/* --- Değişkenler --- */
:root {
    --bg-dark: #1b1b1b;
    --bg-concrete: #2c2c2c;
    --color-yellow: #fbff00;    /* Safety Yellow */
    --color-white: #ffffff;
    --color-grey: #a0a0a0;
    
    --font-head: 'Rajdhani', sans-serif;
    --font-body: 'Barlow', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--color-white);
    font-family: var(--font-body);
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* --- Header --- */
.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 100;
    transition: 0.3s;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent);
}
.glass-header.dark-mode { background: #111; border-bottom: 1px solid #333; }

.container { width: 90%; max-width: 1400px; margin: 0 auto; }
.header-flex { display: flex; justify-content: space-between; align-items: center; }

.logo { font-family: var(--font-head); font-size: 2.5rem; font-weight: 700; color: #fff; letter-spacing: 2px; }
.dot-yellow { color: var(--color-yellow); }

.top-nav ul { display: flex; gap: 40px; align-items: center; }
.top-nav a { font-weight: 600; text-transform: uppercase; font-size: 0.9rem; letter-spacing: 1px; color: #ccc; }
.top-nav a:hover, .top-nav a.active { color: var(--color-white); }

.btn-yellow { background: var(--color-yellow); color: #000 !important; padding: 10px 25px; font-weight: 800; border: none; font-family: var(--font-head); }
.btn-yellow:hover { background: #fff; }

.menu-icon { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; }
.burger-line { width: 30px; height: 2px; background: #fff; }

/* --- Fullscreen Menu --- */
.fullscreen-menu {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--color-yellow); z-index: 200;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    transform: translateY(-100%); transition: 0.5s cubic-bezier(0.77, 0, 0.175, 1);
}
.fullscreen-menu.active { transform: translateY(0); }
.close-menu { position: absolute; top: 30px; right: 30px; font-size: 3rem; background: none; border: none; cursor: pointer; color: #000; }
.menu-items a { display: block; font-family: var(--font-head); font-size: 3rem; font-weight: 700; color: #000; margin: 10px 0; text-transform: uppercase; }
.menu-items a:hover { color: #fff; }

/* --- Parallax Hero --- */
.parallax-hero {
    height: 100vh;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    align-items: center;
    position: relative;
}
.parallax-hero::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.4); }

.hero-content { position: relative; z-index: 2; margin-left: 10%; max-width: 800px; }
.tag-yellow { background: var(--color-yellow); color: #000; padding: 5px 10px; font-weight: 800; font-family: var(--font-head); letter-spacing: 2px; display: inline-block; margin-bottom: 20px; }
.hero-content h1 { font-family: var(--font-head); font-size: 5rem; line-height: 0.9; margin-bottom: 20px; text-transform: uppercase; }
.hero-content p { font-size: 1.2rem; color: #ddd; max-width: 500px; }

.scroll-indicator { position: absolute; bottom: 40px; left: 10%; display: flex; flex-direction: column; align-items: center; gap: 10px; font-size: 0.8rem; letter-spacing: 2px; }
.line-down { width: 1px; height: 50px; background: #fff; }

/* --- Blocks --- */
.section-padding { padding: 100px 0; }
.block-text { display: flex; gap: 50px; align-items: flex-start; padding: 100px 0; }
.big-num { font-family: var(--font-head); font-size: 8rem; color: #333; line-height: 0.8; font-weight: 800; }
.text-wrap h2 { font-family: var(--font-head); font-size: 3rem; margin-bottom: 20px; text-transform: uppercase; }
.text-wrap p { font-size: 1.1rem; color: var(--color-grey); }

/* --- Parallax Strip --- */
.parallax-strip {
    height: 400px;
    background-attachment: fixed;
    background-position: center;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    margin: 50px 0;
}
.parallax-strip::before { content: ''; position: absolute; top:0; left:0; width:100%; height:100%; background: rgba(0,0,0,0.6); }
.strip-content { position: relative; z-index: 2; }
.strip-content h3 { font-family: var(--font-head); font-size: 3rem; margin-bottom: 10px; }
.btn-outline { border: 2px solid #fff; padding: 10px 30px; font-weight: bold; display: inline-block; margin-top: 20px; }
.btn-outline:hover { background: #fff; color: #000; }

/* --- Grid --- */
.block-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid-item { background: var(--bg-concrete); padding: 40px; border-bottom: 4px solid transparent; transition: 0.3s; }
.grid-item:hover { border-bottom-color: var(--color-yellow); background: #333; }
.icon-big { font-size: 3rem; margin-bottom: 20px; }
.grid-item h4 { font-family: var(--font-head); font-size: 1.5rem; margin-bottom: 10px; text-transform: uppercase; }

/* --- About & Engineering --- */
.page-header { padding: 150px 0 50px; text-align: center; background: #111; }
.page-header h1 { font-family: var(--font-head); font-size: 4rem; text-transform: uppercase; color: var(--color-white); letter-spacing: 3px; }

.engineering-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.eng-text h3 { font-family: var(--font-head); font-size: 2.5rem; margin-bottom: 20px; color: var(--color-yellow); }
.stats-row { display: flex; gap: 40px; margin-top: 40px; }
.stat strong { font-family: var(--font-head); font-size: 3rem; display: block; line-height: 1; }
.stat span { color: var(--color-grey); font-size: 0.9rem; }
.eng-img { position: relative; }
.img-overlay { position: absolute; bottom: 0; left: 0; background: var(--color-yellow); color: #000; padding: 10px 20px; font-weight: bold; font-family: var(--font-head); }

/* --- Partners --- */
.partners-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.partner-card { border: 1px solid #333; padding: 40px; }
.p-logo { font-family: var(--font-head); font-size: 1.5rem; font-weight: 800; color: var(--color-yellow); margin-bottom: 15px; }
.project-name { display: block; margin-top: 20px; font-size: 0.8rem; color: var(--color-grey); text-transform: uppercase; letter-spacing: 1px; }

/* --- Contact Split --- */
.split-screen-contact { display: grid; grid-template-columns: 1fr 1fr; min-height: 100vh; }
.contact-info-panel { background: #111; padding: 100px 50px; display: flex; flex-direction: column; justify-content: center; }
.contact-info-panel h2 { font-family: var(--font-head); font-size: 3rem; margin-bottom: 10px; }
.address-box { margin-top: 50px; border-left: 2px solid var(--color-yellow); padding-left: 20px; }
.address-box strong { color: var(--color-yellow); font-family: var(--font-head); letter-spacing: 1px; }

.contact-form-panel { background: var(--bg-concrete); padding: 100px 50px; display: flex; flex-direction: column; justify-content: center; }
.input-group { margin-bottom: 20px; }
.input-group label { display: block; margin-bottom: 5px; color: var(--color-grey); font-size: 0.8rem; }
.input-group input, .input-group select, .input-group textarea { width: 100%; background: #222; border: 1px solid #444; color: #fff; padding: 15px; font-family: var(--font-body); }
.input-group input:focus { border-color: var(--color-yellow); outline: none; }
.btn-block-yellow { width: 100%; background: var(--color-yellow); color: #000; padding: 15px; border: none; font-weight: 800; font-family: var(--font-head); cursor: pointer; text-transform: uppercase; }
.btn-block-yellow:hover { background: #fff; }

/* --- Policy --- */
.policy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.policy-item { background: #222; padding: 30px; border-top: 2px solid var(--color-grey); }
.policy-item h3 { font-family: var(--font-head); color: var(--color-white); margin-bottom: 10px; font-size: 1.5rem; }

/* --- Footer --- */
.dark-footer { background: #000; padding: 50px 0; border-top: 1px solid #222; margin-top: auto; }
.footer-flex { display: flex; justify-content: space-between; align-items: center; }
.f-left h4 { font-family: var(--font-head); color: var(--color-white); }
.f-right a { margin-left: 20px; color: var(--color-grey); font-size: 0.9rem; }
.f-right a:hover { color: var(--color-yellow); }

@media (max-width: 992px) {
    .top-nav { display: none; }
    .menu-icon { display: flex; }
    .hero-content h1 { font-size: 3rem; }
    .block-text, .engineering-layout, .partners-grid, .split-screen-contact, .policy-grid { grid-template-columns: 1fr; flex-direction: column; }
    .parallax-hero { background-attachment: scroll; } /* Mobile parallax fix */
    .block-grid { grid-template-columns: 1fr; }
    .contact-info-panel, .contact-form-panel { padding: 50px 20px; }
}