:root {
    --bs-font-sans-serif: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --bs-font-serif: 'Noto Serif SC', serif;
    --bs-font-monospace: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    
    /* Custom Palette */
    --sui-red: #c92f2f;      /* Classic Chinese Red */
    --sui-red-soft: #e6b3b3; 
    --sui-ink: #2c2c2c;      /* Deep Ink Black */
    --sui-paper: #f9f9f7;    /* Rice Paper White */
    --sui-gold: #d4af37;     /* Subtle Gold Accent */
}

body {
    font-family: var(--bs-font-sans-serif);
    background-color: var(--sui-paper);
    color: var(--sui-ink);
}

.logo-symbol {
    font-family: var(--bs-font-serif);
    font-size: 1.8rem;
    color: white;
    background-color: var(--sui-red);
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border-radius: 4px;
    /* Subtle seal border effect */
    box-shadow: 0 0 0 2px var(--sui-paper), 0 0 0 4px var(--sui-red);
}

/* Sidebar overrides */
aside.bg-light {
    background-color: #fcfcfc !important;
}

/* Button overrides - Primary Action */
.btn-dark {
    background-color: var(--sui-ink);
    border-color: var(--sui-ink);
}

.btn-dark:hover {
    background-color: #000;
    border-color: #000;
}

/* Progress Bar */
.progress-bar {
    background-color: var(--sui-red) !important;
}

/* Background Pattern - subtle "Asanoha" or lattice */
.bg-pattern {
    background-color: #ffffff;
    opacity: 0.5;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cpath d='M0 20 L20 0 L40 20 L20 40 Z' fill='none' stroke='%23888' stroke-width='0.5'/%3E%3Cpath d='M-20 20 L0 0 L20 20 L0 40 Z' fill='none' stroke='%23888' stroke-width='0.5'/%3E%3Cpath d='M20 20 L40 0 L60 20 L40 40 Z' fill='none' stroke='%23888' stroke-width='0.5'/%3E%3C/svg%3E");
    background-size: 40px 40px;
}

.backdrop-blur {
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

/* Header styling */
header {
    background: white;
    border-bottom: 1px solid rgba(0,0,0,0.05) !important;
}

.badge.bg-danger-subtle {
    background-color: #fff5f5 !important; 
    color: var(--sui-red) !important;
    border-color: #ffe0e0 !important;
}

/* Code Preview */
.code-preview-container {
    background-color: #fafafa;
    border-color: #e0e0e0 !important;
}

code {
    font-family: var(--bs-font-monospace) !important;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Form inputs focus state - Red accent */
.form-control:focus, .form-check-input:focus {
    border-color: var(--sui-red-soft);
    box-shadow: 0 0 0 0.25rem rgba(201, 47, 47, 0.15);
}

.form-check-input:checked {
    background-color: var(--sui-red);
    border-color: var(--sui-red);
}

/* ===========================
   Theme Toggle
   =========================== */
.theme-toggle .btn {
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    transition: all 0.2s ease;
}

/* ===========================
   Info Panel
   =========================== */
.info-panel {
    background-color: #fefefe;
}

.info-card {
    background-color: #f8f5f0;
    border: 1px solid #e8e4de;
    font-size: 0.9rem;
    line-height: 1.5;
}

.info-card a {
    color: var(--sui-red);
    text-decoration: none;
}

.info-card a:hover {
    text-decoration: underline;
}

/* ===========================
   Dark Mode Overrides
   =========================== */
[data-bs-theme="dark"] {
    --sui-paper: #1a1a1e;
    --sui-ink: #e0e0e0;
    --sui-red: #e04545;
    --sui-red-soft: #5c2222;
}

[data-bs-theme="dark"] body {
    background-color: var(--sui-paper);
    color: var(--sui-ink);
}

[data-bs-theme="dark"] header {
    background: #222226 !important;
    border-bottom-color: rgba(255,255,255,0.08) !important;
}

[data-bs-theme="dark"] .h4.fw-bold.text-dark {
    color: var(--sui-ink) !important;
}

[data-bs-theme="dark"] .logo-symbol {
    color: #222226;
    box-shadow: 0 0 0 2px #222226, 0 0 0 4px var(--sui-red);
}

[data-bs-theme="dark"] aside.bg-light {
    background-color: #1e1e22 !important;
    border-color: rgba(255,255,255,0.08) !important;
}

[data-bs-theme="dark"] aside .form-label,
[data-bs-theme="dark"] aside h6 {
    color: #999 !important;
}

[data-bs-theme="dark"] .bg-pattern {
    background-color: #1a1a1e;
    opacity: 0.2;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cpath d='M0 20 L20 0 L40 20 L20 40 Z' fill='none' stroke='%23444' stroke-width='0.5'/%3E%3Cpath d='M-20 20 L0 0 L20 20 L0 40 Z' fill='none' stroke='%23444' stroke-width='0.5'/%3E%3Cpath d='M20 20 L40 0 L60 20 L40 40 Z' fill='none' stroke='%23444' stroke-width='0.5'/%3E%3C/svg%3E");
    background-size: 40px 40px;
    background-position: 0 0;
}

[data-bs-theme="dark"] main.bg-white {
    background-color: #1e1e22 !important;
}

[data-bs-theme="dark"] .backdrop-blur {
    background-color: rgba(30, 30, 34, 0.75) !important;
}

[data-bs-theme="dark"] .code-preview-container {
    background-color: #161618 !important;
    border-color: #333 !important;
}

[data-bs-theme="dark"] code {
    color: #c9d1d9;
}

[data-bs-theme="dark"] footer.bg-white {
    background-color: #1e1e22 !important;
    border-color: rgba(255,255,255,0.08) !important;
}

[data-bs-theme="dark"] .btn-dark {
    background-color: var(--sui-red);
    border-color: var(--sui-red);
}

[data-bs-theme="dark"] .btn-dark:hover {
    background-color: #c03030;
    border-color: #c03030;
}

[data-bs-theme="dark"] .form-control {
    background-color: #2a2a2e;
    border-color: #444;
    color: var(--sui-ink);
}

[data-bs-theme="dark"] .form-check-label {
    color: var(--sui-ink);
}

[data-bs-theme="dark"] .info-panel {
    background-color: #1e1e22;
}

[data-bs-theme="dark"] .info-card {
    background-color: #2a2a2e;
    border-color: #3a3a3e;
}

[data-bs-theme="dark"] .info-card a {
    color: #e88;
}

/* ===========================
   Responsive Layout
   =========================== */
.layout-container {
    height: 100vh; /* Desktop: fixed viewport height */
    overflow: hidden; /* Prevent body scroll on desktop */
}

@media (max-width: 767.98px) {
    /* Mobile: allow natural page scroll */
    .layout-container {
        height: auto !important;
        overflow-y: auto !important;
    }

    /* Disable internal panel scrolling */
    .layout-row, aside, main, .info-panel, .overflow-auto, .overflow-hidden {
        height: auto !important;
        overflow: visible !important;
    }

    /* Remove vertical borders, add horizontal separators */
    .info-panel, aside.bg-light, aside.border-end {
        border-right: none !important;
        border-bottom: 1px solid var(--bs-border-color-translucent) !important;
    }
    
    /* Limit code preview height on mobile so it doesn't take forever to scroll past */
    .code-preview-container pre {
        max-height: 60vh;
    }
}
/* ===========================
   Premium Modal Styling
   =========================== */
.sui-modal {
    background-color: var(--sui-paper);
    color: var(--sui-ink);
    border: none;
}

.sui-modal .modal-header, 
.sui-modal .modal-body, 
.sui-modal .modal-footer {
    background-color: var(--sui-paper);
    border-color: rgba(0,0,0,0.05) !important;
}

/* Modal Internal Elements */
.sui-modal-heading {
    color: var(--sui-ink);
}

.sui-modal-text {
    color: #666;
}

.sui-modal-ref {
    background-color: #f8f9fa;
    color: #666;
}

.sui-dataset-container {
    background-color: rgba(0, 0, 0, 0.02);
}

.sui-dataset-title {
    color: var(--sui-ink);
}

.sui-dataset-desc {
    color: #666;
}

/* Dark Mode Specific Refinements */
[data-bs-theme="dark"] .sui-modal {
    --sui-paper: #222226;
    border: 1px solid rgba(255,255,255,0.08);
}

[data-bs-theme="dark"] .sui-modal .modal-header {
    border-color: rgba(255,255,255,0.08) !important;
}

[data-bs-theme="dark"] .sui-modal .modal-footer {
    background-color: #000 !important;
    border-color: rgba(255,255,255,0.08) !important;
}

[data-bs-theme="dark"] .sui-modal-heading {
    color: var(--sui-ink); /* Already light in dark mode var */
}

[data-bs-theme="dark"] .sui-modal-text {
    color: #b0b0b0;
}

[data-bs-theme="dark"] .sui-modal-ref {
    background-color: #2a2a2e;
    color: #b0b0b0;
    border-color: rgba(255,255,255,0.05) !important;
}

[data-bs-theme="dark"] .sui-dataset-container {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08) !important;
}

[data-bs-theme="dark"] .sui-dataset-title {
    color: var(--sui-ink);
}

[data-bs-theme="dark"] .sui-dataset-desc {
    color: #b0b0b0;
}

/* Modal Title Icon specific fix */
.sui-modal .logo-symbol {
    box-shadow: none !important;
    border: none !important;
}

.sui-modal .btn-close {
    filter: invert(0.2);
}

[data-bs-theme="dark"] .sui-modal .btn-close {
    filter: invert(1);
}

/* ===========================
   Custom Scrollbar
   =========================== */
.custom-scrollbar {
    scrollbar-width: thin;
    scrollbar-color: #ccc transparent;
}
[data-bs-theme="dark"] .custom-scrollbar {
    scrollbar-color: #555 transparent;
}

.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}
[data-bs-theme="dark"] .custom-scrollbar::-webkit-scrollbar-thumb {
    background: #555;
}
[data-bs-theme="dark"] .custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #777;
}