/* Import programmer-vibe Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Fira+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400;500;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* Base Reset & Core Tokens */
:root {
    /* M3 Light Palette (Teal / Blue-Grey) */
    --md-sys-color-primary: #006685;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #bee9ff;
    --md-sys-color-on-primary-container: #001f2d;
    --md-sys-color-secondary: #4d616c;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #d0e5f2;
    --md-sys-color-on-secondary-container: #0a1d27;
    --md-sys-color-background: #f8fafd;
    --md-sys-color-surface: #ffffff;
    --md-sys-color-surface-container: #f0f4f8;
    --md-sys-color-on-surface: #191c1e;
    --md-sys-color-on-surface-variant: #40484c;
    --md-sys-color-outline: #70787d;
    --md-sys-color-outline-variant: #c0c8cc;
    --md-sys-color-error: #ba1a1a;
    --md-sys-color-on-error: #ffffff;

    /* Typographic Families */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Fira Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Transition Motions */
    --motion-duration-short: 150ms;
    --motion-duration-medium: 300ms;
    --motion-easing-standard: cubic-bezier(0.2, 0.0, 0, 1.0);
}

[data-theme="dark"] {
    /* M3 Dark Palette */
    --md-sys-color-primary: #82d0f5;
    --md-sys-color-on-primary: #003547;
    --md-sys-color-primary-container: #004d65;
    --md-sys-color-on-primary-container: #bee9ff;
    --md-sys-color-secondary: #b5c9d6;
    --md-sys-color-on-secondary: #1f333d;
    --md-sys-color-secondary-container: #354954;
    --md-sys-color-on-secondary-container: #d0e5f2;
    --md-sys-color-background: #0f1214;
    --md-sys-color-surface: #191c1e;
    --md-sys-color-surface-container: #222629;
    --md-sys-color-on-surface: #e1e2e5;
    --md-sys-color-on-surface-variant: #bfc8cc;
    --md-sys-color-outline: #8a9297;
    --md-sys-color-outline-variant: #40484c;
    --md-sys-color-error: #ffb4ab;
    --md-sys-color-on-error: #690005;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-surface);
    line-height: 1.6;
    transition: background-color var(--motion-duration-medium) var(--motion-easing-standard), 
                color var(--motion-duration-medium) var(--motion-easing-standard);
    min-height: 100vh;
    padding-bottom: 80px;
}

/* Base Headings & Code Elements */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--md-sys-color-on-surface);
}

a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
    transition: color var(--motion-duration-short) var(--motion-easing-standard);
}

a:hover {
    text-decoration: underline;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-primary);
    padding: 2px 6px;
    border-radius: 4px;
}

pre {
    background-color: var(--md-sys-color-surface-container);
    padding: 16px;
    border-radius: 12px;
    overflow-x: auto;
    border: 1px solid var(--md-sys-color-outline-variant);
    margin: 16px 0;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--md-sys-color-on-surface);
    font-size: 0.85em;
    line-height: 1.5;
}

/* Layout Utilities */
.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Component */
.site-header {
    padding: 48px 0 32px 0;
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    margin-bottom: 32px;
}

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

.profile-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.avatar {
    width: 64px;
    height: 64px;
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px; /* Material shapes */
    border: 2px solid var(--md-sys-color-primary);
    user-select: none;
}

.author-title {
    font-size: 28px;
    line-height: 1.2;
    margin-bottom: 4px;
}

.author-title code {
    font-size: 0.6em;
    vertical-align: middle;
    margin-left: 8px;
}

.author-bio {
    font-size: 16px;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 8px;
}

.social-links {
    display: flex;
    gap: 12px;
    font-family: var(--font-mono);
    font-size: 14px;
}

/* Theme Switcher Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard), 
                border-color var(--motion-duration-short) var(--motion-easing-standard);
}

.theme-toggle:hover {
    background-color: var(--md-sys-color-surface-container);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* Filter Chips (M3 Standard) */
.filter-container {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.filter-chip {
    background-color: transparent;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface);
    padding: 6px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard),
                border-color var(--motion-duration-short) var(--motion-easing-standard);
}

.filter-chip:hover {
    background-color: var(--md-sys-color-surface-container);
}

.filter-chip.active {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-color: var(--md-sys-color-primary);
}

/* Post Cards */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.post-card {
    background-color: var(--md-sys-color-surface);
    border-radius: 16px;
    padding: 24px;
    transition: transform var(--motion-duration-medium) var(--motion-easing-standard),
                box-shadow var(--motion-duration-medium) var(--motion-easing-standard),
                border-color var(--motion-duration-medium) var(--motion-easing-standard);
    border: 1px solid var(--md-sys-color-outline-variant);
    position: relative;
    overflow: hidden;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-color: var(--md-sys-color-outline);
}

/* Outlined for blog posts, Tonal/Filled for micro posts */
.post-card.card-blog {
    border-style: solid;
}

.post-card.card-micro {
    background-color: var(--md-sys-color-surface-container);
    border-style: dashed;
}

.post-meta {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.post-type-tag {
    text-transform: uppercase;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 10px;
}

.card-blog .post-type-tag {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.card-micro .post-type-tag {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

.post-title {
    font-size: 22px;
    margin-bottom: 12px;
    line-height: 1.3;
}

.post-title a {
    color: var(--md-sys-color-on-surface);
}

.post-title a:hover {
    color: var(--md-sys-color-primary);
    text-decoration: none;
}

.post-content {
    font-size: 16px;
    color: var(--md-sys-color-on-surface);
}

.post-content p {
    margin-bottom: 12px;
}

.post-content p:last-child {
    margin-bottom: 0;
}

.post-content blockquote {
    border-left: 4px solid var(--md-sys-color-primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--md-sys-color-on-surface-variant);
    font-style: italic;
}

.post-content ul, .post-content ol {
    margin: 12px 0 12px 20px;
}

.post-content li {
    margin-bottom: 4px;
}

.post-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 16px 0;
    border: 1px solid var(--md-sys-color-outline-variant);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.post-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    background-color: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface-variant);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--md-sys-color-outline-variant);
}

/* Load More Button (Outlined Button M3 style) */
.load-more-container {
    display: flex;
    justify-content: center;
    margin-top: 40px;
}

.btn-load-more {
    font-family: var(--font-mono);
    background-color: transparent;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-primary);
    padding: 12px 28px;
    border-radius: 100px; /* Pill shape */
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard),
                box-shadow var(--motion-duration-short) var(--motion-easing-standard);
}

.btn-load-more:hover {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-color: var(--md-sys-color-primary);
}

.btn-load-more:active {
    box-shadow: 0 0 0 2px var(--md-sys-color-primary);
}

.btn-load-more:disabled {
    color: var(--md-sys-color-outline);
    border-color: var(--md-sys-color-outline-variant);
    cursor: not-allowed;
    background: transparent;
}

/* Single Post Detail Page */
.post-detail-header {
    margin-bottom: 24px;
}

.post-detail-header h1 {
    font-size: 36px;
    line-height: 1.2;
    margin-bottom: 16px;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 14px;
    margin-bottom: 24px;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
}

.btn-back:hover {
    background-color: var(--md-sys-color-surface-container);
    text-decoration: none;
}

/* RSS Icon */
.rss-link {
    display: inline-flex;
    align-items: center;
    color: var(--md-sys-color-on-surface-variant);
}
.rss-link:hover {
    color: var(--md-sys-color-primary);
}
.rss-link svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* Animations for Dynamic Feeding */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.post-card.fade-in {
    animation: fadeInUp var(--motion-duration-medium) var(--motion-easing-standard) forwards;
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    .site-header {
        padding: 32px 0 24px 0;
    }
    
    .header-content {
        flex-direction: column-reverse;
        gap: 16px;
        align-items: flex-end;
    }
    
    .profile-info {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .theme-toggle {
        align-self: flex-end;
    }

    .author-title {
        font-size: 24px;
    }

    .post-card {
        padding: 16px;
    }
    
    .post-title {
        font-size: 18px;
    }
    
    .post-detail-header h1 {
        font-size: 28px;
    }
}