/* ==============================
   ARSU Gaz Filtresi - Ana Stil
   ============================== */

:root {
    --primary: #0a1628;
    --primary-light: #132340;
    --secondary: #1a3a6b;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --accent-light: #fef3c7;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --white: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0a1628;
    --card-shadow: 0 4px 20px rgba(10, 22, 40, .08);
    --card-hover-shadow: 0 12px 40px rgba(10, 22, 40, .16);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all .3s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

.fw-800 { font-weight: 800; }

h1, h2, h3, h4, h5, h6 { font-weight: 700; color: var(--primary); }

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

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

/* ---- COLORS ---- */
.text-accent { color: var(--accent) !important; }
.bg-accent { background-color: var(--accent) !important; }
.bg-primary-dark { background-color: var(--primary) !important; }

/* ==============================
   NAVBAR
   ============================== */
#mainNav {
    background: var(--primary);
    border-bottom: 1px solid rgba(255,255,255,.08);
    padding: .75rem 0;
    transition: var(--transition);
    z-index: 1050;
}
#mainNav.scrolled {
    background: rgba(10, 22, 40, .97);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 30px rgba(0,0,0,.3);
}

.brand-icon {
    width: 44px; height: 44px;
    background: linear-gradient(135deg, var(--accent), #ef4444);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem;
    color: white;
    flex-shrink: 0;
}
.brand-icon-sm { width: 36px; height: 36px; font-size: 1rem; border-radius: 8px; }
.brand-name { font-size: 1.25rem; letter-spacing: 2px; color: white; }
.brand-sub { font-size: .6rem; letter-spacing: 3px; color: var(--accent); text-transform: uppercase; }

.navbar-nav .nav-link {
    color: rgba(255,255,255,.8) !important;
    font-weight: 500;
    font-size: .9rem;
    padding: .5rem .85rem !important;
    border-radius: 8px;
    letter-spacing: .3px;
    transition: var(--transition);
}
.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--accent) !important;
    background: rgba(245, 158, 11, .1);
}

.dropdown-menu-dark {
    background: #0f1f35 !important;
    border: 1px solid rgba(255,255,255,.08) !important;
    border-radius: var(--radius-sm) !important;
    overflow: hidden;
}
.dropdown-menu-dark .dropdown-item { color: rgba(255,255,255,.8) !important; font-size: .875rem; padding: .55rem 1rem; }
.dropdown-menu-dark .dropdown-item:hover { background: rgba(245,158,11,.15) !important; color: var(--accent) !important; }

.lang-switcher { display: flex; align-items: center; gap: 6px; }
.lang-btn {
    font-size: .75rem; font-weight: 700;
    color: rgba(255,255,255,.6);
    letter-spacing: 1px;
    transition: var(--transition);
}
.lang-btn.active, .lang-btn:hover { color: var(--accent); text-decoration: none; }

.btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--primary);
    font-weight: 700;
    border-radius: 8px;
    transition: var(--transition);
}
.btn-accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--primary); transform: translateY(-1px); box-shadow: 0 4px 15px rgba(245,158,11,.4); }
.btn-accent-outline { border: 2px solid var(--accent); color: var(--accent); background: transparent; font-weight: 700; border-radius: 8px; transition: var(--transition); }
.btn-accent-outline:hover { background: var(--accent); color: var(--primary); }

/* ==============================
   HERO
   ============================== */
.hero {
    background: linear-gradient(135deg, #050e1a 0%, #0a1628 40%, #0f2a52 70%, #132340 100%);
    min-height: 100vh;
    display: flex; align-items: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(245,158,11,.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(26, 58, 107, .4) 0%, transparent 50%),
        linear-gradient(180deg, transparent 60%, rgba(5,14,26,.6) 100%);
}
.hero-grid-pattern {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
    background-size: 60px 60px;
}
.hero-content { position: relative; z-index: 2; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(245,158,11,.15);
    border: 1px solid rgba(245,158,11,.3);
    color: var(--accent);
    padding: .4rem 1rem;
    border-radius: 99px;
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .5px;
    margin-bottom: 1.5rem;
}
.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 800;
    color: white;
    line-height: 1.2;
    margin-bottom: 1.25rem;
}
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.1rem; color: rgba(255,255,255,.7); max-width: 520px; }

.hero-stats {
    display: flex; gap: 2rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
    font-size: 2rem; font-weight: 800; color: var(--accent);
    line-height: 1;
}
.hero-stat .lbl { font-size: .78rem; color: rgba(255,255,255,.6); margin-top: .2rem; }

.hero-visual {
    position: relative; z-index: 2;
    display: flex; align-items: center; justify-content: center;
}
.hero-card-wrap {
    position: relative;
    width: 100%;
    max-width: 420px;
}
.hero-main-card {
    background: rgba(255,255,255,.06);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}
.hero-main-card::before {
    content: '';
    position: absolute; top: -40px; right: -40px;
    width: 150px; height: 150px;
    background: radial-gradient(circle, rgba(245,158,11,.2) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-icon-big {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 1rem;
}
.hero-floating-badge {
    position: absolute;
    background: var(--accent);
    color: var(--primary);
    font-weight: 700;
    font-size: .75rem;
    padding: .4rem .8rem;
    border-radius: 99px;
    white-space: nowrap;
}
.hero-floating-badge.top { top: -12px; right: 20px; }
.hero-floating-badge.bottom { bottom: -12px; left: 20px; }

/* Pulse animation */
@keyframes pulse-ring {
    0% { transform: scale(1); opacity: .6; }
    100% { transform: scale(1.4); opacity: 0; }
}
.pulse-wrap {
    position: absolute; bottom: 30px; right: -20px;
    width: 60px; height: 60px;
}
.pulse-dot {
    width: 60px; height: 60px;
    background: var(--accent);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--primary);
}
.pulse-ring {
    position: absolute; inset: 0;
    border-radius: 50%;
    border: 2px solid var(--accent);
    animation: pulse-ring 1.8s ease-out infinite;
}

/* ==============================
   SECTION STYLES
   ============================== */
.section-pad { padding: 5rem 0; }
.section-pad-sm { padding: 3rem 0; }

.section-header { margin-bottom: 3rem; }
.section-label {
    display: inline-block;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: .5rem;
}
.section-title {
    font-size: clamp(1.7rem, 3vw, 2.3rem);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: .75rem;
}
.section-title span { color: var(--accent); }
.section-divider {
    width: 50px; height: 4px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 99px;
    margin: 0 auto;
}
.section-divider.left { margin: 0; }

/* ==============================
   PRODUCT CARDS
   ============================== */
.product-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    height: 100%;
    display: flex; flex-direction: column;
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--accent);
}
.product-card-img {
    position: relative;
    overflow: hidden;
    background: var(--bg-light);
    height: 220px;
    display: flex; align-items: center; justify-content: center;
}
.product-card-img img {
    width: 100%; height: 100%;
    object-fit: contain;
    padding: 1rem;
    transition: transform .4s ease;
}
.product-card:hover .product-card-img img { transform: scale(1.05); }
.product-card-img .no-img-icon {
    font-size: 4rem;
    color: var(--border);
}
.product-badge {
    position: absolute; top: 12px; left: 12px;
    background: var(--accent);
    color: var(--primary);
    font-size: .7rem; font-weight: 700;
    padding: .25rem .65rem;
    border-radius: 99px;
    letter-spacing: .5px;
}
.product-card-body {
    padding: 1.4rem;
    flex: 1;
    display: flex; flex-direction: column;
}
.product-cat-tag {
    font-size: .72rem; font-weight: 600; color: var(--accent);
    letter-spacing: 1px; text-transform: uppercase;
    margin-bottom: .4rem;
}
.product-card-body h5 {
    font-size: 1rem; font-weight: 700;
    margin-bottom: .5rem;
    line-height: 1.4;
    color: var(--primary);
}
.product-card-body p { font-size: .875rem; color: var(--text-muted); flex: 1; }
.product-card-footer {
    padding: 1rem 1.4rem;
    border-top: 1px solid var(--border);
    display: flex; justify-content: flex-end;
}
.btn-outline-primary-custom {
    border: 1.5px solid var(--secondary);
    color: var(--secondary);
    font-weight: 600;
    font-size: .85rem;
    padding: .4rem 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    background: transparent;
}
.btn-outline-primary-custom:hover {
    background: var(--secondary);
    color: white;
    transform: translateX(3px);
}

/* ==============================
   FEATURES / WHY US
   ============================== */
.feature-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    height: 100%;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--accent);
}
.feature-icon {
    width: 70px; height: 70px;
    background: linear-gradient(135deg, var(--accent), #f59e0b80);
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem;
    color: var(--primary);
    margin: 0 auto 1.25rem;
    transition: var(--transition);
}
.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}
.feature-card h5 { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; }
.feature-card p { font-size: .875rem; color: var(--text-muted); margin: 0; }

/* ==============================
   STATS BAR
   ============================== */
.stats-section {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}
.stats-section::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 50% 100%, rgba(245,158,11,.1) 0%, transparent 60%);
}
.stat-item { text-align: center; position: relative; z-index: 1; }
.stat-item .num {
    font-size: 2.5rem; font-weight: 800;
    background: linear-gradient(135deg, #fff, var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}
.stat-item .unit { font-size: 1.4rem; }
.stat-item .lbl { font-size: .85rem; color: rgba(255,255,255,.7); margin-top: .4rem; }

/* ==============================
   CATEGORIES SECTION
   ============================== */
.category-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    display: block;
    color: inherit;
}
.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--accent);
    color: inherit;
}
.cat-icon-wrap {
    height: 130px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex; align-items: center; justify-content: center;
    font-size: 3rem; color: var(--accent);
    transition: var(--transition);
}
.category-card:hover .cat-icon-wrap { background: linear-gradient(135deg, var(--secondary), var(--primary)); }
.cat-body { padding: 1.2rem; }
.cat-body h6 { font-weight: 700; font-size: .95rem; margin-bottom: .35rem; }
.cat-body p { font-size: .8rem; color: var(--text-muted); margin: 0; }

/* ==============================
   CTA SECTION
   ============================== */
.cta-section {
    background: linear-gradient(135deg, var(--accent), #d97706);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: '';
    position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23000' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='20'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-section h2 { color: var(--primary); font-weight: 800; }
.cta-section p { color: rgba(10,22,40,.7); }
.btn-dark-custom {
    background: var(--primary);
    color: white;
    font-weight: 700;
    border-radius: 10px;
    padding: .75rem 2rem;
    transition: var(--transition);
    border: none;
}
.btn-dark-custom:hover { background: var(--primary-light); color: white; transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,0,0,.25); }

/* ==============================
   BREADCRUMB
   ============================== */
.page-hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 3.5rem 0 2.5rem;
    position: relative;
    overflow: hidden;
}
.page-hero::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0;
    height: 40px;
    background: white;
    clip-path: ellipse(55% 55% at 50% 100%);
}
.page-hero h1 { color: white; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.breadcrumb-custom .breadcrumb-item a { color: rgba(255,255,255,.7); }
.breadcrumb-custom .breadcrumb-item.active { color: var(--accent); }
.breadcrumb-custom .breadcrumb-item + .breadcrumb-item::before { color: rgba(255,255,255,.4); }

/* ==============================
   PRODUCT DETAIL
   ============================== */
.product-detail-img-wrap {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 2.5rem;
    display: flex; align-items: center; justify-content: center;
    min-height: 380px;
    border: 1px solid var(--border);
}
.product-detail-img-wrap img { max-height: 320px; object-fit: contain; }
.spec-list { list-style: none; padding: 0; margin: 0; }
.spec-list li {
    display: flex; align-items: flex-start; gap: .6rem;
    padding: .6rem 0;
    border-bottom: 1px solid var(--border);
    font-size: .9rem;
}
.spec-list li:last-child { border-bottom: none; }
.spec-list li::before {
    content: '▸';
    color: var(--accent);
    font-size: .8rem;
    margin-top: 3px;
    flex-shrink: 0;
}
.inquiry-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius);
    padding: 1.75rem;
    color: white;
}
.inquiry-card h5 { color: var(--accent); }

/* ==============================
   CONTACT
   ============================== */
.contact-info-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius);
    padding: 2rem;
    color: white;
    height: 100%;
}
.contact-info-item {
    display: flex; align-items: flex-start; gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,.1);
}
.contact-info-item:last-child { border-bottom: none; }
.contact-icon {
    width: 44px; height: 44px;
    background: rgba(245,158,11,.2);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: var(--accent); font-size: 1.1rem;
    flex-shrink: 0;
}
.contact-form-card {
    background: white;
    border-radius: var(--radius);
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
}
.form-label { font-weight: 600; font-size: .875rem; color: var(--text); margin-bottom: .4rem; }
.form-control, .form-select {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .9rem;
    padding: .65rem 1rem;
    transition: var(--transition);
}
.form-control:focus, .form-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(245,158,11,.15);
    outline: none;
}

/* ==============================
   FOOTER
   ============================== */
.footer { background: var(--bg-dark); }
.footer-top { padding: 4rem 0 2rem; border-bottom: 1px solid rgba(255,255,255,.06); }
.footer-bottom { padding: 1.25rem 0; }
.footer-heading {
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.25rem;
}
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: .5rem; }
.footer-links a { color: rgba(255,255,255,.6); font-size: .875rem; transition: var(--transition); display: inline-flex; align-items: center; gap: .3rem; }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact-list { list-style: none; padding: 0; }
.footer-contact-list li { display: flex; align-items: flex-start; gap: .7rem; font-size: .875rem; color: rgba(255,255,255,.6); margin-bottom: .85rem; }
.footer-contact-list li i { margin-top: 2px; flex-shrink: 0; }
.footer-contact-list a { color: rgba(255,255,255,.6); }
.footer-contact-list a:hover { color: var(--accent); }
.social-link {
    width: 38px; height: 38px;
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.1);
    color: rgba(255,255,255,.6);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
}
.social-link:hover { background: var(--accent); border-color: var(--accent); color: var(--primary); }

/* ==============================
   SCROLL TO TOP
   ============================== */
.scroll-top-btn {
    position: fixed; right: 1.5rem; bottom: 1.5rem;
    width: 46px; height: 46px;
    background: var(--accent);
    color: var(--primary);
    border: none;
    border-radius: 12px;
    font-size: 1.4rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(245,158,11,.4);
    cursor: pointer;
    opacity: 0; pointer-events: none;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
}
.scroll-top-btn.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.scroll-top-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(245,158,11,.5); }

/* ==============================
   FILTER BAR (Products page)
   ============================== */
.filter-bar {
    background: white;
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}
.filter-btn {
    padding: .45rem 1.1rem;
    border-radius: 99px;
    border: 1.5px solid var(--border);
    background: white;
    color: var(--text);
    font-size: .85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--primary);
    font-weight: 700;
}

/* ==============================
   EMPTY STATE
   ============================== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}
.empty-state i { font-size: 4rem; color: var(--border); display: block; margin-bottom: 1rem; }

/* ==============================
   ANIMATIONS
   ============================== */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .6s ease forwards; }
.fade-up-1 { animation-delay: .1s; opacity: 0; }
.fade-up-2 { animation-delay: .2s; opacity: 0; }
.fade-up-3 { animation-delay: .3s; opacity: 0; }
.fade-up-4 { animation-delay: .4s; opacity: 0; }

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 991.98px) {
    .hero { min-height: auto; padding: 6rem 0 4rem; }
    .hero-visual { margin-top: 3rem; }
    .hero-stats { gap: 1.25rem; }
}
@media (max-width: 767.98px) {
    .section-pad { padding: 3.5rem 0; }
    .hero h1 { font-size: 1.9rem; }
    .stat-item .num { font-size: 2rem; }
}

/* ==============================
   ABOUT PAGE
   ============================== */
.about-img-wrap {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
}
.about-img-wrap img { border-radius: var(--radius); }
.about-exp-badge {
    position: absolute; right: -15px; bottom: 25px;
    background: var(--accent);
    color: var(--primary);
    padding: 1rem 1.5rem;
    border-radius: 14px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(245,158,11,.4);
}
.about-exp-badge .num { font-size: 2.5rem; font-weight: 900; line-height: 1; }
.about-exp-badge .txt { font-size: .75rem; font-weight: 700; line-height: 1.3; }