/* ===== CSS Reset & Variables ===== */
:root {
    --bg: #F1F2F3;
    --card-bg: #FFFFFF;
    --text-main: #2A2B2E;
    --text-secondary: #6A6B6D;
    --text-auxiliary: #9B9FA8;
    --text-weak: #C1C6CF;
    --border-color: #D5D5D5;
    --primary-color: #0055CD;
    --primary-hover: #0469F7;
    --error-color: #0055CD;
    --success-color: #15803D;
    --warning-color: #FA9010;
    --link-color: #0175E8;
    --disabled-color: #E5E5E5;
    --divider-color: #E3E5E6;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius-md: 4px;
    --radius-lg: 8px;
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 14px;
    font-weight: 400;
}

/* ===== Header ===== */
.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--divider-color);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    height: 80px;
}

.header-inner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.logo {
    width: 120px;
    height: auto;
    display: block;
}

.back-home {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 400;
    transition: var(--transition);
    white-space: nowrap;
}

.back-home:hover {
    color: var(--primary-hover);
}

.back-arrow {
    width: 16px;
    height: 16px;
}


/* ===== Main Container ===== */
.main-container {
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    flex: 1;
    padding: 60px 0;
}

.form-card {
    background: var(--card-bg);
    border-radius: 0;
    padding: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h1 {
    font-size: 36px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 20px;
}

.form-header p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

.field-meta {
    margin-top: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.field-tip,
.field-counter {
    font-size: 12px;
    color: var(--text-auxiliary);
}

.field-counter.is-limit {
    color: var(--warning-color);
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: 20px;
    position: relative;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 400;
    color: var(--text-main);
    margin-bottom: 8px;
}

.required-mark {
    color: #E60039;
}

.form-control {
    width: 100%;
    padding: 11px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-main);
    background: var(--card-bg);
    transition: var(--transition);
    font-family: inherit;
}

.form-control::placeholder {
    color: var(--text-auxiliary);
}

.form-control:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 2px rgba(1, 117, 232, 0.1);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* ===== Feedback Type Selector ===== */
.type-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.type-option {
    cursor: pointer;
}

.type-option input[type="radio"] {
    display: none;
}

.type-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    background: var(--card-bg);
}

.type-card .type-icon {
    width: 32px;
    height: 32px;
}

.type-card .type-icon svg {
    width: 100%;
    height: 100%;
}

.help-icon {
    width: 32px;
    height: 32px;
    display: block;
    filter: grayscale(100%) opacity(0.5);
    transition: filter 0.2s ease;
}

.type-option input[type="radio"]:checked + .type-card .help-icon,
.type-option:hover .type-card .help-icon {
    filter: none;
}

.type-card .type-label {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-main);
}

.type-option input[type="radio"]:checked+.type-card {
    border-color: var(--link-color);
    background: rgba(1, 117, 232, 0.05);
}

.type-option:hover .type-card {
    border-color: var(--link-color);
}

/* ===== Upload Area ===== */
.upload-area {
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: #FAFBFC;
}

.upload-area:hover {
    border-color: var(--link-color);
    background: rgba(1, 117, 232, 0.02);
}

.upload-area.dragover {
    border-color: var(--link-color);
    background: rgba(1, 117, 232, 0.05);
}

.upload-icon {
    width: 60px;
    height: 60px;
    display: block;
    margin: 0 auto;
}

.upload-text {
    margin-top: 8px;
    font-size: 14px;
    font-weight: 400;
    color: var(--text-main);
}

.upload-hint {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-auxiliary);
    font-weight: 400;
}

/* ===== File Preview Container ===== */
.file-preview-container {
    margin-top: 12px;
}

.file-preview-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #F7F9FA;
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin-bottom: 8px;
}

.file-preview-box:last-child {
    margin-bottom: 0;
}

.file-preview-name {
    font-size: 14px;
    color: var(--link-color);
    font-weight: 400;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex-grow: 1;
}

.file-preview-size {
    font-size: 14px;
    color: var(--text-auxiliary);
    font-weight: 400;
    margin-right: 20px;
    flex-shrink: 0;
}

.file-preview-delete {
    cursor: pointer;
    color: var(--text-auxiliary);
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.file-preview-delete:hover {
    color: var(--error-color);
}

/* ===== Upload Progress Bar ===== */
.upload-progress {
    display: none;
    margin-top: 12px;
    margin-bottom: 8px;
}

.upload-progress.show {
    display: block;
}

.progress-bar-container {
    height: 4px;
    background-color: #E3E5E6;
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--link-color);
    border-radius: 2px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.progress-bar-fill.warning {
    background-color: var(--warning-color);
}

.progress-text {
    font-size: 12px;
    color: var(--text-auxiliary);
    margin-top: 4px;
    text-align: right;
}
.submit-btn {
    width: auto;
    padding: 11px 32px;
    background-color: var(--primary-color);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 400;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 40px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

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

.submit-btn:disabled {
    background-color: var(--disabled-color);
    color: #FFFFFF;
    cursor: not-allowed;
}

/* ===== Upload Toast Notification ===== */
.upload-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1000;
    display: none;
    align-items: center;
    background-color: #fce5eb;
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    font-size: 14px;
    color: var(--text-main);
    box-shadow: 0 4px 12px 0 rgba(230, 0, 57, 0.15);
    min-width: unset;
    max-width: 400px;
    width: fit-content;
}

.upload-toast.show {
    display: flex;
}

.toast-icon {
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 8px;
    flex-shrink: 0;
}

.toast-icon svg {
    width: 12px;
    height: 12px;
    stroke: #FFFFFF;
    stroke-width: 2;
}

.toast-message {
    white-space: nowrap;
}

.toast-close {
    cursor: pointer;
    color: var(--text-auxiliary);
    margin-left: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.toast-close:hover {
    color: var(--text-secondary);
}

/* ===== Success Page ===== */
.success-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    max-width: 520px;
    margin: 0 auto;
    text-align: center;
}

.success-icon {
    width: 64px;
    height: 64px;
    background-color: var(--success-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.success-icon svg {
    width: 32px;
    height: 32px;
    stroke: #FFFFFF;
    stroke-width: 2;
}

.success-title {
    font-size: 36px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 16px;
    line-height: 1.2;
}

.success-message {
    font-size: 14px;
    color: var(--text-auxiliary);
    line-height: 1.5;
    margin-bottom: 32px;
}

.success-message p {
    margin: 0;
}

.success-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn {
    display: block;
    padding: 11px 24px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 400;
    text-decoration: none;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border: none;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: #F7F9FA;
    color: var(--text-main);
    border: none;
}

.btn-secondary:hover {
    background-color: #F1F3F5;
}
.form-group.error .form-control {
    border-color: var(--error-color);
}

.form-group.error .type-selector .type-card {
    border-color: var(--error-color);
}

.form-group.error .upload-area {
    border-color: var(--error-color);
}

.form-group.error .privacy-label input[type="checkbox"] {
    outline: 1px solid var(--error-color);
    outline-offset: 2px;
}

.error-message {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 6px;
    display: none;
    align-items: center;
    gap: 4px;
    font-weight: 400;
}

.form-group.error .error-message {
    display: flex;
}

.error-icon {
    width: 14px;
    height: 14px;
    fill: var(--error-color);
}

/* ===== Privacy Label ===== */
.privacy-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

.privacy-label input[type="checkbox"] {
    margin-top: 3px;
    accent-color: var(--primary-color);
}

.privacy-label input[type="checkbox"]:hover {
    accent-color: var(--primary-color);
}

.privacy-label input[type="checkbox"]:checked {
    accent-color: var(--primary-color);
}

.privacy-label input[type="checkbox"]:checked:hover {
    accent-color: var(--primary-color);
}

.privacy-text {
    line-height: 1.5;
}

.privacy-link {
    color: var(--text-main);
    text-decoration: underline;
}

.privacy-link:hover {
    color: var(--primary-color);
}

@media (max-width: 767px) {
    .header {
        height: auto;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        gap: 12px;
        padding: 20px;
    }

    .main-container {
        padding: 24px 16px 40px;
    }

    .form-card,
    .success-card {
        padding: 24px 20px;
    }

    .form-header h1,
    .success-title {
        font-size: 28px;
    }

    .type-selector {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .field-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===== Pre-defined Error Popup (not used in current logic) ===== */
.error-popup {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: none;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-main);
}

.error-popup.show {
    display: flex;
}

.error-popup .icon {
    width: 16px;
    height: 16px;
    fill: var(--error-color);
}

.error-popup .text {
    margin: 0;
}



@media (max-width: 1000px) {
    .main-container {
        padding: 20px;
    }
    
    .form-card {
        padding: 20px;
    }
}

@media (max-width: 600px) {
    .header {
        height: 60px;
    }

    .header-inner {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        height: 100%;
        padding: 0 16px;
    }

    .logo {
        width: 80px;
    }

    .back-home {
        font-size: 14px;
    }

    .form-header h1 {
        font-size: 24px;
        font-weight: 400;
    }

    .type-selector {
        grid-template-columns: 1fr 1fr;
    }
    
    .main-container {
        padding: 20px;
    }
    
    .submit-btn {
        width: 100%;
    }
}