:root {
    /* Mode Light */
    --primary-color: #018DA5;
    --secondary-color: #80DAEB;
    --accent-color: #67DDAB;
    --teal-color: #0B9B8A;
    --gray-color: #909090;
    --dark-bg: #0a192f;
    --body-bg: #f5f5f5;
    --card-bg: #ffffff;
    --card-header: var(--teal-color);
    --card-header-text: #ffffff;
    --text-color: #333333;
    --border-color: rgba(0, 0, 0, 0.125);
}

[data-bs-theme="dark"] {
    --primary-color: #018DA5;
    --secondary-color: #80DAEB;
    --accent-color: #67DDAB;
    --teal-color: #0B9B8A;
    --gray-color: #909090;
    --dark-bg: #0a192f;
    --body-bg: #121212;
    --card-bg: #1e1e1e;
    --card-header: #272727;
    --card-header-text: #f0f0f0;
    --text-color: #f0f0f0;
    --border-color: rgba(255, 255, 255, 0.125);
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--body-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Wrapper structure */
.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header & Navbar styling */
header {
    background-color: var(--dark-bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar {
    padding: 0.5rem 1rem;
    height: auto;
}

.navbar-brand {
    color: var(--card-header-text) !important;
    font-weight: bold;
}

.navbar-toggler {
    border-color: var(--gray-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Main content area */
.content {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

/* Theme Toggle Button */
#themeToggle {
    color: var(--text-color);
    border-color: var(--gray-color);
    padding: 0.25rem 0.5rem;
}

.theme-icon-light {
    display: none;
}

.theme-icon-dark {
    display: inline-block;
}

[data-bs-theme="dark"] .theme-icon-light {
    display: inline-block;
}

[data-bs-theme="dark"] .theme-icon-dark {
    display: none;
}

/* Button styles */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #016d80;
    border-color: #016d80;
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--dark-bg);
}

.btn-secondary:hover {
    background-color: #6bc0d0;
    border-color: #6bc0d0;
    color: var(--dark-bg);
}

.btn-success {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--dark-bg);
}

.btn-success:hover {
    background-color: #55c498;
    border-color: #55c498;
}

.btn-outline-secondary {
    color: var(--text-color);
    border-color: var(--gray-color);
}

.btn-outline-secondary:hover {
    background-color: var(--gray-color);
    color: var(--card-bg);
}

/* Card styling */
.card {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    transition: background-color 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.card-header {
    background-color: var(--card-header);
    color: var(--card-header-text);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    height: auto;
}

.card-body {
    flex: 1;
    padding: 0;
    background-color: var(--card-bg);
    overflow: hidden;
}

/* Editor and preview cards */
.editor-card, .preview-card {
    height: 70vh;
}

/* Editor textarea */
#markdownEditor {
    width: 100%;
    height: 100%;
    resize: none;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.5;
    padding: 1rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    border: none;
    border-radius: 0;
}

/* Preview area */
#markdownPreview {
    height: 100%;
    padding: 1rem;
    overflow-y: auto;
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Markdown preview styling */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--primary-color);
}

.markdown-body h1 {
    font-size: 1.8em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h2 {
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body code {
    background-color: rgba(27, 31, 35, 0.05);
    border-radius: 3px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 85%;
    padding: 0.2em 0.4em;
}

[data-bs-theme="dark"] .markdown-body code {
    background-color: rgba(240, 240, 240, 0.05);
}

.markdown-body pre {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 85%;
    line-height: 1.45;
    overflow: auto;
    padding: 16px;
}

.markdown-body blockquote {
    border-left: 4px solid var(--secondary-color);
    color: var(--gray-color);
    padding: 0 1em;
    margin-left: 0;
}

.markdown-body table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 16px;
}

.markdown-body table th,
.markdown-body table td {
    border: 1px solid var(--border-color);
    padding: 6px 13px;
}

.markdown-body table th {
    background-color: rgba(0, 0, 0, 0.05);
}

[data-bs-theme="dark"] .markdown-body table th {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Expanded state for panels */
.expanded {
    position: fixed;
    top: 60px;
    left: 15px;
    right: 15px;
    bottom: 40px;
    z-index: 1000;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: var(--gray-color);
    padding: 0;
    margin-top: auto;
}

/* Responsive adjustments */
@media (max-width: 767.98px) {
    .editor-card, .preview-card {
        height: 40vh;
    }
}