:root {
    --bg: #ffffff;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --card: #f5f5f7;
    --text: #1d1d1f;
    --sub: #86868b;
    --accent: #0071e3;
    --border-color: #d2d2d7;
}

.dark-mode {
    --bg: #000000;
    --nav-bg: rgba(0, 0, 0, 0.8);
    --card: #1c1c1e;
    --text: #f5f5f7;
    --sub: #a1a1a6;
    --accent: #0a84ff;
    --border-color: #424245;
}

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

body { 
    background-color: var(--bg); 
    color: var(--text); 
    font-family: -apple-system, system-ui, sans-serif; 
    transition: 0.3s; 
    display: flex; 
    flex-direction: column; 
    min-height: 100vh;
}

nav { 
    padding: 15px 0; 
    background: var(--nav-bg); 
    backdrop-filter: blur(20px); 
    border-bottom: 1px solid var(--border-color);
    position: sticky; 
    top: 0; 
    z-index: 1000;
}

.nav-content { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    max-width: 1100px; 
    margin: 0 auto; 
    padding: 0 20px; 
}

.nav-center { display: flex; gap: 25px; }
.nav-right { display: flex; align-items: center; gap: 15px; }

.nav-btn { 
    text-decoration: none; 
    color: var(--text); 
    font-size: 14px; 
    opacity: 0.8; 
    transition: 0.2s; 
}

.nav-btn:hover { opacity: 1; color: var(--accent); }

.login-btn {
    background: var(--accent);
    color: white !important;
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 500;
    opacity: 1 !important;
}

.header-box {
    width: 100%; 
    border-radius: 20px; 
    overflow: hidden;
    margin: 40px 0; 
    border: 1px solid var(--border-color);
    background: var(--card); 
    line-height: 0;
}

.header-box img { 
    width: 100%; 
    height: auto; 
    object-fit: contain; 
}

.hero-split { 
    display: grid; 
    grid-template-columns: 1fr 1.6fr; 
    gap: 20px; 
    margin-bottom: 60px; 
}

.box { 
    border-radius: 20px; 
    padding: 35px; 
    background: var(--card); 
    border: 1px solid var(--border-color); 
}

.ip-box { text-align: center; cursor: pointer; transition: 0.2s; }
.ip-box:hover { border-color: var(--accent); transform: scale(1.01); }

.grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); 
    gap: 30px; 
    margin-top: 20px;
}

.project-card {
    text-decoration: none; 
    color: var(--text); 
    border-radius: 20px;
    background: var(--card); 
    border: 1px solid var(--border-color);
    overflow: hidden; 
    transition: 0.3s;
    display: flex;
    flex-direction: column;
}

.project-card:hover { 
    transform: translateY(-5px); 
    box-shadow: 0 15px 30px rgba(0,0,0,0.1); 
}

.card-img-container {
    width: 100%;
    height: 180px;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

.card-img { 
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
    display: block;
}

.card-txt { padding: 20px; text-align: center; }

footer { 
    margin-top: auto; 
    padding: 60px 0; 
    border-top: 1px solid var(--border-color); 
    background: var(--card); 
    text-align: center; 
}

#theme-toggle {
    background: none; 
    border: 1px solid var(--border-color);
    color: var(--text); 
    padding: 5px 10px; 
    border-radius: 12px;
    cursor: pointer; 
    font-size: 12px;
}