:root {
    /*--primary-blue: #03a9f4;*/
    --primary-blue: #0066cc;
    --dark-navy: #17252a;
    --bg-gray: #f8f9fa;
    --white: #ffffff;
    --border: #eef1f4;
}

body {
    margin: 0;
    font-family: 'Kanit', sans-serif;
    background-color: var(--bg-gray);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }

/* Header */
.project-header {
    /*background: linear-gradient(135deg, var(--dark-navy) 0%, #223a45 100%);
    padding: 80px 0;
    color: white;
    text-align: center;*/
    background: linear-gradient(rgba(0,51,102,0.8), rgba(0,51,102,0.8)), 
                url('../image/mainpage/hero.jpg');
    background-size: cover;
    background-position: center;
    padding: 100px 0;
    text-align: center;
    color: white;
}

.sub-title { color: var(--primary-blue); font-weight: 600; text-transform: uppercase; letter-spacing: 2px; }
.project-header h1 { font-size: 2.5rem; margin-top: 10px; }

/* Filter */
.client-filter {
    background: white;
    padding: 20px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.filter-wrapper {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-btn {
    border: 1px solid var(--border);
    background: white;
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.filter-btn img { height: 30px; filter: grayscale(100%); opacity: 0.6; transition: 0.3s; }
.filter-btn:hover, .filter-btn.active { border-color: var(--primary-blue); background: #f0faff; }
.filter-btn.active img, .filter-btn:hover img { filter: grayscale(0%); opacity: 1; }

/* Search */
.search-section { padding: 40px 0 20px; }
.search-box {
    background: white;
    display: flex;
    align-items: center;
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
}

.search-box i { color: #ccc; margin-right: 15px; }
.search-box input {
    border: none;
    outline: none;
    width: 100%;
    font-size: 1rem;
    font-family: inherit;
}

/* Category Blocks */
.category-block { margin-bottom: 60px; }
.cat-title {
    font-size: 1.5rem;
    color: var(--dark-navy);
    border-left: 5px solid var(--primary-blue);
    padding-left: 15px;
    margin-bottom: 30px;
}

.project-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.p-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    border-bottom: 3px solid transparent;
    transition: 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.p-card:hover { transform: translateY(-5px); border-color: var(--primary-blue); box-shadow: 0 10px 25px rgba(0,0,0,0.08); }
.p-client { font-weight: 600; color: var(--primary-blue); margin-bottom: 10px; font-size: 0.9rem; }
.p-card p { color: #555; font-size: 1rem; line-height: 1.5; margin-bottom: 15px; }
.p-tag { font-size: 0.75rem; background: #eee; padding: 4px 10px; border-radius: 4px; color: #777; }

/* Responsive */
@media (max-width: 768px) {
    .project-cards { grid-template-columns: 1fr; }
    .filter-btn { padding: 8px 15px; }
}