/* ============================================
   Berk İnşaat Mühendislik - Main Stylesheet
   ============================================ */

:root {
    --color-primary: #c8a45c;
    --color-primary-dark: #b08d3e;
    --color-dark: #0f1923;
    --color-dark-2: #1a2836;
    --color-dark-3: #243444;
    --color-text: #d1d9e0;
    --color-text-muted: #8a99a8;
    --color-white: #f0f2f5;
    --color-border: rgba(200,164,92,0.15);
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
    --container: 1200px;
    --header-h: 80px;
    --radius: 6px;
    --radius-lg: 12px;
    --shadow: 0 4px 30px rgba(0,0,0,0.3);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

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

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-white); }

img { max-width: 100%; display: block; }

/* ---- Section Helpers ---- */
.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-dark);
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(200,164,92,0.3);
}

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

.btn-lg { padding: 18px 40px; font-size: 1.05rem; }
.btn-full { width: 100%; }

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(15,25,35,0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-white);
    text-decoration: none;
}
.logo:hover { color: var(--color-primary); }

.logo-icon { color: var(--color-primary); }

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.05);
}

.logo-img--footer {
    height: 44px;
}

.logo-text {
    font-size: 1rem;
    line-height: 1.3;
    letter-spacing: 0.5px;
}
.logo-text strong { font-weight: 700; font-size: 1.1em; }
.logo-sub { font-size: 0.7em; letter-spacing: 2px; text-transform: uppercase; color: var(--color-text-muted); }

.nav { display: flex; align-items: center; gap: 4px; }

.nav-link {
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius);
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--color-white); }

.nav-link--cta {
    background: var(--color-primary);
    color: var(--color-dark) !important;
    font-weight: 600;
    margin-left: 8px;
}
.nav-link--cta:hover { background: var(--color-primary-dark); }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.hamburger span {
    width: 24px; height: 2px;
    background: var(--color-white);
    transition: var(--transition);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    background: rgba(15,25,35,0.98);
    backdrop-filter: blur(12px);
    padding: 20px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
}
.mobile-nav.open { display: flex; }
.mobile-nav-link {
    padding: 14px 16px;
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius);
}
.mobile-nav-link:hover { color: var(--color-white); background: var(--color-dark-2); }

/* ============================================
   HERO
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-dark) url('../images/hero/hero-bg.jpg') center/cover no-repeat;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, rgba(15,25,35,0.5) 0%, rgba(15,25,35,0.92) 100%);
    z-index: 1;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 80px,
            rgba(200,164,92,0.03) 80px,
            rgba(200,164,92,0.03) 81px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 80px,
            rgba(200,164,92,0.03) 80px,
            rgba(200,164,92,0.03) 81px
        );
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    padding-top: var(--header-h);
}

.hero-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
    padding: 8px 18px;
    border-radius: 50px;
    margin-bottom: 28px;
    animation: fadeUp 0.8s ease both;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.2rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.15;
    margin-bottom: 24px;
    animation: fadeUp 0.8s ease 0.15s both;
}

.hero-accent {
    color: var(--color-primary);
    font-style: italic;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 520px;
    margin-bottom: 36px;
    animation: fadeUp 0.8s ease 0.3s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeUp 0.8s ease 0.45s both;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    right: 40px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.7); }
    50% { opacity: 1; transform: scaleY(1); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   STATS
   ============================================ */
.stats {
    background: var(--color-dark-2);
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 10px;
}

.stat-number {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-suffix {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--color-primary);
}

.stat-label {
    display: block;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
}

/* ============================================
   ABOUT
   ============================================ */
.about {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image-placeholder {
    background: #171f30;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: 48px 36px;
}

.about-image-placeholder img {
    width: 100%;
    max-width: 440px;
    height: auto;
    object-fit: contain;
    transition: var(--transition);
}

.about-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: var(--color-primary);
    color: var(--color-dark);
    padding: 20px 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
}

.about-badge-year {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.about-badge-text {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--color-text-muted);
}

.about-features {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.about-feature-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background: rgba(200,164,92,0.1);
    color: var(--color-primary);
}

.about-feature strong {
    display: block;
    color: var(--color-white);
    margin-bottom: 2px;
}

.about-feature p {
    font-size: 0.88rem;
    margin: 0;
}

/* ============================================
   SERVICES
   ============================================ */
.services {
    padding: 100px 0;
    background: var(--color-dark-2);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(200,164,92,0.1);
}

.service-icon {
    color: var(--color-primary);
    margin-bottom: 20px;
}

.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--color-white);
    margin-bottom: 10px;
}

.service-card p {
    font-size: 0.92rem;
    color: var(--color-text-muted);
}

/* ============================================
   CTA BANNER
   ============================================ */
.cta-banner {
    background: var(--color-primary);
    padding: 60px 0;
}

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
}

.cta-inner h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--color-dark);
}

.cta-inner p {
    color: rgba(15,25,35,0.7);
    margin-top: 4px;
}

.cta-banner .btn-primary {
    background: var(--color-dark);
    color: var(--color-primary);
    border-color: var(--color-dark);
}
.cta-banner .btn-primary:hover {
    background: var(--color-dark-2);
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

/* ============================================
   PROJECTS (UNIFIED COMPACT CARDS & FILTER)
   ============================================ */
.projects {
    padding: 100px 0;
}

/* Category Filter Bar */
.projects-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 9px 20px;
    border-radius: 50px;
    background: var(--color-dark-2);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--color-white);
    border-color: rgba(200, 164, 92, 0.4);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: var(--color-primary);
    color: var(--color-dark);
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(200, 164, 92, 0.25);
    transform: translateY(-2px);
}

/* Unified Cards Grid */
.projects-grid-unified {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 22px;
}

.project-unified-card {
    background: var(--color-dark-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.project-unified-card:hover {
    border-color: rgba(200, 164, 92, 0.45);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.project-unified-card.hidden {
    display: none !important;
}

/* Card Top (Image or Themed Graphic) */
.card-visual {
    position: relative;
    height: 155px;
    background: #f4f6f8;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.card-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-unified-card:hover .card-visual img {
    transform: scale(1.05);
}

.card-visual-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: rgba(200, 164, 92, 0.08);
    border: 1px solid rgba(200, 164, 92, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    transition: var(--transition);
}

.project-unified-card:hover .card-visual-icon {
    transform: scale(1.1);
    background: rgba(200, 164, 92, 0.16);
    border-color: var(--color-primary);
}

.card-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-primary);
    background: rgba(15, 25, 35, 0.92);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(200, 164, 92, 0.25);
    padding: 3px 10px;
    border-radius: 50px;
}

.card-year {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(200, 164, 92, 0.9);
    color: var(--color-dark);
    padding: 2px 8px;
    border-radius: 4px;
}

/* Card Body */
.card-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-content h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--color-white);
    margin-bottom: 8px;
    line-height: 1.35;
}

.card-content p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 14px;
    flex: 1;
}

.card-footer-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.card-loc {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-muted);
}

.card-stat {
    color: var(--color-primary);
    font-weight: 600;
}

/* Load More Button */
.projects-load-more {
    text-align: center;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .projects-grid-unified {
        grid-template-columns: 1fr;
    }
    .projects-filter {
        gap: 6px;
    }
    .filter-btn {
        padding: 6px 14px;
        font-size: 0.8rem;
    }
}

/* ============================================
   TESTIMONIALS
   ============================================ */
.testimonials {
    padding: 100px 0;
    background: var(--color-dark-2);
}

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

.testimonial-card {
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.testimonial-quote {
    font-family: var(--font-display);
    font-size: 4rem;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: -10px;
}

.testimonial-card p {
    font-size: 1rem;
    color: var(--color-text);
    font-style: italic;
    margin-bottom: 24px;
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(200,164,92,0.15);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.testimonial-author strong {
    display: block;
    color: var(--color-white);
    font-size: 0.95rem;
}

.testimonial-author span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ---- Referans Logoları ---- */
.references-logos {
    margin-bottom: 60px;
}

.references-logos-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--color-white);
    text-align: center;
    margin-bottom: 32px;
}

.logos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    align-items: center;
    justify-items: center;
}

.logo-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 110px;
    width: 100%;
    transition: var(--transition);
}

.logo-item:hover {
    background: rgba(200,164,92,0.08);
    border-color: rgba(200,164,92,0.35);
}

.logo-item img {
    max-height: 65px;
    max-width: 130px;
    object-fit: contain;
    filter: grayscale(100%) brightness(1.6);
    opacity: 0.65;
    transition: var(--transition);
}

.logo-item:hover img {
    filter: none;
    opacity: 1;
}

/* ============================================
   CONTACT
   ============================================ */
.contact {
    padding: 100px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: flex-start;
}

.contact-info p {
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    color: var(--color-primary);
}

.contact-item div strong {
    display: block;
    color: var(--color-white);
    margin-bottom: 2px;
}

.contact-item div p,
.contact-item div a {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    margin: 0;
}

.contact-form-wrapper {
    background: var(--color-dark-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(200,164,92,0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-dark-2);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 0.88rem;
    color: var(--color-text-muted);
    max-width: 360px;
}

.logo--footer { margin-bottom: 8px; }

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-links a {
    display: block;
    font-size: 0.88rem;
    color: var(--color-text-muted);
    padding: 4px 0;
}
.footer-links a:hover { color: var(--color-primary); }

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .about-grid,
    .contact-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .project-card--large { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .hamburger { display: flex; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .cta-inner { flex-direction: column; text-align: center; }
    .hero-scroll { display: none; }
    .footer-top { grid-template-columns: 1fr; }
    .about-image-placeholder { min-height: 260px; padding: 32px 20px; }
    .about-badge { right: 10px; bottom: -10px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
}