/* ============================================
   CSS RESET & BASE STYLES
   ============================================ */

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

/* Hidden element utility */
.hidden {
    display: none !important;
}

:root {
    /* Dark Mode Colors (Default) */
    --bg-primary: #1a1a1a;
    --bg-secondary: #242424;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e4e4e4;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --border-color: #3a3a3a;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --code-bg: #1e1e1e;
    --sidebar-bg: #1f1f1f;
    --toolbar-bg: rgba(26, 26, 26, 0.95);
    --overlay-bg: rgba(0, 0, 0, 0.7);
    --success-color: #10b981;
    --error-color: #ef4444;

    /* Spacing & Typography */
    --sidebar-width: 280px;
    --toolbar-height: 60px;
    --border-radius: 8px;
    --transition-speed: 250ms;
}

/* Light Mode Theme */
body.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --bg-tertiary: #efefef;
    --text-primary: #1a1a1a;
    --text-secondary: #505050;
    --text-tertiary: #808080;
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --code-bg: #f5f5f5;
    --sidebar-bg: #fafafa;
    --toolbar-bg: rgba(255, 255, 255, 0.95);
    --overlay-bg: rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* ============================================
   SIDEBAR NAVIGATION
   ============================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 100;
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.sidebar-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.add-doc-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    margin-left: auto;
}

.add-doc-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
}

.nav-list {
    padding: 12px 8px;
}

.nav-item {
    display: block;
    padding: 12px 16px;
    margin-bottom: 4px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-speed);
    cursor: pointer;
}

.nav-item:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item.active {
    background-color: var(--accent-primary);
    color: #ffffff;
}

.nav-item.active:hover {
    background-color: var(--accent-hover);
    transform: translateX(0);
}

/* Custom Scrollbar for Sidebar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ============================================
   MAIN CONTENT AREA
   ============================================ */

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--transition-speed);
}

/* ============================================
   TOOLBAR
   ============================================ */

.toolbar {
    position: sticky;
    top: 0;
    height: var(--toolbar-height);
    background-color: var(--toolbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    z-index: 50;
    transition: background-color var(--transition-speed);
}

.toolbar-left {
    flex: 1;
}

.current-doc-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.toolbar-right {
    display: flex;
    gap: 8px;
    align-items: center;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.toolbar-btn:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.toolbar-btn:active {
    transform: translateY(0);
}

.toolbar-btn svg {
    flex-shrink: 0;
}

/* ============================================
   CONTENT DISPLAY AREA
   ============================================ */

.content-area {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 32px;
    animation: fadeIn 300ms ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-message {
    text-align: center;
    padding: 80px 20px;
}

.welcome-message h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.welcome-message p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* ============================================
   MARKDOWN CONTENT STYLES
   ============================================ */

.content-area h1 {
    font-size: 32px;
    font-weight: 700;
    margin-top: 48px;
    margin-bottom: 16px;
    color: var(--text-primary);
    line-height: 1.2;
}

.content-area h2 {
    font-size: 26px;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 14px;
    color: var(--text-primary);
    line-height: 1.3;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.content-area h3 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.content-area h4,
.content-area h5,
.content-area h6 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.content-area p {
    margin-bottom: 16px;
    color: var(--text-primary);
    line-height: 1.7;
}

.content-area a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.content-area a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.content-area ul,
.content-area ol {
    margin-bottom: 16px;
    padding-left: 28px;
}

.content-area li {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.content-area blockquote {
    margin: 24px 0;
    padding: 16px 20px;
    border-left: 4px solid var(--accent-primary);
    background-color: var(--bg-secondary);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.content-area blockquote p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-style: italic;
}

.content-area code {
    background-color: var(--code-bg);
    color: var(--accent-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
}

.content-area pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 24px;
}

.content-area pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: 14px;
    line-height: 1.5;
}

.content-area table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.content-area th,
.content-area td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.content-area th {
    background-color: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.content-area tr:nth-child(even) {
    background-color: var(--bg-secondary);
}

.content-area tr:hover {
    background-color: var(--bg-tertiary);
}

.content-area img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 24px 0;
}

.content-area hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 32px 0;
}

/* ============================================
   EDIT MODE TEXTAREA
   ============================================ */

.edit-area {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 32px;
}

.edit-textarea {
    width: 100%;
    min-height: calc(100vh - var(--toolbar-height) - 96px);
    padding: 20px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.edit-textarea:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* ============================================
   SEARCH OVERLAY
   ============================================ */

.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--overlay-bg);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 100px;
    animation: fadeIn 200ms ease-in;
}

.search-modal {
    width: 90%;
    max-width: 600px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 20px 60px var(--shadow-color);
    overflow: hidden;
    animation: slideDown 200ms ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.search-input-container {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.search-input-container svg {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.search-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
    padding: 8px;
}

.search-result-item {
    padding: 12px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    margin-bottom: 4px;
}

.search-result-item:hover {
    background-color: var(--bg-tertiary);
}

.search-result-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.search-result-snippet {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.search-result-snippet mark {
    background-color: var(--accent-primary);
    color: #ffffff;
    padding: 2px 4px;
    border-radius: 2px;
}

.search-no-results {
    padding: 32px 20px;
    text-align: center;
    color: var(--text-secondary);
}

/* ============================================
   MOBILE MENU TOGGLE
   ============================================ */

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 150;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.mobile-menu-toggle:hover {
    background-color: var(--bg-tertiary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }

    .toolbar {
        padding: 0 20px;
    }

    .content-area,
    .edit-area {
        padding: 32px 24px;
    }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .toolbar {
        padding: 0 16px 0 60px;
    }

    .current-doc-title {
        font-size: 16px;
    }

    .toolbar-btn span {
        display: none;
    }

    .toolbar-btn {
        padding: 8px 10px;
    }

    .content-area,
    .edit-area {
        padding: 24px 16px;
    }

    .content-area h1 {
        font-size: 28px;
    }

    .content-area h2 {
        font-size: 22px;
    }

    .welcome-message h1 {
        font-size: 28px;
    }

    .welcome-message p {
        font-size: 16px;
    }

    .search-overlay {
        padding-top: 60px;
    }
}

/* Very Small Mobile (< 480px) */
@media (max-width: 480px) {
    .toolbar-right {
        gap: 4px;
    }

    .toolbar-btn {
        padding: 6px 8px;
    }

    .search-modal {
        width: 95%;
    }
}

/* ============================================
   ADD DOCUMENT MODAL
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--overlay-bg);
    backdrop-filter: blur(4px);
    z-index: 250;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 200ms ease-in;
}

.modal-dialog {
    width: 90%;
    max-width: 600px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: slideDown 200ms ease-out;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.modal-close-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group:last-child {
    margin-bottom: 0;
}

/* ============================================
   LOGIN OVERLAY & FORM
   ============================================ */

.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 20px 60px var(--shadow-color);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-primary);
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.login-btn:hover {
    background-color: var(--accent-hover);
}

.app-container {
    width: 100%;
    min-height: 100vh;
}



.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-primary);
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

.form-textarea {
    width: 100%;
    min-height: 200px;
    padding: 12px 14px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-primary);
}

.form-textarea::placeholder {
    color: var(--text-tertiary);
    font-family: inherit;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.modal-btn {
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: none;
}

.modal-btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal-btn-secondary:hover {
    background-color: var(--bg-secondary);
}

.modal-btn-primary {
    background-color: var(--accent-primary);
    color: #ffffff;
}

.modal-btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.modal-btn-primary:active {
    transform: translateY(0);
}