:root {
    /* Logo-Inspired Colors */
    --logo-blue-dark: #0B63B4;  /* Darker blue from logo */
    --logo-blue-light: #3B8DED; /* Lighter blue from logo gradient */
    --logo-blue-text: #6FB1FC; /* Light blue from 'Solution' text */
    --pipe-grey: #88929a;     /* Grey from pipe */
    --white: #ffffff;
    --off-white: #f8f9fa;
    --dark-grey: #343a40;
    --light-grey: #adb5bd;

    /* Light Theme */
    --bg-color-light: #f4f7ff;
    --bg-gradient-light: linear-gradient(135deg, #f9fbff 0%, #e9f1ff 100%);
    --text-color-light: #1f2a3d;
    --primary-color-light: var(--logo-blue-dark);
    --secondary-color-light: var(--logo-blue-light);
    --accent-color-light: rgba(11, 99, 180, 0.06);
    --gradient-start-light: var(--logo-blue-dark);
    --gradient-end-light: var(--logo-blue-light);
    --card-bg-light: #ffffff;
    --border-color-light: rgba(11, 99, 180, 0.12);
    --heading-color-light: #0a3664;
    --link-hover-light: #0e6fd4;

    /* Dark Theme */
    --bg-color-dark: #050b18; /* Deep navy */
    --bg-gradient-dark:
        radial-gradient(1000px 1000px at 8% 12%, rgba(59, 141, 237, 0.12), transparent),
        radial-gradient(900px 900px at 82% 8%, rgba(111, 177, 252, 0.12), transparent),
        radial-gradient(700px 700px at 72% 88%, rgba(11, 99, 180, 0.14), transparent),
        #040915;
    --text-color-dark: #cfd7ec; /* Softer light text */
    --primary-color-dark: #6fb1fc; /* Brighter blue for highlights */
    --secondary-color-dark: #3b8ded;
    --accent-color-dark: rgba(255, 255, 255, 0.04);
    --gradient-start-dark: #3b8ded;
    --gradient-end-dark: #0b63b4;
    --card-bg-dark: rgba(12, 18, 38, 0.82); /* Glassy card */
    --border-color-dark: rgba(111, 177, 252, 0.18);
    --heading-color-dark: #e9f3ff; /* Clean white-blue heading */
    --link-hover-dark: #9cc9ff;

    /* Default Theme (Light) - Applied via body tag now */
    --bg-color: var(--bg-color-light);
    --bg-gradient: var(--bg-gradient-light);
    --text-color: var(--text-color-light);
    --primary-color: var(--primary-color-light);
    --secondary-color: var(--secondary-color-light);
    --accent-color: var(--accent-color-light);
    --gradient-start: var(--gradient-start-light);
    --gradient-end: var(--gradient-end-light);
    --card-bg: var(--card-bg-light);
    --border-color: var(--border-color-light);
    --heading-color: var(--heading-color-light);
    --link-hover: var(--link-hover-light);

    --font-primary: 'Sora', 'Poppins', sans-serif;
    --font-secondary: 'Inter', 'Roboto', sans-serif;

    --container-width: 1140px;
    --transition-speed: 0.3s ease;
    --glass-border: rgba(111, 177, 252, 0.18);
    --panel-shadow: 0 18px 55px rgba(5, 11, 24, 0.35);
}

/* Apply Dark Theme */
body.dark-theme {
    --bg-color: var(--bg-color-dark);
    --bg-gradient: var(--bg-gradient-dark);
    --text-color: var(--text-color-dark);
    --primary-color: var(--primary-color-dark);
    --secondary-color: var(--secondary-color-dark);
    --accent-color: var(--accent-color-dark);
    --gradient-start: var(--gradient-start-dark);
    --gradient-end: var(--gradient-end-dark);
    --card-bg: var(--card-bg-dark);
    --border-color: var(--border-color-dark);
    --heading-color: var(--heading-color-dark);
    --link-hover: var(--link-hover-dark);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px; /* Base font size */
}

body {
    font-family: var(--font-secondary);
    color: var(--text-color);
    position: relative;
    background:
        radial-gradient(1100px 900px at 12% 20%, rgba(59, 141, 237, 0.12), transparent),
        radial-gradient(800px 800px at 82% 12%, rgba(111, 177, 252, 0.12), transparent),
        radial-gradient(900px 900px at 60% 85%, rgba(11, 99, 180, 0.12), transparent),
        var(--bg-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden; /* Prevent horizontal scroll */
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 140px 140px;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

header, main, footer {
    position: relative;
    z-index: 1;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    color: var(--heading-color);
    margin-bottom: 1rem;
    line-height: 1.3;
    font-weight: 600;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }

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

a:hover {
    color: var(--link-hover);
    text-decoration: none; /* Often looks cleaner */
}

img {
    max-width: 100%;
    height: auto;
    display: block; /* Remove bottom space */
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 15px;
}

section {
    padding: 80px 0;
    overflow: hidden; /* contain floats and margins */
    position: relative;
    z-index: 1;
    isolation: isolate;
}

/* Utility Classes */
.text-gradient {
    /* Updated gradient using logo colors */
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    display: inline-block; /* Needed for gradient */
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px; /* Pill shape */
    font-weight: 600;
    transition: all var(--transition-speed);
    cursor: pointer;
    text-align: center;
    border: none;
    font-size: 1rem;
    font-family: var(--font-primary);
    margin: 5px;
    letter-spacing: 0.4px;
    text-transform: uppercase;
}

.btn-primary {
    background: linear-gradient(120deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    box-shadow: 0 10px 28px rgba(11, 99, 180, 0.25), 0 10px 45px rgba(0, 0, 0, 0.25);
    border: 1px solid var(--glass-border);
}

.btn-primary:hover {
    background: linear-gradient(120deg, var(--secondary-color), var(--primary-color));
    color: #fff;
    transform: translateY(-3px) scale(1.01);
    box-shadow: 0 16px 40px rgba(11, 99, 180, 0.3), 0 10px 45px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--primary-color);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 12px 32px rgba(11, 99, 180, 0.12);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 14px 36px rgba(11, 99, 180, 0.22);
}

.section-subtitle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.95rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    margin-bottom: 1rem;
    padding: 0.45rem 0.95rem;
    border-radius: 999px;
    background: linear-gradient(120deg, rgba(11, 99, 180, 0.12), rgba(111, 177, 252, 0.1));
    border: 1px solid var(--glass-border);
    box-shadow: 0 14px 32px rgba(11, 99, 180, 0.15);
}

.section-title {
    text-align: center;
    margin-bottom: 2.4rem;
    letter-spacing: -0.5px;
}

body.dark-theme .section-subtitle {
    color: var(--heading-color-dark);
    background: linear-gradient(120deg, rgba(59, 141, 237, 0.16), rgba(111, 177, 252, 0.08));
    border-color: rgba(111, 177, 252, 0.25);
}

/* Header Styles */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, rgba(5, 11, 24, 0.96), rgba(5, 11, 24, 0.88));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--panel-shadow);
    z-index: 1000;
    padding: 18px 0;
    transition: all 0.4s ease;
    border-bottom: 1px solid var(--glass-border);
}

body.dark-theme header {
    background: linear-gradient(90deg, rgba(5, 11, 24, 0.95), rgba(5, 11, 24, 0.9));
    box-shadow: var(--panel-shadow);
}

body:not(.dark-theme) header {
    background: linear-gradient(90deg, rgba(5, 11, 24, 0.94), rgba(5, 11, 24, 0.88));
    border-bottom: 1px solid rgba(11, 99, 180, 0.35);
    box-shadow: 0 16px 36px rgba(5, 11, 24, 0.4);
}

header.scrolled {
    padding: 15px 0;
    background: linear-gradient(90deg, rgba(5, 11, 24, 0.98), rgba(5, 11, 24, 0.92));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

body:not(.dark-theme) header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 12px 32px rgba(11, 99, 180, 0.12);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: transform 0.3s ease;
    position: relative;
    margin-right: 5rem; /* Increased margin to push navigation further */
}

header .logo img {
    height: 70px;
    transition: all 0.3s ease;
    margin-right: 12px;
    filter: brightness(0) invert(1) drop-shadow(0 2px 4px rgba(255, 255, 255, 0.3));
}

body.dark-theme header .logo img {
    filter: brightness(0) invert(1) drop-shadow(0 2px 4px rgba(255, 255, 255, 0.3));
}

/* New wrapper for logo text */
.logo-text-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center; /* Center lines horizontally */
    line-height: 1.1; /* Adjust line height */
}

/* Style for the first line */
.logo-text-line1 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--heading-color-dark);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    white-space: nowrap; /* Prevent wrapping */
}

/* Style for the second line */
.logo-text-line2 {
    font-size: 1.1rem; /* Slightly smaller */
    font-weight: 600;
    color: var(--heading-color-dark);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

body:not(.dark-theme) .logo-text-line1,
body:not(.dark-theme) .logo-text-line2 {
    color: #d8e8ff; /* Keep legible on dark header even in light theme */
}

header .logo:hover img {
    transform: scale(1.05);
}

/* Hide logo text on smaller screens */
@media (max-width: 768px) {
    .logo-text-wrapper {
        display: none;
    }
}

header nav {
    display: flex;
    align-items: center;
}

header nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

header nav ul li {
    margin-left: 3.2rem; /* Further increased spacing */
}

header nav ul li a {
    color: rgba(233, 243, 255, 0.9);
    font-weight: 600;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
    font-size: 0.95rem; /* Slightly reduced size */
    text-decoration: none;
    display: block;
    letter-spacing: 0.8px; /* Increased letter spacing */
    text-transform: uppercase;
}

body:not(.dark-theme) header nav ul li a {
    color: rgba(233, 243, 255, 0.9);
}

header nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
    border-radius: 2px;
}

header nav ul li a:hover,
header nav ul li a.active {
    color: var(--primary-color-dark);
}

header nav ul li a:hover::after,
header nav ul li a.active::after {
    width: 100%;
}

/* Theme Toggle Button */
#theme-toggle {
    background: none;
    border: none;
    color: rgba(233, 243, 255, 0.9);
    font-size: 1.3rem;
    cursor: pointer;
    margin-left: 1.5rem;
    transition: transform 0.3s ease, color 0.3s ease;
    padding: 0.5rem;
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

body:not(.dark-theme) #theme-toggle {
    color: rgba(233, 243, 255, 0.9);
}

#theme-toggle:hover {
    color: var(--primary-color);
    transform: rotate(15deg);
    background-color: rgba(255, 255, 255, 0.1);
}

body:not(.dark-theme) #theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

/* Burger Menu Button - Hidden by default on desktop */
.burger-menu {
    display: none;
    background: none;
    border: none;
    color: rgba(233, 243, 255, 0.9);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 0.5rem;
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
}

body:not(.dark-theme) .burger-menu {
    color: var(--heading-color);
}

.burger-menu:hover {
    color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.1);
}

body:not(.dark-theme) .burger-menu:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

/* Hero Section */
#anasayfa {
    padding-top: 190px;
    padding-bottom: 140px;
    min-height: 95vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-gradient-dark);
    position: relative;
    overflow: hidden;
    text-align: center;
    color: var(--heading-color-dark);
}

#anasayfa::before {
    content: '';
    position: absolute;
    inset: -120px;
    background:
        radial-gradient(720px 720px at 14% 18%, rgba(111, 177, 252, 0.25), transparent),
        radial-gradient(520px 520px at 82% 18%, rgba(59, 141, 237, 0.2), transparent),
        radial-gradient(520px 520px at 76% 82%, rgba(11, 99, 180, 0.18), transparent);
    filter: blur(6px);
    opacity: 0.9;
    pointer-events: none;
    z-index: 0;
}

#anasayfa::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 220px 220px;
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--panel-shadow);
}

body:not(.dark-theme) #anasayfa .hero-content {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.08));
    border-color: rgba(11, 99, 180, 0.25);
    box-shadow: 0 24px 70px rgba(11, 99, 180, 0.2);
}

/* New subtitle style */
.hero-subtitle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.2rem;
    padding: 0.55rem 1.1rem;
    border-radius: 999px;
    background: linear-gradient(120deg, rgba(59, 141, 237, 0.18), rgba(111, 177, 252, 0.12));
    border: 1px solid rgba(111, 177, 252, 0.35);
}

.hero-content h1 {
    font-size: 3.9rem;
    font-weight: 800;
    margin-bottom: 1.3rem;
    line-height: 1.2;
    color: var(--heading-color-dark);
    text-shadow: 0 6px 28px rgba(0, 0, 0, 0.25);
}

/* Highlight part of the H1 like the example */
.hero-content h1 .highlight {
    background: linear-gradient(120deg, var(--primary-color-dark), var(--secondary-color-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2.4rem;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-color-dark);
    opacity: 0.9;
}

.hero-buttons {
    margin-top: 1rem;
    margin-bottom: 2.8rem;
}

/* Style the primary hero button like the example */
#anasayfa .hero-buttons .btn-primary {
    padding: 1rem 2.4rem;
    font-size: 1.05rem;
    letter-spacing: 0.6px;
    box-shadow: 0 20px 55px rgba(59, 141, 237, 0.35);
    border-width: 1px;
}

#anasayfa .hero-buttons .btn-primary:hover {
    box-shadow: 0 24px 65px rgba(59, 141, 237, 0.4);
}

/* Ensure icon aligns */
#anasayfa .hero-buttons .btn i {
    margin-left: 10px;
    font-size: 0.9em; /* Adjust icon size relative to button text */
    transition: transform 0.3s ease;
}

#anasayfa .hero-buttons .btn:hover i {
    transform: translateX(4px);
}

/* Scroll Down Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 26px;
    height: 44px;
    border: 2px solid rgba(255, 255, 255, 0.45);
    border-radius: 50px;
    z-index: 2;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0));
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 5px;
    height: 10px;
    background: linear-gradient(180deg, var(--primary-color-dark), var(--secondary-color-dark));
    border-radius: 3px;
    animation: scroll-anim 2s infinite ease-in-out;
}

@keyframes scroll-anim {
    0% { transform: translate(-50%, 0); opacity: 1; }
    50% { transform: translate(-50%, 10px); opacity: 1; }
    100% { transform: translate(-50%, 20px); opacity: 0; }
}

/* Sections General */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header .section-subtitle {
    margin-bottom: 0.5rem;
}

.section-header .section-title {
    margin-bottom: 1rem;
}

.section-header p {
     max-width: 600px;
     margin: 0 auto;
     color: var(--text-color);
     opacity: 0.8;
}

/* Apply default backgrounds to main content sections */
#hakkimizda,
#hizmetlerimiz,
#kalite,
#boru-sistemleri,
#techiz-sistemleri {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(240, 247, 255, 0.9) 100%);
    padding: 80px 0;
    box-shadow: inset 0 1px 0 rgba(11, 99, 180, 0.05);
}

/* Override for dark theme */
body.dark-theme #hakkimizda,
body.dark-theme #hizmetlerimiz,
body.dark-theme #kalite,
body.dark-theme #boru-sistemleri,
body.dark-theme #techiz-sistemleri {
    background: linear-gradient(180deg, rgba(12, 18, 38, 0.72) 0%, rgba(5, 11, 24, 0.75) 100%);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

/* Ensure specific sections like vizyon/misyon/iletisim keep their unique backgrounds */
/* (Their specific ID selectors will override the general ones above) */

/* About Us Section */
#hakkimizda .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
}

.about-image img, .quality-image img, .piping-image img {
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-height: 400px;
    object-fit: cover;
    width: 100%;
}

body.dark-theme .about-image img,
body.dark-theme .quality-image img,
body.dark-theme .piping-image img {
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.about-content h3 {
    margin-top: 1.5rem; /* Space above title */
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--heading-color);
}

.about-content p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    opacity: 0.9;
}

.features-list {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.86));
    padding: 1.5rem;
    border-radius: 14px;
    border: 1px solid rgba(11, 99, 180, 0.12);
    border-left: 5px solid var(--secondary-color);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
    box-shadow: 0 16px 40px rgba(11, 99, 180, 0.12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .feature-item {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 14px 38px rgba(0, 0, 0, 0.35);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 18px 48px rgba(11, 99, 180, 0.2);
    border-color: rgba(11, 99, 180, 0.25);
}

body.dark-theme .feature-item:hover {
     box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--heading-color);
}

.feature-item p {
    font-size: 0.95rem;
    margin-bottom: 0;
    color: var(--text-color);
    opacity: 0.8;
}

/* Vision & Mission Section */
#vizyon-misyon {
    /* These specific rules will override the general section background */
    background: linear-gradient(135deg, rgba(11, 99, 180, 0.08), rgba(111, 177, 252, 0.12));
    padding: 80px 0; /* Ensure padding is consistent */
}

body.dark-theme #vizyon-misyon {
    background: linear-gradient(135deg, rgba(59, 141, 237, 0.16), rgba(11, 99, 180, 0.08));
}

.vision-mission-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.vm-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.86));
    padding: 2rem;
    border-radius: 14px;
    box-shadow: 0 18px 48px rgba(11, 99, 180, 0.14);
    transition: transform var(--transition-speed), background-color var(--transition-speed), border-color var(--transition-speed);
    border-top: 5px solid transparent; /* For hover effect */
    border: 1px solid rgba(11, 99, 180, 0.12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .vm-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 20px 55px rgba(0, 0, 0, 0.4);
}

.vm-card:hover {
    transform: translateY(-8px);
    border-top-color: var(--primary-color);
    box-shadow: 0 22px 60px rgba(11, 99, 180, 0.2);
}

.vm-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.vm-card p {
    margin-bottom: 0;
    color: var(--text-color);
    opacity: 0.9;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.service-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.86));
    padding: 2.5rem 2rem;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(11, 99, 180, 0.14);
    text-align: center;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(11, 99, 180, 0.14);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .service-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.42);
}

/* Restore ::before for background effect on hover */
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    /* Diagonal gradient using primary colors */
    background: linear-gradient(135deg, transparent 30%, rgba(59, 141, 237, 0.12) 60%, rgba(11, 99, 180, 0.16) 100%);
    transition: left var(--transition-speed);
    z-index: 0;
    opacity: 0.2; /* Subtle opacity */
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 24px 55px rgba(11, 99, 180, 0.2); /* Even stronger shadow on hover */
    border-color: rgba(11, 99, 180, 0.35);
}

/* Bring the gradient in on hover */
.service-card:hover::before {
    left: 0;
    opacity: 0.3; /* Slightly increase opacity */
}

/* Ensure content stays above pseudo-element */
.service-card h3,
.service-card p,
.service-card a {
    position: relative; /* Keep content above ::before */
    z-index: 1;
    color: inherit; /* Reset color (removed previous override) */
}

.service-card:hover h3 {
    color: var(--primary-color); /* Make title primary color on hover */
}

.service-card:hover a {
    color: var(--primary-color); /* Ensure link keeps color */
}

.service-card:hover a i {
    color: var(--primary-color); /* Ensure icon keeps color */
}

.service-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--heading-color);
    transition: color var(--transition-speed);
}

.service-card p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    opacity: 0.8;
    min-height: 80px; /* Ensure consistent card height */
}

.service-card a {
    font-weight: 600;
    color: var(--primary-color);
    display: inline-flex; /* Align icon properly */
    align-items: center;
    transition: color var(--transition-speed);
}

.service-card a i {
    margin-left: 8px;
    transition: transform var(--transition-speed), color var(--transition-speed);
    color: var(--primary-color);
}

.service-card a:hover i {
    transform: translateX(5px);
}

/* Quality Section - Similar layout to About */
#kalite .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
}

#kalite .quality-content {
    order: 1; /* Text first on large screens */
}

#kalite .quality-image {
    order: 2; /* Image second on large screens */
}

.quality-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--heading-color);
}

.quality-content p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    opacity: 0.9;
}

/* Piping Systems Section */
#boru-sistemleri {
     background-color: var(--bg-color); /* Slightly different bg if needed */
}

.piping-intro {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
}

.piping-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
    text-align: center;
}

.piping-stat {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.88));
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 18px 42px rgba(11, 99, 180, 0.12);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border: 1px solid rgba(11, 99, 180, 0.12);
}

body.dark-theme .piping-stat {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.38);
}

.piping-stat:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 52px rgba(11, 99, 180, 0.2);
}

.piping-stat h4 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.piping-stat h4 i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.piping-stat p {
    font-size: 1rem;
    margin-bottom: 0;
    color: var(--text-color);
    font-weight: 500;
}

/* Accordion Styles */
.piping-details-accordion {
    margin-bottom: 4rem;
}

.accordion-item {
    background-color: var(--card-bg);
    margin-bottom: 1rem;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    overflow: hidden; /* Ensure content stays within rounded corners */
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    cursor: pointer;
    background-color: var(--card-bg); /* Match item bg */
    transition: background-color var(--transition-speed);
}

.accordion-header:hover {
    background-color: var(--accent-color-light); /* Subtle hover */
}

body.dark-theme .accordion-header:hover {
     background-color: var(--accent-color-dark);
}

.accordion-header h4 {
    margin-bottom: 0;
    font-size: 1.2rem;
    color: var(--heading-color);
}

.accordion-icon {
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: transform var(--transition-speed);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}


.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
    background-color: var(--bg-color); /* Slightly different background */
}

.accordion-content-inner {
     padding: 1.5rem;
     border-top: 1px solid var(--border-color);
}

.accordion-content-inner h4 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--secondary-color);
}

.accordion-content-inner h4:first-child {
    margin-top: 0;
}

.accordion-content-inner h5 {
    font-size: 1rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--heading-color);
}

.accordion-content-inner ul {
    list-style: disc;
    margin-left: 20px;
    margin-bottom: 1rem;
}

.accordion-content-inner ul li {
    margin-bottom: 0.3rem;
    color: var(--text-color);
    opacity: 0.9;
}

.accordion-content-inner p {
    margin-bottom: 1rem;
}

.standard-badge {
    display: inline-block;
    background-color: var(--secondary-color);
    color: #fff;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Gemi Sistemleri */
.gemi-sistemleri {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.86));
    padding: 2.5rem;
    border-radius: 16px;
    margin-bottom: 4rem;
    border: 1px solid rgba(11, 99, 180, 0.12);
    box-shadow: 0 18px 48px rgba(11, 99, 180, 0.12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .gemi-sistemleri {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 20px 55px rgba(0, 0, 0, 0.4);
}

.gemi-sistemleri h3 {
    text-align: center;
    margin-bottom: 1rem;
}

.gemi-sistemleri p {
    text-align: center;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.sistemler-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.sistemler-list li {
    background-color: var(--bg-color);
    padding: 0.8rem 1.2rem;
    border-radius: 5px;
    border-left: 4px solid var(--primary-color);
    font-weight: 500;
}

/* CTA Area */
.cta-area {
    background: linear-gradient(120deg, #0b63b4 0%, #3b8ded 50%, #6fb1fc 100%);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    color: var(--white);
    box-shadow: 0 24px 70px rgba(11, 99, 180, 0.4);
    position: relative;
    overflow: hidden;
}

.cta-area h3 {
    color: var(--white);
    margin-bottom: 0.8rem;
}

.cta-area p {
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.cta-area .btn {
    background-color: var(--white);
    color: var(--primary-color);
}

/* Specific hover for light theme */
body:not(.dark-theme) .cta-area .btn:hover {
    background-color: var(--accent-color-light);
    color: var(--primary-color);
}

/* Specific hover for dark theme */
body.dark-theme .cta-area .btn {
    background-color: var(--bg-color-dark);
    color: var(--white);
}

body.dark-theme .cta-area .btn:hover {
    background-color: var(--secondary-color-dark);
    color: var(--white);
}

.cta-area .btn i {
    margin-left: 8px;
}

/* Equipment Systems Section */
.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem; /* Slightly smaller gap */
    margin-bottom: 4rem;
}

.equipment-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.86));
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 18px 48px rgba(11, 99, 180, 0.14);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid rgba(11, 99, 180, 0.14);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .equipment-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.42);
}

.equipment-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 58px rgba(11, 99, 180, 0.2);
    border-color: rgba(11, 99, 180, 0.25);
}

.equipment-card-content {
    padding: 1.5rem;
}

.equipment-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.7rem;
    color: var(--heading-color);
}

.equipment-card p {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    opacity: 0.8;
    flex-grow: 1; /* Allow paragraph to grow */
}

.equipment-card .details-link {
    display: inline-block;
    padding: 1rem 1.5rem;
    background: linear-gradient(120deg, rgba(11, 99, 180, 0.1), rgba(111, 177, 252, 0.12));
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    width: 100%; /* Make button full width of card */
    border-top: 1px solid var(--border-color);
}

.equipment-card .details-link:hover {
    background-color: var(--primary-color);
    color: #fff;
}

body.dark-theme .equipment-card .details-link {
     background: linear-gradient(120deg, rgba(59, 141, 237, 0.18), rgba(111, 177, 252, 0.12));
     color: var(--heading-color-dark);
     border-top: 1px solid var(--glass-border);
}

body.dark-theme .equipment-card .details-link:hover {
     background: linear-gradient(120deg, var(--secondary-color-dark), var(--primary-color-dark));
     color: #040915;
}

.equipment-card .details-link i {
    margin-left: 5px;
    transition: transform var(--transition-speed);
}

.equipment-card .details-link:hover i {
    transform: translateX(4px);
}

/* Hidden Details & Modal */
#techiz-details {
    display: none;
}

#techiz-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7); /* Dark overlay */
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility var(--transition-speed);
    padding: 20px;
}

#techiz-modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 10px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    transform: scale(0.9);
    transition: transform var(--transition-speed);
}

#techiz-modal.show .modal-content {
    transform: scale(1);
}

.close-modal-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-color);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: color var(--transition-speed);
}

.close-modal-btn:hover {
    color: var(--primary-color);
}

#modal-body h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

#modal-body p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    opacity: 0.9;
}

#modal-body .features-list-modal {
    margin-top: 1.5rem;
    margin-bottom: 2rem;
}

#modal-body .features-list-modal h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

#modal-body .features-list-modal ul {
    list-style: disc;
    margin-left: 20px;
}

#modal-body .features-list-modal ul li {
    margin-bottom: 0.5rem;
}

.modal-cta-button {
    display: inline-block;
    margin-top: 1rem;
    /* Style like .btn-primary */
    background-color: var(--primary-color);
    color: #fff;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all var(--transition-speed);
    cursor: pointer;
    text-align: center;
    border: none;
    font-size: 1rem;
    font-family: var(--font-primary);
}

.modal-cta-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.modal-cta-button i {
    margin-left: 8px;
}

/* Contact Section */
#iletisim {
    /* These specific rules will override the general section background */
    background: linear-gradient(135deg, rgba(11, 99, 180, 0.08), rgba(111, 177, 252, 0.12));
    padding: 80px 0; /* Ensure padding is consistent */
}

body.dark-theme #iletisim {
    background: linear-gradient(135deg, rgba(59, 141, 237, 0.16), rgba(11, 99, 180, 0.08));
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr; /* Adjust ratio as needed */
    gap: 3rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.86));
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 24px 70px rgba(11, 99, 180, 0.12);
    border: 1px solid rgba(11, 99, 180, 0.12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

body.dark-theme .contact-wrapper {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    border-color: var(--glass-border);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

.contact-info h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.contact-info p {
    margin-bottom: 2rem;
    opacity: 0.8;
}

.contact-details li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.contact-details i {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-right: 1rem;
    margin-top: 0.2rem; /* Align icon better with text */
    width: 25px; /* Ensure consistent spacing */
    text-align: center;
}

.contact-details span {
    display: block;
    color: var(--text-color);
}

.social-media {
    margin-top: 2rem;
}

.social-media a {
    display: inline-block;
    margin-right: 1rem;
    font-size: 1.5rem;
    color: var(--secondary-color);
    transition: transform var(--transition-speed), color var(--transition-speed);
}

.social-media a:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--heading-color);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color var(--transition-speed);
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form input[type="tel"]:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 95, 115, 0.1);
}

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-form .btn i {
    margin-left: 8px;
}

/* Footer */
footer {
    /* Use dark theme background color for footer in both themes */
    background: linear-gradient(180deg, #0a1328 0%, #050b18 100%);
    color: var(--text-color-dark); /* Use dark theme text color */
    padding: 4rem 0 2rem 0;
    margin-top: 80px; /* Increased space above footer */
    border-top: 3px solid var(--primary-color-dark); /* Add accent border */
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(520px 520px at 18% 0%, rgba(59, 141, 237, 0.18), transparent),
        radial-gradient(480px 480px at 82% 10%, rgba(111, 177, 252, 0.16), transparent);
    opacity: 0.9;
    pointer-events: none;
}

footer > * {
    position: relative;
    z-index: 1;
}

/* Remove light theme footer background override */
/*
body:not(.dark-theme) footer {
     background-color: var(--heading-color-light);
     color: rgba(255, 255, 255, 0.8);
}
*/

.footer-content {
    display: grid;
    /* Adjusted grid columns for better balance */
    grid-template-columns: 2fr 1fr 1.5fr; /* Example: Adjust ratios as needed */
    gap: 3rem; /* Increased gap */
    margin-bottom: 3rem; /* Increased margin */
    align-items: start; /* Align items to the top */
}

/* Footer About Section */
.footer-about .logo.footer-logo {
    /* display: inline-block; Remove this if present */
    display: flex; /* Use flex to align items horizontally */
    align-items: center; /* Vertically center image and text block */
    margin-bottom: 1.5rem;
}

.footer-about .logo.footer-logo img {
    height: 75px; /* Increased size (1.5 * 50px) */
    /* margin-bottom: 0.5rem; Remove bottom margin */
    margin-right: 1rem; /* Add space between image and text */
}

/* Ensure text wrapper is visible */
.footer-about .logo.footer-logo .logo-text-wrapper {
     display: flex; /* Keep as flex column */
     flex-direction: column;
     align-items: flex-start; /* Keep text left-aligned */
     line-height: 1.1;
}

/* Ensure footer logo text uses appropriate color */
.footer-about .logo.footer-logo .logo-text-line1,
.footer-about .logo.footer-logo .logo-text-line2 {
    color: var(--primary-color-dark); /* Use light blue for contrast */
    /* Adjust font sizes slightly if needed for balance */
}

.footer-about p {
    font-size: 0.95rem;
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

footer .social-media a {
    color: var(--text-color-dark); /* Use standard dark text color */
    font-size: 1.3rem; /* Slightly smaller icons */
    margin-right: 1rem;
    opacity: 0.7;
    transition: opacity var(--transition-speed), color var(--transition-speed);
}

footer .social-media a:hover {
    opacity: 1;
    color: var(--primary-color-dark); /* Highlight color */
    transform: none; /* Remove previous scale transform */
}

/* Footer Headings */
footer h4 {
    font-size: 1.1rem; /* Adjusted size */
    color: var(--primary-color-dark); /* Use accent color */
    margin-bottom: 1.5rem; /* Increased spacing */
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Footer Links */
footer ul li {
    margin-bottom: 0.8rem; /* Slightly increased spacing */
}

footer ul li a {
    color: var(--text-color-dark);
    opacity: 0.8;
    transition: color var(--transition-speed), opacity var(--transition-speed), padding-left var(--transition-speed);
    padding-left: 0; /* Reset padding */
    font-size: 0.95rem;
}

footer ul li a:hover {
    color: var(--primary-color-dark);
    opacity: 1;
    padding-left: 8px; /* Indent on hover */
}

/* Footer Contact Info */
footer .footer-contact address span {
    display: flex; /* Align icon and text */
    align-items: flex-start;
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    opacity: 0.8;
}

footer .footer-contact address i {
    color: var(--primary-color-dark);
    margin-right: 0.8rem;
    margin-top: 0.2rem; /* Align icon better */
    width: 18px; /* Consistent icon width */
    text-align: center;
}

footer .footer-contact address a {
    color: var(--text-color-dark);
    transition: color var(--transition-speed);
}

footer .footer-contact address a:hover {
    color: var(--primary-color-dark);
}

/* Footer Bottom */
.footer-bottom {
    text-align: center;
    padding-top: 2.5rem; /* Increased padding */
    border-top: 1px solid var(--border-color-dark); /* Use variable */
    font-size: 0.85rem; /* Slightly smaller */
    color: var(--text-color-dark);
    opacity: 0.7;
}

/* Scroll to Top Button */
#scrollToTopBtn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 14px 34px rgba(11, 99, 180, 0.28);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-speed), visibility var(--transition-speed), transform var(--transition-speed);
    z-index: 1000;
}

#scrollToTopBtn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#scrollToTopBtn:hover {
    background-color: var(--secondary-color);
}

/* Animation on Scroll */
.animate-on-scroll {
    opacity: 0;
    /* Slightly larger initial offset and added subtle scale */
    transform: translateY(50px) scale(0.98);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    /* Reset transform */
    transform: translateY(0) scale(1);
}

/* Add delays for staggered animations if desired */
.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }

/* Mobile Styles */
@media (max-width: 992px) {
    html { font-size: 15px; }
    .container { width: 95%; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .hero-content h1 { font-size: 3rem; }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    #hakkimizda .container,
    #kalite .container,
    .piping-intro,
    .gemi-sistemleri,
    .cta-area {
        grid-template-columns: 1fr;
    }

    #kalite .quality-content {
        order: 1;
    }

    #kalite .quality-image {
        order: 2;
        margin-top: 2rem;
    }

     .about-image,
     .piping-image,
     .equipment-image {
        margin-top: 2rem;
     }
}

@media (max-width: 768px) {
    /* Mobile menu styles */
    .burger-menu {
        display: block;
        position: relative;
        z-index: 1001;
        margin-left: auto;
        font-size: 2rem;
    }

    header nav {
        position: relative;
    }

    header nav ul {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background-color: var(--bg-color);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        padding: 5rem 2rem;
        transition: right 0.3s ease-in-out;
        z-index: 1000;
        justify-content: flex-start;
        align-items: flex-start;
        overflow-y: auto;
    }

    body.dark-theme header nav ul {
        background-color: var(--bg-color-dark);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
    }

    header nav ul.active {
        right: 0;
    }

    header nav ul li {
        margin: 0;
        width: 100%;
        padding: 0.75rem 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    body.dark-theme header nav ul li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    header nav ul li a {
        font-size: 1.2rem;
        width: 100%;
        display: block;
    }

    header nav ul li:last-child {
        margin-top: 2rem;
        text-align: center;
        border-bottom: none;
    }

    header nav ul li a::after {
        bottom: -8px;
    }

    #theme-toggle {
        font-size: 1.8rem;
        margin-left: 0;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
    .btn { padding: 0.7rem 1.5rem; font-size: 0.9rem; }

    .piping-intro, .gemi-sistemleri {
        grid-template-columns: 1fr;
    }
    .piping-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    footer .logo { text-align: center; }
    footer .social-media { text-align: center; }
}

@media (max-width: 576px) {
    section { padding: 60px 0; }
    .hero-content h1 { font-size: 2.2rem; }
    .hero-buttons .btn {
        display: block;
        width: 80%;
        margin: 10px auto;
    }

    .services-grid,
    .equipment-grid,
    .vision-mission-cards,
    .features-list {
        grid-template-columns: 1fr;
    }

     .piping-stat h4 {
        font-size: 1.8rem;
    }
    .modal-content { padding: 1.5rem; }
    .close-modal-btn { top: 10px; right: 15px; font-size: 1.5rem;}
    #modal-body h3 { font-size: 1.5rem; }
    #scrollToTopBtn { width: 45px; height: 70px; font-size: 1.2rem; bottom: 20px; right: 20px; }
}

/* --- Dark Theme Hero Button Overrides --- */
/*
body.dark-theme #anasayfa .hero-buttons .btn-primary {
    ...
}
body.dark-theme #anasayfa .hero-buttons .btn-primary:hover {
    ...
}
body.dark-theme #anasayfa .hero-buttons .btn-secondary {
    ...
}
body.dark-theme #anasayfa .hero-buttons .btn-secondary:hover {
    ...
}
*/
/* --- End Dark Theme Hero Button Overrides --- */

.hero-buttons .btn i {
    margin-left: 8px;
    transition: transform var(--transition-speed);
}

.hero-buttons .btn:hover i {
    transform: translateX(5px);
}