/* --- Google Fonts --- */
:root {
    font-family: 'Noto Sans TC', sans-serif;
}

/* --- MD3 Color Palette (Light Theme) --- */
:root {
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #F9DEDC;
    --md-sys-color-on-error-container: #410E0B;
    --md-sys-color-background: #FFFBFE;
    --md-sys-color-on-background: #1C1B1F;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-shadow: #000000;
    --md-sys-color-surface-container-highest: #F3EDF7;
}

/* --- MD3 Color Palette (Dark Theme) --- */
.dark-mode {
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;
    --md-sys-color-secondary: #CCC2DC;
    --md-sys-color-on-secondary: #332D41;
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;
    --md-sys-color-tertiary: #EFB8C8;
    --md-sys-color-on-tertiary: #492532;
    --md-sys-color-tertiary-container: #633B48;
    --md-sys-color-on-tertiary-container: #FFD8E4;
    --md-sys-color-error: #F2B8B5;
    --md-sys-color-on-error: #601410;
    --md-sys-color-error-container: #8C1D18;
    --md-sys-color-on-error-container: #F9DEDC;
    --md-sys-color-background: #1C1B1F;
    --md-sys-color-on-background: #E6E1E5;
    --md-sys-color-surface: #1C1B1F;
    --md-sys-color-on-surface: #E6E1E5;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-outline: #938F99;
    --md-sys-color-surface-container-highest: #2B2930;
}

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

html,
body {
    height: 100%;
}

body {
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

.main-container {
    max-width: 700px;
    margin: 24px auto;
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hidden {
    display: none !important;
}

/* --- Typography --- */
h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--md-sys-color-primary);
    margin-bottom: 4px;
}

.subtitle {
    font-size: 1rem;
    color: var(--md-sys-color-on-surface-variant);
}

h2 {
    font-size: 1.5rem;
    font-weight: 500;
}

h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 12px;
}

p {
    font-size: 1rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* --- Header --- */
header {
    position: relative;
    padding: 16px 0;
}

.header-actions {
    position: absolute;
    top: 16px;
    right: 0;
    display: flex;
    gap: 8px;
}

/* --- Card --- */
.card {
    background-color: var(--md-sys-color-surface-container-highest);
    border-radius: 12px;
    padding: 16px;
    transition: background-color 0.3s;
}

.card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

/* --- Buttons --- */
.button-filled,
.button-outlined,
.button-text,
.button-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 20px;
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.button-filled {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.button-filled:hover {
    box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.15);
}

.button-outlined {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-outline);
    padding: 9px 23px;
}

.button-outlined:hover {
    background-color: rgba(103, 80, 164, 0.08);
}

.dark-mode .button-outlined:hover {
    background-color: rgba(208, 188, 255, 0.08);
}

.button-text {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    padding: 10px 12px;
}

.button-icon {
    padding: 8px;
    border-radius: 50%;
    color: var(--md-sys-color-on-surface-variant);
    background-color: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

/* FIX for Icon contrast in dark mode */
.dark-mode .button-icon {
    color: var(--md-sys-color-on-surface);
}

.button-icon:hover {
    background-color: rgba(0, 0, 0, 0.08);
}

.dark-mode .button-icon:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- Segmented Button --- */
.segmented-button-container {
    display: flex;
    width: 100%;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: 20px;
    overflow: hidden;
}

.segmented-button-container input[type="radio"] {
    display: none;
}

.segmented-button-container label {
    flex: 1;
    padding: 8px 12px;
    text-align: center;
    color: var(--md-sys-color-on-surface);
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    font-size: 0.9rem;
    border-right: 1px solid var(--md-sys-color-outline);
}

.segmented-button-container label:last-of-type {
    border-right: none;
}

.segmented-button-container input:checked+label {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    font-weight: 700;
}

/* --- Input Field --- */
.input-field {
    position: relative;
    margin: 24px 0 16px;
}

.input-field input {
    width: 100%;
    padding: 16px 12px 8px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: 4px;
    background-color: transparent;
    color: var(--md-sys-color-on-surface);
    font-size: 1rem;
}

.input-field label {
    position: absolute;
    top: 12px;
    left: 12px;
    color: var(--md-sys-color-on-surface-variant);
    pointer-events: none;
    transition: all 0.2s;
}

.input-field input:focus+label,
.input-field input:not(:placeholder-shown)+label {
    top: -8px;
    left: 8px;
    font-size: 0.75rem;
    color: var(--md-sys-color-primary);
    background-color: var(--md-sys-color-surface-container-highest);
    padding: 0 4px;
}

.input-field input:focus {
    outline: 2px solid var(--md-sys-color-primary);
    border-color: transparent;
}

/* --- Upload Area --- */
.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px;
    border: 2px dashed var(--md-sys-color-outline);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.upload-area.drag-over {
    border-color: var(--md-sys-color-primary);
    background-color: var(--md-sys-color-primary-container);
}

.upload-area .material-symbols-outlined {
    font-size: 48px;
    color: var(--md-sys-color-primary);
}

.upload-area p {
    margin-top: 8px;
}

.upload-area p span {
    color: var(--md-sys-color-primary);
    font-weight: 500;
    text-decoration: underline;
}

.divider {
    text-align: center;
    color: var(--md-sys-color-on-surface-variant);
    margin: 16px 0;
}

/* --- Result & Loading --- */
.image-preview-container {
    width: 100%;
    max-height: 400px;
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

#result-image {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: 8px;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 32px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 5px solid var(--md-sys-color-primary-container);
    border-bottom-color: var(--md-sys-color-primary);
    border-radius: 50%;
    display: inline-block;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

#explanation {
    white-space: pre-wrap;
    line-height: 1.7;
}

/* --- Chip (for rating) --- */
.chip {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 8px;
    background-color: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
    font-size: 0.9rem;
    font-weight: 500;
}

/* --- Saved Results --- */
#saved-results-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.saved-result-card {
    background-color: var(--md-sys-color-surface-container-highest);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.saved-result-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.saved-result-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.saved-result-info {
    padding: 12px;
}

.saved-result-info h4 {
    font-size: 1rem;
    font-weight: 500;
}

.saved-result-info p {
    font-size: 0.8rem;
    color: var(--md-sys-color-on-surface-variant);
}

.saved-result-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 8px;
}

/* --- Popup --- */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0s 0.3s;
    padding: 16px;
}

.popup-overlay.visible {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s;
}

.popup-card {
    background-color: var(--md-sys-color-surface);
    border-radius: 28px;
    padding: 24px;
    max-width: 90vw;
    max-height: 90vh;
    width: 600px;
    overflow-y: auto;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s;
}

.popup-overlay.visible .popup-card {
    transform: scale(1);
}

.popup-card img {
    width: 100%;
    max-height: 40vh;
    object-fit: contain;
    border-radius: 16px;
    margin-bottom: 16px;
}

.close-popup {
    position: absolute;
    top: 12px;
    right: 12px;
}

/* --- Share Canvas (Hidden) --- */
#share-canvas-container {
    position: fixed;
    top: -9999px;
    left: -9999px;
    width: 500px;
    padding: 20px;
    background-color: #1C1B1F;
}

.share-card {
    background-color: #2B2930;
    color: #E6E1E5;
    border-radius: 16px;
    overflow: hidden;
    font-family: 'Noto Sans TC', sans-serif;
}

.share-card img {
    width: 100%;
    max-height: 50vh;
    object-fit: cover;
}

.share-content {
    padding: 20px;
}

.share-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.share-header h3 {
    font-size: 1.5rem;
    font-weight: 500;
    color: #E6E1E5;
}

.share-content p {
    font-size: 1rem;
    color: #CAC4D0;
    line-height: 1.6;
    white-space: pre-wrap;
}

.share-footer {
    padding: 12px 20px;
    background-color: rgba(0, 0, 0, 0.2);
    text-align: right;
}

.share-footer p {
    font-size: 0.8rem;
    color: #938F99;
}

#share-canvas-container .chip {
    background-color: #4F378B;
    color: #EADDFF;
}

/* --- Toast Notification Styles (FIXED) --- */
#toast-container {
    position: fixed;
    /* 增加一個安全區域邊距，使用 max() 確保它至少有 24px，
       並尊重 iOS 等設備的安全區域（env(safe-area-inset-bottom)） */
    bottom: max(24px, env(safe-area-inset-bottom));
    left: 16px;
    /* 從居中改為靠左，避免與其他 UI 衝突 */
    right: 16px;
    /* 增加 right，讓它在橫向有邊距 */
    transform: none;
    /* 移除 translateX(-50%) */
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    /* 讓 toast 本身居中 */
    gap: 12px;
    pointer-events: none;
    /* 確保在手機上也能正常顯示 */
    max-height: 100vh;
    overflow: hidden;
    /* 確保容器可見 */
    visibility: visible;
    opacity: 1;
}

.toast {
    max-width: 400px;
    width: fit-content;
    /* 讓寬度自適應內容，但有最大限制 */
    /* 其他樣式保持不變... */
    padding: 12px 18px;
    border-radius: 24px;
    background-color: var(--md-sys-color-on-background);
    color: var(--md-sys-color-background);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.35s cubic-bezier(0.21, 1.02, 0.73, 1);
    animation: toast-in 0.35s cubic-bezier(0.21, 1.02, 0.73, 1) forwards;
    /* 確保在手機上也能正常顯示 */
    word-wrap: break-word;
    white-space: normal;
    line-height: 1.4;
    /* 確保toast可見 */
    visibility: visible;
    display: block;
}

@keyframes toast-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast.fade-out {
    opacity: 0;
    transform: translateY(20px) scale(0.9);
}

/* --- Responsiveness --- */
@media (max-width: 600px) {
    .main-container {
        margin: 0;
        padding: 0 8px 16px 8px;
    }

    .segmented-button-container {
        flex-direction: column;
        border: none;
        border-radius: 0;
        gap: 8px;
    }

    .segmented-button-container label {
        border: 1px solid var(--md-sys-color-outline);
        border-radius: 20px !important;
    }

    .card-actions {
        flex-wrap: wrap;
    }

    #toast-container {
        /* 在手機上，讓容器佔滿寬度 */
        left: 8px;
        right: 8px;
        bottom: max(16px, env(safe-area-inset-bottom));
        /* 手機上底部間距可以小一點 */
        align-items: stretch;
        /* 讓 toast 佔滿容器寬度 */
        padding: 0 8px;
    }

    .toast {
        /* 在手機上，讓 toast 佔滿寬度 */
        width: 100%;
        max-width: none;
        text-align: center;
        /* 確保在手機上也能正常顯示 */
        font-size: 0.85rem;
        padding: 10px 16px;
    }
}