/* --- SWISS STYLE VARIABLES --- */
:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --accent-color: #e30a17; /* İsviçre/Türk Kırmızısı */
    --grid-line: #e5e5e5;
    --font-stack: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --max-width: 1400px;
    --spacing: 60px;
}

/* --- RESET & TEMEL --- */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    line-height: 1.4;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;900&display=swap');

a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { width: 100%; height: auto; display: block; }

/* --- GRID LAYOUT (SWISS GRID) --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    flex: 1;
}

.grid-wrapper {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    padding: var(--spacing) 0;
}

/* --- HEADER --- */
header {
    padding: 30px 40px;
    border-bottom: 2px solid var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--bg-color);
    z-index: 1000;
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: -1px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon { width: 32px; height: 32px; fill: var(--accent-color); }

.nav-links { display: flex; gap: 40px; }

.nav-links a {
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
    text-decoration: underline;
    text-decoration-thickness: 3px;
    text-underline-offset: 5px;
}

.burger { display: none; cursor: pointer; }
.burger div { width: 30px; height: 4px; background: var(--text-color); margin: 6px 0; }

/* --- TYPOGRAPHY --- */
h1 {
    font-size: 5rem;
    font-weight: 900;
    line-height: 0.9;
    letter-spacing: -2px;
    margin-bottom: 30px;
    text-transform: uppercase;
}

h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 40px;
    line-height: 1.1;
    letter-spacing: -1px;
}

p {
    font-size: 1.2rem;
    margin-bottom: 20px;
    max-width: 60ch;
    font-weight: 400;
}

/* --- COMPONENTS --- */
.btn {
    display: inline-block;
    padding: 15px 40px;
    background-color: var(--accent-color);
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    border: none;
    font-size: 1rem;
    margin-top: 20px;
}

.btn:hover { background-color: var(--text-color); }

.swiss-card {
    border-top: 4px solid var(--text-color);
    padding-top: 20px;
}

/* --- FORM --- */
.form-group { margin-bottom: 30px; }
label { display: block; font-weight: 700; margin-bottom: 10px; text-transform: uppercase; font-size: 0.9rem; }
input, textarea, select {
    width: 100%;
    padding: 20px;
    border: 2px solid #ccc;
    background: #f9f9f9;
    font-family: inherit;
    font-size: 1.1rem;
    border-radius: 0; /* Keskin */
}
input:focus, textarea:focus { outline: none; border-color: var(--accent-color); background: #fff; }

/* --- FOOTER --- */
footer {
    border-top: 2px solid var(--text-color);
    padding: 60px 40px;
    margin-top: auto;
    background: #f4f4f4;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-col h4 {
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.tr-phone {
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
    h1 { font-size: 3.5rem; }
    h2 { font-size: 2.2rem; }
    
    .nav-links {
        display: none;
        position: fixed; top: 80px; left: 0; width: 100%; height: 100vh;
        background: var(--bg-color);
        flex-direction: column; padding: 40px; gap: 30px;
        border-top: 1px solid #ccc;
    }
    .nav-links.active { display: flex; }
    .burger { display: block; }
    
    .grid-wrapper { grid-template-columns: 1fr; }
    .col-span-6, .col-span-4, .col-span-8 { grid-column: span 1; }
    
    header, .container { padding-left: 20px; padding-right: 20px; }
}

/* Grid Utilities */
.col-span-6 { grid-column: span 6; }
.col-span-4 { grid-column: span 4; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }