/* Student Writing Page Styles */
:root {
    --bg: var(--bg-main, #fdfbf7);
    --card: var(--card-bg, #ffffff);
    --border: var(--border, #e7e5e4);
    --text: var(--text-main, #1c1917);
    --muted: var(--text-sub, #78716c);
    --primary: var(--primary, #818cf8);
    --primary-soft: var(--accent-soft, rgba(129, 140, 248, 0.15));
    --accent: var(--accent, #f59e0b);
    --radius: 16px;
    --safe-bottom: env(safe-area-inset-bottom, 20px);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0 0 24px 0;
    font-family: 'Pretendard', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg, var(--card));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

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

#myName {
    font-weight: 700;
    color: var(--primary);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 5px 14px;
    border-radius: 99px;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

#myName::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent);
}

.title {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text);
    cursor: pointer;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
}

.topic-badge {
    display: inline-block;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 800;
    padding: 5px 10px;
    border-radius: 8px;
    margin-bottom: 12px;
    letter-spacing: 0.2px;
}

.topic-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    line-height: 1.4;
    color: var(--text);
    word-break: keep-all;
}

.topic-desc {
    font-size: 1rem;
    color: var(--muted);
    line-height: 1.6;
}

/* Thinking Helper */
.helper-box {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
}

.helper-header {
    padding: 12px 16px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.helper-content {
    padding: 16px;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text);
    display: none;
    white-space: pre-wrap;
}

.helper-content.open {
    display: block;
}

/* Editor */
textarea {
    width: 100%;
    min-height: 250px;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    background: var(--bg);
    transition: all 0.2s;
}

textarea:focus {
    border-color: var(--primary);
    background: #fff;
}

.btn {
    width: 100%;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.btn:active {
    transform: scale(0.97);
}

#btnSpellCheck {
    background: var(--bg);
    border: 1px solid var(--border);
}

#btnSpellCheck:hover {
    background: var(--card);
    border-color: var(--accent);
    color: var(--accent);
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover, #6366f1));
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px rgba(129, 140, 248, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(129, 140, 248, 0.6);
}

.btn.disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* Feedback Box */
.feedback-box {
    background: var(--primary-soft);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-top: 16px;
}

.fb-title {
    color: #b45309;
    font-weight: 800;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.fb-text {
    font-size: 0.92rem;
    color: #78350f;
    line-height: 1.6;
    white-space: pre-wrap;
}

/* Spellcheck UI */
.spell-panel {
    background: var(--card);
    border: 1px solid var(--accent);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
}

.spell-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.spell-result-list {
    font-size: 0.9rem;
    max-height: 200px;
    overflow-y: auto;
}

.spell-item {
    margin-bottom: 8px;
    padding: 10px;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #fef3c7;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.spell-wrong {
    color: #ef4444;
    text-decoration: line-through;
    font-weight: 700;
    margin-right: 6px;
}

.spell-right {
    color: #059669;
    font-weight: 700;
    background: #d1fae5;
    padding: 2px 4px;
    border-radius: 4px;
}

.spell-desc {
    font-size: 0.8rem;
    color: #6b7280;
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px dashed #eee;
}

/* Toast UI Editor Fixes */
.toastui-editor-defaultUI {
    border-radius: 12px !important;
    border: 1px solid var(--border) !important;
    overflow: hidden !important;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.toastui-editor-toolbar {
    background-color: var(--card) !important;
    border-bottom: 1px solid var(--border) !important;
    padding: 4px !important;
}

/* Toolbar button styling to avoid white boxes */
.toastui-editor-toolbar button {
    background-color: transparent !important;
    border: 1px solid transparent !important;
    border-radius: 4px !important;
    margin: 2px !important;
}

.toastui-editor-toolbar button:hover {
    background-color: var(--bg) !important;
    border-color: var(--border) !important;
}

/* --- Editor Dark/Eye-Comfort Overrides --- */
[data-theme="default-dark"] .toastui-editor-defaultUI,
[data-theme="ocean-blue"] .toastui-editor-defaultUI,
[data-theme="nordic-quiet"] .toastui-editor-defaultUI {
    background-color: var(--card) !important;
    border-color: var(--border) !important;
}

[data-theme="default-dark"] .toastui-editor-main,
[data-theme="ocean-blue"] .toastui-editor-main,
[data-theme="nordic-quiet"] .toastui-editor-main,
[data-theme="default-dark"] .toastui-editor-ww-container,
[data-theme="ocean-blue"] .toastui-editor-ww-container,
[data-theme="nordic-quiet"] .toastui-editor-ww-container {
    background-color: #1e293b !important;
    /* Eye-comfort deep shade */
}

/* Ensure text and placeholder visibility in dark mode */
[data-theme="default-dark"] .toastui-editor-contents,
[data-theme="ocean-blue"] .toastui-editor-contents,
[data-theme="nordic-quiet"] .toastui-editor-contents {
    color: #e2e8f0 !important;
}

[data-theme="default-dark"] .toastui-editor-contents p,
[data-theme="ocean-blue"] .toastui-editor-contents p {
    color: #e2e8f0 !important;
}

/* Dark mode toolbar icon brightness */
[data-theme="default-dark"] .toastui-editor-toolbar-icons,
[data-theme="ocean-blue"] .toastui-editor-toolbar-icons,
[data-theme="nordic-quiet"] .toastui-editor-toolbar-icons {
    filter: invert(0.8) brightness(1.2);
}

[data-theme="default-dark"] .toastui-editor-mode-switch,
[data-theme="ocean-blue"] .toastui-editor-mode-switch,
[data-theme="nordic-quiet"] .toastui-editor-mode-switch {
    background-color: var(--card) !important;
    border-top: 1px solid var(--border) !important;
}

[data-theme="default-dark"] .toastui-editor-mode-switch .tab-item,
[data-theme="ocean-blue"] .toastui-editor-mode-switch .tab-item,
[data-theme="nordic-quiet"] .toastui-editor-mode-switch .tab-item {
    background-color: transparent !important;
    color: var(--muted) !important;
    border: none !important;
    border-radius: 8px !important;
    margin: 4px !important;
}

[data-theme="default-dark"] .toastui-editor-mode-switch .tab-item.active,
[data-theme="ocean-blue"] .toastui-editor-mode-switch .tab-item.active,
[data-theme="nordic-quiet"] .toastui-editor-mode-switch .tab-item.active {
    background-color: var(--primary) !important;
    color: #ffffff !important;
}

/* Tab Bar */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg, var(--card));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    padding: 12px 0 calc(12px + var(--safe-bottom)) 0;
    z-index: 100;
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.2);
}

.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    color: var(--muted);
    cursor: pointer;
    text-decoration: none;
}

.tab-item.active {
    color: var(--primary);
    font-weight: 700;
}

.tab-icon {
    font-size: 24px;
}

#loadingOverlay {
    position: fixed;
    inset: 0;
    background: var(--card);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    color: var(--primary);
    z-index: 100;
}

.hidden {
    display: none !important;
}

/* History List Styles */
.history-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.history-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

.history-item:hover {
    transform: translateX(5px);
    border-color: var(--primary);
}

.hist-info {
    flex: 1;
    min-width: 0;
}

.hist-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hist-date {
    font-size: 0.75rem;
    color: var(--muted);
}

.hist-badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 800;
    margin-left: 10px;
    white-space: nowrap;
}

.hist-badge.submitted {
    background: var(--primary-soft);
    color: var(--primary);
}

.hist-badge.feedback {
    background: var(--accent-soft);
    color: var(--accent);
}