:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f5f5f5;
    --card-bg: #ffffff;
    --text: #333;
    --text-muted: #7f8c8d;
    --text-bright: #ffffff;
    --border: #ddd;
    --hero-bg: #3498db;
    --footer-bg: white;
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

body.dark-mode {
    --bg: #0a0e14;
    --card-bg: #151c26;
    --text: #ffffff;
    --text-muted: #b0b0b0;
    --border: #30363d;
    --hero-bg: #151c26;
    --footer-bg: #0d1117;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* For compatibility with existing details page logic */
body.details-page {
    background-color: var(--bg);
    color: var(--text);
}

/* Override the default dark feel of details page when NOT in dark mode */
body.details-page:not(.dark-mode) {
    --bg: #f5f5f5;
    --text: #333;
    --card-bg: #ffffff;
    --text-muted: #7f8c8d;
    --border: #ddd;
    --hero-bg: #3498db;
    --footer-bg: white;
}

/* Ensure project details look right in dark mode */
body.details-page.dark-mode {
    --bg: #0a0e14;
    --text: #ffffff;
    --card-bg: #151c26;
    --text-muted: #b0b0b0;
    --border: #30363d;
    --hero-bg: #151c26;
    --footer-bg: #0d1117;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--primary);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

nav ul { display: flex; list-style: none; }
nav ul li { margin-left: 1.5rem; }
nav ul li a { color: white; text-decoration: none; font-weight: 500; transition: var(--transition); }
nav ul li a:hover { color: var(--accent); }

/* Hero */
.hero {
    padding: 100px 0;
    text-align: center;
    background-color: var(--hero-bg);
    color: white;
    transition: background-color 0.3s;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.hero h1 span {
    color: var(--primary);
}

body.dark-mode .hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

/* Search Bar */
.search-container {
    position: relative;
    margin: 0 auto;
    max-width: 500px;
    width: 100%;
}

.search-input {
    padding: 12px 15px 12px 45px;
    border-radius: 30px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    outline: none;
    width: 100%;
    box-sizing: border-box;
    transition: all 0.3s;
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    font-size: 16px;
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.8);
}

.search-input:focus {
    background-color: white;
    color: #333;
    width: 100%;
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.search-input:focus::placeholder {
    color: #999;
}

.search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    pointer-events: none;
    transition: color 0.3s;
}

.search-input:focus + .search-icon {
    color: var(--accent);
}

/* Filters */
.filters { padding: 2rem 0; background: var(--card-bg); border-bottom: 1px solid var(--border); transition: background-color 0.3s; }
.filter-group { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.filter-btn {
    padding: 0.7rem 1.8rem;
    border-radius: 30px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

/* Bento Grid */
.grid-section { padding: 4rem 0; }
.bento-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    grid-auto-rows: 250px;
    grid-auto-flow: dense;
    gap: 1.5rem;
}

.bento-item {
    background: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.bento-item.large { grid-column: span 2; grid-row: span 2; }
.bento-item.medium { grid-row: span 2; }

.bento-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.item-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.bento-item:hover .item-img { transform: scale(1.05); }

.item-overlay {
    position: absolute;
    bottom: 0; left: 0; width: 100%;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    z-index: 2;
}

.item-overlay h3 { font-size: 1.4rem; margin-bottom: 0.3rem; }
.item-overlay p { font-size: 0.9rem; opacity: 0.8; }

/* Detail Page Content */
.project-detail-content { padding: 5rem 0; }
.detail-hero { margin-bottom: 4rem; text-align: center; }
.detail-hero h1 { font-size: 4rem; margin-bottom: 1rem; color: var(--accent); }
.detail-category { text-transform: uppercase; letter-spacing: 2px; font-weight: 700; opacity: 0.7; }

.detail-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.detail-image-container img {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}

.detail-story h2 { font-size: 1.2rem; color: var(--accent); margin-bottom: 0.5rem; text-transform: uppercase; }
.detail-story p { font-size: 1.15rem; line-height: 1.8; margin-bottom: 2.5rem; opacity: 0.9; }

.detail-tech { display: flex; flex-wrap: wrap; gap: 0.8rem; margin: 2rem 0; }
.tech-pill { background: rgba(255,255,255,0.1); padding: 0.6rem 1.2rem; border-radius: 10px; font-weight: 500; }

.detail-actions { display: flex; gap: 1.5rem; margin-top: 3rem; }
.btn-main { background: var(--accent); color: white; padding: 1.2rem 2.5rem; border-radius: 15px; text-decoration: none; font-weight: 700; transition: var(--transition); }
.btn-main:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(52, 152, 219, 0.4); }

/* Footer */
footer { padding: 3rem 0; text-align: center; background: var(--footer-bg); border-top: 1px solid var(--border); transition: background-color 0.3s; }

/* Responsive */
@media (max-width: 1024px) {
    .detail-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.5rem; }
}

@media (max-width: 768px) {
    .bento-grid { grid-template-columns: 1fr; }
    .bento-item.large, .bento-item.medium { grid-column: span 1; grid-row: span 1; }
}