/* ============================================================
   Art Alüminyum — AluK Kurumsal Tema
   AluK referans tasarımı | Yetkili Bayi
   ============================================================ */

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

:root {
    --red:     #E3000F;
    --red-dk:  #B3000A;
    --dark:    #1A1A1A;
    --mid:     #4A4A4A;
    --muted:   #888;
    --border:  #E0E0E0;
    --bg:      #F8F9FA;
    --white:   #ffffff;
    --shadow:  0 4px 20px rgba(0,0,0,.07);
    --font:    'Segoe UI', system-ui, -apple-system, sans-serif;
    --nav-h:   96px;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--dark); background: var(--white); line-height: 1.6; }
img  { display: block; max-width: 100%; }
a    { text-decoration: none; color: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.sr-only   { position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0); }

/* ============================================================
   NAV — Beyaz, 3px kırmızı alt çizgi
   ============================================================ */
.site-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 900;
    height: var(--nav-h);
    background: var(--white);
    border-bottom: 3px solid var(--red);
    box-shadow: 0 1px 8px rgba(0,0,0,.06);
    display: flex; align-items: center;
}
.site-nav .container {
    display: flex; align-items: center; justify-content: space-between; width: 100%;
}

.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo-icon {
    width: 36px; height: 36px; background: var(--dark);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.nav-logo-icon svg { width: 20px; height: 20px; fill: #fff; }
.nav-brand { font-size: 15px; font-weight: 700; letter-spacing: .06em; color: var(--dark); text-transform: uppercase; }
.nav-brand span { color: var(--red); }

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
    font-size: 12px; color: var(--muted);
    font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
    padding-bottom: 3px;
    border-bottom: 2px solid transparent;
    transition: color .2s, border-color .2s;
}
.nav-links a:hover { color: var(--dark); }
.nav-links a.active { color: var(--dark); border-bottom-color: var(--red); }

/* ALUK pill — logo + etiket */
.aluk-pill {
    display: inline-flex; align-items: center; gap: 10px;
    background: var(--white);
    border: 1px solid var(--border);
    border-top: 2.5px solid var(--red);
    border-bottom: none !important;
    padding: 6px 14px 7px;
    transition: border-color .2s, box-shadow .2s;
    white-space: nowrap;
}
.aluk-pill:hover {
    border-color: var(--red) !important;
    box-shadow: 0 2px 8px rgba(227,0,15,.12);
}
.aluk-pill-logo { display: block; height: 34px; width: auto; }
.aluk-pill-sep  { width: 1px; height: 20px; background: var(--border); flex-shrink: 0; }
.aluk-pill-label {
    font-size: 9px; font-weight: 700; color: var(--muted);
    text-transform: uppercase; letter-spacing: .12em;
}

/* Hamburger */
.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(--dark); transition: all .3s;
}

/* Mobile nav */
.mobile-nav {
    display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 800;
    background: var(--dark); border-top: 3px solid var(--red);
    padding: 8px 32px 28px;
    max-height: calc(100dvh - var(--nav-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
    display: block; padding: 14px 0; font-size: 13px; font-weight: 600;
    color: #aaa; border-bottom: 1px solid #2a2a2a; text-transform: uppercase;
    letter-spacing: .06em; transition: color .2s;
}
.mobile-nav a:hover { color: var(--red); }
.mobile-nav a:last-child { border-bottom: none; }

/* ============================================================
   PAGE HERO — İç sayfa başlık bandı
   ============================================================ */
.page-hero {
    margin-top: var(--nav-h);
    background-color: var(--dark);
    color: #fff;
    padding: 56px 0;
    border-bottom: 3px solid var(--red);
}
.page-hero-eyebrow {
    color: var(--red);
    font-weight: 700; text-transform: uppercase;
    letter-spacing: 3px; margin-bottom: 10px; font-size: 0.78rem;
}
.page-hero h1 {
    margin: 0; font-weight: 300; text-transform: uppercase;
    letter-spacing: 2px; font-size: clamp(22px, 4vw, 34px);
    line-height: 1.15;
}
.breadcrumb {
    display: flex; gap: 4px; align-items: center;
    margin-top: 16px; font-size: 0.83rem; color: #666;
}
.breadcrumb a { color: #777; transition: color .2s; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { color: #444; margin: 0 4px; }
.breadcrumb .current { color: var(--red); }

/* ============================================================
   HERO (Ana Sayfa Slider)
   ============================================================ */
.hero {
    margin-top: var(--nav-h);
    position: relative; overflow: hidden;
    min-height: calc(100vh - var(--nav-h));
    display: flex; align-items: flex-end;
    background: var(--dark);
}
.hero-slides { position: absolute; inset: 0; }
.hero-slide {
    position: absolute; inset: 0;
    background-size: cover; background-position: center;
    opacity: 0; transition: opacity 1.2s ease;
}
.hero-slide.active { opacity: 1; }
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(26,26,26,.88) 0%, rgba(26,26,26,.12) 100%);
}
.hero-content {
    position: relative; z-index: 2;
    padding: 64px 0 72px; color: #fff; width: 100%;
}
.hero-content .container {
    display: flex; justify-content: space-between; align-items: flex-end; gap: 40px;
}
.hero-text { max-width: 580px; }

.hero-eyebrow {
    display: inline-block; background: var(--red); color: #fff;
    font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
    font-weight: 700; padding: 5px 14px; margin-bottom: 22px;
}
.hero-title {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 300; line-height: 1.1; margin-bottom: 18px; letter-spacing: .5px;
}
.hero-title strong { font-weight: 800; }
.hero-subtitle {
    font-size: 15px; color: rgba(255,255,255,.72);
    max-width: 460px; line-height: 1.75; margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Butonlar */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 28px; font-size: 12px; font-weight: 700;
    letter-spacing: .08em; text-transform: uppercase;
    transition: all .2s; cursor: pointer; border-radius: 0;
}
.btn-primary { background: var(--red); color: #fff; border: 2px solid var(--red); }
.btn-primary:hover { background: var(--red-dk); border-color: var(--red-dk); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.45); }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-dark { background: var(--dark); color: #fff; border: 2px solid var(--dark); }
.btn-dark:hover { background: #333; border-color: #333; }

/* Hero stats */
.hero-stats {
    display: flex; gap: 40px; flex-shrink: 0;
    border-left: 3px solid var(--red);
    padding: 20px 28px; background: rgba(0,0,0,.5);
}
.hero-stat-num { font-size: 30px; font-weight: 700; line-height: 1; color: #fff; }
.hero-stat-num.accent { color: var(--red); }
.hero-stat-lbl { font-size: 10px; color: #999; text-transform: uppercase; letter-spacing: .1em; margin-top: 4px; }

/* Slider dots */
.hero-dots {
    position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 6px; z-index: 3;
}
.hero-dot {
    width: 32px; height: 3px; background: rgba(255,255,255,.3);
    border: none; cursor: pointer; transition: all .3s; padding: 0;
}
.hero-dot.active { background: var(--red); width: 44px; }

/* ============================================================
   SECTION
   ============================================================ */
.section { padding: 80px 0; }
.section-gray  { background: var(--bg); }
.section-white { background: var(--white); }

.section-header { margin-bottom: 44px; }
.section-header-row {
    display: flex; justify-content: space-between; align-items: flex-end;
    border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 44px;
}
.section-eyebrow {
    display: block; font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
    color: var(--red); font-weight: 700; margin-bottom: 10px;
}
.section-title {
    font-size: clamp(22px, 3.5vw, 32px); font-weight: 700;
    color: var(--dark); line-height: 1.2; margin-bottom: 14px;
}
.section-title.light { font-weight: 300; }
.section-sub { font-size: 16px; color: var(--mid); line-height: 1.75; }
.link-more {
    font-size: 11px; font-weight: 700; color: var(--red);
    text-transform: uppercase; letter-spacing: .08em;
    border-bottom: 1px solid var(--red); padding-bottom: 2px;
    white-space: nowrap; transition: opacity .2s;
}
.link-more:hover { opacity: .65; }

/* ============================================================
   ALUK BAND — Tam genişlik beyaz şerit
   ============================================================ */
.aluk-band {
    background: var(--white);
    border-top: 3px solid var(--red);
    border-bottom: 1px solid var(--border);
    padding: 64px 0;
}
.aluk-inner {
    display: flex; align-items: center; gap: 0; flex-wrap: wrap;
}

/* Logo bloğu — saf beyaz, logo doğal renkleri */
.aluk-logo-section {
    flex-shrink: 0;
    display: flex; flex-direction: column; align-items: flex-start;
    padding-right: 56px;
}
.aluk-logo-section img { display: block; }
.aluk-partner-badge {
    display: inline-block; margin-top: 12px;
    background: var(--red); color: #fff;
    font-size: 10px; font-weight: 700;
    letter-spacing: .14em; text-transform: uppercase;
    padding: 4px 12px;
}

/* Dikey ayırıcı çizgi */
.aluk-divider-v {
    width: 1px; background: var(--border);
    align-self: stretch; flex-shrink: 0;
    margin: 0; min-height: 120px;
}

/* Metin bloğu */
.aluk-text {
    flex: 1; min-width: 260px; padding-left: 56px;
}
.aluk-text h3 {
    font-size: clamp(18px, 2.5vw, 24px); font-weight: 300;
    color: var(--dark); margin-bottom: 14px; letter-spacing: .3px; line-height: 1.3;
}
.aluk-text p { font-size: 15px; color: var(--mid); line-height: 1.8; max-width: 600px; }
.aluk-text .btn { margin-top: 28px; display: inline-flex; }

/* ============================================================
   PROJELER
   ============================================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 24px;
}
.project-card {
    display: block; background: var(--white); text-decoration: none;
    border-bottom: 3px solid transparent;
    box-shadow: 0 2px 8px rgba(0,0,0,.06);
    transition: all .3s ease;
}
.project-card:hover {
    transform: translateY(-4px);
    border-bottom-color: var(--red);
    box-shadow: 0 12px 28px rgba(0,0,0,.1);
}
.project-thumb {
    position: relative; overflow: hidden;
    aspect-ratio: 4/3; background: var(--bg);
}
.project-thumb img {
    width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease;
}
.project-card:hover .project-thumb img { transform: scale(1.05); }
.project-tag {
    position: absolute; bottom: 0; left: 0;
    background: var(--dark); color: #fff;
    font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
    padding: 5px 12px;
}
.project-info { padding: 18px 20px 20px; }
.project-name { font-size: 14px; font-weight: 700; margin-bottom: 5px; color: var(--dark); }
.project-meta { font-size: 12px; color: var(--muted); }

/* Filtre */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn {
    padding: 8px 20px; border: 1px solid var(--border);
    background: var(--white); font-size: 11px; font-weight: 700;
    color: var(--mid); cursor: pointer; text-transform: uppercase;
    letter-spacing: .06em; transition: all .2s;
}
.filter-btn:hover  { border-color: var(--dark); color: var(--dark); }
.filter-btn.active { background: var(--red); color: #fff; border-color: var(--red); }

/* ============================================================
   PROJE DETAY
   ============================================================ */
.project-features {
    display: flex; margin-bottom: 40px;
    border: 1px solid var(--border); border-top: 3px solid var(--dark);
    overflow: hidden;
}
.feature-item { flex: 1; padding: 20px 24px; border-right: 1px solid var(--border); }
.feature-item:last-child { border-right: none; }
.feature-label {
    font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
    color: var(--red); margin-bottom: 6px; font-weight: 700;
}
.feature-val { font-size: 14px; font-weight: 600; color: var(--dark); }

.detail-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.gallery-item { overflow: hidden; aspect-ratio: 4/3; cursor: pointer; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s; }
.gallery-item:hover img { transform: scale(1.05); }

/* Lightbox */
.lightbox-overlay {
    display: none; position: fixed; inset: 0; z-index: 9000;
    background: rgba(0,0,0,.94); align-items: center; justify-content: center;
}
.lightbox-overlay.open { display: flex; }
.lightbox-img { max-width: 90vw; max-height: 88vh; object-fit: contain; }
.lightbox-close {
    position: absolute; top: 20px; right: 24px; color: #fff; font-size: 28px;
    cursor: pointer; background: none; border: none; line-height: 1;
    opacity: .6; transition: opacity .2s;
}
.lightbox-close:hover { opacity: 1; }
.lightbox-nav {
    position: absolute; top: 50%; transform: translateY(-50%); color: #fff;
    font-size: 40px; background: none; border: none; cursor: pointer;
    opacity: .5; transition: opacity .2s;
}
.lightbox-nav:hover { opacity: 1; }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* ============================================================
   HAKKIMIZDA
   ============================================================ */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 36px; background: var(--border); }
.stat-card { background: var(--bg); padding: 24px 20px; }
.stat-num { font-size: 2rem; font-weight: 900; line-height: 1; color: var(--red); }
.stat-num.dark { color: var(--dark); }
.stat-lbl { font-size: 11px; color: var(--mid); margin-top: 5px; text-transform: uppercase; letter-spacing: .08em; font-weight: 600; }
.about-img { }
.about-img img { width: 100%; object-fit: contain; background: var(--bg); padding: 40px; border: 1px solid var(--border); }

/* Sol kırmızı çizgili içerik kutusu */
.content-box {
    border-left: 3px solid var(--red); padding: 20px 24px;
    background: var(--bg); margin-bottom: 32px;
}

/* Ana sayfa özet kutusu */
.intro-box {
    background: var(--white); padding: 56px;
    border-top: 3px solid var(--red);
    box-shadow: 0 8px 32px rgba(0,0,0,.06);
    text-align: center; max-width: 840px; margin: 0 auto;
}

/* ============================================================
   İLETİŞİM
   ============================================================ */
.contact-grid { display: flex; flex-wrap: wrap; gap: 32px; }
.contact-info {
    flex: 1; min-width: 260px;
    background: var(--white); padding: 40px;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--red);
}
.contact-info h3 {
    font-size: 13px; font-weight: 700; text-transform: uppercase;
    letter-spacing: .12em; color: var(--dark);
    margin-bottom: 28px; padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.contact-item { margin-bottom: 24px; }
.contact-lbl { font-size: 10px; font-weight: 700; color: var(--red); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 5px; }
.contact-val { font-size: 15px; font-weight: 500; color: var(--dark); }
.contact-val a { color: var(--dark); transition: color .2s; }
.contact-val a:hover { color: var(--red); }

.contact-form-box {
    flex: 2; min-width: 300px;
    background: var(--white); padding: 40px;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--dark);
}
.contact-form-box h3 {
    font-size: 13px; font-weight: 700; text-transform: uppercase;
    letter-spacing: .12em; color: var(--dark); margin-bottom: 28px;
}
.form-row { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.form-field { flex: 1; min-width: 180px; }
.form-group { margin-bottom: 14px; }
.form-group label, .form-field label {
    display: block; font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: .07em; color: var(--dark); margin-bottom: 6px;
}
.form-group input, .form-group textarea,
.form-field input, .form-field textarea {
    width: 100%; padding: 12px 14px; border: 1px solid var(--border);
    font-family: var(--font); font-size: 14px; color: var(--dark);
    background: var(--white); outline: none; transition: border-color .2s;
}
.form-group input:focus, .form-group textarea:focus,
.form-field input:focus, .form-field textarea:focus { border-color: var(--red); }
.form-group textarea, .form-field textarea { min-height: 120px; resize: vertical; }

.btn-submit {
    padding: 14px 36px; background: var(--red); color: #fff; border: none;
    font-family: var(--font); font-size: 12px; font-weight: 700;
    letter-spacing: .1em; text-transform: uppercase; cursor: pointer; transition: background .2s;
}
.btn-submit:hover { background: var(--red-dk); }
.form-success { border-left: 3px solid #28a745; background: #f6fff8; color: #155724; padding: 14px 18px; margin-bottom: 20px; font-size: 14px; }
.form-error   { border-left: 3px solid var(--red); background: #fff7f7; color: var(--red); padding: 14px 18px; margin-bottom: 20px; font-size: 14px; }

/* ============================================================
   ÜRETİM
   ============================================================ */
.system-card {
    background: var(--white); border-top: 3px solid var(--red);
    border: 1px solid var(--border); border-top: 3px solid var(--red);
    padding: 28px; transition: box-shadow .3s, transform .3s;
}
.system-card:hover { box-shadow: 0 10px 28px rgba(0,0,0,.09); transform: translateY(-3px); }
.system-card-title { font-size: 14px; font-weight: 700; color: var(--dark); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }
.system-card-desc { font-size: 14px; color: var(--mid); line-height: 1.75; }

/* ============================================================
   SUB BANNER (proje detay legacy)
   ============================================================ */
.sub-banner {
    margin-top: var(--nav-h); background: var(--dark); color: #fff;
    border-bottom: 3px solid var(--red); padding: 48px 0;
}
.sub-banner h1 { font-size: clamp(20px, 3.5vw, 30px); font-weight: 300; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: #111; color: #bbb; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .nav-brand { color: #fff; font-size: 16px; margin-bottom: 14px; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 280px; color: #777; }

.footer-aluk {
    display: flex; align-items: center; gap: 10px;
    margin-top: 20px; padding-top: 20px; border-top: 1px solid #222;
}
.footer-aluk img { height: 24px; width: auto; }
.footer-aluk-label { font-size: 10px; color: #555; text-transform: uppercase; letter-spacing: .1em; line-height: 1.4; }
.footer-aluk-label strong { display: block; color: var(--red); font-size: 11px; }

.footer-col h4 { font-size: 10px; text-transform: uppercase; letter-spacing: .14em; color: #fff; font-weight: 700; margin-bottom: 16px; }
.footer-col p,
.footer-col a { font-size: 13px; color: #666; line-height: 1.9; display: block; }
.footer-col a:hover { color: #fff; }
.footer-social { display: flex; gap: 8px; margin-top: 16px; }
.social-link {
    width: 34px; height: 34px; border: 1px solid #2a2a2a;
    display: flex; align-items: center; justify-content: center;
    color: #555; font-size: 13px; font-weight: 700; transition: all .2s;
}
.social-link:hover { border-color: var(--red); color: var(--red); }
.footer-bottom { border-top: 1px solid #1a1a1a; padding: 20px 0; }
.footer-bottom p { font-size: 12px; color: #333; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
    .nav-links  { display: none; }
    .nav-toggle { display: flex; }
    .hero-stats { display: none; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .contact-grid { flex-direction: column; }
    .project-features { flex-direction: column; }
    .feature-item { border-right: none; border-bottom: 1px solid var(--border); }
    .feature-item:last-child { border-bottom: none; }
    .detail-gallery { grid-template-columns: repeat(2,1fr); }
    .footer-grid { grid-template-columns: 1fr; gap: 36px; }
    .aluk-inner { flex-direction: column; gap: 40px; }
    .aluk-divider-v { display: none; }
    .aluk-text { padding-left: 0; }
    .aluk-logo-section { padding-right: 0; }
    .section-header-row { flex-direction: column; align-items: flex-start; gap: 16px; }
    .container { padding: 0 20px; }
}
@media (max-width: 600px) {
    .detail-gallery { grid-template-columns: 1fr; }
    .projects-grid  { grid-template-columns: 1fr; }
    .hero-title { font-size: 26px; }
    .intro-box { padding: 36px 24px; }
    .contact-info, .contact-form-box { padding: 28px 20px; }
    .section { padding: 56px 0; }
    .aluk-band { padding: 48px 0; }
}