/* ===== 全域變數 ===== */
:root {
    --color-bg: #faf9f7;
    --color-card: #ffffff;
    --color-text: #3d3d3d;
    --color-text-light: #6b6b6b;
    --color-accent: #7c9082;
    --color-accent-light: #a8bfae;
    --color-border: #e8e6e3;
    --color-input-bg: #f5f4f2;
    --font-serif: 'Noto Serif TC', serif;
    --font-sans: 'Noto Sans TC', sans-serif;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.header h1 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.05em;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

/* ===== Main Layout ===== */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.panel-main {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    min-width: 0;
}

.panel-post {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.panel-post h2 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

/* ===== Tab Navigation ===== */
.tab-nav {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1.5rem;
    padding-bottom: 0;
    overflow-x: auto;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-text-light);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--color-text);
}

.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* ===== Tab Content ===== */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.tab-pane h2 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.section-desc {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 1.25rem;
}

/* ===== 靈感區 ===== */
.idea-inputs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.idea-row {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.idea-row label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
}

.idea-input-group {
    display: flex;
    gap: 0.5rem;
}

.idea-input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background: var(--color-input-bg);
    transition: border-color 0.2s;
}

.idea-input-group input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.btn-open {
    padding: 0.75rem 1rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

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

/* ===== 題目區 ===== */
.topics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.btn-save-small {
    padding: 0.4rem 1rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.8rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-save-small:hover {
    background: var(--color-accent-light);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.75rem;
    max-height: 500px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.topic-card {
    background: var(--color-input-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    transition: all 0.2s;
}

.topic-card:hover {
    border-color: var(--color-accent-light);
}

.topic-card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.topic-card-day {
    background: var(--color-accent);
    color: white;
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    min-width: 2.5rem;
    text-align: center;
}

.topic-card-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    background: transparent;
    resize: none;
    line-height: 1.5;
    transition: all 0.2s;
}

.topic-card-input:focus {
    outline: none;
    background: var(--color-card);
    border-color: var(--color-accent);
}

.topic-card-input::placeholder {
    color: var(--color-text-light);
}

/* ===== 自介區 ===== */
.intro-inputs {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.intro-row {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.intro-row label {
    font-size: 0.85rem;
    font-weight: 500;
}

.intro-row textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    resize: vertical;
    background: var(--color-input-bg);
}

.intro-row textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* ===== 進度表 ===== */
.progress-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.progress-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    min-width: 800px;
}

.progress-table th,
.progress-table td {
    padding: 0.5rem 0.4rem;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.progress-table th {
    font-weight: 500;
    color: var(--color-text-light);
    font-size: 0.75rem;
    background: var(--color-card);
}

.progress-table th.name-col,
.progress-table td.name-cell {
    position: sticky;
    left: 0;
    background: var(--color-card);
    z-index: 1;
    text-align: left;
    padding-left: 0.5rem;
    min-width: 60px;
}

.progress-table td.name-cell {
    font-weight: 500;
}

.status-empty {
    color: #ccc;
}

.status-submitted {
    color: var(--color-accent);
}

.status-feedback {
    color: var(--color-accent);
}

/* ===== 學員選擇 ===== */
.member-select {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.member-select label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    white-space: nowrap;
}

.member-buttons {
    display: flex;
    gap: 0.5rem;
}

.member-btn {
    padding: 0.6rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-input-bg);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.member-btn:hover {
    border-color: var(--color-accent);
}

.member-btn.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* ===== 文章輸入區 ===== */
.post-section {
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.post-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.current-member {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-accent);
}

.day-select select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background: var(--color-input-bg);
}

.post-input {
    margin-bottom: 1rem;
}

.post-input textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    resize: vertical;
    background: var(--color-input-bg);
}

.post-input textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.post-actions {
    display: flex;
    gap: 0.75rem;
}

/* ===== 查看回饋區 ===== */
.feedback-view {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.feedback-view h4 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.feedback-item {
    margin-bottom: 1rem;
}

.feedback-item label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--color-text);
}

.feedback-box {
    padding: 1rem;
    background: var(--color-input-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    line-height: 1.7;
    white-space: pre-wrap;
    min-height: 80px;
}

.feedback-box.empty {
    color: var(--color-text-light);
    font-style: italic;
}

/* ===== Buttons ===== */
.btn-submit {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn-save {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn-edit {
    padding: 0.4rem 0.75rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-edit:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ===== 改作業區 ===== */
.panel-review {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.review-header h2 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 500;
    margin: 0;
}

.review-selects {
    display: flex;
    gap: 0.5rem;
}

.review-selects select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background: var(--color-input-bg);
    cursor: pointer;
}

.review-selects select:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* 批改卡片 */
.review-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.review-block {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.review-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
}

.review-readonly {
    padding: 1rem;
    background: var(--color-input-bg);
    border-radius: var(--radius);
    font-size: 0.9rem;
    min-height: 120px;
    white-space: pre-wrap;
    line-height: 1.7;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.review-block textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    resize: vertical;
    background: var(--color-input-bg);
    line-height: 1.6;
}

.review-block textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-card);
}

.review-placeholder {
    padding: 3rem 1rem;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ===== 輸入框包裝（含放大按鈕） ===== */
.input-wrap {
    position: relative;
    display: flex;
    flex-direction: column;
}

.input-wrap input,
.input-wrap textarea {
    width: 100%;
    padding-right: 2.5rem;
}

.btn-expand {
    position: absolute;
    right: 0.5rem;
    top: 0.5rem;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
    color: var(--color-text-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    opacity: 0.6;
}

.btn-expand:hover {
    opacity: 1;
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ===== 放大編輯 Modal ===== */
.expand-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.expand-modal-content {
    background: var(--color-card);
    border-radius: var(--radius);
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

.expand-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.expand-modal-header span {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
}

.expand-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-light);
    cursor: pointer;
    line-height: 1;
    padding: 0.25rem;
}

.expand-modal-close:hover {
    color: var(--color-text);
}

.expand-modal-textarea {
    flex: 1;
    margin: 1rem 1.25rem;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-sans);
    resize: none;
    min-height: 300px;
    line-height: 1.7;
    background: var(--color-input-bg);
}

.expand-modal-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-card);
}

.expand-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--color-border);
}

.btn-cancel {
    padding: 0.6rem 1.25rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-cancel:hover {
    border-color: var(--color-text-light);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.85rem;
}

/* ===== RWD: Tablet ===== */
@media (max-width: 900px) {
    .review-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===== RWD: Mobile ===== */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.4rem;
    }

    .panel-main,
    .panel-post,
    .panel-review {
        padding: 1rem;
    }

    .tab-nav {
        gap: 0.25rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        padding: 0.6rem 0.75rem;
        font-size: 0.85rem;
    }

    .member-select {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .post-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .post-actions {
        flex-direction: column;
    }

    .btn-submit {
        width: 100%;
    }

    .review-select {
        flex-direction: column;
        align-items: flex-start;
    }

    .panel-review {
        padding: 1rem;
    }

    /* 進度表手機優化 */
    .progress-table {
        font-size: 0.75rem;
        min-width: 600px;
    }

    .progress-table th,
    .progress-table td {
        padding: 0.4rem 0.25rem;
    }

    .progress-table th {
        font-size: 0.65rem;
    }

    .progress-table th.name-col,
    .progress-table td.name-cell {
        min-width: 50px;
        padding-left: 0.25rem;
    }
}