:root[data-theme="light"] {
    --bg-main: #f8f9fa;
    --bg-surface: #ffffff;
    --bg-sidebar: #ffffff;
    --border: #e9ecef;
    --text-main: #212529;
    --text-muted: #6c757d;
    --accent: #4361ee;
    --accent-hover: #3a56d4;
    --danger: #ef476f;
    --success: #06d6a0;
    --toolbar-bg: #ffffff;
    --toolbar-hover: #f1f3f5;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

:root[data-theme="dark"] {
    --bg-main: #0f1115;
    --bg-surface: #181a20;
    --bg-sidebar: #181a20;
    --border: #2c2e33;
    --text-main: #e9ecef;
    --text-muted: #868e96;
    --accent: #4361ee;
    --accent-hover: #5a75f5;
    --danger: #ef476f;
    --success: #06d6a0;
    --toolbar-bg: #181a20;
    --toolbar-hover: #252830;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow: hidden; /* App feel */
    transition: background-color 0.3s, color 0.3s;
}

/* ── Layout ── */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.editor-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
}

/* ── Header ── */
.editor-header {
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-weight: 600;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 16px;
    color: var(--text-main);
}
.logo i { color: var(--accent); }

.action-btn, .theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}
.action-btn:hover, .theme-toggle:hover {
    background: var(--toolbar-hover);
    border-color: var(--text-muted);
}
.action-btn i { font-size: 14px; }
.theme-toggle { padding: 6px 10px; font-size: 15px; }

.quick-stats {
    font-size: 13px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* ── Toolbar ── */
.toolbar {
    height: 48px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    background: var(--toolbar-bg);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    flex-shrink: 0;
    scrollbar-width: none;
}
.toolbar::-webkit-scrollbar { display: none; }

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 4px;
}
.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 12px;
}

.toolbar-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    font-size: 14px;
}
.toolbar-btn:hover {
    background: var(--toolbar-hover);
    color: var(--text-main);
}
.toolbar-btn.active {
    background: var(--accent);
    color: white;
}

.toolbar-select {
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 13px;
    cursor: pointer;
}
.toolbar-select:focus { outline: none; border-color: var(--accent); }

/* ── Tab Bar ── */
.tab-bar {
    display: flex;
    align-items: center;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    height: 40px;
    padding: 0 16px;
    overflow-x: auto;
    flex-shrink: 0;
    scrollbar-width: none;
}
.tab {
    padding: 6px 12px;
    margin-right: 4px;
    background: var(--toolbar-hover);
    border: 1px solid var(--border);
    border-bottom: none;
    border-radius: 6px 6px 0 0;
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 200px;
}
.tab.active {
    background: var(--bg-main);
    color: var(--text-main);
    border-bottom: 2px solid var(--accent);
}
.tab-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tab-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 12px;
}
.tab-close:hover { color: var(--danger); }
.tab-add {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.tab-add:hover { background: var(--toolbar-hover); color: var(--text-main); }
.tab-rename-input {
    background: var(--bg-surface);
    border: 1px solid var(--accent);
    color: var(--text-main);
    padding: 2px 4px;
    font-family: inherit;
    font-size: 13px;
    border-radius: 4px;
    outline: none;
}

/* ── Editor ── */
.editor-container {
    flex: 1;
    overflow-y: auto;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
}
#editor {
    width: 100%;
    max-width: 800px;
    min-height: 100%;
    outline: none;
    font-size: 16px;
    color: var(--text-main);
    padding-bottom: 100px; /* scroll space */
}
#editor[placeholder]:empty:before {
    content: attr(placeholder);
    color: var(--text-muted);
    pointer-events: none;
    display: block;
}
#editor p { margin-bottom: 1em; }
#editor ul, #editor ol { padding-left: 20px; margin-bottom: 1em; }

/* ── Sidebar ── */
.tools-sidebar {
    width: 320px;
    background: var(--bg-sidebar);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease, transform 0.3s ease;
    flex-shrink: 0;
}
.tools-sidebar.collapsed {
    width: 0;
    border-left: none;
    overflow: hidden;
}

.sidebar-header {
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.sidebar-header h3 {
    font-size: 14px;
    font-weight: 600;
}
.close-sidebar-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
}
.close-sidebar-btn:hover { color: var(--text-main); }

.sidebar-nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.sidebar-tab {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 12px 0;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}
.sidebar-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}
.panel {
    display: none;
}
.panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* Stats UI */
.stat-card {
    background: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 16px;
}
.stat-card h4 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 8px;
}
.stat-row:last-child { margin-bottom: 0; }
.highlight { color: var(--accent); font-weight: 600; }

.stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.stat-item {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-val { font-size: 18px; font-weight: 600; font-family: var(--font-mono); }
.stat-lbl { font-size: 11px; color: var(--text-muted); text-transform: uppercase; }

/* Tools UI */
.tool-group {
    margin-bottom: 24px;
}
.tool-group h4 {
    font-size: 13px;
    margin-bottom: 12px;
}
.tool-input {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 8px;
    outline: none;
    font-family: inherit;
}
.tool-input:focus { border-color: var(--accent); }
.tool-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}
.checkbox-label {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}
.tool-btn {
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}
.tool-btn:hover { background: var(--toolbar-hover); border-color: var(--text-muted); }
.tool-btn.primary {
    background: var(--accent);
    color: white;
    border: none;
}
.tool-btn.primary:hover { background: var(--accent-hover); }

.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

/* ── Modals ── */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.hidden { display: none; }
.modal-content {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.modal-close-btn {
    position: absolute;
    top: 16px; right: 16px;
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
}
.modal-close-btn:hover { color: var(--text-main); }

/* Dictionary styles inside modal */
#modal-word { font-size: 24px; margin-bottom: 16px; text-transform: capitalize; }
#phonetic-display { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; color: var(--text-muted); font-family: var(--font-mono); }
#phonetic-display button { background: var(--toolbar-hover); border: none; border-radius: 50%; width: 28px; height: 28px; cursor: pointer; color: var(--accent); }
#modal-body h3 { font-size: 14px; margin: 16px 0 8px; color: var(--accent); }
#modal-body ol { margin-left: 20px; font-size: 14px; }
#modal-body li { margin-bottom: 6px; }
#synonyms-list { display: flex; flex-wrap: wrap; gap: 6px; }
#synonyms-list span { background: var(--bg-main); padding: 2px 8px; border-radius: 4px; font-size: 12px; border: 1px solid var(--border); }
#translation-section { display: flex; gap: 12px; align-items: center; }
#language-select { padding: 6px; border-radius: 4px; background: var(--bg-main); color: var(--text-main); border: 1px solid var(--border); outline: none; }

/* Voice List styles inside modal */
.modal-header { margin-bottom: 16px; }
.current-voice-indicator { font-size: 13px; margin-bottom: 16px; padding: 8px; background: var(--bg-main); border-radius: 6px; border: 1px solid var(--border); }
.voice-list { display: flex; flex-direction: column; gap: 8px; }
.voice-item { padding: 10px 12px; background: var(--bg-main); border: 1px solid var(--border); border-radius: 6px; cursor: pointer; font-size: 14px; transition: all 0.2s; }
.voice-item:hover { border-color: var(--accent); }
.voice-item.active { border-color: var(--accent); background: rgba(67, 97, 238, 0.1); }
.voice-item-lang { color: var(--text-muted); font-size: 12px; float: right; }

/* Loader */
.loader { border: 3px solid var(--border); border-top: 3px solid var(--accent); border-radius: 50%; width: 24px; height: 24px; animation: spin 1s linear infinite; margin: 20px auto; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ── Alerts & Toasts ── */
.alert {
    position: fixed;
    bottom: 20px; left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    transition: transform 0.3s ease;
    z-index: 100;
}
.alert.show { transform: translateX(-50%) translateY(0); }
.alert-success { background: var(--success); }
.alert-error { background: var(--danger); }

.toast {
    position: fixed;
    bottom: 20px; right: 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(100px);
    transition: transform 0.3s ease;
    z-index: 100;
}
.toast.show { transform: translateY(0); }

/* Responsive */
@media (max-width: 768px) {
    .tools-sidebar {
        position: absolute;
        right: 0; top: 0;
        height: 100%;
        z-index: 50;
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    }

    .editor-header {
        padding: 0 12px;
    }

    .header-left, .header-right {
        gap: 8px;
    }

    .logo span {
        display: none; /* Hide 'Nexys Write' text to save space */
    }
    
    .logo {
        margin-right: 8px;
    }

    .quick-stats {
        display: none; /* Hide stats in header, available in sidebar */
    }

    /* Hide text inside header action buttons, just keep the icons */
    .header-left .action-btn {
        font-size: 0; 
        padding: 8px 10px;
    }
    
    .header-left .action-btn i {
        font-size: 14px;
        margin: 0;
    }

    .toolbar {
        padding: 0 12px;
    }

    .tab-bar {
        padding: 0 12px;
    }

    .tab {
        max-width: 140px;
    }

    .editor-container {
        padding: 20px 16px;
    }
}

@media (max-width: 480px) {
    .tab {
        max-width: 100px;
    }
    
    .toolbar-select {
        max-width: 110px;
    }
    
    /* Hide the read aloud text, just keep the icon */
    #btn-read-aloud {
        font-size: 0;
    }
    #btn-read-aloud i {
        font-size: 14px;
    }
    #btn-read-aloud span {
        display: none;
    }
}