/* Modern CSS for Essiplus Manual v2.0 */
:root {
    /* Day Mode (Default) */
    --primary-color: #0066cc;
    --primary-light: #e6f7ff;
    --bg-color: #f5f7f9;
    --card-bg: #ffffff;
    --text-color: #3b454e;
    --heading-color: #242a31;
    --sidebar-bg: #ffffff;
    --sidebar-border: #e6ecf1;
    --border-color: #e6ecf1;
    --highlight-color: #fff566;
    /* Yellow for search */
    --code-bg: #f8f9fa;
    --sidebar-width: 280px;
    --header-height: 60px;
}

[data-theme="dark"] {
    /* Night Mode */
    --primary-color: #4da6ff;
    --primary-light: #182a3d;
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --heading-color: #ffffff;
    --sidebar-bg: #242424;
    --sidebar-border: #333333;
    --border-color: #404040;
    --highlight-color: #bfa300;
    /* Darker yellow */
    --code-bg: #333333;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    display: flex;
    height: 100vh;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* --- PIN Overlay --- */
#pin-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.pin-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 340px;
    width: 90%;
    border: 1px solid var(--border-color);
}

.pin-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

#pin-input {
    width: 100%;
    padding: 12px;
    font-size: 24px;
    text-align: center;
    letter-spacing: 8px;
    margin: 20px 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
}

#pin-submit {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

#pin-submit:hover {
    filter: brightness(1.1);
}

.error-msg {
    color: #ff4d4f;
    margin-top: 15px;
    font-size: 14px;
    min-height: 20px;
}

/* Mobile Header */
.mobile-header {
    display: none;
    /* Hidden on desktop */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--sidebar-bg);
    border-bottom: 1px solid var(--sidebar-border);
    align-items: center;
    padding: 0 16px;
    z-index: 1000;
}

#mobile-menu-btn {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
}

.mobile-brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    margin-left: 12px;
}

/* Sidebar */
aside {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 1100;
    transition: transform 0.3s ease;
}

.brand {
    padding: 24px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand i {
    color: var(--primary-color);
}

.search-container {
    padding: 16px;
    border-bottom: 1px solid var(--sidebar-border);
}

#searchInput {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    transition: all 0.2s;
}

#searchInput:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

nav li a {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    /* Prepare for active state */
}

nav li a:hover {
    background-color: var(--bg-color);
}

nav li a.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
    border-left: 3px solid var(--primary-color);
}

nav li a .icon {
    width: 24px;
    margin-right: 10px;
    text-align: center;
    font-size: 1.1em;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--sidebar-border);
}

.theme-btn {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: 0.2s;
}

.theme-btn:hover {
    background: var(--sidebar-border);
}

/* Main Content */
main {
    flex-grow: 1;
    overflow-y: auto;
    padding: 40px 60px;
    scroll-behavior: smooth;
    max-width: 100%;
    /* Ensure content is centered but respects sidebar */
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

h1.main-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--heading-color);
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 15px;
    display: inline-block;
}

/* Cards for Sections */
section {
    background: var(--card-bg);
    padding: 40px;
    margin-bottom: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s;
}

section:hover {
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.05);
    /* Subtle lift */
}

h2 {
    font-size: 1.8rem;
    color: var(--heading-color);
    margin-top: 0;
    /* Remove top margin since it's start of card */
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

h3 {
    font-size: 1.3rem;
    color: var(--heading-color);
    margin-top: 35px;
    margin-bottom: 15px;
    font-weight: 600;
}

p,
li {
    line-height: 1.7;
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text-color);
}

code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: monospace;
}

mark {
    background-color: var(--highlight-color);
    color: #000;
    padding: 0 2px;
    border-radius: 2px;
}

/* Images */
img.manual-img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    margin: 24px 0;
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
    cursor: zoom-in;
    background: #fff;
    /* Ensure transparency looks right */
}

img.manual-img:hover {
    transform: scale(1.02);
}

/* Alerts updated */
.alert {
    padding: 16px 20px;
    margin: 24px 0;
    border-radius: 8px;
    border-left: 4px solid;
    font-size: 15px;
}

.alert-tip {
    background-color: rgba(64, 169, 255, 0.1);
    border-color: #1890ff;
    color: var(--text-color);
    /* Adaptive text */
}

.alert-important {
    background-color: rgba(255, 197, 61, 0.15);
    border-color: #faad14;
    color: var(--text-color);
}

.alert i {
    margin-right: 8px;
    color: inherit;
}

/* Floating Language Selector */
.lang-float {
    position: fixed;
    top: 20px;
    right: 40px;
    background: var(--card-bg);
    padding: 6px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 8px;
    border: 1px solid var(--border-color);
    z-index: 100;
}

.lang-float .lang-btn {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 20px;
    opacity: 0.6;
    transition: 0.2s;
    filter: grayscale(100%);
    padding: 6px;
    border-radius: 6px;
}

.lang-float .lang-btn:hover,
.lang-float .lang-btn.active {
    transform: scale(1.1);
    opacity: 1;
    filter: grayscale(0%);
    background-color: var(--sidebar-border);
}

/* Lightbox */
.lightbox {
    background-color: rgba(0, 0, 0, 0.9);
    /* Always dark */
    backdrop-filter: blur(5px);
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox img {
    max-width: 90%;
    max-height: 90%;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    border-radius: 6px;
}

.close-lightbox {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 3rem;
    color: #fff;
    cursor: pointer;
    opacity: 0.8;
}

.close-lightbox:hover {
    opacity: 1;
}

/* Overlay for Mobile Sidebar */
#sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1050;
    opacity: 0;
    transition: opacity 0.3s;
}

#sidebar-overlay.active {
    display: block;
    opacity: 1;
}


/* Responsiveness */
@media (max-width: 768px) {
    body {
        flex-direction: column;
        padding-top: var(--header-height);
        /* Make space for header */
    }

    /* Mobile Header */
    .mobile-header {
        display: flex;
    }

    /* Sidebar Off-Canvas */
    aside {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        transform: translateX(-100%);
        /* Closed by default */
        box-shadow: 4px 0 15px rgba(0, 0, 0, 0.1);
    }

    aside.open {
        transform: translateX(0);
        /* Slide in */
    }

    .brand {
        display: none;
        /* Hide brand in sidebar on mobile (it's in header) */
    }

    /* Main Content */
    main {
        padding: 20px 16px;
    }

    section {
        padding: 20px;
        /* Smaller padding on mobile cards */
    }

    h1.main-title {
        font-size: 1.8rem;
    }

    /* Language Float - Move slightly */
    .lang-float {
        top: 10px;
        right: 10px;
        z-index: 1001;
        /* Above mobile header */
        background: transparent;
        box-shadow: none;
        border: none;
    }
}