/* ==========================================================================
   CORE LAYOUT & STRUCTURE (NO COLORS)
   ========================================================================== */
:root {
    /* --- DIMENSIONS (Cố định) --- */
    --sidebar-width: 280px;
    --topbar-height: 60px;

    /* --- FONTS (Cố định) --- */
    --font-main: 'Plus Jakarta Sans', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-code: 'Fira Code', 'Consolas', monospace;
    --font-heading: 'Outfit', sans-serif;
    --font-code: 'Fira Code', 'Consolas', monospace;
}

/* TURBO PROGRESS BAR */
.turbo-progress-bar {
    height: 3px;
    background-color: var(--bs-primary);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    transition: width 0.3s ease, opacity 0.3s ease;
}

body {
    display: flex;
    height: 100vh;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
}

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

.logo-text {
    font-family: var(--font-heading);
    font-weight: 900;
    letter-spacing: -0.5px;
}

.text-theme {
    color: var(--text-color) !important;
}

.text-theme-muted {
    color: var(--text-muted) !important;
}

/* Main Wrappers */
.main-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    height: 100vh;
}

.content-container {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
}

/* ==========================================================================
   2. SIDEBAR & NAV
   ========================================================================== */
.sidebar-wrapper {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 1040;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* GPU Hack Base */
    will-change: transform;
}

.nav-link {
    color: var(--text-muted);
    padding: 10px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    margin-bottom: 4px;
}

.nav-link:hover {
    background: rgba(128, 128, 128, 0.1);
    color: var(--text-color);
    transform: translateX(4px);
}

.nav-link.active {
    background: var(--bs-primary);
    color: #fff !important;
    box-shadow: 0 4px 12px rgba(var(--bs-primary-rgb), 0.3);
}

/* History Items */
.history-item {
    display: block;
    padding: 8px 10px;
    color: var(--text-muted);
    border-radius: 6px;
    transition: 0.2s;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.history-item:hover {
    background: rgba(128, 128, 128, 0.1);
    color: var(--text-color);
}

/* Tabs (Segmented) */
.segment-container {
    position: relative;
    background: var(--input-bg);
    border-radius: 10px;
    padding: 4px;
    border: 1px solid var(--border-color);
    display: flex;
}

.segment-glider {
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    background: var(--glider-bg);
    border-radius: 8px;
    z-index: 1;
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.segment-btn {
    flex: 1;
    text-align: center;
    padding: 6px 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    background: transparent;
    border: none;
    z-index: 2;
    cursor: pointer;
    transition: color 0.2s;
}

.segment-btn.active {
    color: #fff;
}

/* ==========================================================================
   3. COMPONENTS (GLASS & UTILS)
   ========================================================================== */
.glass-panel {
    background-color: var(--glass-bg) !important;
    border: 1px solid var(--glass-border) !important;
    color: var(--text-color);
    /* GPU Hack for Ghost UI */
    transform: translateZ(0);
    isolation: isolate;
}

.glass-input {
    background-color: var(--input-bg) !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-color) !important;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.glass-input:focus {
    border-color: var(--bs-primary) !important;
    box-shadow: 0 0 0 0.25rem rgba(var(--bs-primary-rgb), 0.15);
}

.glass-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Spacing Fix for Input Group */
.input-group .glass-input {
    border-left: 0;
    padding-left: 15px !important;
}

.input-group-text {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-right: 0;
}

.glass-toolbar {
    background: var(--input-bg);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* Settings Card (Static Container) */
.theme-card {
    background: var(--sidebar-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* GPU Hack */
    transform: translateZ(0);
    isolation: isolate;
}

.scrollable-card-body {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

.btn-glass {
    background: rgba(128, 128, 128, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.btn-glass:hover {
    background: rgba(128, 128, 128, 0.2);
    color: var(--text-color);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Scrollbar */
.custom-scroll::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.custom-scroll::-webkit-scrollbar-thumb {
    background: var(--scroll-thumb);
    border-radius: 10px;
}

.custom-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.no-scrollbar::-webkit-scrollbar {
    display: none;
}

.no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* ==========================================================================
   4. EDITOR & PREVIEW
   ========================================================================== */
.option-disabled {
    opacity: 0.5;
    pointer-events: none;
    position: relative;
    filter: grayscale(1);
}

.option-disabled::after {
    content: "\F47B";
    font-family: 'bootstrap-icons';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: var(--text-color);
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    z-index: 10;
}

.status-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--sidebar-bg);
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    z-index: 2000;
    display: none;
    align-items: center;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.3s;
}

.status-indicator.show {
    display: flex;
    opacity: 1;
}

.code-block-wrapper {
    position: relative;
    margin: 1rem 0;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--code-bg);
}

.btn-copy-code {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #e2e8f0;
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    opacity: 0.6;
    transition: background-color 0.2s;
    z-index: 10;
}

.code-block-wrapper:hover .btn-copy-code {
    opacity: 1;
}

.btn-copy-code:hover {
    background: var(--bs-primary);
    border-color: var(--bs-primary);
    color: #fff;
}

.rendered-markdown-block {
    padding: 1.5rem;
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.6;
    overflow-x: auto;
}

.rendered-markdown-block h1,
.rendered-markdown-block h2 {
    color: var(--text-theme);
    margin-top: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.rendered-markdown-block strong {
    color: var(--text-theme);
    font-weight: 700;
}

.rendered-markdown-block blockquote {
    border-left: 3px solid var(--bs-primary);
    padding-left: 1rem;
    color: var(--text-muted);
    font-style: italic;
}

.rendered-markdown-block a {
    color: var(--bs-primary);
    text-decoration: underline;
}

#render-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

#render-content blockquote {
    border-left: 4px solid var(--bs-primary);
    padding-left: 1rem;
    margin-left: 0;
    color: var(--text-muted);
}

#render-content pre {
    margin: 0 !important;
    padding: 1rem;
    border: none !important;
}

#render-content code {
    font-family: var(--font-code);
}

.glass-table {
    color: inherit !important;
    border-color: var(--border-color) !important;
}

.glass-table th,
.glass-table td {
    background: transparent !important;
    border-color: var(--border-color) !important;
    color: inherit !important;
}

.resize-none {
    resize: none;
}

#sourceContent:focus {
    box-shadow: none;
}

/* ==========================================================================
   5. RESPONSIVE
   ========================================================================== */
.topbar-wrapper {
    display: none;
    height: var(--topbar-height);
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1030;
}

@media (max-width: 991.98px) {
    .fix-mobile-scroll {
        height: auto !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        display: block !important;
        padding-bottom: 40px;
    }

    /* FIX SIDEBAR SHADOW & INIT STATE */
    .sidebar-wrapper {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        transform: translateX(-100%) !important;
        box-shadow: none !important;
    }

    .sidebar-wrapper.show {
        transform: translateX(0) !important;
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5) !important;
    }

    .topbar-wrapper {
        display: flex;
    }

    .content-container {
        padding-top: calc(var(--topbar-height) + 20px);
    }

    .sidebar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1035;
        display: none;
    }

    .sidebar-backdrop.show {
        display: block;
    }
}