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

:root {
    /* Colors */
    --clr-primary: #e31c25;
    /* Crimson */
    --clr-secondary: #7b1fa2;
    /* Purple */
    --clr-bg: #0f0f0f;
    /* Dark */
    --clr-surface: rgba(255, 255, 255, 0.05);
    /* Glass Background */
    --clr-surface-hover: rgba(255, 255, 255, 0.1);
    --clr-text: #ffffff;
    --clr-text-muted: #a0a0a0;
    --clr-border: rgba(255, 255, 255, 0.1);
    --clr-accent-glow: rgba(227, 28, 37, 0.3);

    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;

    /* Shadows & Effects */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --glass-blur: blur(12px);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--clr-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--clr-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--clr-primary);
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: clamp(240px, 20vw, 320px);
    height: 100vh;
    position: sticky;
    top: 0;
    background: rgba(15, 15, 15, 0.8);
    backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--clr-border);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-logo span {
    color: var(--clr-primary);
}

.sidebar-nav {
    flex: 1;
}

.nav-category {
    margin-bottom: var(--space-lg);
}

.nav-category-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: var(--clr-text-muted);
    margin-bottom: var(--space-md);
}

.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--clr-text);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    transition: var(--transition);
}

.nav-link:hover {
    background: var(--clr-surface);
    color: var(--clr-primary);
}

.nav-link.active {
    background: var(--clr-primary);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--space-xl) var(--space-lg);
    max-width: clamp(600px, 90%, 1200px);
    margin: 0 auto;
    width: 100%;
}

/* Hero Section */
.hero {
    margin-bottom: var(--space-xl);
    text-align: center;
    position: relative;
    padding: var(--space-xl) 0;
}

.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: var(--clr-primary);
    filter: blur(100px);
    opacity: 0.2;
    z-index: -1;
}

.hero h1 {
    font-size: clamp(2rem, 8vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    max-width: clamp(300px, 80%, 660px);
    margin: 0 auto;
}

/* Search Container */
.search-container {
    margin: var(--space-xl) 0;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--clr-primary);
    box-shadow: 0 0 0 4px var(--clr-accent-glow);
}

/* FAQ Sections */
.faq-section {
    margin-bottom: var(--space-xl);
}

.section-title {
    font-size: 1.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-header {
    width: 100%;
    padding: var(--space-md) 0;
    background: transparent;
    border: none;
    color: white;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--clr-border);
    margin-bottom: var(--space-lg);
    transition: var(--transition);
}

.category-header:hover {
    border-color: var(--clr-primary);
}

.category-icon {
    font-size: 1.25rem;
    transition: var(--transition);
    opacity: 0.5;
}

.faq-section.expanded .category-icon {
    transform: rotate(180deg);
    opacity: 1;
    color: var(--clr-primary);
}

.category-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.faq-section.expanded .category-content {
    max-height: 10000px;
    /* High enough to contain multiple accordions */
}

/* Accordion */
.accordion-item {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: 12px;
    margin-bottom: var(--space-md);
    overflow: hidden;
    transition: var(--transition);
}

.accordion-header {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    color: white;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-header:hover {
    background: var(--clr-surface-hover);
}

.accordion-icon {
    transition: var(--transition);
    opacity: 0.5;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
    opacity: 1;
    color: var(--clr-primary);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.accordion-item.active .accordion-content {
    max-height: 3000px;
    /* Adjust as needed */
}

.accordion-inner {
    padding: 0 1.5rem 1.5rem;
    color: var(--clr-text-muted);
}

.accordion-inner p {
    margin-bottom: var(--space-md);
}

.accordion-inner code {
    background: rgba(227, 28, 37, 0.15);
    color: var(--clr-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9em;
    border: 1px solid rgba(227, 28, 37, 0.3);
}

.accordion-inner h4 {
    border-left: 3px solid var(--clr-primary);
    padding-left: var(--space-md);
    background: linear-gradient(90deg, rgba(227, 28, 37, 0.1) 0%, transparent 100%);
    padding-top: 5px;
    padding-bottom: 5px;
}

.accordion-inner ul,
.accordion-inner ol {
    padding-left: 1.5rem;
    margin-bottom: var(--space-md);
}

.accordion-inner li {
    margin-bottom: 0.5rem;
}

.accordion-inner strong {
    color: var(--clr-primary);
    font-weight: 700;
}

.accordion-inner a {
    color: var(--clr-secondary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.accordion-inner a:hover {
    border-bottom-color: var(--clr-secondary);
}

.accordion-inner h4,
.accordion-inner h5 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: white;
    font-size: 1.1rem;
}

.accordion-inner img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: var(--space-md) 0;
    border: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 ratio */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    border-radius: 12px;
    margin: var(--space-md) 0;
    border: 1px solid var(--clr-border);
    box-shadow: var(--shadow-lg);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Loading & Errors */
.loading-spinner {
    padding: var(--space-lg);
    text-align: center;
    color: var(--clr-text-muted);
    font-style: italic;
    opacity: 0.5;
}

.error {
    padding: var(--space-md);
    background: rgba(227, 28, 37, 0.1);
    border: 1px solid var(--clr-primary);
    border-radius: 8px;
    color: var(--clr-primary);
}

/* Footer */
footer {
    padding: var(--space-xl) 0;
    text-align: center;
    border-top: 1px solid var(--clr-border);
    margin-top: var(--space-xl);
}

footer p {
    color: var(--clr-text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: sticky;
        top: 0;
        background: rgba(15, 15, 15, 0.95);
        border-right: none;
        border-bottom: 1px solid var(--clr-border);
        padding: var(--space-md) var(--space-lg);
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .sidebar-logo {
        margin-bottom: 0;
        font-size: 1.2rem;
    }

    .sidebar-nav {
        flex: 0;
    }

    .nav-category {
        margin-bottom: 0;
    }

    .nav-category-title {
        display: none;
    }

    .nav-link {
        display: inline-block;
        margin-bottom: 0;
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .main-content {
        padding: var(--space-lg) var(--space-md);
    }
}

@media (max-width: 640px) {
    .sidebar {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .sidebar-nav {
        width: 100%;
        overflow-x: auto;
        display: flex;
        gap: 0.5rem;
        padding-bottom: 0.25rem;
    }

    .nav-link {
        white-space: nowrap;
    }
}