/* ============================================================
   WAT Translator — Thiết kế chuyên nghiệp cho học tiếng Trung
   Theme: Xanh lá tự nhiên | Font: Noto Serif SC + DM Sans
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&family=Noto+Serif+SC:wght@400;600&display=swap');

/* ── CSS Variables ── */
:root {
    --green-900: #1a3a2e;
    --green-800: #1e4d38;
    --green-700: #245c43;
    --green-600: #2e7d52;
    --green-500: #38a169;
    --green-400: #48bb78;
    --green-300: #68d391;
    --green-100: #e6f7ef;
    --green-50:  #f0faf5;

    --accent:     #d4a843;
    --accent-light: #f0d485;

    --gray-900: #1a1f2e;
    --gray-700: #374151;
    --gray-500: #6b7280;
    --gray-300: #d1d5db;
    --gray-100: #f3f4f6;
    --gray-50:  #f9fafb;

    --white: #ffffff;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(26,58,46,0.08), 0 1px 2px rgba(26,58,46,0.06);
    --shadow-md: 0 4px 12px rgba(26,58,46,0.12), 0 2px 6px rgba(26,58,46,0.08);
    --shadow-lg: 0 10px 30px rgba(26,58,46,0.15), 0 4px 10px rgba(26,58,46,0.10);
    --shadow-focus: 0 0 0 3px rgba(56,161,105,0.25);

    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Wrapper tổng thể ── */
.wat-translator-wrapper {
    max-width: 1100px;
    margin: 32px auto;
    font-family: 'DM Sans', 'Segoe UI', sans-serif;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
}

/* Đường viền gradient trên cùng */
.wat-translator-wrapper::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--green-500), var(--accent), var(--green-400));
    z-index: 10;
}

/* ── Branding / Tiêu đề nhỏ (tùy chọn) ── */
.wat-translator-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px 0;
    font-size: 13px;
    font-weight: 600;
    color: var(--green-700);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.wat-translator-brand svg {
    width: 18px; height: 18px;
    fill: var(--green-500);
}

/* ── Header chọn ngôn ngữ ── */
.wat-translator-header {
    display: flex;
    align-items: stretch;
    padding: 0 8px;
    background: var(--green-50);
    border-bottom: 1px solid var(--green-100);
    min-height: 52px;
    gap: 4px;
    overflow: visible; /* quan trọng: cho dropdown hiện ra ngoài */
}

.wat-lang-group {
    display: flex;
    align-items: stretch;
    flex: 1;
    /* KHÔNG overflow-x: auto nữa — nút sẽ vừa đủ */
    min-width: 0;
}

 

/* ── Nút ngôn ngữ ── */
.wat-lang-btn {
    background: none;
    border: none;
    padding: 0 12px;
    height: 52px;
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    font-size: 13px;
    color: var(--gray-500);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    transition: color var(--transition), border-color var(--transition), background var(--transition);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    flex-shrink: 0;
}

.wat-lang-btn:hover {
    background: var(--green-100);
    color: var(--green-700);
}

.wat-lang-btn.active {
    color: var(--green-700);
    font-weight: 600;
    border-bottom-color: var(--green-500);
    background: var(--white);
}

/* ── Wrapper nút "Thêm" + Dropdown ── */
.wat-lang-more-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.wat-lang-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    background: none;
    border: none;
    padding: 0 10px;
    height: 52px;
    font-family: 'DM Sans', sans-serif;
    font-size: 12.5px;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    transition: color var(--transition), background var(--transition);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.wat-lang-more-btn svg {
    width: 14px; height: 14px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}
.wat-lang-more-btn:hover,
.wat-lang-more-wrapper.open .wat-lang-more-btn {
    background: var(--green-100);
    color: var(--green-700);
}
.wat-lang-more-wrapper.open .wat-lang-more-btn svg {
    transform: rotate(180deg);
}

/* ── Dropdown menu ── */
.wat-lang-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 2px);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 190px;
    z-index: 9999;
    padding: 6px 0;
    max-height: 320px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--green-300) transparent;
}
.wat-lang-dropdown::-webkit-scrollbar { width: 4px; }
.wat-lang-dropdown::-webkit-scrollbar-thumb { background: var(--green-300); border-radius: 4px; }

/* Căn phải cho nhóm target */
.target-more .wat-lang-dropdown {
    right: 0;
    left: auto;
}
/* Căn trái cho nhóm source */
.source-more .wat-lang-dropdown {
    left: 0;
    right: auto;
}

.wat-lang-more-wrapper.open .wat-lang-dropdown {
    display: block;
    animation: dropdownFadeIn 0.15s ease forwards;
}

@keyframes dropdownFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.wat-dropdown-section-title {
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--gray-500);
    padding: 8px 14px 4px;
}
.wat-dropdown-section-title:not(:first-child) {
    border-top: 1px solid var(--gray-100);
    margin-top: 4px;
}

.wat-dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 14px;
    background: none;
    border: none;
    font-family: 'DM Sans', sans-serif;
    font-size: 13.5px;
    color: var(--gray-700);
    cursor: pointer;
    text-align: left;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
}
.wat-dropdown-item:hover {
    background: var(--green-50);
    color: var(--green-700);
}
.wat-dropdown-item.active {
    background: var(--green-100);
    color: var(--green-700);
    font-weight: 600;
}

/* Tên ngôn ngữ đang chọn từ dropdown hiện trên tab ngoài */
.wat-lang-btn.from-dropdown {
    display: inline-flex;
    align-items: center;
}

/* ── Nút hoán đổi ── */
.wat-swap-btn {
    flex-shrink: 0;
    background: var(--white);
    border: 1.5px solid var(--green-300);
    cursor: pointer;
    padding: 0;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform 0.15s;
    box-shadow: var(--shadow-sm);
}
.wat-swap-btn svg {
    width: 18px;
    height: 18px;
    fill: var(--green-600);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.wat-swap-btn:hover {
    background: var(--green-100);
    border-color: var(--green-500);
    box-shadow: var(--shadow-md);
}
.wat-swap-btn:hover svg {
    transform: rotate(180deg);
}
.wat-swap-btn:active {
    transform: scale(0.92);
    background: var(--green-100);
}

/* ── Body: 2 cột ── */
.wat-translator-body {
    display: flex;
    min-height: 220px;
}

.wat-box {
    flex: 1;
    padding: 20px 24px 16px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.source-box {
    border-right: 1px solid var(--gray-300);
    background: var(--white);
}

.target-box {
    background: var(--green-50);
}

/* ── Textarea nguồn ── */
#wat-source-text {
    width: 100%;
    flex: 1;
    border: none;
    resize: none;
    font-family: 'DM Sans', sans-serif;
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-900);
    outline: none;
    background: transparent;
    min-height: 160px;
    caret-color: var(--green-500);
}

#wat-source-text::placeholder {
    color: var(--gray-300);
    font-style: italic;
}

/* ── Kết quả dịch ── */
.wat-result-content {
    font-family: 'DM Sans', sans-serif;
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-700);
    min-height: 160px;
    white-space: pre-wrap;
    flex: 1;
}

/* ── Footer mỗi box ── */
.wat-box-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--gray-100);
    flex-wrap: wrap;
    gap: 8px;
}

#wat-char-count {
    font-size: 12px;
    color: var(--gray-500);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}

/* ── Nút hành động ── */
.wat-action-buttons {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.wat-primary-btn,
.wat-ai-btn {
    padding: 9px 22px;
    border-radius: var(--radius-md);
    border: none;
    font-family: 'DM Sans', sans-serif;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: background var(--transition), transform 0.15s, box-shadow var(--transition);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

/* Ripple effect */
.wat-primary-btn::after,
.wat-ai-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background 0.2s;
}
.wat-primary-btn:active::after,
.wat-ai-btn:active::after {
    background: rgba(255,255,255,0.15);
}

.wat-primary-btn {
    background: linear-gradient(135deg, var(--green-600) 0%, var(--green-500) 100%);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(56,161,105,0.35);
}
.wat-primary-btn:hover {
    background: linear-gradient(135deg, var(--green-700) 0%, var(--green-600) 100%);
    box-shadow: 0 4px 14px rgba(56,161,105,0.45);
    transform: translateY(-1px);
}
.wat-primary-btn:active { transform: translateY(0); }

/* AI button — gold accent */
.wat-ai-btn {
    background: linear-gradient(135deg, #b8842e 0%, var(--accent) 100%);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(212,168,67,0.35);
}
.wat-ai-btn:hover {
    background: linear-gradient(135deg, #9e7025 0%, #c49a35 100%);
    box-shadow: 0 4px 14px rgba(212,168,67,0.45);
    transform: translateY(-1px);
}
.wat-ai-btn:active { transform: translateY(0); }

/* ── AI Wrapper + Quota ── */
.wat-ai-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.wat-quota-info {
    font-size: 11px;
    color: var(--gray-500);
    text-align: center;
    line-height: 1;
}
.wat-quota-info #wat-ai-remaining {
    font-weight: 600;
    color: var(--green-600);
}

/* ── Loading ── */
#wat-loading {
    display: none;
    align-items: center;
    gap: 8px;
    color: var(--green-600);
    font-size: 13px;
    font-weight: 500;
}

.wat-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--green-100);
    border-radius: 50%;
    border-top-color: var(--green-500);
    animation: watSpin 0.8s linear infinite;
    flex-shrink: 0;
}

@keyframes watSpin { to { transform: rotate(360deg); } }

/* ── Message area ── */
#wat-message-area {
    padding: 0 24px 14px;
    min-height: 0;
    transition: all var(--transition);
}

#wat-message-area:empty { padding: 0; }

#wat-message-area span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fff5f5;
    border: 1px solid #fed7d7;
    color: #c53030;
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 500;
}

/* ── Pinyin (Chữ Hán + âm) ── */
.wat-result-display {
    line-height: 3.2;
    text-align: left;
    white-space: normal;
    word-break: break-word;
    display: block;
}

ruby {
    display: inline-flex;
    flex-direction: column-reverse;
    align-items: center;
    vertical-align: bottom;
    cursor: default;
}

rt.wat-pinyin-rt {
    display: block;
    line-height: 1;
    margin-bottom: 4px;
    font-size: 10.5px;
    color: var(--accent);
    font-family: 'DM Sans', Arial, sans-serif;
    font-weight: 600;
    text-align: center;
    letter-spacing: 0.03em;
}

.wat-chinese-char {
    display: block;
    line-height: 1.2;
    font-family: 'Noto Serif SC', 'STSong', serif;
    font-size: 20px;
    color: var(--gray-900);
    font-weight: 600;
}

/* Dấu câu, ký tự thường */
.wat-pinyin-raw {
    font-family: 'DM Sans', sans-serif;
    font-size: 18px;
    color: var(--gray-500);
}

#wat-target-text {
    transition: opacity 0.3s ease, transform 0.3s ease;
    min-height: 40px;
}

/* ── Pinyin item animation ── */
.wat-pinyin-item {
    display: inline-flex;
    flex-direction: column;
    vertical-align: bottom;
    animation: watFadeIn 0.4s ease forwards;
}

@keyframes watFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Nút Copy & icon ── */
.wat-result-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    border-top: 1px solid var(--gray-100);
    padding-top: 10px;
}

.wat-icon-btn {
    background: none;
    border: 1.5px solid transparent;
    color: var(--gray-500);
    cursor: pointer;
    padding: 7px 10px;
    border-radius: var(--radius-md);
    position: relative;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    font-size: 13px;
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
}

.wat-icon-btn:hover {
    background: var(--green-100);
    color: var(--green-700);
    border-color: var(--green-300);
}

.wat-icon-btn .dashicons {
    font-size: 17px;
    width: 17px;
    height: 17px;
    line-height: 1;
}

/* Tooltip "Đã chép!" */
.wat-copy-feedback {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: var(--green-800);
    color: var(--white);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 11.5px;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none;
}

/* Mũi tên nhỏ */
.wat-copy-feedback::after {
    content: '';
    position: absolute;
    top: 100%; left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--green-800);
}

.wat-icon-btn.copied .wat-copy-feedback {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ── Divider giữa 2 cột trên mobile ── */
.wat-divider {
    display: none;
    height: 1px;
    background: var(--gray-300);
    margin: 0 24px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .wat-translator-wrapper {
        margin: 20px auto; /* Căn lề vừa phải */
        border-radius: var(--radius-lg);
    }

    /* Header: Chuyển sang chế độ Flex đơn giản */
    .wat-translator-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 4px; 
        height: 56px;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
    }

    /* Căn giữa nhóm ngôn ngữ */
    .wat-lang-group {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center; /* Luôn căn giữa cụm chữ và mũi tên */
        min-width: 0;
        gap: 0; 
        overflow: visible !important; 
    }

    /* ẨN tất cả các nút ngôn ngữ KHÔNG active */
    .wat-lang-btn:not(.active) {
        display: none !important;
    }

    /* CHỈ HIỆN nút Active - Style giống Text hiển thị */
    .wat-lang-btn.active {
        display: flex !important;
        align-items: center;
        justify-content: flex-end;
        width: auto;
        padding: 0 2px 0 0; /* Dính sát vào mũi tên */
        border-bottom: none; 
        font-weight: 700;
        color: var(--green-700);
        font-size: 15px; /* Font to rõ cho Tablet */
        background: transparent;
        max-width: 140px; 
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
    }
    
    /* Wrapper nút Mũi tên */
    .wat-lang-more-wrapper {
        flex: 0 0 auto;
        display: flex;
        align-items: center;
    }

    /* Nút mũi tên - Cố định kích thước */
    .wat-lang-more-btn {
        padding: 0 4px 0 0;
        height: 56px;
        border-bottom: none;
        width: 24px; /* Cố định chiều rộng */
        justify-content: center;
    }
    
    /* Icon mũi tên */
    .wat-lang-more-btn svg {
        width: 12px; 
        height: 12px;
        color: var(--green-700); /* Đồng màu với chữ */
        margin-top: 2px;
        font-weight: bold;
    }
    
    /* Ẩn chữ "Thêm" */
    .wat-more-label { display: none; } 

    /* Nút Hoán đổi (Swap) */
    .wat-swap-btn {
        flex: 0 0 auto;
        width: 36px; 
        height: 36px;
        margin: 0 6px;
        border: 1px solid var(--gray-200);
        background: var(--gray-50);
        box-shadow: none;
        color: var(--gray-500);
    }

    /* Dropdown dạng Bottom Sheet (Trượt từ dưới lên) */
    .wat-lang-dropdown {
        position: fixed;
        top: auto; bottom: 0; left: 0; right: 0;
        width: 100%;
        max-height: 60vh;
        border-radius: 16px 16px 0 0;
        box-shadow: 0 -10px 40px rgba(0,0,0,0.2);
        z-index: 10000;
        padding: 10px 0;
        animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        border: none;
    }

    @keyframes slideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }

    .wat-dropdown-item {
        padding: 14px 24px;
        font-size: 16px;
        border-bottom: 1px solid var(--gray-50);
    }
    .wat-dropdown-section-title {
        padding: 10px 24px 5px;
        font-size: 13px;
        background: var(--white);
        color: var(--gray-400);
    }
}


@media (max-width: 768px) {
    .wat-translator-wrapper {
        margin: 10px;
    }

    /* Chuyển body thành cột dọc */
    .wat-translator-body { flex-direction: column; }
    
    .source-box { 
        border-right: none; 
        border-bottom: 1px solid var(--gray-200); 
        padding: 16px; 
        min-height: auto;
    }
    
    .target-box { 
        padding: 16px; 
        background: var(--gray-50); 
        min-height: auto;
    }
    
    /* Font size input/output lớn hơn trên mobile để dễ đọc */
    #wat-source-text, .wat-result-content { 
        font-size: 17px; 
        min-height: 100px; 
    }
    
    .wat-quota-info { display: none; }
}

/* ── TRƯỜNG HỢP 3: Điện thoại siêu nhỏ (iPhone SE, Galaxy Fold...) ── */
@media (max-width: 360px) {
    .wat-lang-btn.active {
        font-size: 13px;  
        max-width: 90px;
    }
    .wat-swap-btn {
        width: 28px; height: 28px;
        margin: 0 4px;
    }
    .wat-action-buttons {
        width: 100%;
        justify-content: space-between;
    }
    .wat-primary-btn, .wat-ai-btn {
        padding: 8px 12px;
        font-size: 12px;
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .wat-action-buttons {
        flex-wrap: wrap;
    }

    .wat-box-footer {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ── Focus accessibility ── */
.wat-lang-btn:focus-visible,
.wat-swap-btn:focus-visible,
.wat-primary-btn:focus-visible,
.wat-ai-btn:focus-visible,
.wat-icon-btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

#wat-source-text:focus {
    box-shadow: none;
}

/* ── Hiệu ứng loading mờ ── */
.wat-result-content.is-loading {
    opacity: 0.5;
    pointer-events: none;
}