:center;
    }
    .hero-slides { position:absolute; inset:0; }
    .hero-slide {
      position:absolute; inset:0;
      background-size:cover; background-position:center; background-repeat:no-repeat;
      opacity:0;
      transition:opacity 1.4s ease-in-out;
    }
    .hero-slide.active {
      opacity:1;
      animation:slowZoom 9s ease-in-out forwards;
    }
    @keyframes slowZoom { from{transform:scale(1.05)} to{transform:scale(1.00)} }
    .hero-overlay {
      position:absolute; inset:0;
      background:linear-gradient(to bottom, rgba(10,20,60,0.42) 0%, rgba(10,20,60,0.60) 50%, rgba(5,10,30,0.80) 100%);
      z-index:1;
    }
    .hero-accent-line {
      position:absolute; bottom:0; left:0; width:100%; height:5px;
      background:linear-gradient(90deg, var(--red) 0%, var(--blue-light) 100%);
      z-index:3;
    }
    .hero-content {
      position:relative; z-index:2;
      max-width:860px; padding:0 24px;
      text-align:center;
      animation:heroFadeUp 0.9s ease 0.3s both;
    }
    @keyframes heroFadeUp { from{opacity:0;transform:translateY(28px)} to{opacity:1;transform:translateY(0)} }
    .hero-badge {
      display:inline-flex; align-items:center; gap:8px;
      background:rgba(192,34,43,0.85);
      color:var(--white); font-size:0.75rem; font-weight:700;
      letter-spacing:0.14em; text-transform:uppercase;
      padding:6px 16px; border-radius:999px;
      margin-bottom:20px; backdrop-filter:blur(4px);
    }
    .badge-dot { width:6px; height:6px; border-radius:50%; background:#fff; animation:blink 1.6s infinite; }
    @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
    .hero-headline {
      font-family:var(--font-head);
      font-size:clamp(2.4rem, 6vw, 4.8rem);
      font-weight:900; line-height:1.05;
      color:var(--white); text-transform:uppercase;
      letter-spacing:0.01em; margin-bottom:20px;
      text-shadow:0 2px 20px rgba(0,0,0,0.4);
    }
    .hero-headline .highlight { color:#ffd700; }
    .hero-sub {
      font-size:clamp(0.95rem, 2vw, 1.15rem);
      color:rgba(255,255,255,0.88); line-height:1.7;
      max-width:640px; margin:0 auto 32px;
      text-shadow:0 1px 6px rgba(0,0,0,0.5);
    }
    .hero-ctas { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-bottom:40px; }
    .btn-primary {
      display:inline-flex; align-items:center; gap:10px;
      padding:16px 32px; background:var(--red); color:var(--white);
      font-family:var(--font-body); font-size:0.95rem; font-weight:700;
      border-radius:var(--radius); letter-spacing:0.04em; text-transform:uppercase;
      transition:background var(--transition), box-shadow var(--transition), transform var(--transition);
      box-shadow:0 4px 20px rgba(192,34,43,0.4);
    }
    .btn-primary:hover { background:var(--red-dark); box-shadow:0 6px 28px rgba(192,34,43,0.55); transform:translateY(-2px); }
    .btn-primary svg { width:18px; height:18px; flex-shrink:0; }
    .btn-secondary {
      display:inline-flex; align-items:center; gap:10px;
      padding:15px 30px; background:transparent; color:var(--white);
      font-family:var(--font-body); font-size:0.95rem; font-weight:700;
      border-radius:var(--radius); letter-spacing:0.04em; text-transform:uppercase;
      border:2px solid rgba(255,255,255,0.65);
      transition:border-color var(--transition), background var(--transition), transform var(--transition);
      backdrop-filter:blur(4px);
    }
    .btn-secondary:hover { border-color:var(--white); background:rgba(255,255,255,0.12); transform:translateY(-2px); }
    .btn-secondary svg { width:18px; height:18px; }
    .hero-trust { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }
    .trust-pill {
      display:inline-flex; align-items:center; gap:7px;
      padding:8px 16px;
      background:rgba(255,255,255,0.10);
      border:1px solid rgba(255,255,255,0.2);
      border-radius:999px; color:rgba(255,255,255,0.9);
      font-size:0.8rem; font-weight:600;
      backdrop-filter:blur(6px);
      transition:background var(--transition);
    }
    .trust-pill:hover { background:rgba(255,255,255,0.18); }
    .trust-pill svg { width:14px; height:14px; color:#ffd700; flex-shrink:0; }

    /* Slide controls */
    .hero-indicators {
      position:absolute; bottom:28px; left:50%; transform:translateX(-50%);
      display:flex; gap:8px; z-index:4;
    }
    .indicator {
      width:8px; height:8px; border-radius:999px;
      background:rgba(255,255,255,0.4);
      transition:background var(--transition), width 0.4s ease;
      cursor:pointer; border:none;
    }
    .indicator.active { background:var(--red); width:24px; }
    .hero-arrow {
      position:absolute; top:50%; transform:translateY(-50%);
      z-index:4; width:44px; height:44px; border-radius:50%;
      background:rgba(255,255,255,0.12);
      border:1.5px solid rgba(255,255,255,0.3);
      color:var(--white); display:flex; align-items:center; justify-content:center;
      backdrop-filter:blur(4px);
      transition:background var(--transition), border-color var(--transition);
      cursor:pointer;
    }
    .hero-arrow:hover { background:rgba(192,34,43,0.6); border-color:var(--red); }
    .hero-arrow.prev { left:20px; }
    .hero-arrow.next { right:20px; }
    .hero-arrow svg { width:18px; height:18px; }

    .scroll-hint {
      position:absolute; bottom:52px; right:32px; z-index:4;
      display:flex; flex-direction:column; align-items:center; gap:6px;
      color:rgba(255,255,255,0.55); font-size:0.68rem;
      letter-spacing:0.12em; text-transform:uppercase; font-weight:600;
    }
    .scroll-hint-line {
      width:1.5px; height:32px;
      background:linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
      animation:scrollPulse 1.8s ease-in-out infinite;
    }
    @keyframes scrollPulse { 0%,100%{opacity:0.4} 50%{opacity:1} }

    /* ── RESPONSIVE ── */
    @media (max-width:900px) {
      .nav-links { display:none; }
      .hamburger { display:flex; }
      .top-bar { font-size:0.72rem; gap:12px; }
      .scroll-hint { display:none; }
    }
    @media (max-width:480px) {
      .hero-ctas { flex-direction:column; align-items:center; }
      .btn-primary, .btn-secondary { width:100%; max-width:300px; justify-content:center; }
      .top-bar { display:none; }
      .hero-arrow { display:none; }
    }

    .below-hero {
      padding:80px 24px; text-align:center;
      background:var(--off-white); color:var(--text-mid); font-size:1rem;
    }