:root {
    /* Dark Theme (Default) */
    --bg-color: #0d1117;
    --sidebar-bg: #161b22;
    --card-bg: #161b22;
    --card-hover-bg: #1f2428;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-color: #238636;
    --accent-hover: #2ea043;
    --accent-text: #3fb950;
    --border-color: #30363d;
    --glow-color: rgba(63, 185, 80, 0.4);
    
    --header-height: 70px;
    --sidebar-width: 260px;
    --transition-speed: 0.3s;
    --border-radius: 8px;
}

[data-theme="light"] {
    --bg-color: #f6f8fa;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --card-hover-bg: #f3f4f6;
    --text-main: #24292f;
    --text-muted: #57606a;
    --accent-color: #2da44e;
    --accent-hover: #2c974b;
    --accent-text: #1a7f37;
    --border-color: #d0d7de;
    --glow-color: rgba(45, 164, 78, 0.2);
}

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

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

h1, h2, h3, h4, h5, h6, .search-input, .code-font {
    font-family: 'Fira Code', monospace;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
    font-family: inherit;
}

/* Layout */
.layout {
    display: flex;
    min-height: 100vh;
    padding-top: var(--dynamic-header-height, var(--header-height));
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--dynamic-header-height, var(--header-height));
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition-speed);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 20px 0;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section h3 {
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 0 20px;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 20px;
    flex-grow: 1;
    word-break: break-word; /* Fixes horizontal stretching issues on unbreakable text */
}

/* Card Input UI */
.card-input-wrapper {
    position: relative;
    z-index: 2;
    margin-top: 15px;
}

.card-input {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: var(--border-radius);
    outline: none;
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color var(--transition-speed);
}

.card-input:focus {
    border-color: var(--accent-color);
}

.animated-list {
    list-style: none;
}

.category-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    color: var(--text-main);
    font-size: 0.95rem;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.category-link:hover {
    background-color: var(--card-hover-bg);
    color: var(--accent-text);
}

.category-link.active {
    background-color: var(--card-hover-bg);
    border-left-color: var(--accent-color);
    color: var(--accent-text);
}

.category-link span {
    background-color: var(--border-color);
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
}

.category-link.active span {
    background-color: var(--accent-color);
    color: #fff;
}

.favorites-link {
    color: #e3b341 !important;
}
.favorites-link.active span {
    background-color: #e3b341;
}

/* Header Logo Toggle */
.header-logo {
    display: block;
    font-size: 1.1rem;
    color: var(--accent-text);
    text-shadow: 0 0 10px var(--glow-color);
    font-family: 'Fira Code', monospace;
    margin-right: 20px;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.header-logo:hover {
    color: var(--accent-hover);
    transform: scale(1.02);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - var(--header-height));
    transition: margin-left var(--transition-speed);
}

.main-content.expanded {
    margin-left: 0;
}

.main-header {
    min-height: var(--header-height);
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px 40px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 200;
}

.header-top-row {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 300px;
}

.search-container {
    position: relative;
    max-width: 400px;
    flex: 1;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

#search-input {
    width: 100%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px 10px 10px 42px;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

#search-input::placeholder {
    color: var(--text-muted);
}

#search-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}

.content-body {
    padding: 40px;
    flex: 1;
}

.filter-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-items: center;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-muted);
    transition: all 0.2s;
}

.theme-toggle:hover {
    background-color: var(--card-hover-bg);
    color: var(--accent-text);
}

.control-select {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}

.control-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}

.content-header {
    margin-bottom: 30px;
    display: flex;
    align-items: baseline;
    gap: 15px;
}

.content-header h2 {
    font-size: 1.8rem;
    color: var(--text-main);
}

.no-results p {
    color: var(--text-muted);
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding: 4px 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.sidebar-donate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 100%;
    background-color: #0070ba;
    color: #ffffff !important;
    padding: 4px 8px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.7rem;
    opacity: 0.65;
    transition: opacity 0.2s, transform 0.2s;
    border: none;
}

.sidebar-donate-btn:hover {
    opacity: 1;
    transform: translateY(-2px);
    color: #ffffff !important;
}

.sidebar-contact-link {
    color: var(--text-muted);
    font-size: 0.55rem;
    opacity: 0.7;
    text-decoration: none;
    transition: color 0.2s, opacity 0.2s;
}

.sidebar-contact-link:hover {
    color: var(--accent-color);
    opacity: 1;
    text-decoration: underline;
}

.sidebar-donate-btn svg {
    color: #ffffff;
}

.results-count {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Grid Layout */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

/* Tool Card */
.tool-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-speed);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: var(--accent-color);
    background-color: var(--card-hover-bg);
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card[data-theme="light"]:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

/* Base class fallback for hover */
[data-theme="light"] .tool-card:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-text);
    text-decoration: none;
    font-family: 'Fira Code', monospace;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.card-title:hover {
    text-decoration: underline;
}

.card-title::after {
    content: '↗';
    font-size: 0.8em;
    opacity: 0.5;
}

.fav-btn {
    color: var(--text-muted);
    transition: all 0.2s;
    padding: 4px;
    border-radius: 4px;
    position: relative;
    z-index: 2;
}

.fav-btn:hover {
    color: #e3b341;
    background-color: rgba(227, 179, 65, 0.1);
}

.fav-btn.active {
    opacity: 0.5;
}

.card-badges {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.card-category, .card-payment {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 2px 8px;
    border-radius: 12px;
}

.card-category {
    color: var(--text-muted);
    background-color: var(--border-color);
}

.card-payment {
    font-weight: 600;
}

.payment-free {
    color: #4ade80;
    background-color: rgba(74, 222, 128, 0.1);
}

.payment-partly-free {
    color: #60a5fa;
    background-color: rgba(96, 165, 250, 0.1);
}

.payment-paid {
    color: #f87171;
    background-color: rgba(248, 113, 113, 0.1);
}

.card-description {
    color: var(--text-main);
    font-size: 0.9rem;
    flex: 1;
}

.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.no-results svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 1100px) {
    .filter-controls {
        width: 100%;
        justify-content: flex-start;
        padding-bottom: 5px;
        flex-wrap: wrap;
    }
}

@media (max-width: 1024px) {
    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 260px;
        top: var(--header-height);
        border-right: 1px solid var(--border-color);
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
    }

    .main-content {
        margin-left: 0;
    }
    
    .main-header {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .header-top-row {
        width: 100%;
        min-width: 100%;
    }
    
    .header-logo {
        font-size: 1rem;
        margin-right: 12px;
    }
    
    .control-select {
        flex: 1 1 40%;
        min-width: 100px;
    }
    
    .content-body {
        padding: 20px;
    }
    
    .content-body .filter-controls {
        margin-bottom: 25px;
    }
    
    .sidebar .sidebar-header {
        padding-left: 20px;
    }
}