body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans CJK JP', sans-serif;
    background-color: var(--firstback);
    color: var(--maintext);
    margin: 0;
    min-height: 100vh;
}

.container {
    width: min(100% - 40px, var(--width-l));
    margin: 60px auto;
    box-sizing: border-box;

    h1 {
        color: var(--maintext);
        margin-bottom: 30px;
        font-weight: 600;
    }
}

.file-drop-area {
    border: 2px dashed var(--sixthback);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
    background-color: var(--secondback);
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;

    &:hover {
        background-color: var(--thirdback);
        border-color: var(--themecolor);
    }

    p {
        color: var(--subtext);
        margin: 0;
    }
}

.main-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.settings-panel {
    width: 380px;
    flex-shrink: 0;

    .setting-group {
        margin-bottom: 20px;
        padding: 15px;
        border-radius: 20px;
        background-color: var(--secondback);

        &>summary,
        &>h3 {
            position: sticky;
            top: 60px;
            margin-top: 0;
            font-size: 16px;
            font-weight: 700;
            width: fit-content;
            padding: 5px 10px;
            margin: -10px;
            border-radius: 10px;
            background: var(--secondback);
            color: var(--maintext);
            z-index: 99;
        }
    }

    details {
        margin-top: 15px;
        padding-top: 15px;

        &.setting-group>summary {
            cursor: pointer;
            list-style: none;

            &::-webkit-details-marker {
                display: none;
            }

            h3 {
                margin-bottom: 0;
                display: inline-block;
            }
        }

        summary {
            cursor: pointer;
            font-weight: 700;
            color: var(--url);

            &::marker {
                transition: .2s;
            }
        }
    }

    .sub-options {
        padding: 15px 0 10px 15px;
        margin: 0 0 0 7px;
        border-left: 3px solid var(--fifthback);
        border-radius: 0 8px 8px 0;

        &>label {
            margin: 0;
        }
    }

    .radio-group,
    .color-options {
        display: flex;
        gap: 10px;
        margin-bottom: 10px;
        align-items: center;
    }

    #bgColorPicker {
        padding: 0;
        height: 30px;
        width: 50px;
        border: 1px solid var(--line);
        border-radius: 4px;
        cursor: pointer;
    }
}

.preview-area {
    flex-grow: 1;
    position: sticky;
    top: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--fifthback);
    min-height: 400px;
    max-height: calc(100vh - 60px);
    border-radius: 20px;
    border: 1px solid var(--line);
    padding: 20px;
    z-index: 100;

    canvas {
        max-width: 100%;
        max-height: calc(100vh - 110px);
        object-fit: contain;
    }

    .resolution-display {
        position: absolute;
        bottom: 5px;
        right: 5px;
        background-color: rgba(0, 0, 0, 0.6);
        color: white;
        padding: 3px 8px;
        border-radius: 15px;
        font-size: 12px;
        font-family: monospace;
    }
}

.settings-panel label {
    display: block;
    margin: 15px 0 0;
    font-weight: 500;
    font-size: 14px;
    color: var(--subtext);

    &.aspect-ratio-lock,
    .radio-group &,
    .color-options & {
        display: flex;
        align-items: center;
        font-weight: normal;
        color: var(--maintext);
    }
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    border: none;
    outline: 2px solid #0000;
    font-size: 16px;
    height: 40px;
    outline-offset: 6px;
    border-radius: 10px;
    margin: 5px 0 0;
    background-color: var(--thirdback);
    color: var(--maintext);
    font-family: var(--font-family);
    transition: 0.3s;

    &:focus {
        outline: 2px solid var(--themecolor);
        outline-offset: 2px;
        background: var(--fourthback);
    }
}

input[type="number"] {
    width: min(100%, 80px);
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    background: var(--fourthback);
    outline: none;
    border-radius: 4px;
    margin: 5px 0 15px;
    transition: .2s;

    &::-webkit-slider-thumb {
        -webkit-appearance: none;
        appearance: none;
        width: 20px;
        height: 20px;
        background: var(--themecolor);
        cursor: pointer;
        border-radius: 50%;
        border: 3px solid var(--secondback);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
        transition: 1s;
    }

    &::-moz-range-thumb {
        width: 20px;
        height: 20px;
        background: var(--themecolor);
        cursor: pointer;
        border-radius: 50%;
        border: 3px solid var(--secondback);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    }

    &:active {
        background: var(--thirdtext);

        &::-webkit-slider-thumb {
            transform: scale(1.5);
            background: var(--accentcolor);
            transition: .2s;
        }
    }
}

input[type="checkbox"],
input[type="radio"] {
    accent-color: var(--themecolor);
    width: 1.2em;
    height: 1.2em;
    margin-right: 8px;
}

.resolution-setting {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

#downloadBtn {
    width: 100%;
    padding: 15px;
    margin: 0 0 15px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    background-color: var(--btn);
    color: var(--btntext);
    border: none;
    border-radius: 10px;
    transition: background-color 0.3s, opacity 0.3s, filter .5s ease-out;

    &:disabled {
        background-color: var(--sixthback);
        cursor: not-allowed;
        opacity: 0.7;
    }

    &:not(:disabled):hover {
        background-color: var(--btnhover);
        filter: drop-shadow(0 0 10px var(--btnhover));
    }
}

label.checkbox {
    cursor: pointer;
    padding: 5px 10px 5px 35px;
    margin: 5px 0 0;
    color: var(--maintext);
    background: var(--thirdback);
    font-size: 14px;
    border-radius: 10px;
    width: fit-content;
    position: relative;
    transition: .2s;

    &:active {
        transform: scale(.95);
    }

    &::before {
        position: absolute;
        content: "";
        top: 6px;
        left: 6px;
        width: 16px;
        height: 16px;
        border-radius: 5px;
        border: 2px solid var(--subtext);
        transition: .2s;
    }

    &:has(input:checked)::before {
        border: 2px solid #0000;
        border-top: 2px solid var(--themecolor);
        border-right: 2px solid var(--themecolor);
        border-radius: 0;
        height: 6px;
        top: 7px;
        left: 7px;
        transform: rotate(-225deg);
    }

    input {
        display: none;
    }
}

label.radio {
    background: var(--thirdback);
    padding: 5px 10px;
    margin: 5px 0 0;
    width: fit-content;
    cursor: pointer;
    border-radius: 10px;
    position: relative;
    color: var(--maintext);
    outline: 2px solid #0000;
    outline-offset: 6px;
    transition: .2s;

    &:hover {
        background: var(--fourthback);
        outline: 2px solid var(--thirdtext);
        outline-offset: 2px;
    }

    &:active {
        transform: scale(.95);
        outline: 2px solid var(--accentcolor);
        outline-offset: 2px;
    }

    &::before {
        position: absolute;
        content: "";
        top: 10px;
        left: 6px;
        width: 16px;
        height: 6px;
        border-top: 2px solid #0000;
        border-right: 2px solid #0000;
        transition: .2s;
    }

    &:has(input:checked) {
        padding: 5px 10px 5px 30px;
        outline: 2px solid var(--themecolor);
        outline-offset: 0;

        &:hover {
            outline-offset: 2px;
        }

        &:active {
            transform: scale(.95);
            outline: 2px solid var(--accentcolor);
            outline-offset: 2px;
        }

        &::before {
            border-top: 2px solid var(--maintext);
            border-right: 2px solid var(--maintext);
            top: 9px;
            left: 10px;
            transform: rotate(-225deg);
        }
    }

    input {
        display: none;
    }
}

@media (max-width: 1000px) {
    .main-content {
        flex-direction: column;
        align-items: flex-end;
    }

    .settings-panel {
        width: 100%;
    }

    .preview-area {
        max-height: 50vh;
        padding: 10px;
        min-height: auto;

        canvas {
            max-height: calc(50vh - 20px);
        }
    }
}

@media (min-width: 1000px) {
    .main-content {
        flex-direction: row-reverse;
    }
}

.preset-list {
    margin-bottom: 15px;
    max-height: 200px;
    overflow-y: auto;
}

.preset-item {
    display: flex;
    align-items: center;
    padding: 8px 15px;
    border-radius: 10px;
    margin-bottom: 5px;
    background-color: var(--thirdback);
    transition: background-color 0.2s;

    &:hover {
        background-color: var(--fifthback);
    }

    span {
        flex-grow: 1;
        font-weight: 500;
        cursor: pointer;
    }

    .actions {
        position: relative;
    }

    .menu-btn {
        background: none;
        border: none;
        cursor: pointer;
        font-size: 16px;
        color: var(--subtext);
        padding: 5px 8px;
        border-radius: 4px;

        &:hover {
            background-color: var(--fourthback);
        }
    }
}

.preset-menu {
    position: absolute;
    right: 0;
    top: 100%;
    background-color: var(--secondback);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 5px;
    z-index: 30;
    transform: scale(1);
    display: none;

    button {
        display: block;
        width: 100%;
        text-align: left;
        background: none;
        border: none;
        padding: 8px 12px;
        cursor: pointer;
        border-radius: 4px;
        font-size: 14px;
        white-space: nowrap;

        &:hover {
            background-color: var(--thirdback);
        }

        &.delete {
            color: #ff3b30;
        }
    }
}

.preset-note {
    font-size: 12px;
    color: var(--thirdtext);
    margin-top: 10px;
    margin-bottom: 0;
}

.fine-tune-container {
    margin-top: 15px;
}

.fine-tune-group {
    border-top: 1px solid var(--fourthback);
    padding-top: 15px;
    margin-top: 15px;

    &:first-child {
        border-top: none;
        padding-top: 0;
        margin-top: 0;
    }

    h4 {
        margin: 0 0 10px 0;
        font-size: 14px;
        font-weight: 600;
    }
}

.fine-tune-control {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;

    label {
        width: 20px;
        flex-shrink: 0;
        text-align: center;
        color: var(--subtext);
        margin-bottom: 0;
    }

    input[type="range"] {
        margin: 0;
    }
}

.fine-tune-value {
    width: 60px;
    padding: 5px;
    text-align: center;
}

#renameConfirmBtn,
#savePresetConfirmBtn {
    border: none;
    border-radius: 10px;
    background: var(--btn);
    color: var(--btntext);
    cursor: pointer;
    transition: .3s;

    &:hover {
        background: var(--btnhover);
    }
}

.secondary-btn {
    width: 100%;
    padding: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    background-color: var(--fourthback);
    color: var(--subtext);
    border: none;
    border-radius: 10px;
    transition: background-color 0.3s, color 0.3s;
    margin-top: 10px;

    &:hover {
        background-color: var(--sixthback);
        color: var(--maintext);
    }
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--secondback);
    padding: 15px;
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 400px;

    h4 {
        margin-top: 0;
    }
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;

    button {
        padding: 10px 20px;
    }

    .secondary-btn {
        width: auto;
        margin-top: 0;
    }
}

.explain {
    font-size: 12px;
    color: var(--thirdtext);
    margin: 5px 0 0;
    transition: 1s;

    &:hover {
        color: var(--help);
        filter: drop-shadow(0 0 10px var(--help));
    }
}