@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-color-rgb: 255, 255, 255;
    --bg-color: rgb(var(--bg-color-rgb));
    --text-color: #1a1a1a;
    --accent-color: #888888;
    --border-color: #eeeeee;
    --secondary-bg: #f9f9f9;
    --card-bg: #ffffff;
    --header-height: 80px;
    --container-width: 1000px;
    --content-width: 700px;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-color-rgb: 0, 0, 0;
    --bg-color: rgb(var(--bg-color-rgb));
    --text-color: #f5f5f5;
    --accent-color: #888888;
    --border-color: #222222;
    --secondary-bg: #111111;
    --card-bg: #0a0a0a;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition-speed);
}

a:hover {
    opacity: 0.7;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.content-container {
    max-width: var(--content-width);
    margin: 0 auto;
}

/* Header */
header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: rgba(var(--bg-color-rgb), 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

nav ul {
    display: flex;
    gap: 30px;
}

nav ul li {
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px;
    border-radius: 50%;
    transition: background-color var(--transition-speed);
}

.theme-toggle:hover {
    background-color: var(--secondary-bg);
}

/* Hero Section */
.hero {
    padding: 100px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero p {
    font-size: 1.2rem;
    color: var(--accent-color);
}

/* Blog List */
.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 40px;
    padding: 60px 0;
}

.post-card {
    display: flex;
    flex-direction: column;
    gap: 15px;
    opacity: 0;
    transform: translateY(20px);
    transition: transform 0.5s, opacity 0.5s;
}

.post-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.post-card:hover {
    transform: translateY(-5px);
}

.post-thumbnail {
    aspect-ratio: 16/9;
    background-color: var(--secondary-bg);
    border-radius: 8px;
    overflow: hidden;
}

.post-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-speed);
}

.post-card:hover .post-thumbnail img {
    transform: scale(1.05);
}

.post-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-color);
    letter-spacing: 1px;
}

.post-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
}

.post-excerpt {
    font-size: 0.95rem;
    color: var(--accent-color);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-meta {
    font-size: 0.8rem;
    color: var(--accent-color);
}

/* Post Detail */
.post-header {
    padding: 80px 0 40px;
    text-align: center;
}

.post-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -1.5px;
}

.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content p {
    margin-bottom: 25px;
}

.post-content img {
    border-radius: 12px;
    margin: 40px 0;
}

.post-content h2,
.post-content h3 {
    margin: 40px 0 20px;
}

/* Footer */
footer {
    padding: 80px 0 40px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 100px;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.copyright {
    font-size: 0.85rem;
    color: var(--accent-color);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 1s ease-in-out;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .post-header h1 {
        font-size: 2.2rem;
    }

    nav ul {
        display: none;
        /* Hide for now, can implement mobile menu later */
    }
}